CN218678462U - Energy storage converter, energy storage system and new energy power generation system - Google Patents
Energy storage converter, energy storage system and new energy power generation system Download PDFInfo
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- CN218678462U CN218678462U CN202223155007.XU CN202223155007U CN218678462U CN 218678462 U CN218678462 U CN 218678462U CN 202223155007 U CN202223155007 U CN 202223155007U CN 218678462 U CN218678462 U CN 218678462U
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Abstract
The utility model provides an energy storage converter, energy storage system and new forms of energy power generation system, energy storage converter includes converter unit, first busbar switch, second busbar switch, first pre-charge unit and second pre-charge unit, and first busbar switch sets up in converter unit's direct current generating line, and second busbar switch sets up in converter unit's alternating current generating line; the first pre-charging unit is connected with the first bus switch in parallel, and the second pre-charging unit is connected with the second bus switch in parallel; the first pre-charging unit includes a first pre-charging switch and a first resistor connected in series, and the second pre-charging unit includes a second pre-charging switch and a second resistor connected in series. According to the utility model discloses an energy storage converter, energy storage system and new forms of energy power generation system have solved energy storage converter's application limitation and the poor problem of suitability, can improve energy storage converter to energy storage device's suitability to no matter whether energy storage device has initial energy storage, the homoenergetic realizes black start.
Description
Technical Field
The utility model relates to an electronic circuit technical field, concretely relates to energy storage deflector, energy storage system and new forms of energy power generation system.
Background
The Energy storage power station mainly comprises a battery container, an electric control container, a transformer and an Energy Management System (EMS). The Battery container is internally provided with a Battery and a Battery energy Management System (BMS), wherein the Battery is a carrier for storing energy, the BMS can monitor the temperature, the voltage and the like of the Battery cell and adopt a corresponding control algorithm to ensure the safe and effective operation of the Battery System, and the electric control container can complete the Conversion of direct current/alternating current energy and can comprise a Power Conversion System (PCS). After the power system is completely shut down due to faults, equipment such as a transformer substation, a wind generating set, a photovoltaic power generation unit and the like connected with the power system can be recovered to operate through the electrochemical energy storage power station with black start capability.
In the existing energy storage converter, the energy storage converter can only be started from the direct current side of the energy storage converter in the black start process, so that certain requirements exist on the initial energy storage of a battery connected to the energy storage converter, and under the condition that the battery does not have energy storage initially, the black start cannot be realized based on the energy storage converter. Therefore, the application of the existing energy storage converter has certain limitation and poor adaptability to batteries.
SUMMERY OF THE UTILITY MODEL
In view of the problem that current energy storage converter can only start from the direct current side and the application limitation and the suitability are poor, the utility model provides an energy storage converter, energy storage system and new forms of energy power generation system.
One aspect of the present invention provides an energy storage converter device, which includes a converter unit, a first bus switch, a second bus switch, a first pre-charge unit, and a second pre-charge unit, wherein the first bus switch is disposed on a dc bus of the converter unit, and the second bus switch is disposed on an ac bus of the converter unit; the first pre-charging unit is connected with the first bus switch in parallel, and the second pre-charging unit is connected with the second bus switch in parallel; the first pre-charging unit includes a first pre-charging switch and a first resistor connected in series, and the second pre-charging unit includes a second pre-charging switch and a second resistor connected in series.
Optionally, the energy storage converter device further includes a power supply system, where the power supply system includes an ac transformer and a rectifier, an input end of the ac transformer is connected to the ac bus of the converter unit to transform the ac power from the ac bus, and an input end of the rectifier is connected to an output end of the ac transformer to rectify the ac power from the ac transformer.
Optionally, the power supply system further comprises a voltage comparator connected to the output of the rectifier and the dc bus of the converter unit to compare a first dc power from the rectifier and a second dc power from the dc bus and output the greater of the first dc power and the second dc power.
Optionally, the power supply system further includes a plurality of dc transformers connected in parallel to the output terminal of the voltage comparator, and the plurality of dc transformers have different powers.
