CN107492950B - Uninterrupted power supply UPS device - Google Patents
Uninterrupted power supply UPS device Download PDFInfo
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- CN107492950B CN107492950B CN201710954960.5A CN201710954960A CN107492950B CN 107492950 B CN107492950 B CN 107492950B CN 201710954960 A CN201710954960 A CN 201710954960A CN 107492950 B CN107492950 B CN 107492950B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention provides an uninterruptible power supply UPS device, which comprises an uninterruptible power supply UPS branch, a bypass and a controller, wherein the UPS branch is connected with the bypass in parallel, and comprises: the input end of the rectifying unit is used for being connected with an alternating current power supply; the input end of the inversion unit is connected to the output end of the rectification unit, and the output end is used for being connected with a load; the storage battery is connected in parallel between the output end of the rectifying unit and the input end of the inversion unit; the bypass comprises: the bypass switch is used for connecting an alternating current power supply and a load at two ends respectively; the controller is connected to the bypass switch, the rectifying unit and the inversion unit and is used for controlling the switching-on of the rectifying unit and the bypass switch and switching-off of the inversion unit when the alternating current power supply is normal; or when the alternating current power supply is abnormal, controlling to conduct the inversion unit and disconnect the bypass switch and the rectification unit. The UPS device provided by the invention ensures the endurance of the UPS device and provides high reliability of uninterrupted power supply for the UPS device.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a UPS device with uninterrupted power supply.
Background
With the development of economy and society, the problem of power supply reliability not only can bring great economic loss to the industry, such as production cost increase caused by shutdown and restarting, equipment damage, semi-finished product rejection, product quality reduction, marketing difficulty and damage to company images, good business relations with users and the like, but also can bring harm to equipment of important power utilization departments such as medical treatment and the like, serious production and operation accidents are caused, and social influence is caused, so that the economic loss and the social influence are great.
Uninterruptible power supplies (uninterrupted power supply, UPS) have been developed that are system devices that connect a battery to a host and convert dc power to utility power through a host inverter. In the working process of the UPS, when the alternating current power supply is normal, the alternating current is directly supplied to a user; when the AC power supply fails, the direct current provided by the storage battery is inverted into the alternating current to supply the user load, so that the influence of the interruption of the AC power supply on the user load can be reduced.
However, the inventor of the application finds that the UPS device in the prior art has the problem of weak endurance and the like in the process of practicing the application, so that the performance of uninterrupted operation of the UPS cannot be improved, and the power consumption reliability of the load is affected.
Disclosure of Invention
In order to at least solve the technical problem of weak endurance of UPS equipment in the prior art, the following technical scheme is specifically provided:
the invention provides an uninterruptible power supply UPS device, which comprises an uninterruptible power supply UPS branch, a bypass and a controller, wherein the UPS branch is connected with the bypass in parallel, and the UPS branch comprises: the input end of the rectifying unit is used for being connected with an alternating current power supply; the input end of the inversion unit is connected to the output end of the rectification unit, and the output end is used for being connected with a load; a storage battery connected in parallel between the output end of the rectifying unit and the input end of the inverting unit; the bypass comprises: the two ends of the bypass switch are respectively used for connecting the alternating current power supply and the load; a controller connected to the bypass switch, the rectifying unit and the inverting unit, and configured to control the rectifying unit and the bypass switch to be turned on and the inverting unit to be turned off when the ac power supply is normal; or when the alternating current power supply is abnormal, controlling to conduct the inversion unit and disconnecting the bypass switch and the rectification unit.
Optionally, the rectifying unit includes a first IGBT, and the rectifying unit further includes a second IGBT, an emitter of the first IGBT is connected to a collector of the second IGBT, and a collector of the first IGBT is connected to an emitter of the second IGBT, and control poles of the first IGBT and the second IGBT are connected to the controller; the controller is used for outputting control signals to the control poles of the first IGBT and the second IGBT so as to control the rectification unit to be conducted and the inversion unit to be disconnected, or to control the rectification unit to be disconnected and the inversion unit to be conducted.
