WO2021166589A1 - Deterioration diagnosis system, deterioration diagnosis method, program, and electric power system - Google Patents

Abstract

According to the present invention, deterioration in an electronic component is diagnosed from the circumstances of self heat emission. A deterioration diagnosis system (1) that diagnosis deterioration in an electric power conversion system (2). The electric power conversion system (2) is provided with a plurality of electronic components. The electric power conversion system (2) converts electric power to first electric power and/or second electric power. The deterioration diagnosis system (1) comprises a diagnosis unit (111). The diagnosis unit (111) diagnoses deterioration in at least some target components among the plurality of electronic components. The diagnosis unit (111), on the basis of temperature information, diagnoses deterioration with reference to self heat emission of the target components while the target components are being energized. The temperature information pertains to the result of measuring the temperature of the target components.

Description

Deterioration diagnosis system, deterioration diagnosis method, program, and power system

This disclosure generally relates to degradation diagnostic systems, degradation diagnostic methods, programs, and power systems. More specifically, the present disclosure relates to a deterioration diagnosis system, a deterioration diagnosis method, a program, and a power system for performing deterioration diagnosis of a power conversion system that converts power between a first power and a second power.

Patent Document 1 describes a deterioration diagnosis system (fault detection system) that detects a failure or deterioration of a power conversion system (inverter). In the deterioration diagnosis system described in Patent Document 1, deterioration of an electronic component is detected by increasing the thermal resistance of the electronic component (semiconductor module) due to a crack generated in the solder layer.

Japanese Unexamined Patent Publication No. 2003-134795

An object of the present disclosure is to provide a deterioration diagnosis system, a deterioration diagnosis method, a program, and an electric power system capable of diagnosing deterioration of electronic components from the situation of self-heating.

The deterioration diagnosis system according to one aspect of the present disclosure is a deterioration diagnosis system that performs deterioration diagnosis of a power conversion system. The power conversion system includes a plurality of electronic components. The power conversion system converts power between the first power and the second power in at least one direction. The deterioration diagnosis system includes a diagnosis unit. The diagnostic unit performs deterioration diagnosis on at least a part of the target parts among the plurality of electronic parts. Based on the temperature information, the diagnostic unit makes a deterioration diagnosis by referring to the self-heating of the target component when the target component is energized. The temperature information is information related to the measurement result of the temperature of the target component.

The deterioration diagnosis method according to another aspect of the present disclosure is a deterioration diagnosis method for performing deterioration diagnosis of a power conversion system. The power conversion system includes a plurality of electronic components. The power conversion system converts power between the first power and the second power in at least one direction. The degradation diagnostic method has a diagnostic step. The diagnosis step is a step of performing deterioration diagnosis of at least a part of the target parts among the plurality of electronic parts. In the diagnosis step, deterioration diagnosis is performed with reference to the self-heating of the target part when the target part is energized based on the temperature information. The temperature information is information regarding the measurement result of the temperature of the target component.

The program according to yet another aspect of the present disclosure is a program for causing one or more processors to execute the deterioration diagnosis method.

The electric power system according to still another aspect of the present disclosure includes a deterioration diagnosis system and an electric power conversion system. The power conversion system converts power between the first power and the second power in at least one direction.

According to this disclosure, there is an effect that deterioration of electronic components can be diagnosed from the situation of self-heating.

FIG. 1 is a schematic configuration diagram of a deterioration diagnosis system and an electric power system according to an embodiment. FIG. 2 is a perspective view of the power conversion system used in the same power system as viewed from below, and is a perspective view showing a state in which the cover is closed. FIG. 3 is a perspective view of the power conversion system used in the same power system as viewed from above, and is a perspective view showing a state in which the cover is opened. FIG. 4A is a graph showing the temperature change of the target component with respect to the deterioration diagnosis system according to the comparative example. FIG. 4B is a graph showing the temperature change of the target component with respect to the deterioration diagnosis system according to the embodiment. FIG. 5A is a graph showing another temperature change of the target component with respect to the deterioration diagnosis system according to the comparative example. FIG. 5B is a graph showing another temperature change of the target component with respect to the deterioration diagnosis system according to the embodiment. FIG. 6 is a graph showing a temperature change in the first operation example of the deterioration diagnosis system according to the embodiment. FIG. 7 is a flowchart showing a first operation example of the deterioration diagnosis system according to the embodiment. FIG. 8 is a graph showing a temperature change in the second operation example of the deterioration diagnosis system according to the embodiment. FIG. 9 is a flowchart showing a second operation example of the deterioration diagnosis system according to the embodiment.

(Embodiment)
Hereinafter, the deterioration diagnosis system and the electric power system according to the embodiment will be described with reference to the drawings. However, the embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the following embodiments and modifications. Other than the following embodiments and modifications, various changes can be made according to the design and the like as long as they do not deviate from the technical idea of the present disclosure.

In addition, each of the figures described in the following embodiments and the like is a schematic view, and the ratio of the size and the thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. Not always.

(1) Outline First, an outline of the deterioration diagnosis system 1 and the electric power system 10 according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a deterioration diagnosis system 1 and a power system 10 according to an embodiment.

The deterioration diagnosis system 1 according to the present embodiment is a system for performing deterioration diagnosis of the power conversion system 2, and as shown in FIG. 1, constitutes the power system 10 together with the power conversion system 2. That is, the power system 10 includes a deterioration diagnosis system 1 and a power conversion system 2.

The power conversion system 2 converts power between the first power and the second power in at least one direction. Each of the first power and the second power is AC power or DC power. Here, in the present embodiment, it is assumed that the power conversion system 2 is a PCS (Power Conditioning Subsystem). Therefore, for example, the first power is DC power and the second power is AC power. More specifically, the first electric power is the generated electric power of a solar cell, a fuel cell, a gas engine, etc., and the second electric power is the electric power supplied from the electric power system. That is, in the present embodiment, the power conversion system 2 converts power between the first power and the second power in at least one direction (the direction of converting the first power to the second power). That is, the power conversion system 2 according to the present embodiment includes a DC-AC converter (DC-AC converter). The first power and the second power may be reversed. That is, the first power may be AC power and the second power may be DC power. In this case, the power conversion system 2 converts the second power into the first power.

