Cascaded energy storage pcs charge-discharge pair test device

Abstract

The utility model discloses a cascade energy storage PCS charges and discharges to draw a test device, including test platform, first charge and discharge power module, second charge and discharge power module, transformer module, current detection module, first temperature detection module, second temperature detection module and control module, first charge and discharge power module is used for with the direct current end connection of first PCS subassembly, second charge and discharge power module is used for with the direct current end connection of second PCS subassembly, transformer module includes the first winding and second winding of mutual coupling, the first winding is used for with the alternating current end connection of first PCS subassembly, and the second winding is used for with the alternating current end connection of second PCS subassembly, and control module is used for with the controlled end of first PCS subassembly and the controlled end of second PCS subassembly respectively connects, and control module is connected with current detection module, first temperature detection module and second temperature detection module respectively, and the design fast and reliable detection performance situation of PCS subassembly, guarantees that PCS subassembly runs stably reliable.

Description

Technical Field

[0001] This utility model relates to the field of power electronic equipment technology, and in particular to a cascaded energy storage PCS charging and discharging test device. Background Technology

[0002] Under the "dual carbon" goal, the construction of new power systems represented by wind power and photovoltaics is accelerating. As the basic unit for power conversion in the power system, energy storage PCS typically has a dozen or even dozens of units in one device. It can be applied to multiple voltage levels, can be flexibly added or removed, and is convenient and reliable to use.

[0003] However, as the number of cascaded energy storage PCS units increases, the probability of failure also increases accordingly. Once an energy storage PCS unit fails, it causes distortion in the AC output current and affects the normal operation of non-faulty energy storage PCS units, further impacting the stable operation of the cascaded power system. Currently, there is no reliable testing equipment capable of quickly inspecting energy storage PCS units, resulting in low efficiency in troubleshooting and failing to meet current development needs. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a cascaded energy storage PCS charge-discharge test device, which can quickly and reliably detect the performance of PCS modules and ensure the stable and reliable operation of PCS modules.

[0005] A cascaded energy storage PCS charge-discharge test device according to a first aspect embodiment of the present invention includes: a test platform with a first test station and a second test station, the first test station being used to mount a first PCS component and the second test station being used to mount a second PCS component; a first charge-discharge power supply module and a second charge-discharge power supply module, both mounted on the test platform, the first charge-discharge power supply module being used to connect to the DC terminal of the first PCS component and the second charge-discharge power supply module being used to connect to the DC terminal of the second PCS component; and a transformer module mounted on the test platform, the transformer module including a first winding and a second winding coupled to each other, the first winding being used to connect to the AC terminal of the first PCS component. The second winding is used to connect to the AC terminal of the second PCS component; a current detection module is set on the test platform, and the current detection module is connected to the first winding or the second winding to detect the test current; a first temperature detection module and a second temperature detection module are set at the first test station to detect the first operating temperature of the first PCS component, and the second temperature detection module is set at the second test station to detect the second operating temperature of the second PCS component; a control module is used to connect to the controlled terminal of the first PCS component and the controlled terminal of the second PCS component respectively, and the control module is connected to the current detection module, the first temperature detection module and the second temperature detection module respectively.

[0006] The cascaded energy storage PCS charge-discharge test device according to the embodiments of this utility model has at least the following beneficial effects:

[0007] This utility model relates to a cascaded energy storage PCS charge / discharge parallel testing device. When performance testing of the first and second PCS components is required, the first PCS component can be placed at the first testing station, and the second PCS component at the second testing station. The control module controls the operation of the first and second PCS components. In one testing phase, the first charge / discharge power module can discharge the first PCS component, which is then transformed by the transformer module and rectified by the second PCS component to charge the second charge / discharge power module. In another testing phase, the second charge / discharge power module can also discharge the second PCS component, which is then transformed by the transformer module and rectified by the first PCS component to charge the first charge / discharge power module. Regardless of the testing phase, the current detection module can detect the test current, and the first temperature detection module detects the first operating temperature of the first PCS component, while the second temperature detection module detects the second operating temperature of the second PCS component. Users can use this data to analyze whether the PCS component is faulty. This design quickly and reliably detects the performance of the PCS components, ensuring stable and reliable operation of the PCS components.

