Testing equipment, device and system for energy storage power device

Abstract

The utility model relates to test equipment, device and system for an energy storage power device. The test equipment comprises a direct current power supply, a to-be-tested power device group and a controller, the to-be-tested power device group comprises a first power device, a second power device and a power inductor, the alternating current side of the first power device is connected with the alternating current side of the second power device through the power inductor, and the direct current side of the first power device and the direct current side of the second power device are electrically connected with the direct current power supply; the controller is in communication connection with the first power device and the second power device; the controller is used for controlling the to-be-tested power device group to carry out active power test and reactive power test. According to the invention, switching between an active power test and a reactive power test can be realized without replacing test equipment, simulation of the to-be-tested power device group in two actual working conditions of active power and reactive power is realized, and then the actual operation life of the to-be-tested power device group is obtained through testing.

Description

Technical Field

[0001] The present application relates to the field of electric energy storage technology, and in particular to a testing device, apparatus and system for energy storage power devices. Background Art

[0002] Energy storage systems are widely used in power systems, rail transit, military industry, petroleum machinery, new energy vehicles, wind power generation, solar photovoltaic and other fields. Energy storage power devices are the basic components of energy storage systems. During long-term use, energy storage power devices may fail due to aging of internal devices. Therefore, it is necessary to verify the service life of energy storage power devices. Therefore, how to accurately obtain the operating life of energy storage power devices is a difficulty that technical personnel in this field urgently need to solve. Utility Model Content

[0003] The present application provides a testing device and system for an energy storage power device, which can simulate the actual working conditions of the energy storage power device and test it to obtain the operating life of the energy storage power device.

[0004] In a first aspect, the present application provides a test device for an energy storage power device, comprising: a DC power supply, a power device group to be tested, and a controller; the power device group to be tested comprises a first power device, a second power device, and a power inductor, one end of the AC side of the first power device is connected to one end of the AC side of the second power device via a power inductor, and one end of the DC side of the first power device is electrically connected to one end of the DC side of the second power device via a DC power supply; the controller is communicatively connected to the first power device and the second power device; the controller is used to adjust the phase difference between the first power device and the second power device, and control the power device group to be tested to perform an active power test; the controller is also used to adjust the modulation ratio of the first power device and the modulation ratio of the second power device, and control the power device group to be tested to perform a reactive power test.

[0005] In the technical solution of the embodiment of the present application, the DC power supply directly draws power from the power grid, and converts the AC power in the power grid into DC power and outputs it to one end of the DC side of the first power device and the second power device, so as to realize the power supply to the power device group to be tested, thereby simulating the working condition that the first power device and the second power device draw power from the battery system on the DC side to work under actual working conditions, and realizes the simulation of the power supply mode of the power device group to be tested during actual operation during the test process, so that the operating life of the power device group to be tested obtained by the test is consistent with the actual operating life. In addition, the present application uses the DC power supply to directly draw power from the power grid to power the test process of the power device group to be tested, so there is no need to set up an additional battery system to power the test process of the power device group to be tested, saving the construction cost of the test equipment.

[0006] The controller can make the first power device and the second power device switch between reactive power test and active power test, and adjust the phase angle difference between the first power device and the second power device through the controller to adjust the active power of the power device group to be tested, so as to perform active power test of the power device group to be tested. The controller adjusts the modulation ratio of the first power device and the modulation ratio of the second power device to adjust the reactive power of the power device group to be tested, so as to perform reactive power test of the power device group to be tested. Therefore, the present application realizes switching between active power test and reactive power test without changing the test equipment, realizes simulation of the actual working conditions of the power device group to be tested in active power and reactive power, and then obtains the actual operating life of the power device group to be tested through testing. Furthermore, by adjusting the positive or negative phase angle difference, the direction of electric energy flow between the first power device and the second power device can be switched, so that the first power device and the second power device can be used as a control device and a test device respectively for a drag test, thereby simulating the operating conditions of the power device group to be tested in the cascade energy storage unit. During the test, the electric energy of the test equipment circulates between the first power device and the second power device, and there is only heat loss in the first power device and the second power device, so the electric energy consumption is small, saving the test cost.

[0007] In some embodiments, the phase angle difference is the phase angle difference between the AC voltage output by the first power device and the AC voltage output by the second power device; the modulation ratio of the first power device is the ratio of the AC side voltage to the DC side voltage of the first power device; the modulation ratio of the second power device is the ratio of the AC side voltage to the DC side voltage of the second power device. The phase angle difference between the AC voltage output by the first power device and the AC voltage output by the second power device is adjusted by the controller to adjust the active power of the power device group to be tested, thereby performing an active power test of the power device group to be tested. The ratio of the AC side voltage to the DC side voltage of the first power device and the ratio of the AC side voltage to the DC side voltage of the second power device are adjusted by the controller to adjust the reactive power of the power device group to be tested, thereby performing a reactive power test of the power device group to be tested. Therefore, the present application realizes switching between active power test and reactive power test without replacing the test equipment, and realizes the simulation of the actual working conditions of the power device group to be tested in active power and reactive power, and then obtains the actual operating life of the power device group to be tested through testing.

[0008] In some embodiments, the first power device includes a first full-bridge circuit, and the second power device includes a second full-bridge circuit; the first end of the first full-bridge circuit and the first end of the second full-bridge circuit are both electrically connected to the first power supply end of the DC power supply, and the second end of the first full-bridge circuit and the second end of the second full-bridge circuit are both electrically connected to the second power supply end of the DC power supply; the third end of the first full-bridge circuit is electrically connected to the fourth end of the second full-bridge circuit through a power inductor, and the fourth end of the first full-bridge circuit is electrically connected to the third end of the second full-bridge circuit; each control end of the first full-bridge circuit and each control end of the second full-bridge circuit are communicatively connected to the controller; wherein the controller is used to control the on and off of the switching devices in the first full-bridge circuit and the second full-bridge circuit, adjust the modulation ratio of the first full-bridge circuit and the modulation ratio of the second full-bridge circuit, and adjust the phase difference between the first full-bridge circuit and the second full-bridge circuit. The present application controls the on-off of the switch devices in the first full-bridge circuit and the second full-bridge circuit through a controller, adjusts the magnitude of the modulation ratio of the first full-bridge circuit and the magnitude of the modulation ratio of the second full-bridge circuit, and adjusts the magnitude of the phase angle difference between the first full-bridge circuit and the second full-bridge circuit, so as to adjust the magnitude of the active power and reactive power of the first full-bridge circuit and the second full-bridge circuit, thereby simulating the first full-bridge circuit and the second full-bridge circuit in two actual working conditions of active power and reactive power, and then obtaining the actual operating life of the power device group to be tested through testing. In addition, the controller also adjusts the positive and negative phase angle difference between the first full-bridge circuit and the second full-bridge circuit to adjust the direction of the flow of electric energy between the first full-bridge circuit and the second full-bridge circuit, thereby realizing the towing test of the first full-bridge circuit and the second full-bridge circuit under reactive power conditions and active power conditions, and then obtaining the actual operating life of the power device group to be tested through testing.