In short, the deterioration diagnosis system 1 according to the present embodiment is a system for performing deterioration diagnosis of the power conversion system 2. The power conversion system 2 includes a plurality of electronic components 222 (see FIG. 3). The power conversion system 2 converts power between the first power and the second power in at least one direction. As shown in FIG. 1, the deterioration diagnosis system 1 includes a diagnosis unit 111. The diagnosis unit 111 performs deterioration diagnosis on at least a part of the target parts 200 (see FIG. 3) among the plurality of electronic parts 222. Based on the temperature information of the target component 200, the diagnosis unit 111 performs a deterioration diagnosis with reference to the self-heating of the target component 200 when the target component 200 is energized. The temperature information is information regarding the measurement result of the temperature of the target component 200.

In the deterioration diagnosis system 1 according to the present embodiment, as described above, the temperature (surface temperature T1) of the target component 200 when the target component 200 is energized is measured. That is, the measurement result includes the surface temperature T1 of the target component 200. Therefore, the diagnosis unit 111 can perform a deterioration diagnosis of the target component 200 from the state of self-heating of the target component 200.

(2) Details Next, the details of the deterioration diagnosis system 1 and the power system 10 according to the present embodiment will be described with reference to FIGS. 1 to 3. FIG. 2 is a perspective view of the power conversion system 2 used in the power system 10 as viewed from below, showing a state in which the cover is closed. FIG. 3 is a perspective view of the power conversion system 2 as viewed from above, showing a state in which the cover is opened.

As shown in FIG. 1, the electric power system 10 according to the present embodiment includes a deterioration diagnosis system 1 and an electric power conversion system 2. The deterioration diagnosis system 1 and the power conversion system 2 are configured to be communicable via, for example, a network 3 such as the Internet.

(2.1) Premise In the present embodiment, one of a plurality of electronic components 222 (see FIG. 3) constituting the power conversion unit (DC-AC converter) 22 of the power conversion system 2 is the target component 200 (FIG. 3). See). However, the target component 200 is not limited to one, and may be two or more. The details of the power conversion unit 22 will be described later.

The "target component" referred to in the present disclosure refers to an electronic component 222 that can be a factor of deteriorating the function of the power conversion system 2 among a plurality of electronic components 222 constituting the power conversion system 2. The target component 200 includes, for example, a switching element, a fuse, a resistor, and an electrolytic capacitor. As an example in this embodiment, the target component 200 is a switching element.

Further, "deterioration" as used in the present disclosure means that the performance or quality of the target component 200 is deteriorated, and for example, it means that the internal resistance of the target component 200 is increased.

Further, the "temperature information" referred to in the present disclosure is information regarding the measurement result of the temperature of the target component 200, and may be the temperature of the target component 200 (surface temperature T1) itself, or the temperature of the target component 200. It may be processed. As an example in the present embodiment, the temperature information includes the temperature rise rate R1 (= ΔT / Δtb) of the target component 200 during the measurement period (Δtb). The measurement period (Δtb) will be described later.

Further, the "energization information" referred to in the present disclosure is information indicating whether or not the target component 200 is energized. For example, when the target component 200 is a switching element, the switching element on / off information (on). Information indicating whether it is present or off), or it may be the value of the current flowing through the switching element. As an example in the present embodiment, the energization information includes on / off information of the switching element.

(2.2) Deterioration Diagnosis System Next, the configuration of the deterioration diagnosis system 1 according to the present embodiment will be described with reference to FIG.

As shown in FIG. 1, the deterioration diagnosis system 1 according to the present embodiment includes a control unit 11, a measurement unit 12, a storage unit 13, and a communication unit 14.

(2.2.1) Control unit The control unit 11 mainly comprises a computer system having one or more processors and one or more memories. That is, the function of the control unit 11 (including the diagnostic unit 111) is realized by executing the program recorded in one or more memories of the computer system by one or more processors. The program may be pre-recorded in a memory, provided through a telecommunication line such as the Internet, or may be recorded and provided on a non-temporary recording medium such as a memory card. The diagnostic unit 111 will be described later.

The control unit 11 is configured to individually control the measurement unit 12 and the communication unit 14. By controlling the measuring unit 12, the control unit 11 measures the surface temperature T1 of the target component 200 and the internal temperature T2 of the housing 20 of the power conversion system 2. Further, the control unit 11 controls the communication unit 14 to perform communication with the communication unit 24 of the power conversion system 2. Here, the surface temperature T1 of the target component 200 is the sum of the self-heating and the ambient temperature. The housing 20 and the communication unit 24 will be described later.

As shown in FIG. 1, the control unit 11 has a diagnosis unit 111. As described above, the diagnosis unit 111 performs deterioration diagnosis on at least a part of the target component 200 (see FIG. 3) of the plurality of electronic components 222 (see FIG. 3). FIG. 6 is a graph showing a temperature change in the first operation example of the deterioration diagnosis system 2. Based on the temperature information of the target component 200, the diagnosis unit 111 diagnoses the deterioration of the target component 200 with reference to the self-heating of the target component 200 when the target component 200 is energized. Specifically, the diagnostic unit 111 calculates the temperature rise rate R1 (= ΔT / Δtb) in the measurement period Δtb from the surface temperature T1 of the target component 200 measured by the measurement unit 12 in the measurement period Δtb (see FIG. 6). Then, the temperature rise rate R1 and the reference value Rs are compared. Then, when the temperature rise rate R1 is less than the reference value Rs, the diagnosis unit 111 diagnoses (determines) that the target component 200 has not deteriorated (the target component 200 is normal). Further, when the temperature rise rate R1 is equal to or higher than the reference value Rs, the diagnosis unit 111 diagnoses (determines) that the target component 200 has deteriorated (the target component 200 is abnormal). Here, since the surface temperature T1 of the target component 200 is the sum of the self-heating of the target component 200 and the ambient temperature, in the present embodiment, the diagnostic unit 111 indirectly refers to the self-heating of the target component 200. It will be. Further, the self-heating of the target component 200 increases as the internal resistance of the target component 200 increases.

By the way, the surface temperature T1 of the target component 200 rises when an electric current flows through the target component 200. That is, the surface temperature T1 of the target component 200 rises when the target component 200 is energized. Therefore, the diagnostic unit 111 needs to set the timing when the target component 200 is energized as the start timing of the measurement period Δtb (see FIG. 6). In the deterioration diagnosis system 1 according to the present embodiment, the communication unit 14 acquires the above-mentioned energization information by communicating with the communication unit 24 of the power conversion system 2. Therefore, the diagnosis unit 111 diagnoses the deterioration of the target component 200 based on the energization information received from the power conversion system 2. The length of the measurement period Δtb may be determined based on the energization information from the power conversion system 2 (information that the energization of the target component 200 is turned off), or may be determined in advance.

