A photovoltaic storage converter test system and test method thereof

Abstract

A photovoltaic storage type converter test system and a test method thereof are provided, wherein an AC simulated power grid power supply, a battery simulator, an IV simulator, an RLC load, a data acquisition device, a computer, a switch cabinet CB1 and a switch cabinet CB2 are provided, wherein the AC simulated power grid power supply, the battery simulator, the IV simulator and the RLC load are connected to a device under test, the device under test, the battery simulator and the IV simulator are connected to the data acquisition device, the AC simulated power grid power supply, the battery simulator, the IV simulator and the RLC load are connected to the computer, the switch cabinet CB1 is provided between the AC simulated power grid power supply and the device under test, and the switch cabinet CB2 is provided between the RLC load and the device under test. The present invention can integrate resources without changing the test platform, thereby improving test efficiency, shortening test time and reducing disconnection and wiring time.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic storage converter technology detection, and in particular to a photovoltaic storage converter test system and a test method thereof. Background Art

[0002] The photovoltaic-storage integrated converter (hereinafter referred to as the device under test) refers to a converter that can convert AC power into DC power or store the DC power generated by the photovoltaic array in a battery, and can also convert the DC power generated by the photovoltaic array and the DC power stored in the battery into AC power. At present, it is difficult to set up a test platform for the photovoltaic-storage integrated converter, and it is impossible to achieve automatic / semi-automatic testing when testing the photovoltaic-storage integrated converter, and it is impossible to integrate test equipment. The test platform needs to be repeatedly built for different test items.

[0003] Therefore, in view of the shortcomings of the prior art, it is necessary to provide a photovoltaic storage converter test system to solve the shortcomings of the prior art. Summary of the invention

[0004] One of the purposes of the present invention is to avoid the shortcomings of the prior art and provide a photovoltaic storage type converter test system. The photovoltaic storage type converter test system can integrate resources without changing the test platform, thereby improving test efficiency, shortening test time, and reducing disconnection time.

[0005] The above-mentioned purpose of the present invention is achieved by the following technical measures:

[0006] Provided is a photovoltaic storage type converter test system, which is provided with an AC simulated grid power supply, a battery simulator, an IV simulator, an RLC load, a data acquisition device, a computer, a switch cabinet CB1 and a switch cabinet CB2.

[0007] The AC simulated grid power supply, the battery simulator, the IV simulator and the RLC load are connected to the device under test, the device under test, the battery simulator and the IV simulator are connected to the data acquisition device, the AC simulated grid power supply, the battery simulator, the IV simulator and the RLC load are connected to the computer, the switch cabinet CB1 is arranged between the AC simulated grid power supply and the device under test, and the switch cabinet CB2 is arranged between the RLC load and the device under test.

[0008] The AC simulated grid power supply is used to simulate the grid and provide the device under test with AC side voltage, frequency, and bidirectional flow power.

[0009] The battery simulator is used to simulate the charging performance and discharging performance of the battery.

[0010] The IV simulator is used to simulate a photovoltaic module.

[0011] The data acquisition device is used to collect voltage data and power data.

[0012] The computer is used to control the AC simulated grid power supply, the battery simulator, the IV simulator, the RLC load and the data acquisition device, and issue instructions, receive the voltage data and power data collected by the data acquisition device, and then perform data processing to generate test results.

[0013] The first connection end of the device under test is connected to a connecting wire, which is connected to the first connection end of the AC simulated grid power supply, the connecting wire is connected to, the second connection end of the device under test is connected to the first connection end of the battery simulator, and the third connection end of the device under test is connected to the first connection end of the IV simulator.

[0014] Preferably, the first acquisition end of the above-mentioned data acquisition device is connected to the connecting line, the second acquisition end of the data acquisition device is connected to the connecting line between the second connecting end of the device under test and the first connecting end of the battery simulator, and the third acquisition end of the data acquisition device is connected to the connecting line between the third connecting end of the device under test and the first connecting end of the IV simulator.

[0015] Preferably, the first connection end of the computer is connected to the second connection end of the RLC load via an RS485 or 232 interface, the second connection end of the computer is connected to the second connection end of the AC simulated grid power supply via a BPIB interface, the third connection end of the computer is connected to the second connection end of the IV simulator via a BPIB interface, and the fourth connection end of the computer is connected to the second connection end of the battery simulator via a BPIB interface.

[0016] Preferably, the switch cabinet CB1 is arranged between the first connection end of the AC simulated grid power supply and the connecting line, and the switch cabinet CB2 is arranged between the first connection end of the AC simulated grid power supply and the connecting line.

[0017] The operation modes of the photovoltaic storage inverter test system of the present invention include photovoltaic power generation to the grid side and energy storage discharge grid side test mode under grid-connected operation, energy storage charging from the grid test mode under grid-connected operation, photovoltaic charging to energy storage test mode under off-grid operation, energy storage supply to RLC load test mode under off-grid operation, off-grid operation test mode, grid-connected operation power quality test mode and island test mode.

[0018] The power flow direction or current direction of the photovoltaic power generation to the grid side and the energy storage discharge grid side test mode under grid-connected operation is from the battery simulator and the IV simulator to the AC simulated grid power supply.

[0019] The power flow direction or current direction of the energy storage from the grid charging test mode under grid-connected operation is from the AC simulated grid power supply to the battery simulator.

[0020] The power flow direction or current direction of the photovoltaic energy storage charging test mode under off-grid operation is from the IV simulator to the battery simulator.

[0021] The power flow direction or current direction of the energy storage power supply to the RLC load test mode under off-grid operation is from the battery simulator to the RLC load.

[0022] The power flow direction or current direction of the off-grid operation test mode is from the battery simulator and the IV simulator to the RLC load.

[0023] The power flow direction or current direction of the grid-connected power quality test mode is from the battery simulator and the IV simulator to the AC simulated grid power supply.

[0024] The power flow direction or current direction of the island test mode is from the battery simulator and the IV simulator to the AC simulated grid power source and the RLC load.

[0025] Preferably, the data acquisition device comprises a power analyzer and an oscilloscope.

[0026] Preferably, both the switch cabinet CB1 and the switch cabinet CB2 are remotely controlled to open or close via the computer.

[0027] The model of the battery simulator is IVS-S-2000-2000; the model of the IV simulator is IVS-S-2000-2000; the model of the RLC load is 38000H; the model of the switch cabinet CB1 is CB1; the model of the switch cabinet CB2 is CB2; the model of the power analyzer is WT5000; and the model of the recorder is DL850.