[0009] In some embodiments, the test equipment further includes an operating environment simulation box; the power device group to be tested is arranged in the operating environment simulation box, and the operating environment simulation box is used to simulate the operating environment of the power device group to be tested. The operating environment of the power device group to be tested in the actual working process is simulated by the operating environment simulation box, so that the operating life of the power device group to be tested obtained through the test is the same as the actual operating life. The operating environment simulation box can also accelerate the life decay of the power device group to be tested by adjusting the operating environment of the power device group to be tested, thereby shortening the test time.

[0010] In some embodiments, the operating environment simulation box includes an environmental simulation box; the power device group to be tested is arranged in the environmental simulation box, and the environmental simulation box is used to simulate the environmental conditions of the power device group to be tested under actual working conditions. The environmental simulation box is used to simulate the environmental conditions of the power device group to be tested under actual working conditions, so that the operating life obtained by the test is the same as the actual operating life. The environmental simulation box can also simulate the working conditions of the power device group to be tested under high temperature or high humidity environmental conditions, thereby accelerating the life decay of the power device group to be tested and shortening the test time.

[0011] In some embodiments, the environmental simulation box includes a temperature detection element and a temperature adjustment element; the temperature detection element is used to detect the temperature in the environmental simulation box, and the temperature adjustment element is used to adjust the temperature in the environmental simulation box to a temperature threshold. The temperature conditions of the power device group under actual working conditions are simulated so that the operating life obtained at the test temperature is the same as the life under the temperature environment in which the actual operation is performed. The environmental simulation box can also simulate the working conditions of the power device group under high temperature conditions, thereby accelerating the life decay of the power device group under test and shortening the test time.

[0012] In some embodiments, the environmental simulation box includes a humidity detection element and a humidity adjustment element; the humidity detection element is used to detect the humidity in the environmental simulation box, and the humidity adjustment element is used to adjust the humidity in the environmental simulation box to a humidity threshold. The humidity conditions of the power device group under actual working conditions are simulated so that the operating life obtained under the test humidity is the same as the life under the humidity environment in which the actual operation is located. The environmental simulation box can also simulate the working conditions of the power device group under high humidity conditions, thereby accelerating the life decay of the power device group under test and shortening the test time.

[0013] In some embodiments, the test device further includes a heat sink, wherein the heat sink is used to reduce the temperature of the surface of the power device group to be tested, so that the temperature of the power device group to be tested will not exceed the temperature threshold during the test process, thereby reducing the risk of fire caused by excessive temperature of the power device group to be tested, and at the same time, the operating life of the power device group to be tested can be extended.

[0014] In some embodiments, the heat sink is an air-cooled heat sink; the air outlet of the air-cooled heat sink is arranged on the surface of one side of the power device group to be tested, and the air-cooled heat sink is communicatively connected with the controller. The air-cooled heat sink adopts a method of blowing air on the surface of the power device group to be tested, so that the temperature of the power device group to be tested will not exceed the temperature threshold during the test process, thereby reducing the risk of fire caused by excessive temperature of the power device group to be tested, and at the same time, it can also extend the operating life of the power device group to be tested.

[0015] In some embodiments, the radiator is a water-cooled radiator; the transmission pipeline of the water-cooled radiator is arranged on the surface of one side of the power device group to be tested, and the water-cooled radiator is communicatively connected with the controller. The water-cooled radiator reduces the surface temperature of the power device group to be tested by using cold water flowing in the transmission pipeline, so that the temperature of the power device group to be tested during the test will not exceed the temperature threshold, thereby reducing the risk of fire caused by excessive temperature of the power device group to be tested, and at the same time, can extend the operating life of the power device group to be tested.

[0016] In some embodiments, the DC power supply includes a converter; the input end of the converter is electrically connected to the power grid, and the DC side of the first power device and the DC side of the second power device are electrically connected to the output end of the converter. The power device group to be tested is powered by power directly from the power grid through the converter, which can not only ensure that the power device group to be tested will not be powered off during the test, but also simulate the working condition of the power device group to be tested taking power from the battery system on the DC side to work in the actual working state.

[0017] In some embodiments, the test device further includes a soft starter; the DC side of the first power device and the DC side of the second power device are electrically connected to the DC power supply through the soft starter. When the DC power supply starts to supply power, the voltage of the soft starter will gradually increase, thereby pre-charging the capacitor in the first power device and the capacitor in the second power device, avoiding the generation of a large voltage when the DC power supply starts to supply power, which may damage the capacitor in the first power device and the capacitor in the second power device, thereby ensuring the test safety of the power device group to be tested.

[0018] In some embodiments, the test device further comprises a switch element; the DC side of the first power device and the DC side of the second power device are electrically connected to the DC power supply through the switch element. After the switch element is turned on, the DC power supply starts to supply power to the first power device and the second power device.

[0019] In a second aspect, the present application provides a testing device for an energy storage power device, which includes the testing equipment for the energy storage power device as in the above-mentioned embodiment.

[0020] In a third aspect, the present application provides a testing system for an energy storage power device, which includes a testing device for an energy storage power device as in the above-mentioned embodiment.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of the structure of a testing device for an energy storage power device according to an embodiment of the present application.

[0024] Figure 2 This is an operating status diagram of a testing device for an energy storage power device according to an embodiment of the present application.

[0025] Figure 3 This is an operating status diagram of another energy storage power device testing equipment according to an embodiment of the present application.

[0026] Figure 4 A schematic structural diagram of a preferred energy storage power device testing device according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0029] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] At present, energy storage systems are widely used in power systems, rail transit, military industry, petroleum machinery and other fields. Energy storage power devices are the basic components of energy storage systems. During long-term use, energy storage power devices may fail due to the aging of internal devices. Therefore, it is extremely important to test the service life of energy storage power devices. In order to test energy storage power devices, the method of drag test is usually adopted. By testing the active power condition and reactive power condition of energy storage power devices, the operating life test of energy storage power devices can be realized.