Optionally, the energy storage converter device further includes a filter, and the filter is connected to an ac side of the converter unit.
Another aspect of the present invention provides an energy storage system, the energy storage system includes at least one energy storage unit, the energy storage unit includes energy storage converter, at least one the energy storage converter of energy storage unit is according to the exemplary embodiment of the present invention energy storage converter.
Optionally, at least one energy storage unit includes parallel connection's first energy storage unit and second energy storage unit, first energy storage unit includes first energy storage conversion device, first energy storage conversion device be according to the utility model discloses an exemplary embodiment energy storage conversion device, the second energy storage unit include with the different second energy storage conversion device of first energy storage conversion device, second energy storage conversion device includes second conversion unit, dc bus switch and dc precharge unit, dc precharge unit with second energy storage conversion device's dc bus switch parallel connection, dc precharge unit includes series connection's dc precharge switch and dc precharge resistance.
Optionally, the first energy storage unit further includes a first energy storage device connected to a dc side of the first energy storage converter device, and the second energy storage unit further includes a second energy storage device connected to a dc side of the second energy storage converter device; the first energy storage device comprises a flow battery, and the second energy storage device comprises a lithium ion battery.
Optionally, the energy storage converter device includes a plurality of energy storage converter devices, each energy storage unit further includes a split transformer having a plurality of windings, and the plurality of energy storage converter devices are connected to the plurality of windings of the split transformer in a one-to-one correspondence manner.
A further aspect of the utility model provides a new forms of energy power generation system, new forms of energy power generation system includes according to the utility model discloses an exemplary embodiment energy storage system.
According to the utility model discloses an energy storage converter, energy storage system and new forms of energy power generation system are through first pre-charge unit and first bus switch parallel connection and the second is pre-charge unit and second bus switch parallel connection for direct current side and the interchange side homoenergetic from the converter unit can start, so, can improve energy storage converter to the suitability such as the energy memory of battery, thereby no matter whether energy memory has initial energy storage, the homoenergetic realizes black start-up.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein it is to be understood that the following drawings illustrate only certain embodiments of the invention and are, therefore, not to be considered limiting of its scope. In the drawings:
fig. 1 is a schematic diagram of a main circuit of an energy storage converter device according to an exemplary embodiment of the present invention.
Fig. 2 is an example topology of a main loop of an energy storage converter device according to an example embodiment of the present invention.
Fig. 3 is a schematic diagram of a power supply system of an energy storage converter device according to an exemplary embodiment of the present invention.
Fig. 4 is an example topology of a power supply system of an energy storage converter device according to an example embodiment of the present invention.
Fig. 5 is a schematic diagram of an energy storage system according to an exemplary embodiment of the present invention.
Fig. 6 is an example topology of an energy storage system according to an exemplary embodiment of the present invention.
The reference numbers illustrate:
110-a stream unit; 120-a first bus switch; 130-a second bus switch; 140-a first precharge unit; 150-a second precharge unit; 210-an alternating current transformer; 220-a rectifier; 230-a voltage comparator; 240-a direct current transformer; 11-a first component plate; 12-a second component plate; 13-a first voltage conversion plate; 14-a second voltage conversion plate; 15-a third voltage conversion plate; 1010-a first energy storage unit; 1011-a first energy storage converter device; 1012-a first energy storage device; 1020-a second energy storage unit; 1021-a second energy storage converter; 1022-a second energy storage device; 1030-a third energy storage unit; 1031-third energy storage converter device; 1032-a third energy storage device; 1040-incoming cabinet; 1050-a split transformer; 1060-high pressure chamber.
Detailed Description
The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, devices, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent to those skilled in the art in view of the disclosure of the present invention. For example, the order of operations described herein is merely an example, and is not limited to those set forth herein, but may be changed as will become apparent after understanding the present disclosure, except to the extent that operations must occur in a particular order. Moreover, descriptions of features known in the art may be omitted for clarity and conciseness.
The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, apparatus and/or systems described herein, which will be apparent after understanding the present disclosure.
As used herein, the term "and/or" includes any one of the associated listed items and any combination of any two or more.
Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, first component, first region, first layer, or first portion referred to in the examples described herein can also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.
In the specification, when an element (such as a layer, region or substrate) is described as being "on," "connected to" or "coupled to" another element, it can be directly on, connected to or coupled to the other element or one or more other elements may be present therebetween. In contrast, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there may be no intervening elements present.
The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The singular is also intended to include the plural unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, quantities, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and/or combinations thereof.
Unless otherwise defined, 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 after understanding the present invention. Unless explicitly defined as such herein, terms (such as those defined in general dictionaries) should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Further, in the description of the examples, when it is considered that detailed description of well-known related structures or functions will cause a vague explanation of the present invention, such detailed description will be omitted.
The following exemplary embodiments are presented to enable a person skilled in the art to make and use the teachings of the present invention, and may be combined in any suitable manner with specific application scenarios, specific system, device, and component parameters, and specific connection schemes. However, these embodiments are merely examples, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present invention.
Furthermore, in order to clearly show the relationship between components or the internal configuration, etc., in the drawings, components and structures, etc., which are not related to the described exemplary embodiments, such as the energy storage converter and the energy storage system, are omitted, and these omitted components and structures may be implemented in any form known to those skilled in the art.
An exemplary embodiment of the present invention provides an energy storage converter, an energy storage system and a new energy power generation system to at least solve or alleviate one of the problems described in the foregoing.
According to a first aspect of the present invention, an energy storage converter device is provided, and an example structure of the energy storage converter device according to an exemplary embodiment of the present invention will be described below with reference to fig. 1 to 4.
As shown in fig. 1 and 2, the energy storage converter device may include a converter unit 110, a first bus switch 120, a second bus switch 130, a first pre-charge unit 140, and a second pre-charge unit 150.
The converter unit 110 may be a DC/AC converter, an energy storage device such as a battery may be connected to a DC side of the converter unit 110, and the energy storage device may provide a DC power to the converter unit 110, or receive an AC power input from an AC side of the converter unit 110 and convert the DC power from the converter unit 110 for charging. The specific form of the energy storage device will be described in detail in the following description of the energy storage system.
The first bus switch 120 may be disposed on a dc bus of the converter unit 110, and the second bus switch 130 may be disposed on an ac bus of the converter unit 110. As an example, the first bus bar switch 120 may be a dc contactor K1 shown in fig. 2, and the second bus bar switch 130 may be an ac contactor K3 shown in fig. 2, however, the first bus bar switch 120 and the second bus bar switch 130 are not limited thereto, and an appropriate switching device may be selected according to actual needs as long as it is a device capable of switching on and off a circuit.
First pre-charge unit 140 may be connected in parallel with first bus switch 120 and second pre-charge unit may be connected in parallel with second bus switch 130.
Specifically, the first pre-charge unit 140 may include a first pre-charge switch and a first resistor connected in series, and the second pre-charge unit 150 may include a second pre-charge switch and a second resistor connected in series. Here, the first resistor may be a resistor R1 shown in fig. 2, and the second resistor may be resistors R2 and R3 shown in fig. 2, and as shown in fig. 2, the resistor R2 may be connected in parallel to the a phase of the ac bus, and the resistor R3 may be connected in parallel to the C phase of the ac bus. The first pre-charge switch may be dc contactor K2 shown in fig. 2, the second pre-charge switch may be ac contactor K4 shown in fig. 2, and the coils of ac contactor K4 may be wired to phases a and C of the ac bus. However, the first precharge switch and the second precharge switch are not limited thereto, and an appropriate switching device may be selected according to actual needs as long as it is a device capable of switching on and off a circuit.
According to the utility model discloses an exemplary embodiment all is provided with the unit of precharging parallelly connected with the generating line in the direct current side and the interchange side of conversion unit to make the direct current side and the interchange side homoenergetic from conversion unit start, so, can improve energy storage converter to the suitability of energy memory such as battery, thereby no matter whether energy memory has initial energy storage, the homoenergetic realizes black start.