Further, the surface temperature T1 of the target component 200 differs depending on the environmental temperature (ambient temperature) of the environment in which the target component 200 is placed. Specifically, the higher the environmental temperature, the higher the surface temperature T1 of the target component 200, and the lower the environmental temperature, the lower the surface temperature T1 of the target component 200. In the power conversion system 2 according to the present embodiment, the target component 200 is housed in the housing 20 (see FIG. 3), as will be described later. That is, the power conversion system 2 further includes a housing 20 that accommodates a plurality of electronic components 222 (including the target component 200). Therefore, it is preferable that the diagnosis unit 111 refers to the internal temperature T2 of the housing 20 when diagnosing the deterioration of the target component 200. As a result, the diagnosis unit 111 can perform deterioration diagnosis according to the internal environment of the housing 20.

Further, the surface temperature T1 of the target component 200 also differs depending on the operating state of the power conversion system 2 including the target component 200. For example, when the operating rate of the power conversion system 2 is high, the surface temperature T1 of the target component 200 is also high, but when the operating rate of the power conversion system 2 is low, the surface temperature T1 of the target component 200 is too high. It doesn't become. Therefore, it is preferable that the diagnosis unit 111 operates the power conversion system 2 under the same operating conditions when diagnosing the deterioration of the target component 200. In other words, it is preferable that the operating conditions of the power conversion system 2 during the diagnosis of deterioration diagnosis are the same. As a result, the measuring unit 12 can measure the surface temperature T1 of the target component 200 under the same conditions. Here, the operating conditions (operating conditions) of the power conversion system 2 are defined by the input voltage, input current, output voltage, and output current of the power conversion system 2. In this case, if each of the input voltage, input current, output voltage, and output current of the power conversion system 2 is a desired value, it can be considered that the operating conditions of the power conversion system 2 are the same.

Further, the surface temperature T1 of the target component 200 also differs depending on the operating state of the ventilation device 23. For example, when the ventilation device 23 is operating normally, the internal temperature T2 of the housing 20 can be controlled to a desired temperature, and the surface temperature T1 of the target component 200 corresponds to the internal temperature T2. It becomes the temperature. On the other hand, when the ventilation device 23 is not operating normally, the internal temperature T2 of the housing 20 cannot be controlled to a desired temperature, and the internal temperature T2 of the housing 20 is higher than the desired temperature ( Or low) temperature. Then, the surface temperature T1 of the target component 200 becomes a temperature corresponding to the internal temperature T2. As described above, since the surface temperature T1 of the target component 200 differs depending on the operating state of the ventilation device 23, the diagnostic unit 111 refers to the operating state of the ventilation device 23 when diagnosing the deterioration of the target component 200. Is preferable. As a result, the diagnosis unit 111 can perform deterioration diagnosis according to the internal environment of the housing 20 in which the target component 200 is housed. The ventilation device 23 will be described later.

(2.2.2) Measuring unit The measuring unit 12 is configured to measure the surface temperature T1 of the target component 200 and the internal temperature T2 of the housing 20 (see FIG. 2) of the power conversion system 2. As shown in FIG. 1, the measuring unit 12 has a sensing unit 121.

The sensing unit 121 includes, for example, at least one thermocouple. In the present embodiment, the sensing unit 121 measures the surface temperature T1 of at least one target component 200 and the internal temperature T2 of the housing 20. Therefore, the sensing unit 121 includes at least two thermocouples. At least two thermocouples are attached to the surface of at least one target component 200 (the surface opposite to the substrate 221 on which the target component 200 is mounted in FIG. 3), and the internal space 2000 of the housing 20 (FIG. 3). It is located in the center of (see).

(2.2.3) Storage unit The storage unit 13 includes, for example, a rewritable non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory). The storage unit 13 stores the reference value Rs. The reference value Rs is a comparison target of the temperature rise rate R1 of the target component 200. Further, the storage unit 13 stores the temperature rise rate R1 of the target component 200, the type (for example, name) of the target component 200, and the internal temperature T2 of the housing 20 at the start of measurement of the surface temperature T1 of the target component 200. Store in association with each other.

(2.2.4) Communication unit The communication unit 14 is a communication interface capable of communicating with the power conversion system 2 (communication unit 24). The communication unit 14 is configured to communicate with the power conversion system 2 (communication unit 24) directly or indirectly via the network 3 or a repeater or the like. In the present embodiment, the communication unit 14 can communicate with the power conversion system 2 (communication unit 24) via a network 3 such as the Internet. As a result, the deterioration diagnosis system 1 can acquire the operation information of the ventilation device 23 from the power conversion system 2. The "operation information" referred to here is information indicating whether or not the ventilation device 23 is operating, and includes, for example, information regarding the rotation speed of the fan 231 of the ventilation device 23. The ventilation device 23 and the fan 231 will be described later.

(2.3) Power Conversion System Next, the configuration of the power conversion system 2 according to the present embodiment will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the power conversion system 2 according to the present embodiment includes a control unit 21, a power conversion unit 22, a ventilation device 23, and a communication unit 24. Further, in the present embodiment, the power conversion system 2 further includes a housing 20 as shown in FIGS. 2 and 3.

(2.3.1) Control unit The control unit 21 mainly comprises a computer system having one or more processors and one or more memories. That is, the function of the control unit 21 is realized by executing the program recorded in one or more memories of the computer system by one or more processors. The program may be pre-recorded in a memory, provided through a telecommunication line such as the Internet, or may be recorded and provided on a non-temporary recording medium such as a memory card.

The control unit 21 is configured to individually control the power conversion unit 22, the ventilation device 23, and the communication unit 24. The control unit 21 converts the first power into the second power by controlling the power conversion unit 22 (switching element). The control unit 21 controls the ventilation device 23 to control the internal temperature T2 of the housing 20 to a desired temperature. Further, the control unit 21 controls the communication unit 24 to communicate with the communication unit 14 of the deterioration diagnosis system 1.