[0008] According to some embodiments of the present invention, the control module includes a synchronous coordinated wave transmission module, a first main control module, and a second main control module. The first main control module is used to connect to the controlled end of the first PCS component, and the second main control module is used to connect to the controlled end of the second PCS component. The synchronous coordinated wave transmission module is connected to the first main control module and the second main control module respectively to output a wave transmission control signal.

[0009] According to some embodiments of the present invention, the synchronous coordination wave transmission module is connected to the first main control module and the second main control module respectively via optical fiber communication cables.

[0010] According to some embodiments of this utility model, the cascaded energy storage PCS charge-discharge test device further includes a water-cooled module, a cold water pipe, and a hot water pipe. The cold water output terminal of the water-cooled module is connected to the cold water pipe, and the hot water input terminal of the water-cooled module is connected to the hot water pipe. The cold water pipe is connected to the first cold water input terminal of the first heat exchanger in the first PCS assembly and the second cold water input terminal of the second heat exchanger in the second PCS assembly. The hot water pipe is connected to the first hot water output terminal of the first heat exchanger in the first PCS assembly and the second hot water output terminal of the second heat exchanger in the second PCS assembly.

[0011] According to some embodiments of this utility model, the cascaded energy storage PCS charge-discharge test device further includes a first flow meter and a second flow meter. The first flow meter is disposed in the connecting pipe between the cold water pipe and the first cold water input end or in the connecting pipe between the hot water pipe and the first hot water output end. The second flow meter is disposed in the connecting pipe between the cold water pipe and the second cold water input end or in the connecting pipe between the hot water pipe and the second hot water output end. The control module is connected to the first flow meter and the second flow meter respectively.

[0012] According to some embodiments of this utility model, the cascaded energy storage PCS charge-discharge test device further includes a first inlet water temperature measuring module and a first outlet water temperature measuring module. The first inlet water temperature measuring module is disposed in the connecting pipe between the cold water pipe and the first cold water input terminal to detect the first inlet water temperature. The first outlet water temperature measuring module is disposed in the connecting pipe between the hot water pipe and the first hot water output terminal to detect the first outlet water temperature. The control module is connected to the first inlet water temperature measuring module and the first outlet water temperature measuring module respectively.

[0013] According to some embodiments of this utility model, the cascaded energy storage PCS charge-discharge test device further includes a second inlet water temperature measuring module and a second outlet water temperature measuring module. The second inlet water temperature measuring module is disposed in the connecting pipe between the cold water pipe and the second cold water input terminal to detect the second inlet water temperature. The second outlet water temperature measuring module is disposed in the connecting pipe between the hot water pipe and the second hot water output terminal to detect the second outlet water temperature. The control module is connected to the second inlet water temperature measuring module and the second outlet water temperature measuring module respectively.

[0014] According to some embodiments of the present invention, the first PCS component includes a first power conversion module and a second power conversion module. The AC terminal of the first power conversion module and the AC terminal of the second power conversion module are connected in series to form the AC terminal of the first PCS component. The DC terminal of the first power conversion module forms one of the DC terminals of the first PCS component, and the DC terminal of the second power conversion module forms the other DC terminal of the first PCS component.

[0015] According to some embodiments of the present invention, there are at least two first charging and discharging power supply modules, one of which is connected to the DC terminal of the first power conversion module, and the other is connected to the DC terminal of the second power conversion module.

[0016] According to some embodiments of this utility model, the first power conversion module includes switching transistors Q1, Q2, Q3, and Q4, a bypass switch K1, capacitors C1 and C2, inductor L1, and inductor L2. The input terminal of switching transistor Q1 is connected to the input terminal of switching transistor Q3, the first end of capacitor C1, and the first end of inductor L2, forming one pole of the DC terminal of the first power conversion module. The output terminal of switching transistor Q1 is connected to the input terminal of switching transistor Q2 and the first end of bypass switch K1, forming one pole of the DC terminal of the first power conversion module. One phase of the AC terminal of the first power conversion module is formed. The output terminal of the switch Q2 is connected to the output terminal of the switch Q4, the tail end of the capacitor C1, and the head end of the inductor L1. The tail end of the inductor L1 is connected to the head end of the capacitor C2 and forms the other pole of the DC terminal of the first power conversion module. The tail end of the inductor L2 is connected to the tail end of the capacitor C2. The output terminal of the switch Q3 is connected to the input terminal of the switch Q4 and the tail end of the bypass switch K1 and forms the other phase of the AC terminal of the first power conversion module.