In addition, as shown in fig. 2, the energy storage converter device may further include a dc breaker F1 and an ac breaker F2. The dc breaker F1 may be disposed on the dc side of the converter unit 110, for example, between the dc port of the energy storage converter and the first bus switch 120. The ac breaker F2 may be disposed on the ac side of the converter unit 110, for example, between the ac port of the energy storage converter and the second bus switch 130. The direct current breaker F1 and the alternating current breaker F2 can limit the current of the circuit so as to avoid the current overload of a direct current bus and an alternating current bus of the energy storage converter device and the like.
In addition, the energy storage converter device may further include a filter, and the filter is connected to the ac side of the converter unit 110, as shown in fig. 2, and the filter may include a reactor L and a capacitor C.
According to the exemplary embodiment of the present invention, the energy storage converter device may further include a power supply system, and the power supply system may obtain power from the dc side and the ac side of the converter unit 110 to supply power to the load connected to the power supply system.
As shown in fig. 3 and 4, the power supply system may include an ac transformer 210 and a rectifier 220. An input terminal of the ac transformer 210 may be connected to an ac bus of the converter unit 110 to transform ac power from the ac bus, and an input terminal of the rectifier 220 may be connected to an output terminal of the ac transformer to rectify ac power from the ac transformer.
Specifically, as shown in fig. 3 and 4, the ac transformer 210 may include two outputs, one of which may be ac-powered for loads such as the lighting lamp H1 and the dehumidifier U1 or output 220V ac, and the other of which may be input to the rectifier 220. As such, in one example, the dc load and the ac load may be powered by the dc output of the rectifier and the ac output of the ac transformer, respectively.
Further, in another example, the power supply system may further include a voltage comparator 230, and the voltage comparator 230 may be connected to the output terminal of the rectifier 220 and the dc bus of the inverter unit 110 to compare the first dc power from the rectifier 220 and the second dc power from the dc bus and output the greater of the first dc power and the second dc power.
In this manner, a dc load may be powered by the greater of the dc output from rectifier 220 and the dc output from the dc bus. Here, the dc load may be, for example, a control system of the energy storage converter device, such as a pre-charging switch. At the initial stage of performing the black start, the dc side of the converter unit 110 is powered (i.e. the dc power from the energy storage device connected to the converter unit 110, such as a battery), and the ac side of the converter unit 110 is not yet started, so the voltage comparator 230 can output the electric energy from the dc bus of the converter unit 110 (i.e. the electric energy from the energy storage device) as the larger one, so as to supply power to the control system of the energy storage converter device, so as to control the energy storage converter device to perform the subsequent black start action through the control system.
As shown in fig. 3, the power supply system may further include a plurality of dc transformers 240, the plurality of dc transformers 240 may be connected to the output terminal of the voltage comparator 230 in parallel, the dc transformers may step down the dc power received from the voltage comparator 230, the power of the plurality of dc transformers 240 may be different, and thus, the output voltages of the plurality of dc transformers 240 may be different, for example, as shown in fig. 4, the output voltages of the plurality of dc transformers 240 may be 24V, 15V, and 220V, respectively.
As an example, the direct current transformer may be formed as an on-board power supply, but it is not limited thereto, and it may be provided according to actual needs as long as a device capable of DC/DC voltage conversion is realized.
Further, as shown in fig. 4, an ac transformer 210 may be provided on the first component board 11, and the ac transformer 210 may be wired to the a-phase and B-phase outputs of the ac bus of the inverter unit 110. A rectifier 220 and a voltage comparator 230 may be provided on the second component board 12, the rectifier 220 may be wired to the DC + and DC-outputs of the DC bus of the converter unit 110. A plurality of dc transformers 240 may be provided on the first voltage conversion plate 13, the second voltage conversion plate 14, and the third voltage conversion plate 15, respectively.
Further, the input side of the voltage comparator 230 may be provided with a breaker Q1, the input side of the ac transformer 210 may be provided with a breaker Q2, and the ac busbars of the illumination lamp H1 and the dehumidifier U1 may be provided with a breaker F3 and a breaker F4, respectively. Through setting up above-mentioned circuit breaker, can carry out the current-limiting to corresponding circuit to avoid line current to transship. Further, in the example of FIG. 4, all circuits may take 1mm 2 Is implemented by the lead wires of (1).
