Energy storage sub-module equivalent power test platform, method and system

Abstract

The invention provides an energy storage sub-module equivalent power test platform, method and system, and the platform comprises an equivalent power test control and protection platform and a power inductor, one end of the power inductor is connected with one end of the AC side of a first to-be-tested energy storage sub-module group, and the other end of the power inductor is connected with a second to-be-tested energy storage sub-module group. The other end of the power inductor is connected with one end of the AC side of a second to-be-tested energy storage sub-module group, and the other end of the AC side of the first to-be-tested energy storage sub-module group is in short circuit with the other end of the AC side of the second to-be-tested energy storage sub-module group. The equivalent power test control and protection platform is in communication connection with the first to-be-tested energy storage sub-module group and the second to-be-tested energy storage sub-module group. The test platform constructed through the equivalent power test control and protection platform and the power inductor has the advantages of being simple in structure and low in construction cost, in addition, according to the test method provided by the invention, the platform controls the to-be-tested energy storage sub-module groups to carry out load performance test according to the power hedging experiment, and the test efficiency is improved. The simple and practical performance test is realized.

Description

Technical Field

[0001] The present invention belongs to the field of energy storage technology, and specifically relates to an energy storage submodule equivalent power test platform, method and system. Background Art

[0002] In recent years, new energy technologies have developed rapidly, and the proportion of new energy generation such as wind power and photovoltaic power has continued to increase. Energy storage is an important technical approach to promote the consumption of new energy. Among them, the modular multi-level topology battery energy storage system (MMC-BESS) is the most widely used energy storage system, which can play the role of grid interconnection, flow control, reactive power decoupling, buffering new energy fluctuations and stabilizing the grid, and therefore has important research and application value.

[0003] At present, in the prior art of testing and inspecting the energy storage submodule (MMC-BESS) in the battery energy storage system, the invention patent with application number CN201310637043.6, "A cascaded energy storage inverter detection platform and its control method", simulates the working characteristics of the battery pack and simulates the remote adjustment instructions issued by the power grid dispatching system, so that the cascaded energy storage inverter has the external conditions required for operation, so that the necessary debugging and inspection work can be completed without using the battery pack. The problems are: the detection platform structure is relatively complex, the construction area is large and the control cost is high, which leads to its low practicality; for the test of simple structure Platform, such as the invention patent "Pair-to-Pair Test System and Method for Cascaded Energy Storage Power Modules" with application number 202210736151.8, which proposes a pair-to-pair test system and method for cascaded energy storage power modules, which includes an active test mode and a reactive test mode, and can complete the power test of two power modules, but the problems it has are: the power modules to be tested cannot be extended, the steps for switching the test modes are cumbersome, and there is a lack of a more comprehensive control test method; in summary, the existing energy storage sub-module test platform has a complex structure and high construction cost, resulting in its low practicality. In addition, the test method for the load performance of the energy storage sub-module is cumbersome and not very practical. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes an energy storage submodule equivalent power test platform, comprising:

[0005] An equivalent power test control and protection platform and a power inductor, wherein one end of the power inductor is connected to one end of the AC side of the first energy storage submodule group to be tested, and the other end of the power inductor is connected to one end of the AC side of the second energy storage submodule group to be tested, and the other end of the AC side of the first energy storage submodule group to be tested is short-circuited with the other end of the AC side of the second energy storage submodule group to be tested, and the equivalent power test control and protection platform is respectively connected to the first energy storage submodule group to be tested and the second energy storage submodule group to be tested for communication;

[0006] The equivalent power test control and protection platform is used to perform a power hedging test according to the power hedging test requirements by controlling the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested, obtain power test data, and verify the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data.

[0007] Preferably, the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes one or more energy storage submodules to be tested. When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes multiple energy storage submodules to be tested, the energy storage submodules to be tested are cascaded.

[0008] Preferably, it is characterized in that the energy storage submodule under test comprises: a modular multi-level power submodule, an interface circuit and an energy storage medium, wherein the energy storage medium is connected to the interface circuit and to the DC side of the modular multi-level power submodule in sequence;

[0009] When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes one energy storage submodule to be tested, one end of the AC side of the modular multi-level power submodule is connected to the power inductor and the other end is short-connected to one side of another energy storage submodule group to be tested;

[0010] When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes a plurality of energy storage submodules to be tested and the energy storage submodule to be tested is located at a side connected to the power inductor, one end of the AC side of the modular multi-level power submodule in the energy storage submodule to be tested is connected to the power inductor, and the other end is cascaded with one end of the AC side of the multi-level power submodule in another energy storage submodule to be tested in the energy storage submodule group to which it belongs;

[0011] When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes a plurality of energy storage submodules to be tested and the energy storage submodule to be tested is located at a side short-circuited with another energy storage submodule group to be tested, one end of the AC side of the modular multi-level power submodule in the energy storage submodule to be tested is short-circuited with one side of another energy storage submodule group to be tested, and the other end is cascaded with one end of the AC side of the multi-level power submodule in another energy storage submodule to be tested in the energy storage submodule group to be tested;

[0012] When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes multiple energy storage submodules to be tested and the energy storage submodule to be tested is not connected to another energy storage submodule group to be tested or a power inductor, the AC side of the modular multi-level power submodule in the energy storage submodule to be tested is cascaded with the AC sides of the multi-level power submodules in the remaining energy storage submodules to be tested in the energy storage submodule group to which it belongs.

[0013] Based on the same inventive concept, the present invention application also proposes a method for testing the equivalent power of an energy storage submodule, comprising:

[0014] According to the power hedging test requirements, the equivalent power test control and protection platform and the power inductor in the energy storage submodule equivalent power test platform are used to control the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested to perform a power hedging test and obtain power test data;

[0015] Verifying the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data;

[0016] Wherein, the power hedging test requirement is determined according to a power hedging algorithm, and the energy storage submodule equivalent power test platform is an energy storage submodule equivalent power test platform as described in any one of claims 1 to 3.

[0017] Preferably, the power hedge test requirements include one or more of the following: active power hedge test requirements, reactive power hedge test requirements, DC power hedge test requirements and overload protection test requirements; the circuit signal parameters include one or more of the following: phase angle, modulation ratio and DC bias; the power test data includes one or more of the following: active continuous load operation data, reactive continuous load operation data, DC continuous load operation data and overload protection test data.