Optionally, the apparatus further comprises: and a direct current bus capacitor connected between the collector of the first IGBT and the emitter of the second IGBT.
Optionally, the apparatus includes: and each phase of the three phases corresponding to the alternating current power supply is respectively provided with the direct current bus capacitor, the first IGBT and the second IGBT.
Optionally, the controller includes: and the PWM module is used for outputting a first PWM signal to the control electrode of the first IGBT and outputting a second PWM signal with the opposite phase to the first PWM signal to the control electrode of the second IGBT.
Optionally, the PWM module includes: a PWM signal generating component for generating a first PWM signal; and the inverting component is connected to the PWM signal generating component and is used for generating the second PWM signal according to the first PWM signal.
Optionally, the controller further includes a detection module connected to the PWM module, the detection module is configured to detect whether the ac power supply is abnormal, and the detection module includes: a signal acquisition component for acquiring a vector of time delays made up of supply voltage signals; a vector decomposition component for decomposing the vector into a plurality of independent components corresponding to a plurality of sampling points; an abnormal component determination component for analyzing whether a first independent component of the plurality of independent components is coupled with a component of the power supply signal when the power supply voltage is abnormal, and if so, determining the first independent component as an abnormal independent component; and the pulse signal determining component is used for calculating a pulse signal corresponding to the abnormal independent component and judging the moment of abnormal power supply voltage based on the calculated pulse signal.
Optionally, the detection module is configured to perform the following steps: step one, signal acquisition: collected power supply voltage signalU i Composition time lagDThe vectors of (2) are as follows:
wherein,,M=D+1, which is the dimension of x, is setD=15，x[n]Representing supply voltage signalsU i Vector of magnitudes;
step two, vector decomposition:
the vector is decomposed and expressed as the following formula:
x[n]=As[n] (2)
wherein { \displaystyles= (s_ {1}, ldots, s }_{n})^{T}.}
Is a matrix of independent components at the nth sample point, a is a mixing matrix.
Step three, separating the matrix:
thus, the following matrix can be obtained:
y[n]=Wx[n] (3)
wherein,,
is an estimated independent component matrix, W is a separation matrix, A -1 Is a function of the estimated value of (2);
step four, pulse signal coupling:
thus, by the formula (4), the sum is obtaineds i [n]Coupled to signals of abnormal voltagea i [n]
Step five, detecting pulse signals and calculating:
is provided with
(5)
According to formula (3), there is obtained:
the following is rewritten by Z-transformation in the formula (6):
and (3) with
(8)
The time corresponding to the calculated y < n > pulse signal is the time when the power supply voltage is abnormal.
Optionally, the PWM module comprises a field programmable gate array FGPA, and the detection module comprises a digital signal processing DSP chip.
Optionally, the ac power anomaly comprises one or more selected from the group consisting of: voltage phase jumps, voltage drops and/or voltage surges.