[0017] Additional aspects and advantages of this 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. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the principle structure of one embodiment of the cascaded energy storage PCS charge-discharge test device of this utility model;

[0020] Figure 2 This is a circuit diagram of the first PCS component;

[0021] Figure 3 This is a circuit diagram of one embodiment of the cascaded energy storage PCS charging and discharging test device of this utility model.

[0022] Figure label:

[0023] First PCS component 100; First heat exchanger 110; First power conversion module 120; Second power conversion module 130; Second PCS component 200; Second heat exchanger 210; First charge / discharge power supply module 310; Second charge / discharge power supply module 320; Transformer module 330; First winding 331; Second winding 332; Current detection module 340; First temperature detection module 350; Second temperature detection module 360; Control module 400; Synchronous coordination wave generation module 410; First main control module 420; Second main control module 430; Water cooling module 500; Cold water pipe 510; Hot water pipe 520; First flow meter 610; Second flow meter 620; First inlet water temperature measurement module 630; First outlet water temperature measurement module 640; Second inlet water temperature measurement module 650; Second outlet water temperature measurement module 660. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figures 1 to 3As shown, the cascaded energy storage PCS charge-discharge countermeasure test device according to a first aspect embodiment of the present invention includes a test platform, a first charge-discharge power module 310, a second charge-discharge power module 320, a transformer module 330, a current detection module 340, a first temperature detection module 350, a second temperature detection module 360, and a control module 400. The test platform is provided with a first test station and a second test station. The first test station is used to place the first PCS component 100, and the second test station is used to place the second PCS component 200. The first charge-discharge power module 310 and the second charge-discharge power module 320 are both disposed on the test platform. The first charge-discharge power module 310 is used to connect to the DC terminal of the first PCS component 100, and the second charge-discharge power module 320 is used to connect to the DC terminal of the second PCS component 200. The transformer module 330 is disposed on the test platform, and the transformer module 330 includes mutually A first winding 331 and a second winding 332 are coupled together. The first winding 331 is used to connect to the AC terminal of the first PCS component 100, and the second winding 332 is used to connect to the AC terminal of the second PCS component 200. A current detection module 340 is disposed on the test platform and is connected to either the first winding 331 or the second winding 332 to detect the test current. A first temperature detection module 350 is disposed at the first test station to detect the first operating temperature of the first PCS component 100, and a second temperature detection module 360 ​​is disposed at the second test station to detect the second operating temperature of the second PCS component 200. A control module 400 is used to connect to the controlled terminals of the first PCS component 100 and the second PCS component 200, respectively. The control module 400 is connected to the current detection module 340, the first temperature detection module 350, and the second temperature detection module 360, respectively.

[0029] The first PCS component 100 includes at least a first power conversion module 120 and a second power conversion module 130. The AC terminal of the first power conversion module 120 and the AC terminal of the second power conversion module 130 are connected in series to form the AC terminal of the first PCS component 100. The DC terminal of the first power conversion module 120 forms one of the DC terminals of the first PCS component 100, and the DC terminal of the second power conversion module 130 forms the other DC terminal of the first PCS component 100.

[0030] Specifically, the first power conversion module 120 includes switching transistors Q1, Q2, Q3, and Q4, a bypass switch K1, capacitors C1 and C2, inductors L1 and L2. The input terminal of switching transistor Q1 is connected to the input terminal of switching transistor Q3, the first end of capacitor C1, and the first end of inductor L2, forming one pole of the DC terminal of the first power conversion module 120. The output terminal of switching transistor Q1 is connected to the input terminal of switching transistor Q2 and the first end of bypass switch K1, forming the first power conversion module 120. One phase of the AC terminal of the power conversion module 120, the output terminal of the switch Q2 is connected to the output terminal of the switch Q4, the tail end of the capacitor C1 and the head end of the inductor L1 respectively, the tail end of the inductor L1 is connected to the head end of the capacitor C2 and forms the other pole of the DC terminal of the first power conversion module 120, the tail end of the inductor L2 is connected to the tail end of the capacitor C2, and the output terminal of the switch Q3 is connected to the input terminal of the switch Q4 and the tail end of the bypass switch K1 respectively and forms the other phase of the AC terminal of the first power conversion module 120.