[0018] Preferably, the power hedging test is performed by controlling the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested through the equivalent power test control and protection platform and the power inductor in the energy storage submodule equivalent power test platform according to the power hedging test requirements to obtain power test data, including:

[0019] Initializing the phase angle, modulation ratio and DC bias of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested respectively through the equivalent power test control and protection platform based on preset values;

[0020] According to the active power hedge test requirements, the difference between the phase angle of the first energy storage submodule group to be tested and the phase angle of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the active current reaches a first preset value, and an active power continuous load test is performed to obtain active continuous load operation data;

[0021] According to the reactive power hedge test requirements, the difference between the modulation ratio of the first energy storage submodule group to be tested and the modulation ratio of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the reactive current reaches a second preset value, and a reactive power continuous load test is performed to obtain reactive continuous load operation data;

[0022] According to the DC power hedge test requirements, the difference between the DC bias of the first energy storage submodule group to be tested and the DC bias of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the DC current reaches a third preset value, and a DC power continuous load test is performed to obtain DC continuous load operation data;

[0023] According to the overload protection test requirements, the difference between the phase angles, the difference between the modulation ratios and the difference between the DC biases are respectively controlled to increase to the energy storage submodule equivalent power test platform to perform overcurrent protection action, and obtain overload protection test data through the equivalent power test control platform and the power inductor;

[0024] The numerical changes of the active power, reactive power and DC power are determined according to a power hedging algorithm.

[0025] Preferably, the overload protection test data includes: active overload protection test data, reactive overload protection test data and DC overload protection test data. According to the overload protection test requirements, the difference between the phase angles, the difference between the modulation ratios and the difference between the DC biases are respectively controlled to increase to the energy storage submodule equivalent power test platform to perform overcurrent protection action, and the overload protection test data is obtained, including:

[0026] According to the overload protection test requirements, the difference between the phase angles is controlled to increase through the equivalent power test control and protection platform and the power inductor until the active power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining active overload protection test data;

[0027] According to the overload protection test requirements, the difference between the modulation ratios is controlled to increase through the equivalent power test control and protection platform and the power inductor until the reactive power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining reactive overload protection test data;

[0028] According to the overload protection test requirements, the difference between the DC bias is controlled to increase through the equivalent power test control and protection platform and the power inductor until the DC power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining DC overload protection test data.

[0029] Preferably, the load performance includes: continuous load capacity and overload protection capability, and the verifying the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data includes:

[0030] Verifying the continuous load capacity of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on any one or more of the active continuous load operation data, the reactive continuous load operation data or the DC continuous load operation data;

[0031] Based on any one or more of the active overload protection test data, reactive overload protection test data or DC overload protection test data, the overload protection capabilities of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested are verified.

[0032] Preferably, the expression of the active power is as follows:

[0033]

[0034] Where: P is the active power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; δ1 is the phase angle of the first energy storage submodule group to be tested; δ2 is the phase angle of the second energy storage submodule group to be tested; E is the DC side equivalent terminal voltage; X L is the inductive reactance of the power inductor;

[0035] The expression of reactive power is as follows:

[0036]

[0037] Where: Q is reactive power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; E is the equivalent terminal voltage on the DC side; X L is the inductive reactance of the power inductor;

[0038] The expression of the DC power is as follows:

[0039] P dc =(U dc1 -U dc2 ) 2 / R L

[0040] Where: P dc is the DC power; U dc1 is the DC bias of the output voltage of the first energy storage submodule group to be tested, U dc2 is the DC bias of the output voltage of the second energy storage submodule group to be tested; R L is the internal resistance of the power inductor.

[0041] Based on the same inventive concept, the present invention also provides an energy storage submodule equivalent power test system, comprising:

[0042] Power hedging test module: used to control the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested to perform power hedging test and obtain power test data through the equivalent power test control and protection platform and power inductor in the energy storage submodule equivalent power test platform according to the power hedging test requirements;

[0043] A load performance verification module: used to verify the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data;

[0044] Wherein, the power hedging test requirement is determined according to a power hedging algorithm, and the energy storage submodule equivalent power test platform is an energy storage submodule equivalent power test platform as described in any one of claims 1 to 3.

[0045] Preferably, the power hedge test requirements in the power hedge test module include one or more of the following: active power hedge test requirements, reactive power hedge test requirements, DC power hedge test requirements and overload protection test requirements; the circuit signal parameters include one or more of the following: phase angle, modulation ratio and DC bias; the power test data includes one or more of the following: active continuous load operation data, reactive continuous load operation data, DC continuous load operation data and overload protection test data.

[0046] Preferably, the power hedging test module is specifically used for:

[0047] Initializing the phase angle, modulation ratio and DC bias of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested respectively through the equivalent power test control and protection platform based on preset values;

[0048] According to the active power hedge test requirements, the difference between the phase angle of the first energy storage submodule group to be tested and the phase angle of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the active current reaches a first preset value, and an active power continuous load test is performed to obtain active continuous load operation data;

[0049] According to the reactive power hedge test requirements, the difference between the modulation ratio of the first energy storage submodule group to be tested and the modulation ratio of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the reactive current reaches a second preset value, and a reactive power continuous load test is performed to obtain reactive continuous load operation data;

[0050] According to the DC power hedge test requirements, the difference between the DC bias of the first energy storage submodule group to be tested and the DC bias of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the DC current reaches a third preset value, and a DC power continuous load test is performed to obtain DC continuous load operation data;

[0051] According to the overload protection test requirements, the difference between the phase angles, the difference between the modulation ratios and the difference between the DC biases are respectively controlled to increase to the energy storage submodule equivalent power test platform to perform overcurrent protection action, and obtain overload protection test data through the equivalent power test control platform and the power inductor;

[0052] The numerical changes of the active power, reactive power and DC power are determined according to a power hedging algorithm.

[0053] Preferably, the overload protection test data in the power hedging test module includes: active overload protection test data, reactive overload protection test data and DC overload protection test data, and the power hedging test module is used to:

[0054] According to the overload protection test requirements, the difference between the phase angles is controlled to increase through the equivalent power test control and protection platform and the power inductor until the active power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining active overload protection test data;

[0055] According to the overload protection test requirements, the difference between the modulation ratios is controlled to increase through the equivalent power test control and protection platform and the power inductor until the reactive power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining reactive overload protection test data;

[0056] According to the overload protection test requirements, the difference between the DC bias is controlled to increase through the equivalent power test control and protection platform and the power inductor until the DC power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining DC overload protection test data.