[0028] Another object of the present invention is to avoid the shortcomings of the prior art and provide a method for testing a photovoltaic storage type inverter. The method for testing a photovoltaic storage type inverter can integrate resources without changing the test platform, thereby improving test efficiency, shortening test time, and reducing disconnection time.

[0029] The above-mentioned purpose of the present invention is achieved by the following technical measures:

[0030] A photovoltaic storage type converter testing method is provided, which is performed using the photovoltaic storage type converter testing system mentioned above.

[0031] The photovoltaic storage inverter test method of the present invention includes photovoltaic power generation to the grid side and energy storage discharge grid side test under grid-connected operation, energy storage charging test from the grid under grid-connected operation, photovoltaic charging test for energy storage under off-grid operation, energy storage power supply test for RLC load under off-grid operation, off-grid operation test, grid-connected operation power quality test and island test.

[0032] When conducting the test of photovoltaic power generation to the grid side and energy storage discharge to the grid side under grid-connected operation, the steps include:

[0033] Step a1, closing the switch cabinet CB1 and opening the switch cabinet CB2;

[0034] Step a2, initializing the DC power supply, setting the battery simulator to CV mode, and setting the IV simulator to IV mode;

[0035] Step a3, setting the voltage value, power value and phase of the AC simulated power grid;

[0036] Step a4, setting the voltage value and power value of the battery simulator, setting the voltage value and power value of the IV simulator;

[0037] Step a5, starting the device under test;

[0038] Step a6, delay α;

[0039] Step a7, the data acquisition device continuously collects data of duration β;

[0040] Step a8, determining whether the power collection of all power values ​​is completed under the current voltage value of the battery simulator and the voltage value of the IV simulator, if not, returning to step a4, if yes, proceeding to step a9;

[0041] Step a9, determine whether all voltage value collection of the battery simulator and the IV simulator is completed, if not, return to step a4, if yes, go to step a10;

[0042] Step a10, generating a test report;

[0043] Step a11, end.

[0044] When testing energy storage charging from the grid under grid-connected operation, the steps include:

[0045] Step b1, control the switch cabinet CB1 to close and the switch cabinet CB2 to open;

[0046] Step b2, setting the voltage value, power value and phase of the AC simulated power grid;

[0047] Step b3, initialize the DC power supply, set the battery simulator to CV mode, and set the voltage value and power value of the battery simulator;

[0048] Step b4, starting the device under test;

[0049] Step b5, delay α;

[0050] Step b6, the data acquisition device continuously collects data of duration β;

[0051] Step b7, determine whether the battery simulator completes power collection of all power points at the same voltage value, if not, return to step b3, if yes, go to step b8;

[0052] Step b8, determine whether the battery simulator has completed all voltage value collection, if not, return to step b3, if yes, go to step b9;

[0053] Step b9, generating a test report;

[0054] Step b10, end.

[0055] When testing PV charging of energy storage in off-grid operation, the steps include:

[0056] Step c1, control the switch cabinet CB1 and the switch cabinet CB2 to be disconnected;

[0057] Step c2, initializing the DC power supply, setting the battery simulator to CV mode, and setting the voltage value and power value of the battery simulator;

[0058] Step c3, setting the IV simulator to IV mode;

[0059] Step c4, starting the device under test;

[0060] Step c5, delay α;

[0061] Step c6, the data acquisition device continuously acquires data of duration β;

[0062] Step c7, judging whether the battery simulator has completed power collection of all power points at the same voltage value, if not, returning to step c2, if yes, entering step c8;

[0063] Step c8, determine whether the battery simulator has completed all voltage value collection, if not, return to step c2, if yes, go to step c9;

[0064] Step c9, generating a test report;

[0065] Step c10, end.

[0066] When testing the energy storage supplying power to the RLC load in off-grid operation, the steps include:

[0067] Step d1, control the switch cabinet CB1 to be disconnected and the switch cabinet CB2 to be closed;

[0068] Step d2, initializing the DC power supply and setting the battery simulator to CV mode;

[0069] Step d3, setting the device under test to an off-grid mode, and setting the output voltage value and frequency value of the device under test;

[0070] Step d4, setting the voltage value of the battery simulator;

[0071] Step d5, setting the power value of the RLC load;

[0072] Step d6, delay α;

[0073] Step d7, the data acquisition device continuously collects data of duration β;

[0074] Step d8, determining whether all power values ​​of the RLC load at the same voltage value of the battery simulator have been collected, if not, returning to step d5, if yes, proceeding to step d9;

[0075] Step d9, determine whether the battery simulator has completed all voltage value collection, if not, return to step d4, if yes, go to step d10;

[0076] Step d10, generating a test report;

[0077] Step d11, end.

[0078] When conducting grid-connected power quality testing, the steps include:

[0079] Step e1, control the switch cabinet CB1 to close and the switch cabinet CB2 to open;

[0080] Step e2, initializing the DC power supply, setting the battery simulator to CV mode, and the IV simulator to IV mode;

[0081] Step e3, setting the device under test to a grid-connected mode, and setting the output voltage value and frequency value of the device under test;

[0082] Step e4, setting the voltage value and power value of the battery simulator, setting the voltage value and power value of the IV simulator;

[0083] Step e5, starting the device under test;

[0084] Step e6, delay α;

[0085] Step e7, the data acquisition device continuously collects data of duration β;

[0086] Step e8, judging whether all power values ​​under the voltage value of the current battery simulator and the voltage value of the IV simulator have been collected, if not, returning to step d5, if yes, proceeding to step e9;

[0087] Step e9, determine whether the battery simulator and IV simulator have completed all voltage value acquisitions, if not, return to step e4, if yes, proceed to step e10;

[0088] Step e10, generating a test report;

[0089] Step e11, end.

[0090] When conducting off-grid operation tests, the steps include:

[0091] Step f1, control the switch cabinet CB1 to be disconnected and the switch cabinet CB2 to be closed;

[0092] Step f2, initializing the DC power supply, setting the battery simulator to CV mode, and the IV simulator to IV mode;

[0093] Step f3, setting the device under test to an off-grid mode, and setting the output voltage value and frequency value of the device under test;

[0094] Step f4, setting the voltage value and power value of the battery simulator, setting the voltage value and power value of the IV simulator;

[0095] Step f5, setting the power value of the RLC load;

[0096] Step f6, delay α;

[0097] Step f7, the data acquisition device continuously acquires data of duration β;

[0098] Step f8, judging whether all power values ​​of the RLC load at the current voltage value of the battery simulator and the voltage value of the IV simulator have been collected, if not, returning to step f5, if yes, entering step f9;

[0099] Step f9, determine whether the battery simulator and IV simulator have completed all voltage value acquisitions, if not, return to step f4, if yes, go to step f10;

[0100] Step f10, generating a test report;

[0101] Step f11, end.