[0036] The inventor has noticed that the testing equipment currently in use for energy storage power devices can only realize life testing of the active power condition or reactive power condition of the energy storage power devices separately, while in the actual operation process of the energy storage power devices, the active power condition or the reactive power condition operates in parallel. Therefore, the existing equipment for testing the operating life of the energy storage power devices cannot simulate both the active power condition and the reactive power condition of the energy storage power devices through the same equipment, and therefore cannot simulate the actual operating conditions of the energy storage power devices, resulting in an error between the tested operating life of the energy storage power devices and the actual operating life.

[0037] Therefore, in order to solve the problem of errors in the life test of energy storage power devices, the inventors have designed a test device for energy storage power devices after in-depth research. The same test device can be used to switch between active power testing and reactive power testing during the test of the power device group to be tested, thereby simulating the actual working conditions of the power device group to be tested under both active power and reactive power conditions, and then obtaining the actual operating life of the power device group to be tested through testing.

[0038] The energy storage power device test equipment disclosed in the embodiment of the present application can be, but is not limited to, a test system for energy storage power devices for wind power generation, a test system for energy storage power devices for solar photovoltaic, etc. A test system composed of the energy storage power device test equipment and devices disclosed in the present application can be used, so that the working conditions of the power device group to be tested during the test process can be ensured to be consistent with the actual working conditions of the power device group to be tested, so that the operating life of the power device group to be tested obtained by the test is consistent with the actual operating life.

[0039] An embodiment of the present application provides a test system for an energy storage power device. The test system may be, but is not limited to, a tow test platform or the like.

[0040] According to some embodiments of the present application, Figure 1 This is a structural schematic diagram of a test device for an energy storage power device according to an embodiment of the present application. Figure 1As shown, the test equipment includes: a DC power supply 210, a power device group to be tested, and a controller 220. The power device group to be tested includes a first power device 110, a second power device 120, and a power inductor L. The AC side of the first power device 110 and the AC side of the second power device 120 are connected through the power inductor L, and the DC side of the first power device 110 and the DC side of the second power device 120 are electrically connected to the DC power supply 210. The controller 220 is connected to the first power device 110 and the second power device 120 in communication; the controller 220 is used to adjust the phase angle difference between the first power device 110 and the second power device 120, and control the power device group to be tested to perform active power testing; the controller 220 is also used to adjust the modulation ratio of the first power device 110 and the modulation ratio of the second power device 120, and control the power device group to be tested to perform reactive power testing.

[0041] Specifically, the first end 111 of the first power device 110 and the first end 121 of the second power device 120 are both electrically connected to the positive terminal 211 of the DC power supply 210, and the second end 112 of the first power device 110 and the second end 122 of the second power device 120 are both electrically connected to the negative terminal 212 of the DC power supply 210, that is, the DC side of the first power device 110 and the DC side of the second power device 120 are electrically connected to the DC power supply 210, and the third end 113 of the first power device 110 is electrically connected to the fourth end 124 of the second power device 120 through the power inductor L, and the fourth end 114 of the first power device 110 is electrically connected to the third end 123 of the second power device 120, that is, the AC side of the first power device 110 is electrically connected to the AC side of the second power device 120. The two sides are connected through a power inductor L, and the power inductor L is used for power exchange between the first power device 110 and the second power device 120. The controller 220 is communicated with the first power device 110 and the second power device 120. The controller 220 adjusts the reactive power of the first power device 110 and the second power device 120 by adjusting the modulation ratio of the first power device 110 and the modulation ratio of the second power device 120, so as to realize the first power device 110 and the second power device 120 entering the reactive power working state, wherein the modulation ratio of the first power device 110 is the ratio of the AC side voltage to the DC side voltage of the first power device 110, and the modulation ratio of the second power device 120 is the ratio of the AC side voltage to the DC side voltage of the second power device 120. The controller 220 also adjusts the active power of the first power device 110 and the second power device 120 by adjusting the phase difference between the AC voltage output by the first power device 110 and the AC voltage output by the second power device 120, thereby enabling the first power device 110 and the second power device 120 to enter the active power operating state.

[0042] The present application adjusts the phase angle difference between the AC voltage output by the first power device 110 and the AC voltage output by the second power device 120 through the controller 220, so as to adjust the active power of the power device group to be tested, thereby performing an active power test on the power device group to be tested. The controller 220 adjusts the ratio of the AC side voltage to the DC side voltage of the first power device 110, and adjusts the ratio of the AC side voltage to the DC side voltage of the second power device 120, so as to adjust the reactive power of the power device group to be tested, thereby performing a reactive power test on the power device group to be tested. As a result, the present application realizes switching between active power testing and reactive power testing without replacing the test equipment, realizes the simulation of the two actual working conditions of the power device group to be tested in active power and reactive power, and then obtains the actual operating life of the power device group to be tested through testing.

[0043] The controller 220 also adjusts the positive or negative phase difference between the AC voltage output by the first power device 110 and the AC voltage output by the second power device 120 to adjust the direction of the flow of electric energy between the first power device 110 and the second power device 120. When the phase difference between the first power device 110 and the second power device 120 is set to a positive phase difference, the direction of the flow of electric energy is from the first power device 110 to the second power device 120. At this time, the first power device 110 is in the inverter working mode, and the second power device 120 is in the rectification working mode. The first power device 110 converts the DC power provided by the DC power supply 210 into AC power, and the second power device 120 rectifies the AC power received from the first power device 110 into DC power. When the phase difference between the first power device 110 and the second power device 120 is set to a negative phase difference, the direction of flow of electric energy is from the second power device 120 to the first power device 110. At this time, the first power device 110 is in a rectifier working mode, and the second power device 120 is in an inverter working mode. The second power device 120 converts the DC power provided by the DC power supply 210 into AC power, and the first power device 110 rectifies the AC power received from the second power device 120 into DC power. In this way, the electric energy provided by the DC power supply 210 can be circulated between the first power device 110 and the second power device 120, so that only the first power device 110 and the second power device 120 have heat loss, thereby reducing the consumption of electric energy. The controller 220 also detects the parameters of the entire test device during the test of the first power device 110 and the second power device 120. When a parameter abnormality is detected, the controller 220 sends a fault protection command to each period in the test device to provide a fault protection function for the test device.