Based on the energy storage converter, after the power system is completely shut down due to faults, the power supply system of the energy storage converter can obtain power from the direct current side on the premise that the energy storage device (such as a battery) of the energy storage power station is powered, and the power is obtained from the energy storage device (such as a battery) connected with the energy storage converter, so that the control system of the energy storage converter is electrified. After the control system of the energy storage converter device is electrified, the first pre-charging switch can be turned on, for example, the pre-charging contactor K2 is sequentially attracted to perform pre-charging on the dc side. After the direct-current side pre-charging is finished, the first bus switch (for example, the contactor K1) and the second bus switch (for example, the contactor K3) can be turned on, so that the converter unit starts to modulate, the alternating-current side voltage of the converter unit gradually rises to the grid voltage, and after the alternating-current side voltage is stabilized, the power supply system of the energy storage converter device can be powered from the alternating-current side, so that the consumption of the battery energy is reduced, and the battery under-voltage is favorably avoided.
According to a second aspect of the present invention, an energy storage system is provided, and an example structure of the energy storage system of an exemplary embodiment of the present invention will be described below with reference to fig. 5 and 6.
According to an exemplary embodiment of the present invention, the energy storage system may include at least one energy storage unit, each energy storage unit may include an energy storage converter, and the energy storage converter of the at least one energy storage unit of the energy storage system may be the energy storage converter according to the exemplary embodiment of the present invention.
Fig. 5 and 6 show a schematic structural diagram of an example of an energy storage system according to an exemplary embodiment of the present invention. As shown in fig. 5 and 6, the energy storage system may include a first energy storage unit 1010 and a second energy storage unit 1020 connected in parallel.
The first energy storage unit 1010 may comprise a first energy storage converter 1011, where the first energy storage converter 1011 may be the energy storage converter according to the exemplary embodiment of the present invention described above with reference to fig. 1 to 4. The second energy storage unit 1020 may comprise a second energy storage and conversion device 1021 different from the first energy storage and conversion device 1011.
In this embodiment, the second energy storing unit 1020 may have a precharge unit only on the dc side of the dc side and the ac side. Specifically, the second energy storage converter 1021 may include a second converter unit, a dc bus switch, and a dc pre-charge unit, where the dc pre-charge unit may be connected in parallel with the dc bus switch of the second energy storage converter 1021, and the dc pre-charge unit may include a dc pre-charge switch and a dc pre-charge resistor connected in series. For example, the dc pre-charge unit of the second energy storage converter 1021 may be similar to the structure of the first pre-charge unit 140 of the energy storage converter described above with reference to fig. 1 and fig. 2, and is not described herein again.
In the energy storage system according to the utility model, first energy storage converter 1011 can start from the direct current side and the interchange side homoenergetic, and second energy storage converter 1021 only can start from the direct current side, so, at the in-process that black starts, can make second energy storage converter start from the direct current side earlier to the alternating current that will come from second energy storage converter provides first energy storage converter 1011, makes first energy storage converter 1011 start from the interchange side, thereby realizes the start-up of entire system.
The first energy storage unit 1010 may further include a first energy storage device 1012 connected to the dc side of the first energy storage converter 1011, and the second energy storage unit 1020 further includes a second energy storage device 1022 connected to the dc side of the second energy storage converter 1021. Here, since the first energy storage converter 1011 can be started from both the dc side and the ac side, the first energy storage device 1012 may be an energy storage device without initial energy storage, and the second energy storage device 1022 may be an energy storage device with initial energy storage, so that the second energy storage converter may be started from the dc side by the second energy storage device 1022 first, and then ac power from the second energy storage converter is provided to the first energy storage converter 1011 to charge the first energy storage device 1012, so that the first energy storage device 1012 can support the first energy storage converter 1011 to be started from the dc side in subsequent use.