(2.3.2) Power Conversion Unit As described above, the power conversion unit 22 supplies the DC power (generated power) supplied from the solar cell or the like as the first power to the power system as the second power. Includes a DC-AC converter that converts to AC power. That is, as shown in FIG. 3, the power conversion unit 22 (power conversion system 2) includes a substrate 221 on which a plurality of (six in the illustrated example) electronic components 222 for functioning as a DC-AC converter are mounted. ing.

The board 221 is, for example, a printed wiring board. The plurality of electronic components 222 include switching elements, fuses, resistors and electrolytic capacitors, as described above. In the present embodiment, as shown in FIG. 3, one of the plurality of electronic components 222 is the target component 200. As shown in FIG. 3, the substrate 221 constituting the power conversion unit 22 is housed in the housing 20. In other words, a plurality of electronic components 222 (including the target component 200) mounted on the substrate 221 are housed in the housing 20.

(2.3.3) Ventilation device The ventilation device 23 is a device for ventilating between the internal space 2000 (see FIG. 3) of the housing 20 and the outside. That is, the power conversion system 2 according to the present embodiment further includes a ventilation device 23 that ventilates between the internal space 2000 of the housing 20 and the outside.

The ventilation device 23 has a fan 231 as shown in FIGS. 1 and 3. The fan 231 is provided inside the housing 20 at a position facing the exhaust port 2612 (see FIG. 2). The fan 231 is configured to discharge the air taken into the internal space 2000 of the housing 20 through the intake port 2611 (see FIG. 2) to the outside through the exhaust port 2612. That is, the fan 231 is configured to circulate air between the internal space 2000 of the housing 20 and the outside. Thereby, the internal temperature T2 of the internal space 2000 of the housing 20 can be controlled to a desired temperature. The intake port 2611 and the exhaust port 2612 will be described later.

(2.3.4) Communication unit The communication unit 24 is a communication interface capable of communicating with the communication unit 14 of the deterioration diagnosis system 1. The communication unit 24 is configured to communicate with the communication unit 14 directly or indirectly via the network 3 or a repeater or the like. In the present embodiment, the communication unit 24 can communicate with the communication unit 14 via a network 3 such as the Internet. As a result, the power conversion system 2 can acquire, for example, the diagnosis result of the diagnosis unit 111 from the deterioration diagnosis system 1 via the communication units 14 and 24.

(2.3.5) Housing The housing 20 is made of metal, for example, and has a rectangular box shape that is long in one direction (vertical direction in FIG. 2) as shown in FIGS. 2 and 3. The housing 20 has a body 25 and a cover 26.

As shown in FIG. 3, the body 25 is formed in a hollow rectangular parallelepiped shape by the rear wall 251 and the upper wall 252, the lower wall 253, the right wall 254, and the left wall 255. An opening 258 is provided on one side 2501 of the body 25. The cover 26 is attached to the body 25 via a plurality of hinges 99 (four in the illustrated example). The cover 26 can be opened and closed between a closed position that covers the opening 258 of the body 25 and an open position that opens the opening 258 of the body 25.

As shown in FIG. 2, the cover 26 has a cover main body 261, a louver 262, and a cap portion 263. The cover body 261 has a rectangular plate shape that is long in one direction (vertical direction in FIG. 2). The cover body 261 is provided with an intake port 2611 and an exhaust port 2612. The intake port 2611 is located above the exhaust port 2612. The intake port 2611 is covered by a louver 262. The exhaust port 2612 is covered with a shade portion 263. The intake port 2611 and the exhaust port 2612 are connected to each other via the internal space 2000 of the housing 20.

Here, the fan 231 of the ventilation device 23 described above faces the exhaust port 2612. Therefore, by operating the fan 231 the air taken into the internal space 2000 of the housing 20 from the intake port 2611 is discharged to the outside from the exhaust port 2612 through the fan 231. As a result, air can be circulated between the internal space 2000 of the housing 20 and the outside, and as a result, the internal temperature T2 of the housing 20 can be controlled to a desired temperature. In this case, the internal temperature T2 of the housing 20 can be controlled to a desired temperature by controlling the operating time of the fan 231.

The louver 262 has a plurality of blades 2621 as shown in FIG. The plurality of blades 2621 are configured to be openable and closable according to a control signal from the control unit 21. That is, the plurality of blades 2621 can be opened and closed between the first position for closing the intake port 2611 provided in the cover main body 261 and the second position for opening the intake port 2611. In the present embodiment, the opening / closing portion is composed of a louver 262 having a plurality of blades 2621. Further, in the present embodiment, the opening is configured by the intake port 2611.

(3) Temperature Control Next, the temperature control of the target component 200 by the ventilation device 23 will be described with reference to FIGS. 4A to 5B. In the following, a case where the target component 200 is a resistor will be described as an example.

(3.1) First Control Example First, a first control example of the temperature (surface temperature T1) of the target component 200 by the ventilation device 23 will be described with reference to FIGS. 4A and 4B.

FIG. 4A is a graph showing the temperature change of the target component with respect to the deterioration diagnosis system according to the comparative example. In FIG. 4A, the broken line a1 shows the temperature change of the target part in the summer, and the solid line b1 shows the temperature change of the target part in the winter. Further, in FIG. 4A, the ventilation device 23 is operated during any of the periods P1 to P3. Further, in FIG. 4A, the period P2 is a measurement period for measuring the temperature (surface temperature) of the target component.

As described above, the temperature of the target part (surface temperature) is affected by the environmental temperature (ambient temperature). Therefore, as shown in FIG. 4A, the temperature of the target part at the start of the measurement period (period P2) is in the summer. And in winter. Therefore, the accuracy of deterioration diagnosis of the target part may differ between summer and winter. Therefore, it is preferable to control the temperature of the target component at the start of the measurement period to be constant in order to perform the deterioration diagnosis of the target component with constant accuracy regardless of the season.

FIG. 4B is a graph showing the temperature change of the target component 200 with respect to the deterioration diagnosis system 1 according to the present embodiment. In FIG. 4B, the ventilation device 23 is operated during the periods P1 and P3, and the ventilation device 23 is stopped during the period P2. That is, in the deterioration diagnosis system 1 according to the present embodiment, the fan 231 of the ventilation device 23 is stopped during the period P2 as the measurement period Δtb (see FIG. 6). In other words, the rotation speed of the fan 231 during the measurement period Δtb is constant (zero).