[0044] The DC power supply 210 and the controller 220 cooperate with each other to simulate the actual operating environment of the power device group to be tested. The power grid 300 is electrically connected to the first power device 110 and the second power device 120 through the DC power supply 210. The DC power supply 210 directly draws power from the power grid 300, and converts the AC power in the power grid 300 into DC power and outputs it to the first power device 110 and the second power device 120 to realize the power supply to the power device group to be tested, thereby simulating the working conditions under which the first power device 110 and the second power device 120 draw power from the battery system on the DC side to work, and realizes the simulation of the power supply mode when the power device group to be tested is actually working during the test process. In addition, the present application uses the DC power supply 210 to directly draw power from the power grid to power the test process of the power device group to be tested, so there is no need to set up an additional battery system to power the test process of the power device group to be tested, saving the cost of setting up the test equipment. The controller 220 can also switch the direction of electric energy flow between the first power device 110 and the second power device 120, so that the first power device 110 and the second power device 120 are used as a control device and a test device respectively, thereby performing a pair-drag test on the first power device 110 and the second power device 120 to simulate the operating condition of the power device group to be tested in the cascade energy storage unit.

[0045] In some embodiments, the first power device includes a first full-bridge circuit, and the second power device includes a second full-bridge circuit; the first end of the first full-bridge circuit and the first end of the second full-bridge circuit are both electrically connected to the first power supply end of the DC power supply, and the second end of the first full-bridge circuit and the second end of the second full-bridge circuit are both electrically connected to the second power supply end of the DC power supply; the third end of the first full-bridge circuit is electrically connected to the third end of the second full-bridge circuit through a power inductor, and the fourth end of the first full-bridge circuit is electrically connected to the fourth end of the second full-bridge circuit; each control end of the first full-bridge circuit and each control end of the second full-bridge circuit are communicatively connected to the controller. The controller is used to control the on and off of the switch devices in the first full-bridge circuit and the second full-bridge circuit, adjust the modulation ratio of the first full-bridge circuit and the modulation ratio of the second full-bridge circuit, and adjust the phase difference between the first full-bridge circuit and the second full-bridge circuit.

[0046] Specifically, the first end of the first full-bridge circuit and the first end of the second full-bridge circuit are both electrically connected to the first power supply end of the DC power supply, and the second end of the first full-bridge circuit and the second end of the second full-bridge circuit are both electrically connected to the second power supply end of the DC power supply, that is, the DC side of the first full-bridge circuit is connected in parallel with the DC side of the second full-bridge circuit. The third end of the first full-bridge circuit is electrically connected to the third end of the second full-bridge circuit through a power inductor, and the fourth end of the first full-bridge circuit is electrically connected to the fourth end of the second full-bridge circuit, that is, the AC side of the first full-bridge circuit is connected in parallel with the AC side of the second full-bridge circuit through a power inductor, and the power inductor is used for power exchange between the first full-bridge circuit and the second full-bridge circuit.

[0047] The test equipment also includes a driver, and the controller is connected to each control end of the first full-bridge circuit and each control end of the second full-bridge circuit through the driver. Each control end of the first full-bridge circuit is a control end of each switch device in the first full-bridge circuit, and each control end of the second full-bridge circuit is a control end of each switch device in the second full-bridge circuit. The controller sends a switch signal to the driver, and the driver sends a level signal to each control end of the first full-bridge circuit and each control end of the second full-bridge circuit according to the acquired switch signal to control the on-off of each switch device in the first full-bridge circuit and the on-off of each switch device in the second full-bridge circuit, thereby adjusting the modulation ratio of the first full-bridge circuit and the modulation ratio of the second full-bridge circuit, thereby adjusting the reactive power of the first full-bridge circuit and the second full-bridge circuit, and then making the first full-bridge circuit and the second full-bridge circuit enter the reactive power working state, wherein the modulation ratio of the first full-bridge circuit is the ratio of the AC side voltage to the DC side voltage of the first full-bridge circuit, and the modulation ratio of the second full-bridge circuit is the ratio of the AC side voltage to the DC side voltage of the second full-bridge circuit. The controller also controls the on and off of each switch device in the first full-bridge circuit and the on and off of each switch device in the second full-bridge circuit through the driver, so as to adjust the phase difference between the AC voltage output by the first full-bridge circuit and the AC voltage output by the second full-bridge circuit, thereby adjusting the active power of the first full-bridge circuit and the second full-bridge circuit, and then making the first full-bridge circuit and the second full-bridge circuit enter the active power working condition. Therefore, the present application realizes the switching between active power test and reactive power test without changing the test equipment, realizes the simulation of the first full-bridge circuit and the second full-bridge circuit in the two actual working conditions of active power and reactive power, and then obtains the actual operating life of the power device group to be tested through testing.

[0048] The controller also adjusts the direction of electric energy flow between the first full-bridge circuit and the second full-bridge circuit by controlling the positive or negative phase difference between the AC voltage output by the first full-bridge circuit and the AC voltage output by the second full-bridge circuit.

[0049] Figure 2 This is an operating state diagram of a test device for an energy storage power device according to an embodiment of the present application, such as Figure 2 As shown, when the phase difference between the first full-bridge circuit 130 and the second full-bridge circuit 140 is set to a positive phase difference, the direction of flow of electric energy is from the first full-bridge circuit 130 to the second full-bridge circuit 140. At this time, the first full-bridge circuit 130 is in the inverter working mode, and the second full-bridge circuit 140 is in the rectification working mode. The first full-bridge circuit 130 converts the DC power provided by the DC power supply 210 into AC power, and the second full-bridge circuit 140 rectifies the AC power received from the first full-bridge circuit 130 into DC power.

[0050] Figure 3 This is an operating state diagram of another energy storage power device testing device according to an embodiment of the present application, such as Figure 3 As shown, when the phase difference between the first full-bridge circuit 130 and the second full-bridge circuit 140 is set to a negative phase difference, the direction of flow of electric energy is from the second full-bridge circuit 140 to the first full-bridge circuit 130. At this time, the first full-bridge circuit 130 is in a rectifier working mode, and the second full-bridge circuit 140 is in an inverter working mode. The second full-bridge circuit 140 converts the DC power provided by the DC power supply 210 into AC power, and the first full-bridge circuit 130 rectifies the AC power received from the second full-bridge circuit 140 into DC power. In this way, the electric energy provided by the DC power supply 210 can be circulated between the first full-bridge circuit 130 and the second full-bridge circuit 140, so that only the first full-bridge circuit 130 and the second full-bridge circuit 140 have heat loss, thereby reducing the consumption of electric energy.

[0051] In some embodiments, the first full-bridge circuit and the second full-bridge circuit both include a first power switch, a second power switch, a third power switch, a fourth power switch and a voltage-stabilizing capacitor; the first power switch and the second power switch are connected in series to the first branch, the third power switch and the fourth power switch are connected in series to the second branch, the first branch is connected in parallel to the second branch and the voltage-stabilizing capacitor, the control end of the first power switch, the control end of the second power switch, the control end of the third power switch and the control end of the fourth power switch are all communicatively connected to the controller, the first end of the first branch and the first end of the second branch are both electrically connected to the first end of the full-bridge circuit, the second end of the first branch and the second end of the second branch are both electrically connected to the second end of the full-bridge circuit, the third end of the first branch is electrically connected to the third end of the full-bridge circuit, and the third end of the second branch is electrically connected to the fourth end of the full-bridge circuit.