[0102] When conducting an island test, the steps include:

[0103] Step g1, initializing the DC power supply, setting the battery simulator to CV mode, and the IV simulator to IV mode;

[0104] Step g2, control the switch cabinet CB2 to close, initialize the AC simulated grid power supply, and set the voltage value of the AC simulated grid power supply;

[0105] Step g3, control the switch cabinet CB1 to close, set the device under test to the grid-connected mode, and set the output power value of the device under test;

[0106] Step g4, setting the power value of the RLC load;

[0107] Step g5, judging by observation whether the power value of the RLC load meets the standard requirements, if it meets the standard requirements, proceeding to step g6, if it does not meet the standard requirements, returning to step g4;

[0108] Step g6, control the switch cabinet CB1 to open, and the wave recorder in the data acquisition device records the waveform output by the device under test and the opening signal of the switch cabinet CB1;

[0109] Step g7, determine the protection time of the device under test, when the protection time is greater than or equal to γ, go to step g8, when the protection time is less than γ, return to step g3;

[0110] Step g8, save data;

[0111] Step g9, determining whether all output power values ​​of the device under test have been tested, if yes, proceeding to step g10, if no, returning to step g3;

[0112] Step g10, generating a test report;

[0113] Step g11, end.

[0114] Preferably, the off-grid operation test is divided into at least one of a voltage deviation test, a frequency deviation test, a voltage harmonic test or a dynamic voltage transient test.

[0115] Preferably, the above-mentioned grid-connected operation power quality test is divided into at least one of a harmonic test, a DC component test, and a three-phase imbalance test.

[0116] Preferably, the above standard requirement is that when the protection time is less than γ, the standard requirement is met, and when the protection time is greater than or equal to γ, the standard requirement is not met.

[0117] Preferably, the above α is 1 min to 3 min.

[0118] Preferably, the above β is 3 min.

[0119] Preferably, the above γ is 2s.

[0120] Preferably, the voltage of the above-mentioned AC simulated grid power supply is 0V~690V, the frequency is 40Hz~70Hz, the phase is 0°~360°, and the capacity is 5MVA.

[0121] Preferably, the voltage of the battery simulator is 0V to 2000V, and the capacity is 2MW.

[0122] Preferably, the voltage of the IV simulator is 0V to 2000V, and the capacity is 2MW.

[0123] A photovoltaic storage type inverter test system and a test method thereof of the present invention are provided with an AC simulated power grid, a battery simulator, an IV simulator, an RLC load, a data acquisition device, a computer, a switch cabinet CB1 and a switch cabinet CB2, wherein the AC simulated power grid, the battery simulator, the IV simulator and the RLC load are connected to a device under test, the device under test, the battery simulator and the IV simulator are connected to the data acquisition device, the AC simulated power grid, the battery simulator, the IV simulator and the RLC load are connected to the computer, the switch cabinet CB1 is arranged between the AC simulated power grid and the device under test, and the The switch cabinet CB2 is arranged between the RLC load and the device under test; the AC simulated grid power supply is used to simulate the grid, and provide the AC side voltage, frequency, and bidirectional flow power for the device under test; the battery simulator is used to simulate the charging performance and discharging performance of the battery; the IV simulator is used to simulate the photovoltaic module; the data acquisition device is used to collect voltage data and power data; the computer is used to control the AC simulated grid power supply, the battery simulator, the IV simulator, the RLC load and the data acquisition device, and issue instructions to receive the voltage data and power data collected by the data acquisition device, and then perform data processing to generate test results. The present invention can integrate resources without changing the test platform, thereby improving test efficiency, shortening test time, and reducing disconnection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0124] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0125] Figure 1 This is a connection diagram of a photovoltaic storage converter test system according to Example 1.

[0126] Figure 2 This is a flow chart of the test of photovoltaic power generation to the grid side and energy storage discharge to the grid side under grid-connected operation in Example 3.

[0127] Figure 3 This is a flow chart of the test of charging the energy storage from the grid under grid-connected operation in Example 4.

[0128] Figure 4 This is a flow chart of the photovoltaic energy storage charging test in off-grid operation of Example 5.

[0129] Figure 5 This is a flow chart of the test of powering the RLC load with energy storage in off-grid operation in Example 6.

[0130] Figure 6 This is a flow chart of the grid-connected power quality test of Example 7.

[0131] Figure 7 This is a flow chart of the off-grid operation test of Example 8.

[0132] Figure 8 This is a flow chart of the island test in Example 9.

[0133] exist Figures 1 to 8 Including:

[0134] An AC simulated grid power source 100 , a battery simulator 200 , an IV simulator 300 , an RLC load 400 , a data acquisition device 500 , a computer 600 , and a device under test 700 . DETAILED DESCRIPTION

[0135] The technical solution of the present invention is further described in conjunction with the following embodiments.

[0136] Example 1.

[0137] A photovoltaic storage converter test system, such as Figure 1 As shown, an AC simulated grid power supply 100, a battery simulator 200, an IV simulator 300, an RLC load 400, a data acquisition device 500, a computer 600, a switch cabinet CB1 and a switch cabinet CB2 are provided.

[0138] The AC simulated grid power supply 100, the battery simulator 200, the IV simulator 300 and the RLC load 400 are connected to the device under test 700, the device under test 700, the battery simulator 200 and the IV simulator 300 are connected to the data acquisition device 500, the AC simulated grid power supply 100, the battery simulator 200, the IV simulator 300 and the RLC load 400 are connected to the computer 600, the switch cabinet CB1 is arranged between the AC simulated grid power supply 100 and the device under test 700, and the switch cabinet CB2 is arranged between the RLC load 400 and the device under test 700.

[0139] The AC simulated grid power supply 100 is used to simulate the grid and provide the AC side voltage, frequency, and bidirectional flow power to the device under test 700. The battery simulator 200 is used to simulate the charging performance and discharging performance of the battery. The IV simulator 300 is used to simulate the photovoltaic module. The data acquisition device 500 is used to collect voltage data and power data. The computer 600 is used to control the AC simulated grid power supply 100, the battery simulator 200, the IV simulator 300, the RLC load 400 and the data acquisition device 500, and issue instructions, receive the voltage data and power data collected by the data acquisition device 500, and then perform data processing to generate test results.