As an example, the first energy storage device 1012 may include a flow battery such as a vanadium flow battery, and the second energy storage device 1022 may include a lithium ion battery. Specifically, a flow battery such as a vanadium flow battery has no energy storage capacity at the time of initial installation due to its battery configuration, and therefore it is necessary to allow the first energy storage converter 1011 to be started from the ac side to charge the battery; and the lithium ion battery has electric energy storage during initial installation, so that the electric energy of the lithium ion battery can be provided to the alternating current side of the second energy storage device 1022 by starting the second energy storage device 1022 from the direct current side, and because the first energy storage unit 1010 is connected in parallel with the second energy storage unit 1020, the electric energy from the lithium ion battery can be provided to the alternating current side of the first energy storage device 1012 from the alternating current side of the second energy storage device 1022, so that the first energy storage device 1012 can be started from the alternating current side, and the initial charging of the flow battery is realized.
Here, as shown in fig. 5, the first energy storage unit 1010 may include one or more first energy storage conversion devices 1011 and a corresponding first energy storage device 1012, and the second energy storage unit 1020 may include one or more second energy storage conversion devices 1021 and a corresponding second energy storage device 1022.
In addition, the energy storage system may further include a third energy storage unit 1030, where the third energy storage unit 1030 may include a third energy storage and conversion device 1031 and a corresponding third energy storage device 1032, and the third energy storage and conversion device 1031 may be the same as the first energy storage and conversion device 1011 or the second energy storage and conversion device 1021. The first 1010, second 1020 and third 1030 energy storage units may be connected to an ac bus of the power system, such as 35kV, in a service cabinet 1040.
Furthermore, according to the exemplary embodiment of the present invention, the energy storage converter device in each energy storage unit may be multiple, each energy storage unit may further include a split transformer 1050 having multiple windings, and the multiple energy storage converter devices are connected to the multiple windings of the split transformer in a one-to-one correspondence manner. As shown in fig. 6, the first energy storage unit 1010, the second energy storage unit 1020, and the third energy storage unit 1030 may respectively include two energy storage converters, and accordingly, the split transformer of each energy storage unit may be a double split transformer. The split transformer 1050 may convert the voltage from the energy storage unit to an ac bus voltage of the power system, for example from 690VAC to 35kVAC. Furthermore, in the example of fig. 6, the rated power and the rated energy storage capacity of the first energy storage unit 1010, the second energy storage unit 1020, and the third energy storage unit 1030 may each be 3.5MW/7.434MWh.
Furthermore, as shown in fig. 6, the energy storage system may further include a high voltage chamber 1060, and the high voltage chamber 1060 may protect the grid side high voltage of the power system.
It should be noted that, although fig. 5 and 6 show that the energy storage system includes three energy storage units, the present invention is not limited thereto, and the energy storage system may further include more energy storage units.
It should also be noted that, although it is described above that the first energy storage unit and the second energy storage unit of the energy storage system include different first energy storage conversion devices and second energy storage conversion devices, it is not limited thereto, and all energy storage units of the energy storage system may also include the same energy storage conversion device, for example, each energy storage unit includes a first energy storage conversion device having both a dc-side first pre-charge unit and an ac-side second pre-charge unit.
An example process for performing a black start of an energy storage plant using an energy storage system as shown in fig. 5 and 6 will be described in detail below.
As described above in the description of the energy storage converter device, after the power system is completely shut down due to a fault, the power supply system of the energy storage converter device may take power from the dc side, which is taken from the energy storage device (e.g. battery) connected to the energy storage converter device, on the premise that the energy storage device (e.g. battery) of the energy storage power station has power, so as to charge the control system of the energy storage converter device. After the control system of the energy storage converter device is electrified, the first pre-charging switch can be turned on, for example, the pre-charging contactor K2 is sequentially attracted to perform pre-charging on the dc side. After the direct-current side pre-charging is finished, the first bus switch (for example, the contactor K1) and the second bus switch (for example, the contactor K3) can be turned on, so that the converter unit starts to modulate, the alternating-current side voltage of the converter unit gradually rises to the grid voltage, and after the alternating-current side voltage is stabilized, the power supply system of the energy storage converter device can be powered from the alternating-current side, so that the consumption of the battery energy is reduced, and the battery under-voltage is favorably avoided.