[0031] Switches Q1, Q2, Q3, and Q4 can all be MOSFETs or IGBTs. Inductor L2 and capacitor C2 form a resonant filter to ensure smooth and reliable power transmission.

[0032] Similarly, the second power conversion module 130 includes switching transistors Q5, Q6, Q7, and Q8, a bypass switch K2, capacitors C3 and C4, inductors L3 and L4. The input terminal of switching transistor Q5 is connected to the input terminal of switching transistor Q7, the first end of capacitor C3, and the first end of inductor L4, forming one pole of the DC terminal of the second power conversion module 130. The output terminal of switching transistor Q5 is connected to the input terminal of switching transistor Q6 and the first end of bypass switch K2, forming the second power conversion module 130. One phase of the AC terminal of the power conversion module 130 is connected to the output terminal of the switch Q6, the tail end of the capacitor C3, and the head end of the inductor L3. The tail end of the inductor L3 is connected to the head end of the capacitor C4 and forms the other pole of the DC terminal of the second power conversion module 130. The tail end of the inductor L4 is connected to the tail end of the capacitor C4. The output terminal of the switch Q7 is connected to the input terminal of the switch Q8 and the tail end of the bypass switch K2 and forms the other phase of the AC terminal of the second power conversion module 130.

[0033] One phase of the AC terminal of the first power conversion module 120 is connected to another phase of the AC terminal of the second power conversion module 130 so that the first power conversion module 120 and the second power conversion module 130 are connected in series.

[0034] In some embodiments of this utility model, there are at least two first charging and discharging power modules 310, one of which is connected to the DC terminal of the first power conversion module 120, and the other is connected to the DC terminal of the second power conversion module 130.

[0035] In some embodiments of this utility model, the second PCS component 200 may also include at least a first power conversion module 120 and a second power conversion module 130, and there may be at least two second charging and discharging power modules 320. Multiple second charging and discharging power modules 320 are connected to the DC terminal of the first power conversion module 120, the DC terminal of the second power conversion module 130, etc.

[0036] The control module 400 includes a control module, which comprises an MCU or CPU and its auxiliary circuitry. The control module can be connected to the current detection module 340, the first temperature detection module 350, and the second temperature detection module 360, respectively. The control module can also be connected to a display screen, allowing users to view information such as test current, first operating temperature, and second operating temperature. The current detection module 340 may include a sampling resistor and a voltage divider circuit. The sampling resistor can be connected to the first winding 331 or the second winding 332. The voltage divider circuit processes the current signal obtained by the sampling resistor and outputs it to the control module. Both the first temperature detection module 350 and the second temperature detection module 360 ​​may have multiple temperature sensors, thermocouples, etc. Taking the first temperature detection module 350 as an example, the first temperature detection module 350 can detect the temperature information of each switch, capacitor, etc. in the first PCS component 100.

[0037] This utility model relates to a cascaded energy storage PCS charge / discharge parallel testing device. When performance testing of the first PCS component 100 and the second PCS component 200 is required, the first PCS component 100 can be placed at the first testing station, and the second PCS component 200 at the second testing station. The control module 400 controls the operation of the first PCS component 100 and the second PCS component 200. In one testing phase, the first charge / discharge power module 310 can discharge the first PCS component 100, and after transformation by the transformer module 330 and rectification by the second PCS component 200, it charges the second charge / discharge power module 320. In another testing phase... The second charging and discharging power module 320 can also discharge the second PCS component 200. After being transformed by the transformer module 330 and rectified by the first PCS component 100, it charges the first charging and discharging power module 310. Regardless of the test stage, the current detection module 340 can detect the test current. The first temperature detection module 350 detects the first operating temperature of the first PCS component 100, and the second temperature detection module 360 ​​detects the second operating temperature of the second PCS component 200. Users can use this data to analyze whether the PCS component is faulty. This design can quickly and reliably detect the performance of the PCS component and ensure that the PCS component operates stably and reliably.