[0140] It should be noted that the battery simulator 200 of the present invention is a battery simulator 200 that can output and input current. The battery simulator 200 can simulate various battery characteristics, such as lithium batteries, lead-acid batteries, etc. The IV simulator 300 does not have a current input function, but only has a current output function. The IV simulator 300 is used to simulate various working conditions of photovoltaic modules. The current of the AC simulated grid power supply 100 can be output and input. The RLC load 400 of the present invention is used to simulate inductive, capacitive, and resistive loads in the grid.

[0141] Specifically, the first connection end of the device under test 700 is connected to a connection line, the connection line is connected to the first connection end of the AC simulated grid power supply 100, the connection line is connected to, the second connection end of the device under test 700 is connected to the first connection end of the battery simulator 200, and the third connection end of the device under test 700 is connected to the first connection end of the IV simulator 300. The first acquisition end of the data acquisition device 500 is connected to the connection line, the second acquisition end of the data acquisition device 500 is connected to the connection line between the second connection end of the device under test 700 and the first connection end of the battery simulator 200, and the third acquisition end of the data acquisition device 500 is connected to the connection line between the third connection end of the device under test 700 and the first connection end of the IV simulator 300. The first connection terminal of the computer 600 is connected to the second connection terminal of the RLC load 400 via an RS485 or 232 interface, the second connection terminal of the computer 600 is connected to the second connection terminal of the AC simulated grid power supply 100 via a BPIB interface, the third connection terminal of the computer 600 is connected to the second connection terminal of the IV simulator 300 via a BPIB interface, and the fourth connection terminal of the computer 600 is connected to the second connection terminal of the battery simulator 200 via a BPIB interface.

[0142] The switch cabinet CB1 of the present invention is arranged between the first connection end of the AC simulated grid power supply 100 and the connection line, and the switch cabinet CB2 is arranged between the first connection end of the AC simulated grid power supply 100 and the connection line.

[0143] The operation modes of the photovoltaic storage inverter test system of the present invention include photovoltaic power generation to the grid side and energy storage discharge grid side test mode under grid-connected operation, energy storage charging from the grid test mode under grid-connected operation, photovoltaic charging to energy storage test mode under off-grid operation, energy storage power supply to RLC load 400 test mode under off-grid operation, off-grid operation test mode, grid-connected operation power quality test mode and island test mode.

[0144] The power flow direction or current direction of the photovoltaic power generation to the grid side and the energy storage discharge grid side test mode under grid-connected operation is from the battery simulator 200 and the IV simulator 300 to the AC simulated grid power supply 100.

[0145] In the grid-connected operation, the power flow direction or current direction of the energy storage from the grid charging test mode is from the AC simulated grid power source 100 to the battery simulator 200.

[0146] The power flow direction or current direction of the photovoltaic energy storage charging test mode under off-grid operation is from the IV simulator 300 to the battery simulator 200.

[0147] In the off-grid operation, the power flow direction or current direction of the energy storage powering the RLC load 400 test mode is from the battery simulator 200 to the RLC load 400.

[0148] The power flow direction or current direction of the off-grid operation test mode is from the battery simulator 200 and the IV simulator 300 to the RLC load 400 .

[0149] The power flow direction or current direction of the grid-connected power quality test mode is from the battery simulator 200 and the IV simulator 300 to the AC simulated grid power source 100 .

[0150] The power flow direction or current direction of the island test mode is from the battery simulator 200 and the IV simulator 300 to the AC simulated grid power source 100 and the RLC load 400 .

[0151] It should be noted that the off-grid operation test mode of the present invention may also be referred to as a test of energy storage / photovoltaic power supply to a load.

[0152] The data acquisition device 500 of the present invention includes a power analyzer and an oscilloscope. The switch cabinets CB1 and CB2 are both remotely controlled to close or open by a computer 600. It should be noted that the opening and disconnection of the switch cabinets CB1 and CB2 of the present invention have the same meaning.

[0153] The model of the battery simulator 200 is IVS-S-2000-2000; the model of the IV simulator 300 is IVS-S-2000-2000; the model of the RLC load 400 is 38000H; the model of the switch cabinet CB1 is CB1; the model of the switch cabinet CB2 is CB2; the model of the power analyzer is WT5000; and the model of the oscilloscope recorder is DL850.

[0154] It should be noted that the photovoltaic storage converter test system of the present invention meets the requirements of GB / T 41240-2022 Household photovoltaic storage integrated machine test; NB / T 101861-2019 Technical specification for power conversion equipment for photovoltaic storage system; NB / T 32010-2013 Technical regulations for anti-islanding effect detection of photovoltaic power station inverter, and can perform standardized tests on photovoltaic storage integrated converters.

[0155] The photovoltaic storage type inverter test system can integrate resources without changing the test platform, thereby improving test efficiency, shortening test time, and reducing disconnection and wiring time. At the same time, the photovoltaic storage type inverter test system can automatically process the data collected by the acquisition device without human intervention, avoiding misjudgment and omission of test items. The photovoltaic storage type inverter test system can meet the grid-connected and off-grid tests of photovoltaic storage integrated inverters. The photovoltaic storage type inverter test system realizes fully automatic testing of efficiency and power quality by calculating and controlling all equipment, and can perform semi-automatic testing of island protection and other electrical performance tests.

[0156] Example 2.

[0157] A photovoltaic storage type converter testing method is implemented using the photovoltaic storage type converter testing system of Example 1.

[0158] The photovoltaic storage inverter test method includes photovoltaic power generation to the grid side and energy storage discharge grid side test under grid-connected operation, energy storage charging test from the grid under grid-connected operation, photovoltaic charging test for energy storage under off-grid operation, energy storage power supply test for RLC load 400 under off-grid operation, off-grid operation test, grid-connected operation power quality test and island test.

[0159] This photovoltaic storage type inverter test method can improve test efficiency, shorten test time, and reduce disconnection and wiring time. At the same time, the photovoltaic storage type inverter test system can automatically process the data collected by the acquisition device without human intervention, avoiding misjudgment and omission of test items. This photovoltaic storage type inverter test method can meet the grid-connected and off-grid tests of photovoltaic storage integrated inverters. This photovoltaic storage type inverter test method realizes fully automatic testing of efficiency and power quality by calculating and controlling all equipment, and can perform semi-automatic testing of island protection and other electrical performance tests.