According to the UPS device, on one hand, when the alternating current power supply is normal, the bypass switch is controlled to be turned on to supply power to a load, and the rectifying unit is turned on and the inversion unit is turned off to charge the storage battery; on the other hand, when the ac power supply is abnormal, the inverter unit is turned on and the rectifier unit is turned off, and the battery is used to realize uninterrupted power supply. Therefore, the advantages of high-frequency rectification charging and small harmonic wave are realized, and reactive power pollution is not generated to power supply, so that the cruising ability of the UPS device is ensured, and the uninterrupted power supply reliability of the UPS device is ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a UPS device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a connection principle of a UPS device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a three-phase inverter structure regarding the rectifying unit and the inverter unit in fig. 2;
fig. 4 is a schematic diagram of a workflow principle of a UPS device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a detection module according to an embodiment of the invention;
fig. 6 is a waveform diagram of a detection result of a UPS device for voltage phase jump according to an embodiment of the present invention;
fig. 7 is a waveform diagram of a detection result of a UPS device for voltage sag according to an embodiment of the present invention;
fig. 8 is a waveform diagram of a detection result of a UPS device for voltage surge according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Referring to fig. 1, a schematic structure of a UPS device according to an embodiment of the present invention is shown, where the UPS device 10 includes a bypass and a UPS branch connected in parallel, a bypass switch 101 is disposed on the bypass, and a battery 102, a rectifying unit 103, an inverter unit 104, and a controller 105 are disposed on the UPS branch. More specifically, both ends of the bypass switch 101 are used to connect the ac power source 20 and the load 30, respectively, the input end of the rectifying unit 103 is connected to the ac power source 20, and the output end of the rectifying unit 103 is connected to the battery 102 and the input end of the inverting unit 104, the output end of the inverting unit 104 is used to connect the load 30, and the bypass switch 101 is also connected to the controller 105. Wherein, when the alternating current power supply is normal, the controller 105 controls to turn on the rectifying unit 103 and the bypass switch 101 and turn off the inverting unit 104; or when the ac power supply is abnormal, control turns on the inverter unit 104 and turns off the bypass switch 101 and the rectifying unit 103. Therefore, when the power supply is normal, the storage battery is controlled to be charged through the rectifying unit; when the power supply is abnormal, the control unit supplies power to the load through the inverter unit to realize uninterrupted power supply, and at least the cruising ability of the UPS device is increased.
Referring to fig. 2, a schematic diagram of a UPS device according to an embodiment of the present invention is shown, where the UPS device 1 includes: the device comprises a controller 2, a rectifying unit 3, an inversion unit 4, a DC/DC unit 5, an input voltage transformer 6, an input current transformer 7, an output voltage transformer 8, a direct current voltage transformer 9, a display unit 12 and a bypass switch 11; the alternating current input end of the rectifying unit 3 is connected with the input alternating current power supply, the direct current output end of the rectifying unit 3 is connected with the direct current input end of the inversion unit 4, the alternating current output end of the inversion unit 4 is connected with a user load, the output end of the DC/DC unit 5 is connected with the direct current output end of the rectifying unit 3, and the input end of the DC/DC unit 5 is connected with the storage battery; a bypass switch 11, one end of which is connected with the input alternating current power supply, the other end of which is connected with the user load, and the control end of the bypass switch 11 is connected with a control signal end corresponding to the controller 2; the input side of the direct-current voltage sensor 9 is connected with the direct-current output end of the rectifying unit 3, and the voltage signal output end of the direct-current voltage sensor 9 is connected with a direct-current voltage signal input port UDC corresponding to the controller 2; the input side of the input voltage transformer 6 is connected with a main circuit of the input end of the rectifying unit 3, and the voltage signal output end of the input voltage transformer 6 is connected with an input voltage signal input port Ui corresponding to the controller 2; an input current transformer 7 is connected in series with the input circuit of the rectifying unit 3, and the AC current signal output end of the input current transformer 7 is connected with the input port of the AC input current signal of the controller 2I i Are connected; the input side of the output voltage transformer 8 is connected with the main circuit of the output end of the inversion unit 4, and the voltage signal output end of the output voltage transformer 8 is connected with the input port U of the controller 2 for outputting alternating voltage signals o Are connected; output pulse width modulation signal of controller 2Number (number)PWM i123 The port is connected with the PWM control signal end of the rectifying unit 3, and the output pulse width modulation signal of the controller 2PWM o123 The port is connected with a PWM control signal end of the inversion unit 4; the local communication port of the controller 2 is connected to the communication port of the display unit 12. Therefore, high-frequency rectification charging is realized in the embodiment, reactive power pollution is not generated to power supply, and harmonic waves are small.