[0057] Preferably, the load performance in the load performance verification module includes: continuous load carrying capacity and overload protection capacity, and the load performance verification module is specifically used for:

[0058] Verifying the continuous load capacity of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on any one or more of the active continuous load operation data, the reactive continuous load operation data or the DC continuous load operation data;

[0059] Based on any one or more of the active overload protection test data, reactive overload protection test data or DC overload protection test data, the overload protection capabilities of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested are verified.

[0060] Preferably, the expression of active power in the power hedging test module is as follows:

[0061]

[0062] Where: P is the active power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; δ1 is the phase angle of the first energy storage submodule group to be tested; δ2 is the phase angle of the second energy storage submodule group to be tested; E is the DC side equivalent terminal voltage; X L is the inductive reactance of the power inductor;

[0063] The expression of reactive power is as follows:

[0064]

[0065] Where: Q is reactive power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; E is the equivalent terminal voltage on the DC side; X L is the inductive reactance of the power inductor;

[0066] The expression of the DC power is as follows:

[0067] P dc =(U dc1 -U dc2 ) 2 / R L

[0068] Where: P dc is the DC power; U dc1is the DC bias of the output voltage of the first energy storage submodule group to be tested, U dc2 is the DC bias of the output voltage of the second energy storage submodule group to be tested; R L is the internal resistance of the power inductor.

[0069] Based on the same inventive concept, the present invention application also proposes a computer device, including: one or more processors;

[0070] A memory for storing one or more programs;

[0071] When the one or more programs are executed by the one or more processors, an energy storage submodule equivalent power testing method as described above is implemented.

[0072] Based on the same inventive concept, the present invention application also proposes a computer-readable storage medium, characterized in that a computer program is stored thereon, and when the computer program is executed, an energy storage submodule equivalent power testing method as described above is implemented.

[0073] Compared with the closest prior art, the present invention has the following beneficial effects:

[0074] The present invention application provides an energy storage submodule equivalent power test platform, comprising: an equivalent power test control and protection platform and a power inductor, wherein one end of the power inductor is connected to one end of the AC side of a first energy storage submodule group to be tested, and the other end of the power inductor is connected to one end of the AC side of a second energy storage submodule group to be tested, and the other end of the AC side of the first energy storage submodule group to be tested is short-circuited with the other end of the AC side of the second energy storage submodule group to be tested, and the equivalent power test control and protection platform is respectively communicatively connected with the first energy storage submodule group to be tested and the second energy storage submodule group to be tested; the energy storage submodule test platform constructed by the present invention using the equivalent power test control and protection platform and the power inductor has the advantages of simple structure and low construction cost.

[0075] The present invention application also provides an energy storage submodule equivalent power test method and system, including: according to the power hedging test requirements, through the equivalent power test control and protection platform and power inductor in the energy storage submodule equivalent power test platform, controlling the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested to perform a power hedging test, and obtaining power test data; based on the power test data, verifying the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested; the present invention application controls the circuit signal parameters of each energy storage submodule group to be tested according to the power hedging test requirements through the power test platform to perform a power hedging test, and verifies its load performance, thereby realizing a simple and practical energy storage submodule performance test. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 A schematic diagram of an energy storage submodule equivalent power test platform provided by the present invention;

[0077] Figure 2 A schematic diagram of an equivalent power test platform for an MMC structure energy storage submodule provided by the present invention;

[0078] Figure 3 A schematic diagram of the structure of an energy storage submodule provided by the present invention, which uses a bidirectional DC / DC circuit as an interface circuit and a supercapacitor as an energy storage medium;

[0079] Figure 4 A schematic diagram of the structure of an energy storage submodule provided by the present invention, which uses a battery as an energy storage medium and a filter inductor as an interface circuit;

[0080] Figure 5 A circuit diagram of an equivalent power test platform provided by the present invention;

[0081] Figure 6 An equivalent circuit diagram of an equivalent power test platform provided by the present invention;

[0082] Figure 7 A flow chart of an energy storage submodule equivalent power testing method provided by the present invention;

[0083] Figure 8 A structural diagram of an energy storage submodule equivalent power test system provided in the present invention application. DETAILED DESCRIPTION

[0084] The specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings.

[0085] Embodiment 1:

[0086] The present invention proposes an energy storage submodule equivalent power test platform, comprising: an equivalent power test control and protection platform and a power inductor, wherein one end of the power inductor is connected to one end of the AC side of a first energy storage submodule group to be tested, and the other end of the power inductor is connected to one end of the AC side of a second energy storage submodule group to be tested, and the other end of the AC side of the first energy storage submodule group to be tested is short-circuited with the other end of the AC side of the second energy storage submodule group to be tested, and the equivalent power test control and protection platform is respectively connected to the first energy storage submodule group to be tested and the second energy storage submodule group to be tested for communication;

[0087] The equivalent power test control and protection platform is used to perform a power hedging test according to the power hedging test requirements by controlling the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested, obtain power test data, and verify the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data.

[0088] Specifically, in the embodiments of the present disclosure, Figure 1 As shown, the energy storage submodule equivalent power test platform proposed in the present invention application includes two parts: a power inductor and an equivalent power test control and protection platform. The figure also includes a first energy storage submodule group to be tested and a second energy storage submodule group to be tested connected to the platform. The test platform proposed in the present invention application can perform a 1-to-1 test, that is, each energy storage submodule group to be tested has only one energy storage submodule to be tested; it can also perform a 1-to-many test, that is, one of the two energy storage submodule groups to be tested has one energy storage submodule, and the other energy storage submodule group to be tested has N energy storage submodules; or it can perform a multi-to-many test, that is, both of the two energy storage submodule groups to be tested have N energy storage submodules, where N is an integer greater than or equal to 2.

[0089] The structures of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested are as follows: Figure 2 As shown in FIG. , it specifically includes a modular multi-level power module. Figure 2 It consists of three parts: MMC power submodule, interface circuit, and energy storage medium (including BMS). Among them, the modular multi-level power module can be Figure 3 The modular multi-level (MMC) full-bridge submodule shown can also be Figure 4 The modular multi-level (MMC) half-bridge submodule shown; the energy storage medium can be Figure 3 The supercapacitor in Figure 4 The battery in the interface circuit can be Figure 3 The bidirectional DC / DC module in Figure 4 It should be noted that the modular multi-level (MMC) power submodule, energy storage medium and interface circuit in the present invention application can be flexibly configured according to actual engineering requirements and are not limited to the above-mentioned ones.