[0160] Example 3.

[0161] A method for testing a photovoltaic storage converter, such as Figure 2 As shown, the photovoltaic storage converter test system of Example 1 is used for testing.

[0162] Among them, when conducting the test of photovoltaic power generation to the grid side and energy storage discharge to the grid side under grid-connected operation, the steps include:

[0163] Step a1, closing the switch cabinet CB1 and opening the switch cabinet CB2;

[0164] Step a2, initializing the DC power supply, setting the battery simulator 200 to CV mode, and setting the IV simulator 300 to IV mode;

[0165] Step a3, setting the voltage value, power value and phase of the AC simulated grid power supply 100;

[0166] Step a4, setting the voltage value and power value of the battery simulator 200, and setting the voltage value and power value of the IV simulator 300;

[0167] Step a5, starting the device under test 700;

[0168] Step a6, delay α;

[0169] Step a7, the data acquisition device 500 continuously collects data of duration β;

[0170] Step a8, determining whether the power collection of all power values ​​is completed under the current voltage value of the battery simulator 200 and the voltage value of the IV simulator 300, if not, returning to step a4, if yes, proceeding to step a9;

[0171] Step a9, determining whether all voltage value collection of the battery simulator 200 and the IV simulator 300 is completed, if not, returning to step a4, if yes, proceeding to step a10;

[0172] Step a10, generating a test report;

[0173] Step a11, end.

[0174] It should be noted that the CV mode of the present invention refers to the constant voltage mode, the IV mode refers to the current voltage curve mode, and the IV mode simulates the characteristics of the photovoltaic module. The CV mode of the present invention refers to the constant voltage mode. The start-up of the device under test 700 of the present invention is manual operation. The role of the delay α is to make the device under test 700 run stably.

[0175] It should be noted that each time in step a4, the voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 are defined as a voltage combination, and the same voltage combination has multiple corresponding power values, and in the photovoltaic power generation to the grid side and the energy storage discharge grid side test under grid-connected operation, multiple voltage combinations need to be measured. In a voltage combination, the voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 can be the same or different, which is specifically determined by the specifications of the device under test 700. Usually, the power value in a voltage combination includes 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, and the voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 in multiple voltage combinations correspond to the maximum value, the middle value and the minimum value, respectively.

[0176] The α of the present invention is 1 min to 3 min, and the β is 3 min. Specifically, the α of the present embodiment is 2 min.

[0177] The voltage of the AC simulated grid power supply 100 of the present invention is 0V~690V, the frequency is 40Hz~70Hz, the phase is 0°~360°, and the capacity is 5MVA; the voltage of the battery simulator 200 is 0V~2000V, and the capacity is 2MW; the voltage of the IV simulator 300 is 0V~2000V, and the capacity is 2MW. For example, when the ABC line voltage of the AC simulated grid power supply 100 is 400V, the frequency is 50H, the phase of A is 0°, the phase of B is 240°, and the phase of C is 120°. Then the voltage of the battery simulator 200 is set to 1500V accordingly, and the voltage of the battery simulator 200 is set to 1500V.

[0178] Example 4.

[0179] A method for testing a photovoltaic storage converter, such as Figure 3 As shown, the photovoltaic storage converter test system of Example 1 is used for testing.

[0180] When testing energy storage charging from the grid under grid-connected operation, the steps include:

[0181] Step b1, control the switch cabinet CB1 to close and the switch cabinet CB2 to open;

[0182] Step b2, setting the voltage value, power value and phase of the AC simulated grid power supply 100;

[0183] Step b3, initializing the DC power supply, setting the battery simulator 200 to CV mode, and setting the voltage value and power value of the battery simulator 200;

[0184] Step b4, starting the device under test 700;

[0185] Step b5, delay α;

[0186] Step b6, the data acquisition device 500 continuously collects data of duration β;

[0187] Step b7, determining whether the battery simulator 200 has completed power collection at all power points at the same voltage value, if not, returning to step b3, if yes, proceeding to step b8;

[0188] Step b8, determine whether the battery simulator 200 has completed all voltage value collection, if not, return to step b3, if yes, go to step b9;

[0189] Step b9, generating a test report;

[0190] Step b10, end.

[0191] The α of the present invention is 1 min to 3 min, and the β is 3 min. Specifically, the α of the present embodiment is 2 min.

[0192] The voltage of the AC simulated grid power supply 100 of the present invention is 0V~690V, the frequency is 40Hz~70Hz, the phase is 0°~360°, and the capacity is 5MVA; the voltage of the battery simulator 200 is 0V~2000V, and the capacity is 2MW; the voltage of the IV simulator 300 is 0V~2000V, and the capacity is 2MW. For example, when the ABC line voltage of the AC simulated grid power supply 100 is 400V, the frequency is 50H, the phase of A is 0°, the phase of B is 240°, and the phase of C is 120°. Then the voltage of the battery simulator 200 is set to 1500V accordingly, and the voltage of the battery simulator 200 is set to 1500V.

[0193] Example 5.

[0194] A method for testing a photovoltaic storage converter, such as Figure 4 As shown, the photovoltaic storage type converter test system of Example 1 is used. Wherein, when the photovoltaic energy storage charging test is performed under off-grid operation, the steps include:

[0195] Step c1, control the switch cabinet CB1 and the switch cabinet CB2 to be disconnected;

[0196] Step c2, initializing the DC power supply, setting the battery simulator 200 to CV mode, and setting the voltage value and power value of the battery simulator 200;

[0197] Step c3, setting the IV simulator 300 to IV mode;

[0198] Step c4, starting the device under test 700;

[0199] Step c5, delay α;

[0200] Step c6, the data acquisition device 500 continuously acquires data of duration β;

[0201] Step c7, determining whether the battery simulator 200 has completed power collection of all power points at the same voltage value, if not, returning to step c2, if yes, proceeding to step c8;

[0202] Step c8, determining whether the battery simulator 200 has completed all voltage value acquisitions, if not, returning to step c2, if yes, proceeding to step c9;

[0203] Step c9, generating a test report;

[0204] Step c10, end.

[0205] It should be noted that each time in step a4, a voltage value of the battery simulator 200 is set, and the voltage value has multiple corresponding power values, and the photovoltaic energy storage charging test under off-grid operation needs to measure multiple voltage values. Usually, the power value under a voltage includes 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, and the voltage value of the battery simulator 200 in multiple voltage combinations is the maximum value, the middle value and the minimum value.

[0206] Example 6.