As further disclosure and optimization of the embodiment of the present invention, the rectifying unit 3 and the inverting unit 4 each include a three-phase inverting structure connected with an ac three-phase and a common dc bus capacitor; as for the three-phase inversion structure, it may be as shown in fig. 3. Wherein, each looks contravariant structure includes: the device comprises a first Insulated Gate Bipolar Transistor (IGBT) and a second IGBT, wherein an emitter of the first IGBT is connected with a collector of the second IGBT, the collector of the first IGBT is connected with the emitter of the second IGBT through a common direct current bus capacitor, control ends of the first IGBT and the second IGBT serving as control ends of an inversion unit are connected with PWM signal output ends of the inversion unit of the control unit corresponding to PWM signals of the corresponding phase inversion unit, signals of the control ends of the first IGBT and the second IGBT are opposite, a collector of the second IGBT is an alternating current output end of the inversion unit, two ends of the common direct current bus capacitor are direct current input ends of the inversion unit, and voltage of the common direct current bus capacitor is direct current voltage UDC of the inversion unit; because the control signals of the control end of the first IGBT and the control end of the second IGBT are opposite, the inversion unit PWM signal output by the inversion unit PWM signal output end of the control unit can generate opposite inversion unit PWM signals through an external inverter or inside the control unit, and then the inversion unit PWM signal and the opposite inversion unit PWM signal are correspondingly input into the control end of the first IGBT and the control end of the second IGBT; the PWM signal may be generated locally at a frequency of 5k to 10 kHz. Therefore, the pulse modulation technology is applied to the UPS device, so that the work and the stop of the rectifying unit and the inverting unit can be switched and controlled more quickly, and the voltage abnormality can be reflected more efficiently and quickly; in addition, the UPS device provided in this embodiment does not need to assist with external devices, that is, the controller itself completes control of the rectifying unit and the inverting unit, so that the function of supplying power to the uninterruptible power supply in the offline mode is achieved.
Referring to fig. 4, a schematic diagram of the operation flow principle of the UPS device is shown, which specifically includes the following steps:
step 401: the controller 2 measures an ac supply voltageU i Ac input currentI i The direct voltage output by the rectifying unit 3U DC Ac output voltage of inverter unit 4U o ；
Step 402: control the DC voltage U output by the rectifying unit 3 DC Charging the storage battery;
step 403: controlling the inverter unit 4 to output a stable alternating voltage;
step 404: detecting and judging whether the input alternating current power supply voltage is normal or not;
if the determination result in step 404 is yes, step 405 is executed in a jumping manner; and if the determination in step 404 is negative, executing step 406 in a jump.
Step 405: the control alternating current power supply is directly output to a load through a bypass switch of the device;
step 406: the control turns off the bypass switch rapidly, and the energy of the storage battery is supplied to the user load through inversion.
Thus, when the alternating current power supply is normal, the alternating current is supplied to a user through the bypass switch of the device; when the AC power supply fails and the power supply voltage drops, the controller of the device rapidly detects the voltage drop, opens the bypass switch, and converts the DC power supplied by the storage battery into AC power to supply the user load, so that the user load is not influenced by the interruption of the AC power supply, and the user power consumption is protected.
The controller collects the alternating current power supply voltage and current, and outputs the alternating current power supply voltage and currentPWM i123 Control the rectifying unit, start rectifying control, the controller outputsPWM o123 And controlling an inversion unit to invert and output stable 220V or 380V alternating voltage, and simultaneously, automatically starting DC/DC, and charging a battery after the commercial power is rectified. If the input AC power supply fails and the input AC voltage drops, the controller turns off the bypass switch and the storage battery passes throughThe DC/DC control outputs a stable direct current voltage, and then the inverter unit outputs a stable alternating current to a user load.