In the case that the energy storage system includes the first energy storage unit 1010, the second energy storage unit 1020, and the third energy storage unit 1030, the first energy storage unit 1010 may include the first energy storage converter device 1011 as described above, the second energy storage unit 1020 may include the second energy storage converter device 1021 as described above, and the third energy storage converter device 1031 of the third energy storage unit 1030 may be the same as the first energy storage converter device 1011.
Based on the energy storage system, black start may be performed on the second energy storage unit 1020 from the dc side, so that the second energy storage and conversion device 1021 in the second energy storage unit 1020 performs ac bus voltage establishment, so that the first energy storage and conversion device 1011 and the third energy storage and conversion device 1031 in the first energy storage unit 1010 start to start, the first energy storage and conversion device 1011 and the third energy storage and conversion device 1031 supply power to the control system of the energy storage and conversion device from the ac side, after the control system is electrified, the second precharge switches of the first energy storage and conversion device 1011 and the third energy storage and conversion device 1031 may be turned on, for example, the ac side precharge contactor K4 shown in fig. 2 is sequentially attracted, so as to complete ac side precharge by using the ac side precharge contactor K4, the precharge resistors R2 and R3, after ac side precharge is completed, the first and second precharge switches of the first energy storage and conversion device 1011 and the third energy storage and conversion device 1031 may be turned on, for example, the contactor K3, the contactor K2 and the contactor K1 shown in fig. 2 are sequentially attracted, so as to start bus modulation. Therefore, the second energy storage converter 1021 in the second energy storage unit 1020 can start from the dc side, and then the energy storage converters in the first energy storage unit 1010 and the third energy storage unit 1030 can start from the ac side, so that the black start of the whole energy storage system can be realized.
Taking the energy storage power station of 10MW/10MWh in fig. 2 as an example, after the power system is shut down, the second energy storage unit 1020 may perform black start, and after the black start is finished and the ac side voltage is established, the first energy storage unit 1010 and the third energy storage unit 1030 may be sequentially started, at this time, since the 35KV high-voltage side is already charged, the load of the booster station may be started, so that the whole power station is in an operating state. In the above process, the second energy storage unit 1020 may operate in a voltage/Frequency (VF) control mode, which may be used as a voltage source; one part of the first energy storage unit 1010 and the third energy storage unit 1030 may operate in a VF control mode (for example, the control manner may adopt droop control) to support the voltage source capacity, and another part thereof may operate in a constant Power (PQ) control mode to balance the active power and the reactive power of other devices of the energy storage power station.
Although it is described above that the second energy storage unit 1020 may include the second energy storage and conversion device 1021, it is not limited thereto, and the second energy storage unit 1020 may also include the same energy storage and conversion device as the first energy storage unit 1010 and the third energy storage unit 1030, for example, the first energy storage and conversion device 1011.
Furthermore, another aspect of the present invention provides a new energy power generation system, which may include an energy storage system according to the exemplary embodiment of the present invention. Here, the new energy power system may be, for example, but not limited to, a wind farm, a photovoltaic farm, or the like.
According to the utility model discloses an energy storage system and new forms of energy power generation system can accomplish entire system's black start through some energy storage unit among the energy storage system, allows the energy memory of another part energy storage unit adoption no initial energy storage, provides higher flexibility and compatibility for energy storage system's constitution.
Although the circuits, devices, and modules shown in the above exemplary embodiments may be formed in any manner known to those skilled in the art as long as they can achieve the corresponding functions.
Although exemplary embodiments of the present invention have been described in detail above, those skilled in the art may make various modifications and alterations to the embodiments of the present invention without departing from the spirit and scope of the present invention. It should be understood that modifications and variations may occur to those skilled in the art, which would still fall within the spirit and scope of the exemplary embodiments of the invention as defined by the appended claims.