[0038] In some embodiments of this utility model, the control module 400 includes a synchronous coordination wave transmission module 410, a first main control module 420, and a second main control module 430. The first main control module 420 is used to connect to the controlled end of the first PCS component 100, and the second main control module 430 is used to connect to the controlled end of the second PCS component 200. The synchronous coordination wave transmission module 410 is connected to the first main control module 420 and the second main control module 430 respectively to output a wave transmission control signal.

[0039] The synchronous coordination wave transmission module 410 synchronously sends wave transmission control signals to the first main control module 420 and the second main control module 430. The first main control module 420 is responsible for controlling the operation of the first PCS component 100, and the second main control module 430 is responsible for controlling the operation of the second PCS component 200, thereby reducing the processing load and maintaining the synchronous operation of the first PCS component 100 and the second PCS component 200. Taking the first PCS component 100 as an example, the first main control module 420 is connected to the controlled terminals of each switch in the first power conversion module 120 and the controlled terminals of each switch in the second power conversion module 130.

[0040] The first main control module 420 outputs PWM signals to each switching transistor. When switching transistors Q1 and Q4 are turned on, switching transistors Q2 and Q3 are turned off; when switching transistors Q1 and Q4 are turned off, switching transistors Q2 and Q3 are turned on. Similarly, when switching transistors Q5 and Q8 are turned on, switching transistors Q6 and Q7 are turned off; when switching transistors Q5 and Q8 are turned off, switching transistors Q6 and Q7 are turned on. The first main control module 420 shifts the PWM signals output to switching transistors Q1 and Q4 by 90° to form the PWM signals output to switching transistors Q5 and Q8.

[0041] In some embodiments of this utility model, the synchronous coordination wave transmission module 410 is connected to the first main control module 420 and the second main control module 430 respectively via optical fiber communication cables, thereby ensuring data transmission rate.

[0042] In some embodiments of this utility model, such as Figure 3 As shown, the cascaded energy storage PCS charge-discharge test device also includes a water-cooled module 500, a cold water pipe 510, and a hot water pipe 520. The cold water output terminal of the water-cooled module 500 is connected to the cold water pipe 510, and the hot water input terminal of the water-cooled module 500 is connected to the hot water pipe 520. The cold water pipe 510 is connected to the first cold water input terminal of the first heat exchanger 110 in the first PCS assembly 100 and the second cold water input terminal of the second heat exchanger 210 in the second PCS assembly 200. The hot water pipe 520 is connected to the first hot water output terminal of the first heat exchanger 110 in the first PCS assembly 100 and the second hot water output terminal of the second heat exchanger 210 in the second PCS assembly 200.

[0043] Users can connect the first heat exchanger 110 of the first PCS component 100 to the cold water pipe 510 and the hot water pipe 520. The water-cooling module 500 is equipped with a semiconductor cooling chip or other cooling structure, which can cool the hot water input into the hot water pipe 520 into cold water and output it through the cold water pipe 510. The cold water pipe 510 provides cold water for heat dissipation for the first heat exchanger 110 and the second heat exchanger 210. The hot water after heat exchange between the first heat exchanger 110 and the second heat exchanger 210 is output to the hot water pipe 520. During the test, the water cooling heat dissipation process is simulated, and the operating performance of the first PCS component 100 and the second PCS component 200 is judged by the first operating temperature and the second operating temperature.

[0044] In some embodiments of this utility model, the cascaded energy storage PCS charge-discharge test device further includes a first flow meter 610 and a second flow meter 620. The first flow meter 610 is disposed in the connecting pipe between the cold water pipe 510 and the first cold water input end or in the connecting pipe between the hot water pipe 520 and the first hot water output end. The second flow meter 620 is disposed in the connecting pipe between the cold water pipe 510 and the second cold water input end or in the connecting pipe between the hot water pipe 520 and the second hot water output end. The control module 400 is connected to the first flow meter 610 and the second flow meter 620 respectively.