For another aspect of the embodiment of the present invention, that is, for the UPS device, in the related art, a voltage for one cycle or half cycle time is detected to calculate a voltage effective value, and whether or not a power supply abnormality occurs is evaluated by detecting a change in the voltage effective value. However, the inventors of the present application found in the course of practicing the present application that this related art has at least the following drawbacks: the detection and feedback process is slow, and for some sensitive user equipment, the time of a cycle or half cycle still cannot meet the requirement, and can cause great impact to the user equipment. Therefore, how to quickly detect the occurrence of an abnormality in ac power supply is a popular research direction in the industry. It should be noted that the above description of the related art is only for the convenience of the public to understand the present invention, and does not represent the applicant's recognition that the related art is the prior art.
In view of this, a further aspect of the present invention provides an uninterruptible power supply UPS device, where a detection module is further provided, and by using the detection module, it is able to detect whether the ac power supply is abnormal, that is, implement step 404 in fig. 4. More specifically, referring to fig. 5, a schematic structural diagram of a detection module according to an embodiment of the present invention is shown, where the detection module 50 includes a signal acquisition component 501, a vector decomposition component 502, an abnormal signal determination component 503, and a pulse signal determination component 504, which are sequentially connected. More specifically, the signal acquisition component 501 can acquire a vector about the time lag that the supply voltage signal constitutes; vector decomposition component 502 can decompose a vector into a plurality of independent components corresponding to a plurality of sampling points; the abnormal component determination component 503 may analyze whether a first independent component of the plurality of independent components is coupled to a component of the power supply signal when the power supply voltage is abnormal, and if so, determine the first independent component as an abnormal independent component; the pulse signal determining component 504 may calculate a pulse signal corresponding to the abnormality independent component, and determine a timing of the abnormality of the power supply voltage based on the calculated pulse signal.
Therefore, the independent component analysis method is applied to detection and control strategies of the UPS device on power supply abnormality, the occurrence of power supply abnormality can be detected rapidly, and the power supply abnormality can be judged rapidly after the occurrence of power supply voltage abnormality, so that the UPS device is suitable for electric equipment with higher power consumption requirements and higher sensitivity, and the reliability of power consumption is ensured.
As an example, the embodiments of the present invention will be described in terms of two cases, abrupt voltage phase change or voltage sag of the power supply.
The method for rapidly judging the voltage phase jump specifically comprises the following steps:
and a signal acquisition step:
collected power supply voltage signalU i Frequency of (2)f[n]Composition time lagDThe vectors of (2) are as follows:
wherein,,M=D+1, which is the dimension of x, is setD=16，x[n]Representing the supply voltageU i A vector of frequencies;
vector decomposition step:
the vector is decomposed and expressed as the following formula:
x[n]=As[n] (2)
wherein { \displaypole s= (s_ {1}, \ldots, s_ { n }) { T }
Is a matrix of independent components at the nth sample point, a is a mixing matrix.
Separating matrix:
thus, the following matrix can be obtained:
y[n]=Wx[n] (3)
wherein,,
is an estimated independent component matrix, W is a separation matrix, A -1 Is a function of the estimated value of (2);
and a pulse signal coupling step:
thus, the AND is obtained by the following formulas i [n]Pulse signal coupling of abrupt voltage changea i [n]
A detection pulse signal calculation step:
is provided with
(5)
According to formula (3), there is obtained:
the above is Z-transformed and rewritten as follows:
and (3) with
Then, the calculated pulse signal of y n is the occurrence of voltage phase jump.
More specifically, the controller 2 in this embodiment may mainly be composed of DSP, FPGA, ARM, DSP is responsible for signal acquisition, processing and calculation, FPGA is responsible for pulse generation, and ARM is responsible for external management, communication and display.
The frequency of the pulse signal can be 5 k-10 kHz, so that the detection period is short, the detection of abnormal power supply within 1ms can be realized, and the efficiency is high. Fig. 6 is a waveform diagram of a detection result of a UPS device for voltage phase jump according to an embodiment of the present invention; at the moment of voltage phase abrupt change, abrupt change pulse appears in the detection signal, and the controller judges the power supply voltage phase abrupt change, so that after the voltage phase abrupt change is finished, the abnormal voltage can be judged rapidly.