In the deterioration diagnosis system 1 according to the present embodiment, as shown by the solid line c1 in FIG. 4B, the temperature (surface temperature T1) of the target component 200 at the start of the period P2 as the measurement period Δtb is constant in the summer. The control of the ventilation device 23 is different between in winter and in winter. Specifically, in the present embodiment, for example, the operation of the ventilation device 23 is controlled so that the operation time of the ventilation device 23 in the summer is shorter than the operation time of the ventilation device 23 in the winter. Thereby, the temperature of the target component 200 at the start of the measurement period Δtb can be controlled to be constant regardless of the season. In short, in the deterioration diagnosis system 1 according to the present embodiment, the internal temperature T2 of the housing 20 at the start of the deterioration diagnosis (at the start of the measurement period Δtb) is constant.

(3.2) Second Control Example Next, a second control example of the temperature (surface temperature T1) of the target component 200 by the ventilation device 23 will be described with reference to FIGS. 5A and 5B.

FIG. 5A is a graph showing the temperature change of the target component with respect to the deterioration diagnosis system according to the comparative example. In FIG. 5A, the broken line a2 shows the temperature change of the target component when the ventilation capacity of the ventilation device 23 is reduced, and the solid line b2 shows the temperature change of the target component when the ventilation capacity of the ventilation device 23 is normal. Shown. Further, in FIG. 5A, the ventilation device 23 is operated during any of the periods P1 to P3. Further, in FIG. 5A, the period P2 is a measurement period for measuring the temperature (surface temperature) of the target component.

As shown in FIG. 5A, when the ventilation device 23 is operated during the period P2, which is the measurement period, the temperature of the target component changes according to the ventilation capacity of the ventilation device 23. That is, when the ventilation capacity of the ventilation device 23 is reduced, the temperature rise rate of the target component is increased as shown by the broken line a2. On the other hand, when the ventilation capacity of the ventilation device 23 is normal, the temperature rise rate of the target component becomes small as shown by the solid line b2. Therefore, in the period P2, which is the measurement period, it is preferable to stop the ventilation device 23 so that the temperature rise rate R1 of the target component 200 is not affected by the ventilation capacity of the ventilation device 23.

In the deterioration diagnosis system 1 according to the present embodiment, the ventilation device 23 is stopped during the period P2 which is the measurement period Δtb. As a result, as shown by the solid line c2 in FIG. 5B, the temperature rise rate R1 of the temperature (surface temperature T1) of the target component 200 changes. As a result, the temperature of the target component 200 can be measured under certain conditions regardless of the ventilation capacity of the ventilation device 23.

(4) Operation Next, the operation of the deterioration diagnosis system 1 according to the present embodiment will be described with reference to FIGS. 6 to 9.

(4.1) First Operation Example First, a first operation example of the deterioration diagnosis system 1 will be described with reference to FIGS. 6 and 7. FIG. 6 is a graph showing a temperature change in the first operation example of the deterioration diagnosis system 1. FIG. 7 is a flowchart showing a first operation example of the deterioration diagnosis system 1.

In FIG. 6, "Ta" is the outside air temperature, "Tb" is the upper limit of the set temperature of the internal space 2000 of the housing 20, "Tc" is the saturation temperature of the target component 200, and "Td" is. This is the lower limit of the set temperature of the internal space 2000 of the housing 20. Further, in FIG. 6, the broken line d1 indicates the surface temperature (component temperature) T1 of the target component 200, and the solid line e1 indicates the internal temperature T2 of the housing 20.

The power conversion system 2 is stopped before the time t0, and the operation of the power conversion system 2 is started at the time t0. In this case, as described above, it is preferable to operate the power conversion system 2 under the same operating conditions (operating conditions). Here, the ventilation device 23 is stopped before the time t0 and during the period from the time t0 to the time t1.

In the cooling period Δta, which is the period from time t1 to time t2, the internal temperature T2 of the housing 20 is lowered by operating the ventilation device 23 (fan 231) (step ST1). Further, in the cooling period Δta, it is preferable that the louver (opening / closing portion) 262 is set to the second position (the position where the intake port 2611 is opened). At this time, the surface temperature T1 of the target component 200 decreases as the internal temperature T2 of the housing 20 decreases. At time t2, the internal temperature T2 of the housing 20 reaches the lower limit value Td due to the ventilation capacity of the ventilation device 23. At this time, the surface temperature T1 of the target component 200 also becomes the minimum value.

Next, in the measurement period Δtb, which is the period from the time t2 to the time t3, the measuring unit 12 measures the surface temperature T1 of the target component 200 (step ST2). Further, in the measurement period Δtb, it is preferable that the louver (opening / closing portion) 262 is set to the first position (the position where the intake port 2611 is closed). At this time, the ventilation device 23 (fan 231) is stopped. The diagnosis unit 111 calculates the temperature rise rate R1 (= ΔT / Δtb) of the surface temperature T1 of the target component 200 during the measurement period Δtb from the measurement result of the measurement unit 12 during the measurement period Δtb. Then, the diagnosis unit 111 reads out the reference value Rs from the storage unit 13 and compares the temperature rise rate R1 with the reference value Rs (step ST3). Here, immediately after the ventilation device 23 is stopped, the internal temperature T2 of the housing 20 is stable at the lower limit value Td, so that the target component 200 self-heats without being affected by the heat generated from the other electronic components 222. The temperature can be measured by.

When the temperature rise rate R1 is equal to or higher than the reference value Rs (step ST3: Yes), the diagnosis unit 111 diagnoses (determines) that the target component 200 has deteriorated (step ST4). On the other hand, when the temperature rise rate R1 is less than the reference value Rs (step ST3: No), the diagnosis unit 111 diagnoses (determines) that the target component 200 is normal (not deteriorated) (step ST5). Here, in the first operation example, steps ST3 to ST5 are diagnostic steps.

Similarly, the deterioration diagnosis system 1 measures the surface temperature T1 of the target component 200 during the period from time t4 to time t6 and the period from time t7 to time t9, and from this measurement result, the surface temperature of the target component 200 is measured. The temperature rise rate R1 of T1 is calculated and the deterioration diagnosis of the target component 200 is performed.