[0045] The first flow meter 610 and the second flow meter 620 can be conventional devices for detecting liquid flow. By detecting the flow rate entering and exiting the first heat exchanger 110 through the first flow meter 610 and the flow rate entering and exiting the second heat exchanger 210 through the second flow meter 620, it can be determined whether the liquid inside the first heat exchanger 110 and the second heat exchanger 210 is flowing normally, thus ensuring the heat exchange performance of the PCS component.

[0046] In some embodiments of this utility model, the cascaded energy storage PCS charge-discharge test device further includes a first inlet water temperature measuring module 630 and a first outlet water temperature measuring module 640. The first inlet water temperature measuring module 630 is disposed in the connecting pipe between the cold water pipe 510 and the first cold water input terminal to detect the first inlet water temperature. The first outlet water temperature measuring module 640 is disposed in the connecting pipe between the hot water pipe 520 and the first hot water output terminal to detect the first outlet water temperature. The control module 400 is connected to the first inlet water temperature measuring module 630 and the first outlet water temperature measuring module 640 respectively.

[0047] Both the first inlet water temperature measurement module 630 and the first outlet water temperature measurement module 640 can use conventional liquid temperature test probes. During operation, the control module determines whether the first heat exchanger 110 can exchange heat normally with the first PCS component 100 based on the first operating temperature of the component, the first inlet water temperature, and the first outlet water temperature.

[0048] In some embodiments of this utility model, the cascaded energy storage PCS charge-discharge test device further includes a second inlet water temperature measuring module 650 and a second outlet water temperature measuring module 660. The second inlet water temperature measuring module 650 is disposed in the connecting pipe between the cold water pipe 510 and the second cold water input end to detect the second inlet water temperature. The second outlet water temperature measuring module 660 is disposed in the connecting pipe between the hot water pipe 520 and the second hot water output end to detect the second outlet water temperature. The control module 400 is connected to the second inlet water temperature measuring module 650 and the second outlet water temperature measuring module 660 respectively.

[0049] Similarly, the second inlet water temperature measurement module 650 and the second outlet water temperature measurement module 660 can both use conventional liquid temperature test probes. During operation, the control module determines whether the second heat exchanger 210 can exchange heat normally with the second PCS component 200 based on the second operating temperature of the component, the second inlet water temperature, and the second outlet water temperature.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cascaded energy storage PCS charge / discharge test device, characterized in that, include: The testing platform is equipped with a first testing station and a second testing station. The first testing station is used to place the first PCS component, and the second testing station is used to place the second PCS component. The first charging and discharging power supply module and the second charging and discharging power supply module are both disposed on the test platform. The first charging and discharging power supply module is used to connect to the DC terminal of the first PCS component, and the second charging and discharging power supply module is used to connect to the DC terminal of the second PCS component. A transformer module is disposed on the test platform. The transformer module includes a first winding and a second winding coupled to each other. The first winding is used to connect to the AC terminal of a first PCS component, and the second winding is used to connect to the AC terminal of a second PCS component. A current detection module is installed on the test platform, and the current detection module is connected to the first winding or the second winding to detect the test current; A first temperature detection module and a second temperature detection module are provided. The first temperature detection module is set at the first test station to detect the first operating temperature of the first PCS component, and the second temperature detection module is set at the second test station to detect the second operating temperature of the second PCS component. A control module is used to connect to the controlled terminals of the first PCS component and the second PCS component, respectively. The control module is also connected to the current detection module, the first temperature detection module, and the second temperature detection module.

2. The cascaded energy storage PCS charge / discharge test device according to claim 1, characterized in that: The control module includes a synchronous coordinated wave transmission module, a first main control module, and a second main control module. The first main control module is used to connect to the controlled end of the first PCS component, and the second main control module is used to connect to the controlled end of the second PCS component. The synchronous coordinated wave transmission module is connected to the first main control module and the second main control module respectively to output a wave transmission control signal.

3. The cascaded energy storage PCS charge / discharge test device according to claim 2, characterized in that: The synchronous coordination wave transmission module is connected to the first main control module and the second main control module respectively via optical fiber communication cables.