[0207] A method for testing a photovoltaic storage converter, such as Figure 5 As shown, the test is performed using the photovoltaic storage type converter test system of Example 1. When performing the test of powering the RLC load 400 with energy storage in off-grid operation, the steps include:

[0208] Step d1, control the switch cabinet CB1 to be disconnected and the switch cabinet CB2 to be closed;

[0209] Step d2, initializing the DC power supply and setting the battery simulator 200 to CV mode;

[0210] Step d3, setting the device under test 700 to an off-grid mode, and setting the output voltage value and frequency value of the device under test 700;

[0211] Step d4, setting the voltage value of the battery simulator 200;

[0212] Step d5, setting the power value of the RLC load 400;

[0213] Step d6, delay α;

[0214] Step d7, the data acquisition device 500 continuously collects data of duration β;

[0215] Step d8, determining whether all power values ​​of the RLC load 400 at the same voltage value of the battery simulator 200 have been collected, if not, returning to step d5, if yes, proceeding to step d9;

[0216] Step d9, determine whether the battery simulator 200 has completed all voltage value collection, if not, return to step d4, if yes, go to step d10;

[0217] Step d10, generating a test report;

[0218] Step d11, end.

[0219] It should be noted that each time in step d4, a voltage value of the battery simulator 200 is set, and the voltage value has multiple corresponding power values, and multiple voltage values ​​need to be measured in the off-grid operation energy storage power supply test for the RLC load 400. Generally, the power values ​​under one voltage include 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, and the voltage values ​​of the battery simulator 200 in the multiple voltage combinations are the maximum value, the middle value and the minimum value.

[0220] Example 7.

[0221] A method for testing a photovoltaic storage converter, such as Figure 6 As shown, the photovoltaic storage converter test system of Example 1 is used for testing. When the grid-connected power quality test is performed, the steps include:

[0222] Step e1, control the switch cabinet CB1 to close and the switch cabinet CB2 to open;

[0223] Step e2, initializing the DC power supply, setting the battery simulator 200 to CV mode, and the IV simulator 300 to IV mode;

[0224] Step e3, setting the device under test 700 to the grid-connected mode, and setting the output voltage value and frequency value of the device under test 700;

[0225] Step e4, setting the voltage value and power value of the battery simulator 200, and setting the voltage value and power value of the IV simulator 300;

[0226] Step e5, starting the device under test 700;

[0227] Step e6, delay α; p

[0228] Step e7, the data acquisition device 500 continuously collects data of duration β;

[0229] Step e8, determining whether all power values ​​under the current voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 have been collected, if not, returning to step d5, if yes, proceeding to step e9;

[0230] Step e9, determine whether the battery simulator 200 and the IV simulator 300 have completed all voltage value acquisitions, if not, return to step e4, if yes, proceed to step e10;

[0231] Step e10, generating a test report;

[0232] Step e11, end.

[0233] The grid-connected power quality test is divided into at least one of a harmonic test, a DC component test, and a three-phase unbalance test.

[0234] The test steps of harmonic test, DC component test and three-phase unbalance test are the same as the above steps e1 to e11, and the harmonic test, DC component test and three-phase unbalance test can be tested at the same time, or one or more of them can be selected to be tested at the same time. The specific operation depends on the actual situation.

[0235] It should be noted that each time in step a4, the voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 are defined as a voltage combination, and the same voltage combination has multiple corresponding power values, and multiple voltage combinations need to be measured in the grid-connected power quality test. In a voltage combination, the voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 can be the same or different, which is determined by the specifications of the device under test 700. Usually, the power value in a voltage combination includes 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, and the voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 in multiple voltage combinations correspond to the maximum value, the middle value and the minimum value, respectively.

[0236] Example 8.

[0237] A method for testing a photovoltaic storage converter, such as Figure 7 As shown, the photovoltaic storage type converter test system of Example 1 is used for testing. When the off-grid operation test is performed, the steps include:

[0238] Step f1, control the switch cabinet CB1 to be disconnected and the switch cabinet CB2 to be closed;

[0239] Step f2, initializing the DC power supply, setting the battery simulator 200 to CV mode, and the IV simulator 300 to IV mode;

[0240] Step f3, setting the device under test 700 to an off-grid mode, and setting the output voltage value and frequency value of the device under test 700;

[0241] Step f4, setting the voltage value and power value of the battery simulator 200, and setting the voltage value and power value of the IV simulator 300;

[0242] Step f5, setting the power value of the RLC load 400;

[0243] Step f6, delay α;

[0244] Step f7, the data acquisition device 500 continuously acquires data of duration β;

[0245] Step f8, determining whether all power values ​​of the RLC load 400 at the current voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 have been collected, if not, returning to step f5, if yes, proceeding to step f9;

[0246] Step f9, determine whether the battery simulator 200 and the IV simulator 300 have completed all voltage value acquisitions, if not, return to step f4, if yes, proceed to step f10;

[0247] Step f10, generating a test report;

[0248] Step f11, end.

[0249] The off-grid operation test is divided into at least one of a voltage deviation test, a frequency deviation test, a voltage harmonic test or a dynamic voltage transient test.

[0250] The test steps of the voltage deviation test, frequency deviation test, voltage harmonic test or dynamic voltage transient test are the same as the above steps f1 to f11, and the voltage deviation test, frequency deviation test, voltage harmonic test or dynamic voltage transient test can be tested at the same time, or one or more of them can be selected to be tested at the same time. The specific operation depends on the actual situation.

[0251] It should be noted that each time in step a4, the voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 are defined as a voltage combination, and the same voltage combination has multiple corresponding power values, and in the off-grid operation test, multiple voltage combinations need to be measured. In a voltage combination, the voltage value of the battery simulator 200 and the voltage value of the IV simulator 300 can be the same or different, which is determined according to the specifications of the device under test 700. Generally, the power values ​​in a voltage combination include 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, and the voltage values ​​of the battery simulator 200 and the voltage values ​​of the IV simulator 300 in multiple voltage combinations correspond to the maximum value, the middle value and the minimum value, respectively.

[0252] Example 9.