In the deterioration diagnosis system 1 according to the first operation example, as described above, the measuring unit 12 has the surface of the target component 200 when the target component 200 is energized (when the power conversion system 2 is operating) during the measurement period Δtb. The temperature T1 is being measured. Then, the diagnosis unit 111 calculates the temperature rise rate R1 of the surface temperature T1 of the target component 200 based on the measurement result of the measurement unit 12, and performs the deterioration diagnosis of the target component 200 from the temperature rise rate R1. Therefore, according to the deterioration diagnosis system 1 according to the first operation example, the deterioration diagnosis of the target component 200 can be performed from the state of self-heating of the target component 200.

(4.2) Second Operation Example Next, a second operation example of the deterioration diagnosis system 1 will be described with reference to FIGS. 8 and 9. FIG. 8 is a graph showing the temperature change in the second operation example of the deterioration diagnosis system 1. FIG. 9 is a flowchart showing a second operation example of the deterioration diagnosis system 1.

In FIG. 8, "Ta" is the outside air temperature, "Tb" is the saturation temperature of the internal space 2000 of the housing 20, and "Tc" is the saturation temperature of the target component 200. Further, in FIG. 8, the broken line d2 indicates the surface temperature T1 of the target component 200, and the solid line e2 indicates the internal temperature T2 of the housing 20.

The operation of the power conversion system 2 is stopped before the time t0, and the operation of the power conversion system 2 is started at the time t0. In this case, as described above, it is preferable to operate the power conversion system 2 under the same operating conditions (operating conditions).

After operating the power conversion system 2 in the period from time t0 to time t1, the power conversion system 2 is stopped in the period from time t1 to time t2 (step ST11). At this time, the diagnostic unit 111 determines whether or not a certain time (here, the time from the time t1 to the time t2) has elapsed since the power conversion system 2 was stopped (step ST12). The diagnostic unit 111 continues to stop the power conversion system 2 (step ST11) unless a certain time has elapsed since the power conversion system 2 was stopped (step ST12: No). On the other hand, if a certain time has elapsed since the power conversion system 2 was stopped (step ST12: Yes), the diagnostic unit 111 has the surface temperature T1 of the target component 200 and the internal temperature T2 of the housing 20 at time t3. Is stable, the surface temperature T1 of the target component 200 is measured by the measuring unit 12 (step S13). After time t3, the power conversion system 2 is operated.

In the measurement period Δtb, which is the period from the time t3 to the time t4, the measuring unit 12 measures the surface temperature T1 of the target component 200 (step ST13). At this time, the ventilation device 23 (fan 231) is stopped. The diagnosis unit 111 calculates the temperature rise rate R1 (= ΔT / Δtb) of the surface temperature T1 of the target component 200 during the measurement period Δtb from the measurement result of the measurement unit 12. Then, the diagnosis unit 111 reads the reference value Rs from the storage unit 13 and compares the temperature rise rate R1 with the reference value Rs (step ST14).

When the temperature rise rate R1 is equal to or higher than the reference value Rs (step ST14: Yes), the diagnosis unit 111 diagnoses (determines) that the target component 200 has deteriorated (step ST15). On the other hand, when the temperature rise rate R1 is less than the reference value Rs (step ST14: No), the diagnosis unit 111 diagnoses (determines) that the target component 200 is normal (not deteriorated) (step ST16). Here, in the second operation example, steps ST14 to ST16 are diagnostic steps.

In the deterioration diagnosis system 1 according to the second operation example, as described above, the measuring unit 12 has the surface of the target component 200 when the target component 200 is energized (when the power conversion system 2 is operating) during the measurement period Δtb. The temperature T1 is being measured. Then, the diagnosis unit 111 calculates the temperature rise rate R1 of the surface temperature T1 of the target component 200 based on the measurement result of the measurement unit 12, and performs the deterioration diagnosis of the target component 200 from the temperature rise rate R1. Therefore, according to the deterioration diagnosis system 1 according to the second operation example, the deterioration diagnosis of the target component 200 can be performed from the state of self-heating of the target component 200.

(5) Modified Example The above-described embodiment is only one of the various embodiments of the present disclosure. The above-described embodiment can be changed in various ways depending on the design and the like as long as the object of the present disclosure can be achieved. Further, the same function as the deterioration diagnosis system 1 according to the above-described embodiment may be realized by a deterioration diagnosis method, a (computer) program, a non-temporary recording medium on which the program is recorded, or the like.

The deterioration diagnosis method according to another aspect is a deterioration diagnosis method for performing deterioration diagnosis of the power conversion system 2. The power conversion system 2 includes a plurality of electronic components 222 (see FIG. 3). The power conversion system 2 converts power between the first power and the second power in at least one direction. The deterioration diagnosis method has diagnostic steps (ST3 to ST5, and ST14 to ST16). The diagnosis step is a step of performing a deterioration diagnosis on at least a part of the target parts 200 (see FIG. 3) of the plurality of electronic parts 222. In the diagnosis step, deterioration diagnosis of the target component 200 is performed with reference to the self-heating of the target component 200 when the target component 200 is energized based on the temperature information of the target component 200. The temperature information is information regarding the measurement result of the temperature (surface temperature T1) of the target component 200. Further, the program according to still another aspect is a program for causing one or more processors to execute the above-mentioned deterioration diagnosis method.

The following is a list of modified examples of the above-described embodiment. The modifications described below can be applied in combination as appropriate.

The deterioration diagnosis system 1 in the present disclosure includes a computer system. The main configuration of a computer system is a processor and memory as hardware. When the processor executes the program recorded in the memory of the computer system, the function as the deterioration diagnosis system 1 in the present disclosure is realized. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunications line, and may be recorded on a non-temporary recording medium such as a memory card, optical disk, hard disk drive, etc. that can be read by the computer system. May be provided. A processor in a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI). The integrated circuit such as IC or LSI referred to here has a different name depending on the degree of integration, and includes an integrated circuit called a system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Further, an FPGA (Field-Programmable Gate Array) programmed after the LSI is manufactured, or a logical device capable of reconfiguring the junction relationship inside the LSI or reconfiguring the circuit partition inside the LSI should also be adopted as a processor. Can be done. A plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips. The plurality of chips may be integrated in one device, or may be distributed in a plurality of devices. The computer system referred to here includes a microprocessor having one or more processors and one or more memories. Therefore, the microprocessor is also composed of one or a plurality of electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

Further, it is not an essential configuration for the deterioration diagnosis system 1 that a plurality of functions in the deterioration diagnosis system 1 are integrated in one housing. The components of the deterioration diagnosis system 1 may be distributed in a plurality of housings. Further, at least a part of the functions of the deterioration diagnosis system 1 may be realized by a cloud (cloud computing) or the like.