[0052] Specifically, the first end of the first power switch is the first end of the first branch, the second end of the first power switch and the first end of the second power switch are electrically connected to the third end of the first branch, and the second end of the second power switch is the second end of the first branch. The first end of the third power switch is the first end of the second branch, the second end of the third power switch and the first end of the fourth power switch are electrically connected to the third end of the second branch, and the second end of the fourth power switch is the second end of the first branch. The controller is communicatively connected to the control end of the first power switch, the control end of the second power switch, the control end of the third power switch and the control end of the fourth power switch. The controller adjusts the duty cycle of the output waveform by controlling the conduction and shutdown of the first power switch, the second power switch, the third power switch and the fourth power switch, thereby adjusting the modulation ratio and phase difference of the first full-bridge circuit and the second full-bridge circuit, and further switching the first full-bridge circuit and the second full-bridge circuit between reactive power conditions and active power conditions, and adjusting the direction of electric energy flow between the first full-bridge circuit and the second full-bridge circuit. The voltage-stabilizing capacitor can be used to store and release voltage to ensure the stability of the circuit when the full-bridge circuit starts to power on and off.

[0053] In some embodiments, the testing equipment further includes an operating environment simulation box; the power device group to be tested is disposed in the operating environment simulation box, and the operating environment simulation box is used to simulate the operating environment of the power device group to be tested.

[0054] Exemplarily, the operating environment of the power device group to be tested may be the natural environmental conditions of the power device group to be tested during actual operation, the external circuit environment of the power device group to be tested, etc. Since the power device group to be tested will be affected by natural environmental conditions such as temperature and humidity during actual operation, thereby affecting the operating life, it is necessary to simulate the natural environmental conditions of the actual working process of the power device group to be tested during the test process, so that the working life obtained by the test is closer to the actual working life. The operating environment simulation box can also accelerate the life decay of the power device group to be tested by adjusting the operating environment of the power device group to be tested, thereby shortening the test time.

[0055] It should be noted that the operating environment of the power device group under test may also be the natural environmental conditions of the power device group under test during actual operation. Other operating environments other than the external circuit environment of the power device group under test that affect the operating life of the power device group under test are not specifically limited here.

[0056] In some embodiments, the operating environment simulation box also includes an environmental simulation box; the power device group to be tested is arranged in the environmental simulation box, and the environmental simulation box is used to simulate the environmental conditions of the power device group to be tested in actual working conditions.

[0057] Exemplarily, the environmental conditions may be, for example, the humidity and temperature of the power device group to be tested in the actual working environment. The environmental simulation box adjusts the humidity inside the environmental simulation box so that during the test of the power device group to be tested, the environmental humidity of the power device group to be tested can reach the humidity of the power device group to be tested in the actual working environment, thereby ensuring that the environmental humidity of the power device group to be tested during the test is consistent with the humidity of the power device group to be tested in the actual working environment. The environmental simulation box also adjusts the temperature inside the environmental simulation box so that during the test of the power device group to be tested, the environmental temperature of the power device group to be tested can reach the temperature of the power device group to be tested in the actual working environment, thereby ensuring that the environmental temperature of the power device group to be tested during the test is consistent with the temperature of the power device group to be tested in the actual working environment, so that the operating life of the power device group to be tested obtained by the test is consistent with the actual operating life. In addition, the environmental simulation box can also be used to increase the environmental humidity and temperature of the power device group to be tested during the test, so that the operating life decay rate of the power device group to be tested during the test is accelerated, so as to shorten the test time, thereby improving the test efficiency and reducing the test cost.

[0058] It should be noted that the environmental conditions of humidity and temperature are only examples, and the environmental conditions may also be other environmental conditions that may affect the operating life of the power device group to be tested during actual operation, which are not specifically limited here.

[0059] Preferably, in some embodiments, the environmental simulation box includes a temperature detection element and a temperature adjustment element; the temperature detection element is used to detect the temperature in the environmental simulation box, and the temperature adjustment element is used to adjust the temperature in the environmental simulation box to a temperature threshold.

[0060] Specifically, the temperature detection element detects the temperature in the environmental simulation box. When the temperature is detected to be lower than the temperature threshold, the controller controls the temperature adjustment element to adjust the temperature in the environmental simulation box to the temperature threshold, thereby ensuring that the operating environment of the power device group to be tested during the test is consistent with the actual operating environment of the power device group to be tested, so that the operating life of the power device group to be tested obtained by the test is consistent with the actual operating life. In addition, the environmental simulation box can also be used to increase the ambient temperature of the power device group to be tested during the test, so that the operating life of the power device group to be tested during the test is accelerated to reduce the test time, thereby improving the test efficiency and reducing the test cost.

[0061] Preferably, in some embodiments, the environmental simulation box includes a humidity detection element and a humidity adjustment element, the humidity detection element is used to detect the humidity in the environmental simulation box, and the humidity adjustment element is used to adjust the humidity in the environmental simulation box to a humidity threshold.

[0062] Specifically, the humidity detection element detects the humidity in the environmental simulation box. When the humidity is detected to be lower than or higher than the humidity threshold, the controller controls the humidity adjustment element to adjust the humidity in the environmental simulation box to the humidity threshold, thereby ensuring that the operating environment of the power device group to be tested during the test is consistent with the actual operating environment of the power device group to be tested, so that the operating life of the power device group to be tested obtained by the test is consistent with the actual operating life. In addition, the environmental simulation box can also be used to increase the environmental humidity of the power device group to be tested during the test, so that the operating life of the power device group to be tested during the test is accelerated to reduce the test time, thereby improving the test efficiency and reducing the test cost.

[0063] In some embodiments, the testing device further comprises a heat sink; wherein the heat sink is used to reduce the temperature of the surface of the power device group to be tested.

[0064] Exemplarily, the heat sink is used to lower the surface temperature of the power device group under test, thereby reducing the risk of fire caused by excessive temperature of the power device group under test. At the same time, it can also avoid abnormal working state of the power device group under test due to excessive temperature, thereby affecting the operating life of the power device group under test.

[0065] In some embodiments, the heat sink is an air-cooled heat sink; the air outlet of the air-cooled heat sink is arranged on the surface of one side of the power device group to be tested, and the air-cooled heat sink is communicatively connected with the controller.