Claims (10)
1. An energy storage converter device is characterized in that the energy storage converter device comprises a converter unit, a first bus switch, a second bus switch, a first pre-charging unit and a second pre-charging unit,
the first bus switch is arranged on a direct current bus of the converter unit, and the second bus switch is arranged on an alternating current bus of the converter unit;
the first pre-charging unit is connected with the first bus switch in parallel, and the second pre-charging unit is connected with the second bus switch in parallel;
the first pre-charging unit includes a first pre-charging switch and a first resistor connected in series, and the second pre-charging unit includes a second pre-charging switch and a second resistor connected in series.
2. The energy-storage converter device according to claim 1, wherein the energy-storage converter device further comprises a power supply system,
the power supply system comprises an alternating current transformer and a rectifier, wherein the input end of the alternating current transformer is connected to an alternating current bus of the converter unit so as to transform alternating current from the alternating current bus, and the input end of the rectifier is connected to the output end of the alternating current transformer so as to rectify the alternating current from the alternating current transformer.
3. The energy storage converter device of claim 2, wherein the power supply system further comprises a voltage comparator connected to the output of the rectifier and the dc bus of the converter unit for comparing a first dc power from the rectifier with a second dc power from the dc bus and outputting the greater of the first dc power and the second dc power.
4. The energy storage converter device according to claim 3, wherein the power supply system further comprises a plurality of DC transformers, the plurality of DC transformers are connected in parallel to the output end of the voltage comparator, and the power of the plurality of DC transformers is different.
5. The energy storage converter device of claim 1, further comprising a filter connected to an ac side of the converter cell.
6. An energy storage system, characterized in that the energy storage system comprises at least one energy storage unit, the energy storage unit comprises an energy storage converter device, and the energy storage converter device of at least one of the energy storage units is the energy storage converter device according to any one of claims 1 to 5.
7. The energy storage system of claim 6, wherein the at least one energy storage unit comprises a first energy storage unit and a second energy storage unit connected in parallel,
the first energy storage unit comprises a first energy storage converter device, the first energy storage converter device is the energy storage converter device according to any one of claims 1 to 5,
the second energy storage unit comprises a second energy storage converter device different from the first energy storage converter device, the second energy storage converter device comprises a second converter unit, a direct current bus switch and a direct current pre-charging unit, the direct current pre-charging unit is connected with the direct current bus switch of the second energy storage converter device in parallel, and the direct current pre-charging unit comprises a direct current pre-charging switch and a direct current pre-charging resistor which are connected in series.
8. The energy storage system of claim 7, wherein the first energy storage unit further comprises a first energy storage device connected to a dc side of the first energy storage inverter, and the second energy storage unit further comprises a second energy storage device connected to a dc side of the second energy storage inverter;
the first energy storage device comprises a flow battery, and the second energy storage device comprises a lithium ion battery.
9. The energy storage system of claim 6, wherein the energy storage converter comprises a plurality of energy storage converters, each energy storage unit further comprises a split transformer having a plurality of windings, and the plurality of energy storage converters are connected with the plurality of windings of the split transformer in a one-to-one correspondence.
10. A new energy power generation system, characterized in that it comprises an energy storage system according to any one of claims 6 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117154139A (en) * | 2023-10-27 | 2023-12-01 | 福建星云电子股份有限公司 | Flow battery activation device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117154139A (en) * | 2023-10-27 | 2023-12-01 | 福建星云电子股份有限公司 | Flow battery activation device and method |
| CN117154139B (en) * | 2023-10-27 | 2024-02-06 | 福建星云电子股份有限公司 | Flow battery activation device and method |
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Effective date of registration: 20230519 Address after: Building 1, No. 8 Boxing 1st Road, Beijing Economic and Technological Development Zone, Daxing District, Beijing, 100176 (Yizhuang Cluster, High end Industrial Zone, Beijing Pilot Free Trade Zone) Patentee after: Beijing Jinfeng Zero Carbon Energy Co.,Ltd. Address before: 100176 Building 1, 8 boxing 1st Road, Beijing Economic and Technological Development Zone, Daxing District, Beijing Patentee before: BEIJING ETECHWIN ELECTRIC Co.,Ltd. |