[0253] A method for testing a photovoltaic storage converter, such as Figure 8 As shown, the photovoltaic storage converter test system of Example 1 is used for the test. When performing the island test, the steps include:

[0254] Step g1, initializing the DC power supply, setting the battery simulator 200 to CV mode, and the IV simulator 300 to IV mode;

[0255] Step g2, controlling the switch cabinet CB2 to close, initializing the AC simulated grid power supply 100, and setting the voltage value of the AC simulated grid power supply 100;

[0256] Step g3, control the switch cabinet CB1 to close, set the device under test 700 to the grid-connected mode, and set the output power value of the device under test 700;

[0257] Step g4, setting the power value of the RLC load 400;

[0258] Step g5, judging by observation whether the power value of the RLC load 400 meets the standard requirements, if it meets the standard requirements, proceeding to step g6, if it does not meet the standard requirements, returning to step g4;

[0259] Step g6, control the switch cabinet CB1 to open, and the wave recorder in the data acquisition device 500 records the waveform output by the device under test 700 and the opening signal of the switch cabinet CB1;

[0260] Step g7, determining the protection time of the device under test 700, when the protection time is greater than or equal to γ, proceeding to step g8, when the protection time is less than γ, returning to step g3;

[0261] Step g8, save data;

[0262] Step g9, determining whether all output power values ​​of the device under test 700 have been tested, if yes, proceeding to step g10, if no, returning to step g3;

[0263] Step g10, generating a test report;

[0264] Step g11, end.

[0265] The standard requirement is that when the protection time is less than γ, the standard requirement is met, and when the protection time is greater than or equal to γ, the standard requirement is not met. γ is 2s.

[0266] It should be noted that, each time in step g4, a power value of the RLC load 400 is set, and in the island test, multiple power values ​​need to be measured.

[0267] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A photovoltaic storage converter test system, characterized in that: It is equipped with AC simulated grid power supply, battery simulator, IV simulator, RLC load, data acquisition device, computer, switch cabinet CB1 and switch cabinet CB2. The AC simulated grid power supply, the battery simulator, the IV simulator and the RLC load are connected to the device under test, the device under test, the battery simulator and the IV simulator are connected to the data acquisition device, the AC simulated grid power supply, the battery simulator, the IV simulator and the RLC load are connected to the computer, the switch cabinet CB1 is arranged between the AC simulated grid power supply and the device under test, and the switch cabinet CB2 is arranged between the RLC load and the device under test; The AC simulated grid power supply is used to simulate the grid and provide the device under test with AC side voltage, frequency, and bidirectional flow power; The battery simulator is used to simulate the charging performance and discharging performance of the battery; The IV simulator is used to simulate a photovoltaic module; The data acquisition device is used to collect voltage data and power data; The computer is used to control the AC simulated grid power supply, the battery simulator, the IV simulator, the RLC load and the data acquisition device, and issue instructions, receive the voltage data and power data collected by the data acquisition device, and then perform data processing to generate test results; The first connection end of the device under test is connected to a connection line, the connection line is connected to the first connection end of the AC simulated grid power supply, the connection line is connected to the first connection end of the RLC load, the second connection end of the device under test is connected to the first connection end of the battery simulator, the third connection end of the device under test is connected to the first connection end of the IV simulator, The first acquisition end of the data acquisition device is connected to the connection line, the second acquisition end of the data acquisition device is connected to the connection line between the second connection end of the device under test and the first connection end of the battery simulator, and the third acquisition end of the data acquisition device is connected to the connection line between the third connection end of the device under test and the first connection end of the IV simulator; The first connection end of the computer is connected to the second connection end of the RLC load through an RS485 or 232 interface, the second connection end of the computer is connected to the second connection end of the AC simulated grid power supply through a BPIB interface, the third connection end of the computer is connected to the second connection end of the IV simulator through a BPIB interface, and the fourth connection end of the computer is connected to the second connection end of the battery simulator through a BPIB interface; The switch cabinet CB1 is arranged between the first connection end of the AC simulated grid power supply and the connection line, and the switch cabinet CB2 is arranged between the first connection end of the RLC load and the connection line; The operation modes include the test mode of photovoltaic power generation to the grid side and energy storage discharge to the grid side under grid-connected operation, the test mode of energy storage charging from the grid under grid-connected operation, the test mode of photovoltaic charging energy storage under off-grid operation, the test mode of energy storage supplying power to RLC load under off-grid operation, the off-grid operation test mode, the grid-connected power quality test mode and the island test mode; The power flow direction or current direction of the photovoltaic power generation to the grid side and the energy storage discharge grid side test mode under grid-connected operation is from the battery simulator and the IV simulator to the AC simulated grid power supply; The power flow direction or current direction of the energy storage from the grid charging test mode under grid-connected operation is from the AC simulated grid power supply to the battery simulator; The power flow direction or current direction of the photovoltaic energy storage charging test mode under off-grid operation is from the IV simulator to the battery simulator; The power flow direction or current direction of the test mode of energy storage supplying power to the RLC load under off-grid operation is from the battery simulator to the RLC load; The power flow direction or current direction of the off-grid operation test mode is from the battery simulator and the IV simulator to the RLC load; The power flow direction or current direction of the grid-connected power quality test mode is from the battery simulator and the IV simulator to the AC simulated grid power supply; The power flow direction or current direction of the island test mode is from the battery simulator and the IV simulator to the AC simulated grid power source and the RLC load.

2. The photovoltaic storage converter test system according to claim 1, characterized in that: The data acquisition device includes a power analyzer and a wave recorder; The switch cabinet CB1 and the switch cabinet CB2 are both remotely controlled to open or close by the computer; The model of the battery simulator is IVS-S-2000-2000; the model of the IV simulator is IVS-S-2000-2000; the model of the RLC load is 38000H; the model of the power analyzer is WT5000; and the model of the oscilloscope is DL850.