[0066] Exemplarily, an air outlet of the air-cooled heat sink is arranged on a surface on one side of the power device group to be tested, and the air-cooled heat sink is communicatively connected to a controller. The controller detects status information of the power device group to be tested, such as the temperature of the surface of the power device group to be tested. When the temperature of the surface of the power device group to be tested is higher than a temperature threshold, it is determined that the heat generated by the power device group to be tested is too high. The air-cooled heat sink increases the air volume at the air outlet so that the heat generated by the power device group to be tested is reduced by the wind blown out by the air-cooled heat sink, thereby preventing the temperature of the power device group to be tested from being too high, reducing the risk of fire caused by excessively high temperature in the power device group to be tested, and at the same time extending the operating life of the power device group to be tested.

[0067] It should be noted that the status information of the power device group to be tested may also be other information other than temperature that can reflect the thermal condition of the power device group to be tested, which is not specifically limited here.

[0068] In some embodiments, the radiator is a water-cooled radiator; a heat dissipation pipe of the water-cooled radiator is arranged on a surface of one side of the power device group to be tested, and the water-cooled radiator is communicatively connected with the controller.

[0069] Exemplarily, the radiator can be, for example, a water-cooled radiator, a transmission pipeline of the water-cooled radiator being arranged on the surface of one side of the power device group to be tested, the water-cooled radiator being communicatively connected to a controller, the controller detecting status information of the power device group to be tested, such as the temperature of the surface of the power device group to be tested, and when the temperature of the surface of the power device group to be tested is higher than a temperature threshold, determining that the heat generated by the power device group to be tested is too high, the cooling liquid in the water-cooled radiator absorbs the heat dissipated from the surface of the power device group to be tested along the transmission pipeline and carries it away from the power device group to be tested, thereby ensuring that the temperature of the power device group to be tested does not exceed the temperature threshold, thereby reducing the risk of fire caused by excessively high temperature in the power device group to be tested, and at the same time extending the operating life of the power device group to be tested.

[0070] It should be noted that the status information of the power device group to be tested may also be other information other than temperature that can reflect the thermal condition of the power device group to be tested, which is not specifically limited here.

[0071] In some embodiments, the heat sink is a direct-cooling heat sink; the direct-cooling heat sink includes a heat-conducting structure, and the heat-conducting structure is arranged on a surface of one side of the power device group to be tested.

[0072] Exemplarily, the heat sink can be a direct-cooling heat sink, which includes a heat-conducting structure. The heat-conducting structure can be, for example, a heat sink. The heat sink can accelerate the exchange of heat generated by the power device group to be tested with the air, thereby achieving rapid conduction of the heat generated by the power device group to be tested to the air, thereby reducing the temperature of the power device group to be tested, reducing the risk of fire caused by excessive temperature in the power device group to be tested, and at the same time avoiding abnormal working state of the power device group to be tested due to excessive temperature, thereby affecting the operating life of the power device group to be tested.

[0073] It should be noted that the heat-conducting structure may also be other structures that can achieve heat conduction except the heat sink, and no specific limitation is made here.

[0074] In some embodiments, the DC power supply includes a converter; the input end of the converter is electrically connected to the power grid, and the DC side of the first power device and the DC side of the second power device are electrically connected to the output end of the converter.

[0075] Specifically, the power grid outputs the AC voltage to the converter through the input end of the converter, and the converter converts the three-phase AC power provided by the power grid into DC power, and outputs the converted DC power to the first power device and the second power device through the output end of the converter, thereby realizing the power supply to the first power device and the second power device. During the test process of the power device group to be tested, since the first power device and the second power device are always in a working state, the converter continues to work in a rectifier state, and outputs the electric energy provided by the power grid to the first power device and the second power device, so that the first power device and the second power device can be tested for a long time. Compared with the method of using a battery system to power the test process of the power device group to be tested, the present application uses the converter to directly take power from the power grid to power the first power device and the second power device, which can not only ensure that the first power device and the second power device will not be powered off during the test process, but also simulate the working condition of the first power device and the second power device taking power from the battery system on the DC side to work in the actual working state. In addition, the present application uses the inverter to directly draw power from the power grid as the power supply method for the first power device and the second power device during the test process, so there is no need to set up an additional battery system to power the test process of the first power device and the second power device, thereby reducing the construction cost of the test equipment.

[0076] In some embodiments, the DC power supply includes a battery simulator; the DC side of the first power device and the DC side of the second power device are electrically connected to an output end of the battery simulator.

[0077] Specifically, the battery simulator can simulate the charging and discharging process of the battery system. Therefore, the battery simulator can simulate the actual working conditions of using the battery system for power supply. The battery simulator is used to power the DC side of the first power module and the second power module. Compared with using the battery system to power the test process of the power device group to be tested, there is no need to set up an additional battery system, thereby reducing the cost of setting up the test equipment.

[0078] In some embodiments, the testing device further includes a soft starter; the DC side of the first power device and the DC side of the second power device are electrically connected to a DC power supply through the soft starter.

[0079] Specifically, when the power device group to be tested starts testing, the DC power supply directly draws power from the power grid and supplies power to the DC side of the first power device and the DC side of the second power device. Since the first power device and the second power device both include capacitors, when the DC power supply starts supplying power, if a larger voltage is used to charge the capacitor, the voltage will exceed the rated voltage of the capacitor, thereby causing damage to the capacitor, and further damaging the first power device and the second power device. The present application provides a soft starter between the DC power supply and the power device group to be tested. When the DC power supply starts supplying power, the voltage in the soft starter will gradually increase from 0, so that the voltage across the capacitor in the power device group to be tested gradually increases, thereby completing the pre-charging of the capacitor, thereby avoiding the generation of a larger voltage when the DC power supply starts supplying power, which damages the capacitors in the first power device and the second power device, and ensuring the safety of the test of the energy storage power element.

[0080] In some embodiments, the testing device further includes a switching element; one end of the DC side of the first power device and the second power device is electrically connected to a DC power supply through the switching element.

[0081] Specifically, when the switch element is closed, the controller detects the power device group to be tested, and when it is detected that the first power device and the second power device are not faulty, the DC power supply starts to supply power to the power device group to be tested.

[0082] Preferably, Figure 4 This is a schematic diagram of a preferred energy storage power device testing device according to an embodiment of the present application. Figure 4 As shown, the test equipment includes: a first full-bridge circuit 130 , a second full-bridge circuit 140 , a controller 220 , a converter 230 , a soft starter 240 , a switch element 250 , a power inductor L, an air-cooled heat sink 260 and an environmental simulation box 270 .