[0090] When the two energy storage submodule groups to be tested in the present invention application include only one energy storage submodule to be tested, one end of the AC side of the modular multi-level power submodule is connected to the power inductor and the other end is short-circuited to one side of the other energy storage submodule group to be tested. When the two energy storage submodule groups to be tested in the present invention application include multiple energy storage submodules to be tested, if the energy storage submodule to be tested is located on the side connected to the power inductor, then one end of the AC side of the modular multi-level power submodule in the energy storage submodule to be tested is connected to the power inductor, and the other end is cascaded with one end of the AC side of the multi-level power submodule in another energy storage submodule to be tested in the energy storage submodule group to which it belongs; if the energy storage submodule to be tested is located on the side short-circuited to another energy storage submodule group to be tested, then the energy storage submodule to be tested One end of the AC side of the modular multi-level power submodule in the energy storage submodule to be tested is short-connected to one side of another energy storage submodule group to be tested, and the other end is cascaded with one end of the AC side of the multi-level power submodule in another energy storage submodule to be tested in the energy storage submodule group to be tested; if the energy storage submodule to be tested is not connected to another energy storage submodule group to be tested or a power inductor, the AC side of the modular multi-level power submodule in the energy storage submodule to be tested is cascaded with the AC sides of the multi-level power submodules in the remaining energy storage submodules to be tested in the energy storage submodule group to be tested.

[0091] In the disclosed embodiment, the energy storage submodule group under test and the equivalent power test control and protection platform can be connected via a corresponding control circuit, or can be connected via a controller area network (CAN) or RS485 or optical fiber, etc., to achieve two-way transmission of control and monitoring information.

[0092] The present invention also provides a specific embodiment, as shown in the attached Figure 5 As shown in the figure, it is a 1-to-1 energy storage submodule equivalent power test platform including: power inductor L and equivalent power test control and protection platform. In addition, there is a group of energy storage submodules to be tested connected to the platform, which are respectively MMC half-bridge energy storage submodule 1 to be tested and MMC half-bridge energy storage submodule 2 to be tested in the figure. In the embodiment of the present disclosure, the energy storage medium is selected as a battery, and the terminal voltages of the two groups of batteries are the same, both E bat ; The filter inductors selected for the interface circuit are L1 and L2. One end of the AC side of the two energy storage submodule groups to be tested is connected through the power inductor L, and the other end is directly short-circuited. The two energy storage submodule groups to be tested and the equivalent power test control and protection platform are connected through optical fiber to transmit control and monitoring information in both directions. In order to reduce the impact on the DC support capacitor C1 / C2 during the power-on process of the test platform, a slow-start circuit is added between the battery and the DC capacitor, which are circuit breakers QF1 / QF2, slow-start resistors R1 / R2, and bypass contactors K1 / K2. Usually, this part of the slow-start circuit is provided by the battery itself and is included in the entire battery cluster, and does not need to be added separately.

[0093] In the present invention, the power hedging test is performed by controlling the energy storage submodule group to be tested through the equivalent power test control and protection platform. The power hedging test is formulated according to the power hedging control algorithm. The power hedging test mainly realizes the exchange of active power, reactive power and DC power between the energy storage submodules to be tested by controlling the modulation ratio, phase angle and DC bias parameter control mode of the energy storage submodule group to be tested, so as to realize the inspection of the performance of the energy storage submodule group to be tested. The specific power hedging control algorithm is as follows:

[0094] The output voltage of the two energy storage submodule groups under test is expressed as follows:

[0095]

[0096] Where: u out1 u is the AC side output voltage of the first energy storage submodule group to be tested; out2 is the output voltage on the AC side of the second energy storage submodule group to be tested; ω is the angular velocity; t is the time; E1 is the equivalent terminal voltage of the energy storage medium on the DC side of the first energy storage submodule group to be tested; E2 is the equivalent terminal voltage of the energy storage medium on the DC side of the second energy storage submodule group to be tested, usually E1=E2=E; U1 is the effective value of the output voltage on the AC side of the first energy storage submodule group to be tested; U2 is the effective value of the output voltage on the AC side of the second energy storage submodule group to be tested; M1 is the modulation ratio of the first energy storage submodule group to be tested; δ1 is the phase angle of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; δ2 is the phase angle of the second energy storage submodule group to be tested; U dc1 is the DC bias in the output voltage of the energy storage submodule 1 to be tested; U dc2 is the DC bias in the output voltage of the second energy storage submodule group to be tested. Theoretically, U dc1 ≤E,U dc2 ≤E.

[0097] The energy storage submodule group to be tested can be equivalent to a controlled voltage source, and the equivalent power test platform can be equivalent to two voltage sources connected by power inductors, as shown in the following example. Figure 6 As shown, the active power P, reactive power Q, and DC power P exchanged between the two energy storage submodules to be tested dc They are:

[0098]

[0099] Where: P is active power; U1 is the effective value of the AC side output voltage of the first energy storage submodule group to be tested; U2 is the effective value of the AC side output voltage of the second energy storage submodule group to be tested; δ is the phase angle difference between the first energy storage submodule group to be tested and 2; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; δ1 is the phase angle of the first energy storage submodule group to be tested; δ2 is the phase angle of the second energy storage submodule group to be tested; E is the DC side equivalent terminal voltage; X L is the inductive reactance of the power inductor; Q is the reactive power; P dc is the DC power; U dc1 is the DC bias of the output voltage of the first energy storage submodule group to be tested, U dc2 is the DC bias of the output voltage of the second energy storage submodule group to be tested; R L is the internal resistance of the power inductor.

[0100] The parameter difference between the two energy storage submodules to be tested in formula (2) can cause changes in the active power, reactive power and DC power in the system, and the following conclusions can be obtained:

[0101] (1) If the modulation ratios M1 and M2 of the two energy storage submodules to be tested remain unchanged, the two DC biases U dc1 =U dc2 By adjusting the phase angles δ1 and δ2 of the two energy storage module groups to be tested, the active power exchanged between the two energy storage submodules can be adjusted, and the direction of the active power can be changed by changing the leading or lagging relationship of the phase angles δ1 and δ2.

[0102] (2) If the modulation ratio M1 of the first energy storage submodule group to be tested is kept unchanged, the two DC biases U dc1 =U dc2 , two phase angles δ1=δ2, by adjusting the second energy storage submodule group to be tested M2, the reactive power exchanged between the two energy storage submodule groups can be adjusted, and by changing the corresponding relationship between M1 and M2, the direction of the reactive power can be changed.

[0103] (3) If two DC biases U dc1 =U dc2 By changing the modulation ratio M1, M2 and the phase angle δ1, δ2 at the same time, the size and direction of the active power and reactive power exchanged between the energy storage sub-modules can be adjusted at the same time.