3. A method for testing a photovoltaic storage converter, characterized in that: The test is carried out using the photovoltaic storage inverter test system as described in claim 1 or 2, including photovoltaic power generation to the grid side and energy storage discharge grid side test under grid-connected operation, energy storage charging test from the grid under grid-connected operation, photovoltaic charging test for energy storage under off-grid operation, energy storage power supply test for RLC load under off-grid operation, off-grid operation test, grid-connected operation power quality test and island test; When conducting the test of photovoltaic power generation to the grid side and energy storage discharge to the grid side under grid-connected operation, the steps include: Step a1, closing the switch cabinet CB1 and opening the switch cabinet CB2; Step a2, initializing the DC power supply, setting the battery simulator to CV mode, and setting the IV simulator to IV mode; Step a3, setting the voltage value, power value and phase of the AC simulated power grid; Step a4, setting the voltage value and power value of the battery simulator, setting the voltage value and power value of the IV simulator; Step a5, starting the device under test; Step a6, delay α; Step a7, the data acquisition device continuously collects data of duration β; Step a8, determining whether the power collection of all power values ​​is completed under the current voltage value of the battery simulator and the voltage value of the IV simulator, if not, returning to step a4, if yes, proceeding to step a9; Step a9, determine whether all voltage value collection of the battery simulator and the IV simulator is completed, if not, return to step a4, if yes, go to step a10; Step a10, generating a test report; Step a11, end; When testing energy storage charging from the grid under grid-connected operation, the steps include: Step b1, control the switch cabinet CB1 to close and the switch cabinet CB2 to open; Step b2, setting the voltage value, power value and phase of the AC simulated power grid; Step b3, initialize the DC power supply, set the battery simulator to CV mode, and set the voltage value and power value of the battery simulator; Step b4, starting the device under test; Step b5, delay α; Step b6, the data acquisition device continuously collects data of duration β; Step b7, determine whether the battery simulator completes power collection of all power points at the same voltage value, if not, return to step b3, if yes, go to step b8; Step b8, determine whether the battery simulator has completed all voltage value collection, if not, return to step b3, if yes, go to step b9; Step b9, generating a test report; Step b10, end; When testing PV charging of energy storage in off-grid operation, the steps include: Step c1, control the switch cabinet CB1 and the switch cabinet CB2 to be disconnected; Step c2, initializing the DC power supply, setting the battery simulator to CV mode, and setting the voltage value and power value of the battery simulator; Step c3, setting the IV simulator to IV mode; Step c4, starting the device under test; Step c5, delay α; Step c6, the data acquisition device continuously acquires data of duration β; Step c7, judging whether the battery simulator has completed power collection of all power points at the same voltage value, if not, returning to step c2, if yes, entering step c8; Step c8, determine whether the battery simulator has completed all voltage value collection, if not, return to step c2, if yes, go to step c9; Step c9, generating a test report; Step c10, end; When testing the energy storage supplying power to the RLC load in off-grid operation, the steps include: Step d1, control the switch cabinet CB1 to be disconnected and the switch cabinet CB2 to be closed; Step d2, initializing the DC power supply and setting the battery simulator to CV mode; Step d3, setting the device under test to an off-grid mode, and setting the output voltage value and frequency value of the device under test; Step d4, setting the voltage value of the battery simulator; Step d5, setting the power value of the RLC load; Step d6, delay α; Step d7, the data acquisition device continuously collects data of duration β; Step d8, determining whether all power values ​​of the RLC load at the same voltage value of the battery simulator have been collected, if not, returning to step d5, if yes, proceeding to step d9; Step d9, determine whether the battery simulator has completed all voltage value collection, if not, return to step d4, if yes, go to step d10; Step d10, generating a test report; Step d11, end; When conducting grid-connected power quality testing, the steps include: Step e1, control the switch cabinet CB1 to close and the switch cabinet CB2 to open; Step e2, initializing the DC power supply, setting the battery simulator to CV mode, and the IV simulator to IV mode; Step e3, setting the device under test to a grid-connected mode, and setting the output voltage value and frequency value of the device under test; Step e4, setting the voltage value and power value of the battery simulator, setting the voltage value and power value of the IV simulator; Step e5, starting the device under test; Step e6, delay α; Step e7, the data acquisition device continuously collects data of duration β; Step e8, judging whether all power values ​​under the voltage value of the current battery simulator and the voltage value of the IV simulator have been collected, if not, returning to step d5, if yes, proceeding to step e9; Step e9, determine whether the battery simulator and IV simulator have completed all voltage value acquisitions, if not, return to step e4, if yes, proceed to step e10; Step e10, generating a test report; Step e11, end; When conducting off-grid operation tests, the steps include: Step f1, control the switch cabinet CB1 to be disconnected and the switch cabinet CB2 to be closed; Step f2, initializing the DC power supply, setting the battery simulator to CV mode, and the IV simulator to IV mode; Step f3, setting the device under test to an off-grid mode, and setting the output voltage value and frequency value of the device under test; Step f4, setting the voltage value and power value of the battery simulator, setting the voltage value and power value of the IV simulator; Step f5, setting the power value of the RLC load; Step f6, delay α; Step f7, the data acquisition device continuously acquires data of duration β; Step f8, judging whether all power values ​​of the RLC load at the current voltage value of the battery simulator and the voltage value of the IV simulator have been collected, if not, returning to step f5, if yes, entering step f9; Step f9, determine whether the battery simulator and IV simulator have completed all voltage value acquisitions, if not, return to step f4, if yes, go to step f10; Step f10, generating a test report; Step f11, end; When conducting an island test, the steps include: Step g1, initializing the DC power supply, setting the battery simulator to CV mode, and the IV simulator to IV mode; Step g2, control the switch cabinet CB2 to close, initialize the AC simulated grid power supply, and set the voltage value of the AC simulated grid power supply; Step g3, control the switch cabinet CB1 to close, set the device under test to the grid-connected mode, and set the output power value of the device under test; Step g4, setting the power value of the RLC load; Step g5, judging by observation whether the power value of the RLC load meets the standard requirements, if it meets the standard requirements, proceeding to step g6, if it does not meet the standard requirements, returning to step g4; Step g6, control the switch cabinet CB1 to open, and the wave recorder in the data acquisition device records the waveform output by the device under test and the opening signal of the switch cabinet CB1; Step g7, determine the protection time of the device under test, when the protection time is greater than or equal to γ, go to step g8, when the protection time is less than γ, return to step g3; Step g8, save data; Step g9, determining whether all output power values ​​of the device under test have been tested, if yes, proceeding to step g10, if no, returning to step g3; Step g10, generating a test report; Step g11, end.

4. The method for testing a photovoltaic storage converter according to claim 3 is characterized in that: The off-grid operation test is divided into at least one of a voltage deviation test, a frequency deviation test, a voltage harmonic test or a dynamic voltage transient test; The grid-connected power quality test includes at least one of a harmonic test, a DC component test, and a three-phase unbalance test; The standard requirement is that when the protection time is less than γ, the standard requirement is met, and when the protection time is greater than or equal to γ, the standard requirement is not met; The α is 1min to 3min; The β is 3min; The γ is 2s; The voltage of the AC simulated grid power supply is 0V to 690V, the frequency is 40 Hz to 70Hz, the phase is 0° to 360°, and the capacity is 5MVA; The battery simulator has a voltage of 0V to 2000V and a capacity of 2MW; The voltage of the IV simulator is 0V to 2000V, and the capacity is 2MW.

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