On the contrary, in the above-described embodiment, at least a part of the functions of the power system 10 distributed in a plurality of devices (deterioration diagnosis system 1 and power conversion system 2) may be integrated in one housing. .. For example, some functions of the power system 10 distributed in the deterioration diagnosis system 1 and the power conversion system 2 may be integrated in one housing.

In the above-described embodiment, the surface temperature T1 of the target component 200 and the internal temperature T2 of the housing 20 are measured by a thermocouple, but the surface temperature T1 of the target component 200 is measured by, for example, a thermal image sensor. You may. That is, the thermocouple and the thermal image sensor may be combined to measure the surface temperature T1 of the target component 200 and the internal temperature T2 of the housing 20. According to this configuration, the surface temperature T1 of a plurality of target parts 200 can be collectively measured by one thermal image sensor.

In the above-described embodiment, the deterioration diagnosis system 1 and the power conversion system 2 communicate with each other via the network 3, but the deterioration diagnosis system 1 and the power conversion system 2 may directly communicate with each other.

In the above-described embodiment, as shown in FIG. 6, the timing when the surface temperature T1 of the target component 200 reaches the lower limit value and the timing when the internal temperature T2 of the housing 20 reaches the lower limit value Td coincide with each other. , May be different. For example, the surface temperature T1 of the target component 200 may reach the lower limit value after the internal temperature T2 of the housing 20 reaches the lower limit value.

In the above-described embodiment, the diagnostic unit 111 diagnoses the deterioration of the target component 200 from the temperature rise rate R1 (relative value) of the target component 200, but the diagnostic unit 111, for example, has the surface temperature T1 of the target component 200. Deterioration of the target component 200 may be diagnosed from (absolute value).

In the above-described embodiment, the fan 231 of the ventilation device 23 is stopped during the measurement period Δtb for measuring the surface temperature T1 of the target component 200, but the operating conditions of the fan 231 may be the same in each measurement period Δtb. The rotation speed of the fan 231 may be constant.

In the above-described embodiment, the surface temperature T1 of the target component 200 is referred to in the deterioration diagnosis, and the self-heating of the target component 200 is indirectly referred to, but the self-heating of the target component 200 is directly referred to. You may.

(summary)
As described above, the deterioration diagnosis system (1) according to the first aspect is a deterioration diagnosis system (1) that performs deterioration diagnosis of the power conversion system (2). The power conversion system (2) includes a plurality of electronic components (222). The power conversion system (2) converts power between the first power and the second power in at least one direction. The deterioration diagnosis system (1) includes a diagnosis unit (111). The diagnosis unit (111) performs deterioration diagnosis on at least a part of the target parts (200) among the plurality of electronic parts (222). Based on the temperature information, the diagnosis unit (111) performs deterioration diagnosis with reference to the self-heating of the target component (200) when the target component (200) is energized. The temperature information is information regarding the measurement result of the temperature (surface temperature T1) of the target component (200).

According to this aspect, deterioration of the target part (200) can be diagnosed from the state of self-heating of the target part (200).

In the deterioration diagnosis system (1) according to the second aspect, in the first aspect, the measurement result includes the surface temperature (T1) of the target component (200).

According to this aspect, deterioration of the target part (200) can be diagnosed from the surface temperature (T1) of the target part (200).

In the deterioration diagnosis system (1) according to the third aspect, in the first or second aspect, the temperature information includes the temperature rise rate (R1) of the target component (200).

According to this aspect, the deterioration of the target part (200) can be diagnosed from the temperature rise rate (R1) of the target part (200).

In the deterioration diagnosis system (1) according to the fourth aspect, in any one of the first to third aspects, the diagnosis unit (111) is based on the energization information regarding the energization state of the target component (200). Perform deterioration diagnosis.

According to this aspect, deterioration of the target component (200) can be diagnosed based on the temperature information when the target component (200) is energized.

In the deterioration diagnosis system (1) according to the fifth aspect, in any one of the first to fourth aspects, the power conversion system (2) further includes a housing (20). The housing (20) accommodates a plurality of electronic components (222). The diagnosis unit (111) makes a deterioration diagnosis with reference to the internal temperature (T2) of the housing (20).

According to this aspect, deterioration diagnosis can be performed according to the internal environment of the housing (20) in which the target component (200) is housed.

In the deterioration diagnosis system (1) according to the sixth aspect, in the fifth aspect, the power conversion system (2) further includes a ventilation device (23). The ventilation device (23) ventilates between the internal space (2000) of the housing (20) and the outside. The diagnosis unit (111) makes a deterioration diagnosis with reference to the operating state of the ventilation device (23).

According to this aspect, deterioration diagnosis can be performed according to the internal environment of the housing (20) in which the target component (200) is housed.

In the deterioration diagnosis system (1) according to the seventh aspect, in the sixth aspect, the ventilation device (23) has a fan (231). The fan (231) circulates air between the internal space (2000) of the housing (20) and the outside. In the deterioration diagnosis system (1), the rotation speed of the fan (231) during the measurement period (Δtb) is constant. The measurement period (Δtb) is a period for measuring the temperature of the target component (200).

According to this aspect, the temperature of the target component (200) can be measured under the same conditions.

In the deterioration diagnosis system (1) according to the eighth aspect, the fan (231) is stopped during the measurement period (Δtb) in the seventh aspect.

According to this aspect, the influence of the performance of the ventilation device (23) on the deterioration diagnosis can be reduced.

In the deterioration diagnosis system (1) according to the ninth aspect, the internal temperature (T2) of the housing (20) at the start of the deterioration diagnosis is constant in any one of the fifth to eighth aspects.

According to this aspect, the influence of the internal environment of the housing (20) can be reduced.

In the deterioration diagnosis system (1) according to the tenth aspect, in any one of the fifth to ninth aspects, the housing (20) has an opening / closing portion (262). The opening / closing portion (262) can be opened / closed between a first position for closing the opening (2611) provided in the housing (20) and a second position for opening the opening (2611).

According to this aspect, the internal space (2000) of the housing (20) can be sealed by the opening / closing portion (262).