[0104] (4) If the modulation ratios M1 and M2 remain unchanged, the phase angle δ1 = δ2, and the DC bias U is adjusted dc1 ,U dc2 The size and direction of the DC power exchanged between the two energy storage sub-modules can be adjusted.

[0105] (5) When the equivalent power test protection function is complete, the inter-module current can be increased to the overcurrent protection level by adjusting the active power or reactive power to verify the temporary overload operation capability of the energy storage submodule.

[0106] According to the above conclusions, a power hedging test can be designed, power test data can be obtained through the test, and the continuous load capacity and overload protection capability of the energy storage sub-module group to be tested can be verified based on the power test data. When conducting a power hedging experiment, the control algorithm is simple, and only the amplitude and phase of the output voltage of the energy storage sub-module group to be tested need to be open-loop controlled. No additional grid-connected operation control and voltage balancing control are required, so the actual operating conditions of the energy storage sub-module can be simulated to the greatest extent.

[0107] The energy storage submodule equivalent power test platform proposed in the present invention application does not require the construction of a whole machine test platform. It only needs to control two energy storage submodule groups to be tested through an equivalent power test control and protection platform, and conduct a power hedging experiment between them, so as to verify the continuous load capacity and the maximum temporary overload operation capacity of the energy storage submodule group. It has a simple structure, a small footprint, and a low economic cost. In addition, since the test is only carried out between two groups of energy storage submodule groups to be tested, the loss caused by the flow of power is small, the energy consumption is low, and the practicability is strong. In summary, in the present invention application, the energy storage medium of the energy storage submodule can be used to complete the test, and no external primary power supply is required, which eliminates the cumbersomeness of the operation process and provides a simple and practical energy storage submodule equivalent power test platform.

[0108] Embodiment 2:

[0109] Based on the same inventive concept, the present invention also proposes a method for testing the equivalent power of an energy storage submodule, the flow chart of which is as follows: Figure 7 As shown, including:

[0110] Step 1: According to the power hedging test requirements, the equivalent power test control and protection platform in the energy storage submodule equivalent power test platform controls the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested to perform a power hedging test and obtain power test data;

[0111] Step 2: verifying the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data;

[0112] Among them, the power hedging test requirement is determined according to the power hedging algorithm, and the energy storage submodule equivalent power test platform is the above-mentioned energy storage submodule equivalent power test platform.

[0113] Specifically, the power hedge test requirements in step 1 include one or more of the following: active power hedge test requirements, reactive power hedge test requirements, DC power hedge test requirements and overload protection test requirements. According to the test requirements of active, reactive, DC and overload protection, a power hedge experiment is performed. The circuit signal parameters of the energy storage submodule group to be tested are controlled by the equivalent power test control and protection platform to perform a power hedge test. Among them, the circuit signal parameters include: phase angle, modulation ratio and DC bias.

[0114] The specific steps of the power hedging test are as follows. In the disclosed embodiment, the first energy storage submodule group to be tested and the second energy storage submodule group to be tested are MMC half-bridge submodule 1 and MMC half-bridge submodule 2. It should be noted that in the present embodiment, only the specific implementation method of the MMC half-bridge 1-to-1 energy storage submodule equivalent power test platform is elaborated in detail. Other energy storage submodule equivalent power test platforms such as MMC full-bridge 1-to-many or multi-to-many are all within the protection scope of the present invention application.

[0115] First, start the test platform: the secondary control power of the equivalent power test control and protection platform is powered on, and after detecting that all self-test information of the test platform is normal, the device enters the ready state; keep the two MMC half-bridge sub-modules in a locked state; the control and protection platform automatically closes the circuit breaker QF1 / QF2, and the battery charges the DC / AC DC support capacitor C1 / C2 through the slow-start resistor R1 / R2; when the control and protection platform detects that the DC voltage of C1 / C2 is normal and the total DC voltage is greater than the set value, the control automatically closes the bypass contactor K1 / K2 and bypasses the slow-start resistor R1 / R2; the test platform startup is complete.

[0116] The equivalent power test platform applied in the present invention adjusts the active current on the AC side by controlling the phase difference of the output AC voltage of the two energy storage submodules under test. According to the active power hedge test requirements, the initial phase angle δ1 of the energy storage submodule 1 under test is set to 0, and the initial phase angle δ2 of the energy storage submodule 2 under test is set to δ, where δ can be set by the equivalent power test control and protection platform. The specific test steps are as follows:

[0117] (1) After the DC support capacitors C1 / C2 of the MMC half-bridge submodule are charged, the modulation ratio M1=M2=1, δ=0, and U dc1 =U dc2 ;

[0118] (2) Unlock the control pulses of the MMC half-bridge submodule 1 / 2 and observe the no-load operation status of the test platform;

[0119] (3) After the platform operates normally without load, gradually increase the parameter value of the phase angle difference until the active current output on the AC side reaches a first preset value and continues to operate for a specified time to obtain active continuous load operation data and verify the continuous load capacity of the MMC half-bridge submodule;

[0120] (4) Continue to increase the parameter value of the phase angle difference δ until the energy storage submodule equivalent power test platform proposed in the present application performs overcurrent protection action to verify the overload protection capability of the MMC half-bridge submodule;

[0121] (5) After the test, the pulse blocking state of the MMC half-bridge submodule is restored.

[0122] The equivalent power test platform applied in the present invention adjusts the reactive current on the AC side by controlling the amplitude difference between the AC voltages output by the two tested energy storage submodule groups. According to the reactive power hedge test requirements, the specific test steps are as follows:

[0123] (1) After the DC support capacitors C1 / C2 of the MMC half-bridge submodule are charged, the modulation ratio M1=M2=1, δ=0, and U dc1 =U dc2 ;

[0124] (2) Unlock the control pulses of the MMC half-bridge submodule 1 / 2 and observe the no-load operation status of the test platform;

[0125] (3) After the platform operates normally without load, gradually reduce the parameter value of the modulation ratio M2 until the reactive current output on the AC side reaches a second preset value and continues to operate for a specified time to obtain reactive continuous load operation data and verify the continuous load capacity of the MMC half-bridge submodule;

[0126] (4) Continue to reduce the parameter value of the modulation ratio M2 until the energy storage submodule equivalent power test platform proposed in the present application performs overcurrent protection action to verify the overload protection capability of the MMC half-bridge submodule;

[0127] (5) After the test, the pulse blocking state of the MMC half-bridge submodule is restored.