As another aspect of the example, regarding the rapid determination method of voltage sag, the method may specifically include the steps of:
and a signal acquisition step:
collected power supply voltage signalU i Composition time lagDThe vectors of (2) are as follows:
wherein,,M=D+1, which is the dimension of x, is setD=15，x[n]Representing supply voltage signalsU i Vector of magnitudes;
vector decomposition step:
the vector is decomposed and expressed as the following formula:
x[n]=As[n] (2)
wherein { \displaypole s= (s_ {1}, \ldots, s_ { n }) { T }
Is a matrix of independent components at the nth sample point, a is a mixing matrix.
Separating matrix:
thus, the following matrix can be obtained:
y[n]=Wx[n] (3)
wherein,,
is an estimated independent component matrix, W is a separation matrix, A -1 Is a function of the estimated value of (2);
pulse signal coupling step
Thus, the AND is obtained by the following formulas i [n]Pulse signal coupling of abrupt voltage changea i [n]
Detecting pulse signal calculation step
Is provided with
(5)
According to formula (3), there is obtained:
the above is Z-transformed and rewritten as follows:
and (3) with
(8)
Then, the calculated pulse signal of y n is the voltage drop.
The frequency of the pulse signal can be 5 k-10 kHz, so that the detection period is short, the detection of abnormal power supply within 1ms can be realized, and the efficiency is high. Fig. 7 is a schematic diagram of a waveform of a detection result of a UPS device for voltage sag according to an embodiment of the present invention; at the moment of voltage drop, the detection signal generates drop pulse, and the controller judges the power supply voltage drop, so that the power supply voltage drop can be judged quickly after the drop is finished.
It will be appreciated that the above description of the case of a supply ac voltage anomaly is for example only and is not intended to limit embodiments of the present invention. For example, the supply ac voltage anomaly may also be a condition involving a sudden voltage rise, etc., which should be considered within the scope of embodiments of the present invention. Fig. 8 also provides a schematic diagram of a detection result waveform of the UPS device for voltage surge according to the embodiment of the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Those skilled in the art will appreciate that the present invention includes apparatuses related to performing one or more of the operations described herein. These devices may be specially designed and constructed for the required purposes, or may comprise known devices in general purpose computers. These devices have computer programs stored therein that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., a computer) readable medium or any type of medium suitable for storing electronic instructions and respectively coupled to a bus, including, but not limited to, any type of disk (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROMs (Read-Only memories), RAMs (Random Access Memory, random access memories), EPROMs (Erasable Programmable Read-Only memories), EEPROMs (Electrically Erasable Programmable Read-Only memories), flash memories, magnetic cards, or optical cards. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).
It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions can be implemented in a processor of a general purpose computer, special purpose computer, or other programmable data processing method, such that the blocks of the block diagrams and/or flowchart illustration are implemented by the processor of the computer or other programmable data processing method.
Those of skill in the art will appreciate that the various operations, methods, steps in the flow, acts, schemes, and alternatives discussed in the present invention may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed herein may be alternated, altered, rearranged, disassembled, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present invention may also be alternated, altered, rearranged, decomposed, combined, or deleted.