In the deterioration diagnosis system (1) according to the eleventh aspect, in the tenth aspect, the opening / closing portion (262) is set in the cooling period (Δta) before the measurement period (Δtb) for measuring the temperature of the target component (200). The second position is set, and the opening / closing portion (262) is set to the first position during the measurement period (Δtb).

According to this aspect, the influence of the surrounding environment can be reduced.

In the deterioration diagnosis system (1) according to the twelfth aspect, in any one of the first to eleventh aspects, the operating condition of the power conversion system (2) during the diagnosis of the deterioration diagnosis is when the target component is energized. The operating conditions are the same as those of the power conversion system (2).

According to this aspect, the temperature of the target component (200) can be measured under the same conditions.

The deterioration diagnosis method according to the thirteenth aspect is a deterioration diagnosis method for performing deterioration diagnosis of the power conversion system (2). The power conversion system (2) includes a plurality of electronic components (222). The power conversion system (2) converts power between the first power and the second power in at least one direction. The deterioration diagnosis method includes diagnostic steps (ST3 to ST5, ST14 to ST16). The diagnosis steps (ST3 to ST5, ST14 to ST16) are steps for performing deterioration diagnosis of at least a part of the target parts (200) among the plurality of electronic parts (222). In the diagnosis steps (ST3 to ST5, ST14 to ST16), deterioration diagnosis is performed with reference to the self-heating of the target component (200) when the target component (200) is energized based on the temperature information. The temperature information is information regarding the measurement result of the temperature (T1) of the target component (200).

According to this aspect, deterioration of the target part (200) can be diagnosed from the state of self-heating of the target part (200).

The program according to the fourteenth aspect is a program for causing one or more processors to execute the deterioration diagnosis method according to the thirteenth aspect.

According to this aspect, deterioration of the target part (200) can be diagnosed from the state of self-heating of the target part (200).

The electric power system (10) according to the fifteenth aspect includes a deterioration diagnosis system (1) of any one of the first to twelfth aspects and a power conversion system (2). The power conversion system (2) converts power between the first power and the second power in at least one direction.

According to this aspect, deterioration of the target part (200) can be diagnosed from the state of self-heating of the target part (200).

The configurations according to the second to twelfth aspects are not essential configurations for the deterioration diagnosis system (1) and can be omitted as appropriate.

According to the deterioration diagnosis system, deterioration diagnosis method, program, and electric power system of the present disclosure, deterioration of electronic components can be diagnosed from the situation of self-heating. Therefore, the deterioration diagnosis system, the deterioration diagnosis method, the program, and the electric power system of the present disclosure are industrially useful because the deterioration of the electronic parts can be easily grasped and the replacement of the electronic parts can be easily performed.

1 Deterioration diagnosis system 2 Power conversion system 10 Power system 20 Housing 23 Ventilation device 111 Diagnostic unit 200 Target parts 222 Electronic parts 231 Fans 262 Louvers (opening and closing parts)
2000 Interior space 258 Opening 2611 Intake port (opening)
2612 Exhaust port R1 Temperature rise rate T1 Surface temperature (temperature)
T2 Internal temperature Δta Cooling period Δtb Measurement period ST3 to ST5, ST14 to ST16 Diagnostic step

Claims (15)

1. It is a deterioration diagnosis system that includes a plurality of electronic components and performs deterioration diagnosis of a power conversion system that converts power between the first power and the second power in at least one direction.
   It is provided with a diagnostic unit that performs deterioration diagnosis of at least a part of the target parts among the plurality of electronic parts.
   The diagnostic unit performs the deterioration diagnosis with reference to the self-heating of the target component when the target component is energized, based on the temperature information regarding the measurement result of the temperature of the target component.
   Deterioration diagnosis system.
2. The measurement result includes the surface temperature of the target part.
   The deterioration diagnosis system according to claim 1.
3. The temperature information includes the temperature rise rate of the target component.
   The deterioration diagnosis system according to claim 1 or 2.
4. The diagnostic unit performs the deterioration diagnosis based on the energization information regarding the energization state of the target component.
   The deterioration diagnosis system according to any one of claims 1 to 3.
5. The power conversion system further includes a housing for accommodating the plurality of electronic components.
   The diagnostic unit performs the deterioration diagnosis with reference to the internal temperature of the housing.
   The deterioration diagnosis system according to any one of claims 1 to 4.
6. The power conversion system further includes a ventilation device that ventilates between the internal space of the housing and the outside.
   The diagnostic unit performs the deterioration diagnosis with reference to the operating state of the ventilation device.
   The deterioration diagnosis system according to claim 5.
7. The ventilator has a fan for circulating air between the interior space and the outside.
   The rotation speed of the fan is constant during the measurement period for measuring the temperature of the target component.
   The deterioration diagnosis system according to claim 6.
8. During the measurement period, the fan is stopped,
   The deterioration diagnosis system according to claim 7.
9. The internal temperature at the start of the deterioration diagnosis is constant.
   The deterioration diagnosis system according to any one of claims 5 to 8.
10. The housing has an opening / closing portion that can be opened / closed between a first position for closing the opening provided in the housing and a second position for opening the opening.
    The deterioration diagnosis system according to any one of claims 5 to 9.
11. In the cooling period before the measurement period for measuring the temperature of the target component, the opening / closing part is set to the second position, and in the measuring period, the opening / closing part is set to the first position.
    The deterioration diagnosis system according to claim 10.
12. The operating conditions of the power conversion system during the diagnosis of the deterioration diagnosis are the same as the operating conditions of the power conversion system when the target component is energized.
    The deterioration diagnosis system according to any one of claims 1 to 11.
13. It is a deterioration diagnosis method for performing deterioration diagnosis of a power conversion system having a plurality of electronic components and converting power between the first power and the second power in at least one direction.
    It has a diagnostic step of performing deterioration diagnosis on at least a part of the target parts among the plurality of electronic parts.
    In the diagnosis step, the deterioration diagnosis is performed with reference to the self-heating of the target component when the target component is energized, based on the temperature information regarding the measurement result of the temperature of the target component.
    Deterioration diagnosis method.
14. A program for causing one or more processors to execute the deterioration diagnosis method according to claim 13.
15. The deterioration diagnosis system according to any one of claims 1 to 12, and the deterioration diagnosis system.
    It comprises a power conversion system that converts power between the first power and the second power in at least one direction.
    Power system.

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