[0128] The equivalent power test platform applied in the present invention adjusts the DC current by controlling the DC bias of the output AC voltage of the two energy storage submodule groups under test, namely the MMC half-bridge submodules. According to the DC power hedge test requirements, the specific test steps are as follows:

[0129] (1) After the DC support capacitors C1 / C2 of the MMC half-bridge submodule are charged, the modulation ratio M1=M2=1, δ=0, and U dc1 =U dc2 ;

[0130] (2) Unlock the control pulses of the MMC half-bridge submodule 1 / 2 and observe the no-load operation status of the test platform;

[0131] (3) After the platform runs normally without load, gradually increase U dc1 ,U dc2 The DC current is adjusted according to the difference between the DC current and the load current until the DC current reaches a third preset value and continues to run for a specified time to obtain DC continuous load operation data and verify the continuous load capacity of the MMC half-bridge submodule;

[0132] (4) Continue to increase the parameter value of the phase angle difference δ until the energy storage submodule equivalent power test platform proposed in the present application performs overcurrent protection action to verify the overload protection capability of the MMC half-bridge submodule;

[0133] (5) After the test, the pulse blocking state of the MMC half-bridge submodule is restored.

[0134] Finally, the exit process of the energy storage submodule equivalent power test platform includes the following steps: locking the control pulse of the MMC half-bridge submodule, the control and protection platform controls the automatic disconnection of the circuit breaker QF1 / QF2, and controls the battery to exit. After that, wait for about 5 minutes, the DC support capacitor C1 / C2 of the MMC half-bridge submodule is discharged, and finally, all secondary power supplies are turned off and the platform exits.

[0135] According to the power test data, verify the load performance of the energy storage submodule group to be tested, including:

[0136] Verifying the continuous load capacity of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on any one or more of the active continuous load operation data, the reactive continuous load operation data or the DC continuous load operation data;

[0137] Based on any one or more of the active overload protection test data, reactive overload protection test data or DC overload protection test data, the overload protection capabilities of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested are verified.

[0138] In the present invention application, the final verification of the load performance results of the energy storage submodule group to be tested is to verify the correctness of the complete set design of the module. In theory, it should be tested under actual application conditions, but because the module has universality, its actual operating conditions are uncertain, so you can choose the worst or most complex or required test conditions under different conditions for testing, for example: only perform active power hedge test, or reactive power hedge test, or DC power hedge test. If you want to more accurately verify the continuous load performance of the energy storage submodule to be tested, you can choose any two of the three conditions of active, reactive and DC, or all three conditions for testing, and verify it based on the obtained continuous load operation data, which is more convincing; and for the overload protection performance test, at least one of the active, reactive and DC conditions can be tested, and the overload data under multiple conditions can make the data more credible.

[0139] The present invention applies to control the circuit signal parameters of the energy storage submodule group to be tested through an equivalent power test control and protection platform, conduct power hedging test, and verify the load performance of the energy storage submodule group to be tested based on active, reactive, DC and overload protection test data, thereby realizing a comprehensive load performance test of the energy storage submodule group to be tested, and the method is simple and practical.

[0140] Embodiment 3:

[0141] Based on the same inventive concept, the present invention application also provides an energy storage submodule equivalent power testing system.

[0142] The system structure is as follows Figure 8 As shown, including:

[0143] Power hedging test module: used to control the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested to perform power hedging test and obtain power test data through the equivalent power test control and protection platform and power inductor in the energy storage submodule equivalent power test platform according to the power hedging test requirements;

[0144] A load performance verification module: used to verify the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data;

[0145] Wherein, the power hedging test requirement is determined according to a power hedging algorithm, and the energy storage submodule equivalent power test platform is an energy storage submodule equivalent power test platform as described in any one of claims 1 to 3.

[0146] Preferably, the power hedge test requirements in the power hedge test module include one or more of the following: active power hedge test requirements, reactive power hedge test requirements, DC power hedge test requirements and overload protection test requirements; the circuit signal parameters include one or more of the following: phase angle, modulation ratio and DC bias; the power test data includes one or more of the following: active continuous load operation data, reactive continuous load operation data, DC continuous load operation data and overload protection test data.

[0147] Preferably, the power hedging test module is specifically used for:

[0148] Initializing the phase angle, modulation ratio and DC bias of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested respectively through the equivalent power test control and protection platform based on preset values;

[0149] According to the active power hedge test requirements, the difference between the phase angle of the first energy storage submodule group to be tested and the phase angle of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the active current reaches a first preset value, and an active power continuous load test is performed to obtain active continuous load operation data;

[0150] According to the reactive power hedge test requirements, the difference between the modulation ratio of the first energy storage submodule group to be tested and the modulation ratio of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the reactive current reaches a second preset value, and a reactive power continuous load test is performed to obtain reactive continuous load operation data;

[0151] According to the DC power hedge test requirements, the difference between the DC bias of the first energy storage submodule group to be tested and the DC bias of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the DC current reaches a third preset value, and a DC power continuous load test is performed to obtain DC continuous load operation data;

[0152] According to the overload protection test requirements, the difference between the phase angles, the difference between the modulation ratios and the difference between the DC biases are respectively controlled to increase to the energy storage submodule equivalent power test platform to perform overcurrent protection action, and obtain overload protection test data through the equivalent power test control platform and the power inductor;

[0153] The numerical changes of the active power, reactive power and DC power are determined according to a power hedging algorithm.

[0154] Preferably, the overload protection test data in the power hedging test module includes: active overload protection test data, reactive overload protection test data and DC overload protection test data, and the power hedging test module is used to:

[0155] According to the overload protection test requirements, the difference between the phase angles is controlled to increase through the equivalent power test control and protection platform and the power inductor until the active power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining active overload protection test data;

[0156] According to the overload protection test requirements, the difference between the modulation ratios is controlled to increase through the equivalent power test control and protection platform and the power inductor until the reactive power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining reactive overload protection test data;

[0157] According to the overload protection test requirements, the difference between the DC bias is controlled to increase through the equivalent power test control and protection platform and the power inductor until the DC power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining DC overload protection test data.

[0158] Preferably, the load performance in the load performance verification module includes: continuous load carrying capacity and overload protection capacity, and the load performance verification module is specifically used for:

[0159] Verifying the continuous load capacity of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on any one or more of the active continuous load operation data, the reactive continuous load operation data or the DC continuous load operation data;

[0160] Based on any one or more of the active overload protection test data, reactive overload protection test data or DC overload protection test data, the overload protection capabilities of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested are verified.