The foregoing is only a partial embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (6)
1. The utility model provides a UPS device of uninterrupted power supply, includes uninterrupted power source UPS branch road, bypass and controller, this UPS branch road and this bypass parallel connection, its characterized in that: the UPS branch circuit comprises: the input end of the rectifying unit is used for being connected with an alternating current power supply;
the input end of the inversion unit is connected to the output end of the rectification unit, and the output end is used for being connected with a load; a storage battery connected in parallel between the output end of the rectifying unit and the input end of the inverting unit; the bypass comprises: the two ends of the bypass switch are respectively used for connecting the alternating current power supply and the load; a controller connected to the bypass switch, the rectifying unit and the inverting unit, and configured to control the rectifying unit and the bypass switch to be turned on and the inverting unit to be turned off when the ac power supply is normal; or-when the ac power supply is abnormal, controlling to turn on the inverter unit and turn off the bypass switch and the rectifying unit, wherein the rectifying unit comprises a first IGBT, and the rectifying unit further comprises a second IGBT, an emitter of the first IGBT being connected to a collector of the second IGBT, and a collector of the first IGBT being connected to an emitter of the second IGBT, and a control electrode of the first IGBT and the second IGBT being connected to the controller; the controller is used for outputting control signals to the control poles of the first IGBT and the second IGBT so as to control the rectification unit to be turned on and the inversion unit to be turned off, or to control the rectification unit to be turned off and the inversion unit to be turned on; wherein the controller comprises: the PWM module is used for outputting a first PWM signal to the control electrode of the first IGBT and outputting a second PWM signal with the opposite phase to the first PWM signal to the control electrode of the second IGBT; the controller also comprises a detection module connected with the PWM module, the detection module is used for detecting whether alternating current power supply is abnormal or not, and the detection module comprises: a signal acquisition component for acquiring a vector of time delays made up of supply voltage signals; a vector decomposition component for decomposing the vector into a plurality of independent components corresponding to a plurality of sampling points; an abnormal component determination component for analyzing whether a first independent component of the plurality of independent components is coupled with a component of the power supply signal when the power supply voltage is abnormal, and if so, determining the first independent component as an abnormal independent component; the pulse signal determining component is used for calculating a pulse signal corresponding to the abnormal independent component and judging the moment of abnormality of the power supply voltage based on the calculated pulse signal; wherein, this detection module is used for carrying out the following steps:
step one, signal acquisition: collected power supply voltage signal U i The vector that makes up the time lag D is as follows:
where m=d+1, which is the dimension of x, is set to d=15, x [ n ]]Representing supply voltage signal U i Vector of magnitudes;
step two, vector decomposition:
the vector is decomposed and expressed as the following formula:
x[n]＝As[n] (2)
wherein { \displaypole s= (s_ {1}, \ldots, s_ { n }) { T } s [ n }]＝(s 1 [n]，s 2 [n]，...，s m [N]) T Is a matrix formed by independent components at the nth sampling point, A is a mixed matrix;
step three, separating the matrix:
thus, the following matrix can be obtained:
y[n]＝Wx[n] (3)
wherein y [ n ]]＝(y 1 [n]，y 2 [n]，...，y m [n]) T Is an estimated independent component matrix, W is a separation matrix, A -1 Is a function of the estimated value of (2);
step four, pulse signal coupling:
thus, by equation (4), the sum s is obtained i [n]A coupled with signals of abnormal voltage i [n]
Step five, detecting pulse signals and calculating:
is provided with
According to formula (3), there is obtained:
the following is rewritten by Z-transformation in the formula (6):
Y 1 [z]＝w 11 X[z]+w 12 X[z]z -1 (7)
and Y is equal to 2 [z]＝w 21 X[z]+w 22 X[z]z -1 (8)
The time corresponding to the calculated y < n > pulse signal is the time when the power supply voltage is abnormal.
2. The apparatus of claim 1, wherein the apparatus further comprises: and a direct current bus capacitor connected between the collector of the first IGBT and the emitter of the second IGBT.
3. The apparatus according to claim 2, characterized in that the apparatus comprises: and each phase of the three phases corresponding to the alternating current power supply is respectively provided with the direct current bus capacitor, the first IGBT and the second IGBT.
4. The apparatus of claim 1, wherein the PWM module comprises: a PWM signal generating component for generating a first PWM signal; and the inverting component is connected to the PWM signal generating component and is used for generating the second PWM signal according to the first PWM signal.
5. The apparatus of claim 1, wherein the PWM module comprises a field programmable gate array FGPA, and the detection module comprises a digital signal processing DSP chip.
6. The apparatus of any one of claims 1-5, wherein the ac power anomaly comprises one or more selected from the group consisting of: voltage phase jumps, voltage drops and/or voltage surges.
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