[0083] The first end 131 of the first full-bridge circuit 130 is electrically connected to the first output end 231 of the converter 230 through the switch element 250 and the soft starter 240, the first end 141 of the second full-bridge circuit 140 is electrically connected to the first output end 231 of the converter 230 through the switch element 250 and the soft starter 240, the second end 132 of the first full-bridge circuit 130 is electrically connected to the second output end 232 of the converter 230 through the switch element 250 and the soft starter 240, the second end 142 of the second full-bridge circuit 140 is electrically connected to the second output end 232 of the converter 230 through the switch element 250 and the soft starter 240, and the converter 230 is electrically connected to the power grid 300. The third end 133 of the first full-bridge circuit 130 is electrically connected to the fourth end 144 of the second full-bridge circuit 140 through the power inductor L, the fourth end 134 of the first full-bridge circuit 130 is electrically connected to the third end 143 of the second full-bridge circuit 140, and each control end of the first full-bridge circuit 130 and each control end of the second full-bridge circuit 140 are both communicatively connected to the controller 220. The first full-bridge circuit 130 and the second full-bridge circuit 140 are both disposed in the environmental simulation box 270, the air-cooled radiator 260 is communicatively connected to the controller 220, and the air outlet of the air-cooled radiator 260 is disposed on the surface of the same side of the first full-bridge circuit 130 and the second full-bridge circuit 140.

[0084] Specifically, each control end of the first full-bridge circuit 130 is a control end of each switch device in the first full-bridge circuit 130, and each control end of the second full-bridge circuit 140 is a control end of each switch device in the second full-bridge circuit 140. The controller 220 adjusts the modulation ratio of the first full-bridge circuit 130 and the modulation ratio of the second full-bridge circuit 140 by controlling the on-off of each switch device in the first full-bridge circuit 130 and the on-off of each switch device in the second full-bridge circuit 140, thereby adjusting the reactive power of the first full-bridge circuit 130 and the second full-bridge circuit 140, thereby making the first full-bridge circuit 130 and the second full-bridge circuit 140 enter the reactive power working state, wherein the modulation ratio of the first full-bridge circuit 130 is the ratio of the AC side voltage to the DC side voltage of the first full-bridge circuit 130, and the modulation ratio of the second full-bridge circuit 140 is the ratio of the AC side voltage to the DC side voltage of the second full-bridge circuit 140. The controller 220 also adjusts the phase difference between the AC voltage output by the first full-bridge circuit 130 and the AC voltage output by the second full-bridge circuit 140 by controlling the on and off of each switch device in the first full-bridge circuit 130 and the on and off of each switch device in the second full-bridge circuit 140, thereby adjusting the active power of the first full-bridge circuit 130 and the second full-bridge circuit 140, and then making the first full-bridge circuit 130 and the second full-bridge circuit 140 enter the active power working condition. Therefore, the present application realizes switching between active power testing and reactive power testing without replacing the test equipment, and realizes simulation of the first full-bridge circuit 130 and the second full-bridge circuit 140 in two actual working conditions of active power and reactive power, and then obtains the actual operating life of the power device group to be tested through testing.

[0085] The controller 220 also controls the positive or negative phase difference between the AC voltage output by the first full-bridge circuit 130 and the AC voltage output by the second full-bridge circuit 140. When the phase difference between the first full-bridge circuit 130 and the second full-bridge circuit 140 is set to a positive phase difference, the direction of flow of electric energy is from the first full-bridge circuit 130 to the second full-bridge circuit 140. At this time, the first full-bridge circuit 130 is in the inverter working mode, and the second full-bridge circuit 140 is in the rectification working mode. The first full-bridge circuit 130 converts the DC power provided by the converter 230 into AC power, and the second full-bridge circuit 140 rectifies the AC power received from the first full-bridge circuit 130 into DC power. When the phase difference between the first full-bridge circuit 130 and the second full-bridge circuit 140 is set to a negative phase difference, the direction of flow of electric energy is from the second full-bridge circuit 140 to the first full-bridge circuit 130. At this time, the first full-bridge circuit 130 is in a rectifier working mode, and the second full-bridge circuit 140 is in an inverter working mode. The second full-bridge circuit 140 converts the direct current provided by the converter 230 into alternating current, and the first full-bridge circuit 130 rectifies the alternating current received from the second full-bridge circuit 140 into direct current. In this way, the electric energy provided by the converter 230 can be circulated between the first full-bridge circuit 130 and the second full-bridge circuit 140, so that only the first full-bridge circuit 130 and the second full-bridge circuit 140 have heat loss, thereby reducing the consumption of electric energy.

[0086] The air outlet of the air-cooled heat sink 260 is arranged on the surface on the same side of the first full-bridge circuit 130 and the second full-bridge circuit 140. The air-cooled heat sink 260 is communicatively connected with the controller 220. The controller 220 detects the status information of the first full-bridge circuit 130 and the second full-bridge circuit 140, such as the surface temperature of the first full-bridge circuit 130 and the second full-bridge circuit 140. When the surface temperature of the first full-bridge circuit 130 and the second full-bridge circuit 140 is higher than the temperature threshold, it is determined that the heat generated by the first full-bridge circuit 130 and the second full-bridge circuit 140 is too high. The air-cooled heat sink 260 increases the air volume at the air outlet so that the heat generated by the first full-bridge circuit 130 and the second full-bridge circuit 140 is reduced by the wind blown out by the air-cooled heat sink 260, so that the temperature of the first full-bridge circuit 130 and the second full-bridge circuit 140 will not be too high, thereby reducing the risk of fire caused by excessive temperature of the first full-bridge circuit 130 and the second full-bridge circuit 140, and at the same time, the operating life of the first full-bridge circuit 130 and the second full-bridge circuit 140 can be extended.

[0087] The environmental conditions may be, for example, the temperature and humidity of the first full-bridge circuit 130 and the second full-bridge circuit 140 in an actual working environment. The environmental simulation box 270 adjusts the internal temperature and humidity of the environmental simulation box 270 so that during the testing of the first full-bridge circuit 130 and the second full-bridge circuit 140, the ambient temperature and humidity of the first full-bridge circuit 130 and the second full-bridge circuit 140 can reach the values ​​of the temperature and humidity of the first full-bridge circuit 130 and the second full-bridge circuit 140 in an actual working environment, thereby ensuring that the operating environment of the first full-bridge circuit 130 and the second full-bridge circuit 140 during the testing process is consistent with the actual operating environment of the first full-bridge circuit 130 and the second full-bridge circuit 140, so that the operating life of the first full-bridge circuit 130 and the second full-bridge circuit 140 obtained by test is consistent with the actual operating life.