[0161] Preferably, the expression of active power in the power hedging test module is as follows:

[0162]

[0163] Where: P is the active power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; δ1 is the phase angle of the first energy storage submodule group to be tested; δ2 is the phase angle of the second energy storage submodule group to be tested; E is the DC side equivalent terminal voltage; X L is the inductive reactance of the power inductor;

[0164] The expression of reactive power is as follows:

[0165]

[0166] Where: Q is reactive power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; E is the equivalent terminal voltage on the DC side; X L is the inductive reactance of the power inductor;

[0167] The expression of the DC power is as follows:

[0168] P dc =(U dc1 -U dc2 ) 2 / R L

[0169] Where: P dc is the DC power; U dc1 is the DC bias of the output voltage of the first energy storage submodule group to be tested, U dc2 is the DC bias of the output voltage of the second energy storage submodule group to be tested; R L is the internal resistance of the power inductor.

[0170] The present invention provides an energy storage submodule equivalent power test system, which performs a power hedging test through a power hedging test module and a load performance verification module, and verifies the load performance of the energy storage submodule group to be tested based on active, reactive, DC and overload protection test data, thereby realizing a comprehensive load performance test of the energy storage submodule group to be tested, and providing an energy storage submodule test system with a simple test structure and operation and low economic cost.

[0171] Those skilled in the art will appreciate that the embodiments of the present invention application can be provided as methods, systems, or computer program products. Therefore, the present invention application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present invention application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0172] The present invention application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0173] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0174] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0175] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention application rather than to limit its protection scope. Although the present invention application is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present invention application, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. An energy storage submodule equivalent power test platform, characterized in that: include: An equivalent power test control and protection platform and a power inductor, wherein one end of the power inductor is connected to one end of the AC side of the first energy storage submodule group to be tested, and the other end of the power inductor is connected to one end of the AC side of the second energy storage submodule group to be tested, and the other end of the AC side of the first energy storage submodule group to be tested is short-circuited with the other end of the AC side of the second energy storage submodule group to be tested, and the equivalent power test control and protection platform is respectively connected to the first energy storage submodule group to be tested and the second energy storage submodule group to be tested for communication; The equivalent power test control and protection platform is used to perform a power hedging test according to the power hedging test requirements by controlling the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested, obtain power test data, and verify the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data.

2. The platform according to claim 1, characterized in that The first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes one or more energy storage submodules to be tested. When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes multiple energy storage submodules to be tested, the energy storage submodules to be tested are cascade-connected.

3. The platform according to claim 2, characterized in that: The energy storage submodule under test comprises: a modular multi-level power submodule, an interface circuit and an energy storage medium, wherein the energy storage medium is connected to the interface circuit and to the DC side of the modular multi-level power submodule in sequence; When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes one energy storage submodule to be tested, one end of the AC side of the modular multi-level power submodule is connected to the power inductor and the other end is short-connected to one side of another energy storage submodule group to be tested; When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes a plurality of energy storage submodules to be tested and the energy storage submodule to be tested is located at a side connected to the power inductor, one end of the AC side of the modular multi-level power submodule in the energy storage submodule to be tested is connected to the power inductor, and the other end is cascaded with one end of the AC side of the multi-level power submodule in another energy storage submodule to be tested in the energy storage submodule group to which it belongs; When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes a plurality of energy storage submodules to be tested and the energy storage submodule to be tested is located at a side short-circuited with another energy storage submodule group to be tested, one end of the AC side of the modular multi-level power submodule in the energy storage submodule to be tested is short-circuited with one side of another energy storage submodule group to be tested, and the other end is cascaded with one end of the AC side of the multi-level power submodule in another energy storage submodule to be tested in the energy storage submodule group to be tested; When the first energy storage submodule group to be tested or the second energy storage submodule group to be tested includes multiple energy storage submodules to be tested and the energy storage submodule to be tested is not connected to another energy storage submodule group to be tested or a power inductor, the AC side of the modular multi-level power submodule in the energy storage submodule to be tested is cascaded with the AC sides of the multi-level power submodules in the remaining energy storage submodules to be tested in the energy storage submodule group to which it belongs.

4. A method for testing equivalent power of an energy storage submodule, characterized in that: include: According to the power hedging test requirements, the equivalent power test control and protection platform and the power inductor in the energy storage submodule equivalent power test platform are used to control the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested to perform a power hedging test and obtain power test data; Verifying the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data; Wherein, the power hedging test requirement is determined according to a power hedging algorithm, and the energy storage submodule equivalent power test platform is an energy storage submodule equivalent power test platform as described in any one of claims 1 to 3.

5. The method according to claim 4, characterized in that The power hedge test requirements include one or more of the following: active power hedge test requirements, reactive power hedge test requirements, DC power hedge test requirements and overload protection test requirements; the circuit signal parameters include one or more of the following: phase angle, modulation ratio and DC bias; the power test data includes one or more of the following: active continuous load operation data, reactive continuous load operation data, DC continuous load operation data and overload protection test data.

6. The method according to claim 5, characterized in that According to the power hedging test requirements, the equivalent power test control and protection platform and the power inductor in the energy storage submodule equivalent power test platform are used to control the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested to perform a power hedging test, and obtain power test data, including: Initializing the phase angle, modulation ratio and DC bias of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested respectively through the equivalent power test control and protection platform based on preset values; According to the active power hedge test requirements, the difference between the phase angle of the first energy storage submodule group to be tested and the phase angle of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the active current reaches a first preset value, and an active power continuous load test is performed to obtain active continuous load operation data; According to the reactive power hedge test requirements, the difference between the modulation ratio of the first energy storage submodule group to be tested and the modulation ratio of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the reactive current reaches a second preset value, and a reactive power continuous load test is performed to obtain reactive continuous load operation data; According to the DC power hedge test requirements, the difference between the DC bias of the first energy storage submodule group to be tested and the DC bias of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the DC current reaches a third preset value, and a DC power continuous load test is performed to obtain DC continuous load operation data; According to the overload protection test requirements, the difference between the phase angles, the difference between the modulation ratios and the difference between the DC biases are respectively controlled to increase to the energy storage submodule equivalent power test platform to perform overcurrent protection action, and obtain overload protection test data through the equivalent power test control platform and the power inductor; The numerical changes of the active power, reactive power and DC power are determined according to a power hedging algorithm.