4. The cascaded energy storage PCS charge / discharge test device according to claim 1, characterized in that, It also includes a water-cooling module, cold water pipes, and hot water pipes. The cold water output terminal of the water-cooling module is connected to the cold water pipes, and the hot water input terminal of the water-cooling module is connected to the hot water pipes. The cold water pipes are respectively connected to the first cold water input terminal of the first heat exchanger in the first PCS assembly and to the second cold water input terminal of the second heat exchanger in the second PCS assembly. The hot water pipes are respectively connected to the first hot water output terminal of the first heat exchanger in the first PCS assembly and to the second hot water output terminal of the second heat exchanger in the second PCS assembly.

5. The cascaded energy storage PCS charge / discharge test device according to claim 4, characterized in that, It also includes a first flow meter and a second flow meter. The first flow meter is installed in the connecting pipe between the cold water pipe and the first cold water inlet or in the connecting pipe between the hot water pipe and the first hot water outlet. The second flow meter is installed in the connecting pipe between the cold water pipe and the second cold water inlet or in the connecting pipe between the hot water pipe and the second hot water outlet. The control module is connected to the first flow meter and the second flow meter respectively.

6. The cascaded energy storage PCS charge / discharge test device according to claim 4, characterized in that, It also includes a first inlet water temperature measuring module and a first outlet water temperature measuring module. The first inlet water temperature measuring module is installed in the connecting pipe between the cold water pipe and the first cold water input terminal to detect the first inlet water temperature. The first outlet water temperature measuring module is installed in the connecting pipe between the hot water pipe and the first hot water output terminal to detect the first outlet water temperature. The control module is connected to the first inlet water temperature measuring module and the first outlet water temperature measuring module respectively.

7. The cascaded energy storage PCS charge / discharge test device according to claim 4, characterized in that, It also includes a second inlet water temperature measuring module and a second outlet water temperature measuring module. The second inlet water temperature measuring module is installed in the connecting pipe between the cold water pipe and the second cold water input terminal to detect the second inlet water temperature. The second outlet water temperature measuring module is installed in the connecting pipe between the hot water pipe and the second hot water output terminal to detect the second outlet water temperature. The control module is connected to the second inlet water temperature measuring module and the second outlet water temperature measuring module respectively.

8. The cascaded energy storage PCS charge / discharge test device according to claim 1, characterized in that, The first PCS component includes a first power conversion module and a second power conversion module. The AC terminals of the first power conversion module and the second power conversion module are connected in series to form the AC terminal of the first PCS component. The DC terminal of the first power conversion module forms one of the DC terminals of the first PCS component, and the DC terminal of the second power conversion module forms the other DC terminal of the first PCS component.

9. The cascaded energy storage PCS charge / discharge test device according to claim 8, characterized in that, There are at least two first charging and discharging power supply modules, one of which is connected to the DC terminal of the first power conversion module, and the other is connected to the DC terminal of the second power conversion module.

10. The cascaded energy storage PCS charge / discharge test device according to claim 8, characterized in that, The first power conversion module includes switching transistors Q1, Q2, Q3, and Q4, a bypass switch K1, capacitors C1 and C2, inductors L1 and L2. The input terminal of switching transistor Q1 is connected to the input terminal of switching transistor Q3, the first end of capacitor C1, and the first end of inductor L2, forming one pole of the DC terminal of the first power conversion module. The output terminal of switching transistor Q1 is connected to the input terminal of switching transistor Q2 and the first end of bypass switch K1, forming the first power conversion module. One phase of the AC terminal of the power conversion module, the output terminal of the switch Q2 is connected to the output terminal of the switch Q4, the tail end of the capacitor C1 and the head end of the inductor L1 respectively, the tail end of the inductor L1 is connected to the head end of the capacitor C2 and forms the other pole of the DC terminal of the first power conversion module, the tail end of the inductor L2 is connected to the tail end of the capacitor C2, and the output terminal of the switch Q3 is connected to the input terminal of the switch Q4 and the tail end of the bypass switch K1 respectively and forms the other phase of the AC terminal of the first power conversion module.

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