[0088] When the first full-bridge circuit 130 and the second full-bridge circuit 140 start testing, the converter 230 directly draws power from the power grid 300, converts the three-phase AC power provided by the power grid 300 into DC power, and supplies power to the first full-bridge circuit 130 and the second full-bridge circuit 140. Since the first full-bridge circuit 130 is provided with a first capacitor C1 and the second full-bridge circuit 140 is provided with a second capacitor C2, the large current generated when the converter 230 starts supplying power will cause the first capacitor C1 and the second capacitor C2 to be damaged when charging the first capacitor C1 and the second capacitor C2, thereby damaging the first full-bridge circuit 130 and the second full-bridge circuit 140. In the present application, a soft starter 240 is provided between the converter 230 and the first full-bridge circuit 130 and the second full-bridge circuit 140. When the switch element 250 is closed and the converter 230 starts to supply power, the voltage of the soft starter 240 gradually increases from 0, so that the voltage across the first capacitor C1 and the second capacitor C2 gradually increases, and the first capacitor C1 and the second capacitor C2 are pre-charged, thereby avoiding the generation of a large voltage when the converter 230 starts to supply power, causing the voltage across the first capacitor C1 and the second capacitor C2 to exceed the rated voltage value and be damaged, thereby ensuring the test safety of the first full-bridge circuit 130 and the second full-bridge circuit 140.

[0089] The present application also provides a testing device for an energy storage power device, comprising any one of the above testing devices for an energy storage power device.

[0090] It can be understood that the energy storage power device testing apparatus provided in the embodiment of the present application can achieve the corresponding beneficial effects of any energy storage power device testing device provided in the above-mentioned embodiments, which will not be elaborated here.

[0091] The present application also provides a testing system for an energy storage power device, comprising any one of the above testing devices for the energy storage power device.

[0092] It can be understood that the energy storage power device testing system provided in the embodiment of the present application can achieve the corresponding beneficial effects of the energy storage power device testing device provided in the above-mentioned implementation mode, which will not be elaborated here.

[0093] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0094] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test device for energy storage power devices, characterized in that: include: A DC power supply, electrically connected to a power grid; wherein the power grid is used to supply power to the DC power supply; A power device group to be tested, comprising a first power device, a second power device and a power inductor, wherein an AC side of the first power device and an AC side of the second power device are connected via the power inductor, and a DC side of the first power device and a DC side of the second power device are both electrically connected to the DC power supply; A controller is communicatively connected to the first power device and the second power device; the controller is used to adjust the phase difference between the first power device and the second power device, and control the power device group to be tested to perform active power testing; the controller is also used to adjust the modulation ratio of the first power device and the modulation ratio of the second power device, and control the power device group to be tested to perform reactive power testing.

2. The energy storage power device testing device according to claim 1, characterized in that: The phase angle difference is the phase angle difference between the AC voltage output by the first power device and the AC voltage output by the second power device; the modulation ratio of the first power device is the ratio of the AC side voltage to the DC side voltage of the first power device; the modulation ratio of the second power device is the ratio of the AC side voltage to the DC side voltage of the second power device.

3. The energy storage power device testing device according to claim 1, characterized in that: The first power device includes a first full-bridge circuit, and the second power device includes a second full-bridge circuit; The first end of the first full-bridge circuit and the first end of the second full-bridge circuit are both electrically connected to the first power supply end of the DC power supply, and the second end of the first full-bridge circuit and the second end of the second full-bridge circuit are both electrically connected to the second power supply end of the DC power supply; the third end of the first full-bridge circuit is electrically connected to the fourth end of the second full-bridge circuit through the power inductor, and the fourth end of the first full-bridge circuit is electrically connected to the third end of the second full-bridge circuit; each control end of the first full-bridge circuit and each control end of the second full-bridge circuit are communicatively connected to the controller; Among them, the controller is used to control the on and off of switching devices in the first full-bridge circuit and the second full-bridge circuit, adjust the modulation ratio of the first full-bridge circuit and the modulation ratio of the second full-bridge circuit, and adjust the phase difference between the first full-bridge circuit and the second full-bridge circuit.

4. The energy storage power device testing device according to claim 1, characterized in that: It also includes an operating environment simulation box; the power device group to be tested is arranged in the operating environment simulation box, and the operating environment simulation box is used to simulate the operating environment of the power device group to be tested.

5. The energy storage power device testing device according to claim 4, characterized in that: The operating environment simulation box includes an environmental simulation box; the power device group to be tested is arranged in the environmental simulation box, and the environmental simulation box is used to simulate the environmental conditions in which the power device group to be tested is located under actual working conditions.

6. The energy storage power device testing device according to claim 5, characterized in that: The environmental simulation box includes a temperature detection element and a temperature adjustment element; The temperature detection element is used to detect the temperature in the environmental simulation box, and the temperature adjustment element is used to adjust the temperature in the environmental simulation box to a temperature threshold.

7. The energy storage power device testing device according to claim 5, characterized in that: The environmental simulation box includes a humidity detection element and a humidity adjustment element; The humidity detection element is used to detect the humidity in the environmental simulation box, and the humidity adjustment element is used to adjust the humidity in the environmental simulation box to a humidity threshold.

8. The energy storage power device testing device according to claim 1, characterized in that: It also includes a heat sink, wherein the heat sink is used to reduce the surface temperature of the power device group to be tested.

9. The energy storage power device testing device according to claim 8, characterized in that: The radiator is an air-cooled radiator; the air outlet of the air-cooled radiator is arranged on the surface of one side of the power device group to be tested, and the air-cooled radiator is communicatively connected with the controller.

10. The energy storage power device testing device according to claim 8, characterized in that: The radiator is a water-cooled radiator; a transmission pipeline of the water-cooled radiator is arranged on a surface of one side of the power device group to be tested, and the water-cooled radiator is communicatively connected with the controller.

11. The energy storage power device testing device according to claim 1, characterized in that: The DC power supply includes a converter; an input end of the converter is electrically connected to the power grid, and a DC side of the first power device and a DC side of the second power device are electrically connected to an output end of the converter.

12. The energy storage power device testing device according to claim 1, characterized in that: It also includes a soft starter; the DC side of the first power device and the DC side of the second power device are electrically connected to the DC power supply through the soft starter.

13. The energy storage power device testing device according to claim 1, characterized in that: It also includes a switching element; the DC side of the first power device and the DC side of the second power device are electrically connected to the DC power supply through the switching element.

14. A testing device for energy storage power devices, characterized in that: A testing device comprising an energy storage power device as described in any one of claims 1-13.

15. A testing system for energy storage power devices, characterized in that: A testing device comprising the energy storage power device as claimed in claim 14.

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