7. The method according to claim 6, characterized in that The overload protection test data includes: active overload protection test data, reactive overload protection test data and DC overload protection test data. According to the overload protection test requirements, the difference between the phase angles, the difference between the modulation ratios and the difference between the DC biases are respectively controlled to increase to the energy storage submodule equivalent power test platform to perform overcurrent protection action, and the overload protection test data is obtained, including: According to the overload protection test requirements, the difference between the phase angles is controlled to increase through the equivalent power test control and protection platform and the power inductor until the active power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining active overload protection test data; According to the overload protection test requirements, the difference between the modulation ratios is controlled to increase through the equivalent power test control and protection platform and the power inductor until the reactive power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining reactive overload protection test data; According to the overload protection test requirements, the difference between the DC bias is controlled to increase through the equivalent power test control and protection platform and the power inductor until the DC power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining DC overload protection test data.

8. The method according to claim 7, characterized in that The load performance includes: continuous load capacity and overload protection capability. The verifying the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data includes: Verifying the continuous load capacity of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on any one or more of the active continuous load operation data, the reactive continuous load operation data or the DC continuous load operation data; Based on any one or more of the active overload protection test data, reactive overload protection test data or DC overload protection test data, the overload protection capabilities of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested are verified.

9. The method according to claim 6, characterized in that The expression of active power is as follows: Where: P is the active power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; δ1 is the phase angle of the first energy storage submodule group to be tested; δ2 is the phase angle of the second energy storage submodule group to be tested; E is the DC side equivalent terminal voltage; X L is the inductive reactance of the power inductor; The expression of reactive power is as follows: Where: Q is reactive power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; E is the equivalent terminal voltage on the DC side; X L is the inductive reactance of the power inductor; The expression of the DC power is as follows: P dc =(U dc1 -U dc2 ) 2 / R L Where: P dc is the DC power; U dc1 is the DC bias of the output voltage of the first energy storage submodule group to be tested, U dc2 is the DC bias of the output voltage of the second energy storage submodule group to be tested; R L is the internal resistance of the power inductor.

10. An energy storage submodule equivalent power test system, characterized in that: include: Power hedging test module: used to control the circuit signal parameters of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested to perform power hedging test and obtain power test data through the equivalent power test control and protection platform and power inductor in the energy storage submodule equivalent power test platform according to the power hedging test requirements; A load performance verification module: used to verify the load performance of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on the power test data; Wherein, the power hedging test requirement is determined according to a power hedging algorithm, and the energy storage submodule equivalent power test platform is an energy storage submodule equivalent power test platform as described in any one of claims 1 to 3.

11. The system according to claim 10, characterized in that The power hedge test requirements in the power hedge test module include one or more of the following: active power hedge test requirements, reactive power hedge test requirements, DC power hedge test requirements and overload protection test requirements; the circuit signal parameters include one or more of the following: phase angle, modulation ratio and DC bias; the power test data includes one or more of the following: active continuous load operation data, reactive continuous load operation data, DC continuous load operation data and overload protection test data.

12. The system according to claim 11, characterized in that The power hedge test module is specifically used for: Initializing the phase angle, modulation ratio and DC bias of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested respectively through the equivalent power test control and protection platform based on preset values; According to the active power hedge test requirements, the difference between the phase angle of the first energy storage submodule group to be tested and the phase angle of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the active current reaches a first preset value, and an active power continuous load test is performed to obtain active continuous load operation data; According to the reactive power hedge test requirements, the difference between the modulation ratio of the first energy storage submodule group to be tested and the modulation ratio of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the reactive current reaches a second preset value, and a reactive power continuous load test is performed to obtain reactive continuous load operation data; According to the DC power hedge test requirements, the difference between the DC bias of the first energy storage submodule group to be tested and the DC bias of the second energy storage submodule group to be tested is controlled to gradually increase through the equivalent power test control and protection platform and the power inductor until the value of the DC current reaches a third preset value, and a DC power continuous load test is performed to obtain DC continuous load operation data; According to the overload protection test requirements, the difference between the phase angles, the difference between the modulation ratios and the difference between the DC biases are respectively controlled to increase to the energy storage submodule equivalent power test platform to perform overcurrent protection action, and obtain overload protection test data through the equivalent power test control platform and the power inductor; The numerical changes of the active power, reactive power and DC power are determined according to a power hedging algorithm.

13. The system according to claim 12, characterized in that The overload protection test data in the power hedging test module includes: active overload protection test data, reactive overload protection test data and DC overload protection test data. The power hedging test module is used to: According to the overload protection test requirements, the difference between the phase angles is controlled to increase through the equivalent power test control and protection platform and the power inductor until the active power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining active overload protection test data; According to the overload protection test requirements, the difference between the modulation ratios is controlled to increase through the equivalent power test control and protection platform and the power inductor until the reactive power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining reactive overload protection test data; According to the overload protection test requirements, the difference between the DC bias is controlled to increase through the equivalent power test control and protection platform and the power inductor until the DC power increases to the energy storage submodule equivalent power test platform to perform overcurrent protection action, thereby obtaining DC overload protection test data.

14. The system according to claim 13, characterized in that The load performance in the load performance verification module includes: continuous load capacity and overload protection capacity. The load performance verification module is specifically used for: Verifying the continuous load capacity of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested based on any one or more of the active continuous load operation data, the reactive continuous load operation data or the DC continuous load operation data; Based on any one or more of the active overload protection test data, reactive overload protection test data or DC overload protection test data, the overload protection capabilities of the first energy storage submodule group to be tested and the second energy storage submodule group to be tested are verified.

15. The system according to claim 11, characterized in that The expression of active power in the power hedge test module is as follows: Where: P is the active power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; δ1 is the phase angle of the first energy storage submodule group to be tested; δ2 is the phase angle of the second energy storage submodule group to be tested; E is the DC side equivalent terminal voltage; X L is the inductive reactance of the power inductor; The expression of reactive power is as follows: Where: Q is reactive power; M1 is the modulation ratio of the first energy storage submodule group to be tested; M2 is the modulation ratio of the second energy storage submodule group to be tested; E is the equivalent terminal voltage on the DC side; X L is the inductive reactance of the power inductor; The expression of the DC power is as follows: P dc =(U dc1 -U dc2 ) 2 / R L Where: P dc is the DC power; U dc1 is the DC bias of the output voltage of the first energy storage submodule group to be tested, U dc2 is the DC bias of the output voltage of the second energy storage submodule group to be tested; R L is the internal resistance of the power inductor.

16. A computer device, characterized in that: include: at least one processor and memory; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, an energy storage submodule equivalent power testing method as described in any one of claims 4 to 9 is implemented.

17. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, an energy storage submodule equivalent power testing method as described in any one of claims 4 to 9 is implemented.

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