Converter hardware performance in-loop test system and test method

Abstract

A method for testing converter hardware performance in the loop and a converter hardware performance in the loop testing system using the method are provided. The converter hardware performance in the loop testing system comprises: an RTDS real-time simulation system for simulating different short-circuit ratios, voltage drops or rises, and parallel energy storage batteries; an interface conversion system for low-latency transmission between the RTDS real-time digital simulation system and a controller; and an energy storage converter controller that collects converter port information via the interface conversion device and controls the generation of trigger pulses to drive IGBT operation. The present invention constructs models of primary devices such as the AC system, converter, and DC system, and connects them to the controller of the energy storage converter via a weak current signal interface to form a semi-physical real-time simulation platform. This platform can test and verify the controller's low voltage ride-through, high voltage ride-through, and active and reactive power control functions.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic storage converters, and in particular to a converter hardware performance in-loop testing method and a converter hardware performance in-loop testing system using the method. Background Art

[0002] Energy storage converters are core components of energy storage power stations. Their grid-connected performance is closely linked to the safe and stable grid connection of the power station. While no relevant industry standards exist, the increasing emphasis on renewable energy and energy storage in recent years has led to a growing demand for these devices, and their widespread application. The testing requirements for energy storage converters have evolved significantly in recent years, with the development of converters focused on large single-unit capacity, modularity, high DC voltage input, and high AC voltage output. The power and voltage levels of type test hardware platforms are no longer sufficient for the evolving needs of energy storage converters. Therefore, hardware-in-the-loop (HIL) simulation testing of the electrical performance of energy storage converters has become an effective means of verifying the grid-connected performance and grid-source interaction of high-power converters. The accuracy of the test system hardware, model accuracy, and test methods all impact the accuracy of HIL simulation test results for energy storage converters.

[0003] Chinese invention patent application number 2019112676893, titled "Multi-source Switching Converter Test System," discloses a type test hardware platform. However, with technological advancements, the power and voltage levels of this type test hardware platform are no longer sufficient for the upgraded development of energy storage converters, such as MW-class energy storage converter type testing and cascaded energy storage converters.

[0004] Therefore, in view of the shortcomings of the existing technology, it is necessary to provide a converter hardware performance in-loop testing method and a converter hardware performance in-loop testing system to solve the shortcomings of the existing technology. Summary of the Invention

[0005] One of the objectives of the present invention is to overcome the shortcomings of the existing technology and provide a converter hardware performance in-the-loop testing system. This converter hardware performance in-the-loop testing system builds a model of primary equipment such as the AC system, converter, and DC system, which can meet the upgrade and development of energy storage converters.

[0006] The above-mentioned purpose of the present invention is achieved through the following technical measures:

[0007] Provided is a converter hardware performance in-loop test system, comprising:

[0008] RTDS real-time simulation system, used to simulate different short-circuit ratios, simulate voltage drops or rises, and simulate parallel energy storage batteries;

[0009] Interface conversion system, used for low-latency transmission between RTDS real-time digital simulation system and controller;

[0010] The energy storage converter controller collects converter port information through the interface conversion device and controls the generation of trigger pulses to drive the IGBT action.

[0011] Preferably, the interface conversion system communicates with the RTDS real-time simulation system via optical fiber, receives digital signals from the RTDS real-time simulation system, converts the digital signals into electrical signals, and collects the electrical signals for the energy storage converter controller.

[0012] Preferably, the power grid fault simulation generating device LVRT in the above RTDS real-time simulation system carries out a three-phase short circuit fault or a two-phase short circuit fault through inductance, and adopts the voltage division principle to realize the power grid voltage drop.

[0013] Preferably, the interface conversion system comprises a gigabit transceiver analog output card GTAO, a gigabit transceiver digital input card GTDI, a gigabit transceiver digital output card GTDO and a high-frequency power amplifier.

[0014] The converter hardware performance in-loop test system of the present invention has the following test method:

[0015] The steps include:

[0016] Step (1), simulation modeling;

[0017] Step (2), the interface conversion system performs I / O interface joint debugging;

[0018] Step (3), the RTDS real-time simulation system edits and stores the test items and the operation steps to be performed to form a prefabricated list;

[0019] Step (4), performing a working condition test;

[0020] Step (5): Analyze test results.

[0021] When the operating condition test is a low voltage ride-through test;

[0022] The step (3) includes:

[0023] Step (3.1a), start and run the RTDS real-time simulation system;

[0024] Step (3.2a), adjusting the output power of the energy storage converter;

[0025] Step (3.3a): Control the power grid fault simulation device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop or three-phase asymmetrical voltage drop.

[0026] Preferably, the above step (4) specifically controls the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system to be scaled and then output through a high-frequency digital simulation power amplifier.

[0027] Preferably, the above step (5) includes:

[0028] Step (5.1a), collecting the voltage and current output of the high-frequency digital simulation power amplifier through a data acquisition device, and recording the waveforms of the voltage and current of the energy storage converter under test;

[0029] Step (5.2a): Conduct data analysis and determine whether the low voltage ride-through test is qualified.

[0030] When the operating condition test is a high voltage ride-through test;

[0031] Preferably, the above step (3) includes:

[0032] Step (3.1b), start and run the RTDS real-time simulation system;

[0033] Step (3.2b), adjusting the output power of the energy storage converter;

[0034] Step (3.3b): Control the power grid fault simulation device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage raising.

[0035] Preferably, the above step (4) specifically controls the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system to be scaled and then output through a high-frequency digital simulation power amplifier.

[0036] Preferably, the above step (5) includes:

[0037] Step (5.1b): collect the voltage and current output of the high-frequency digital simulation power amplifier through a data acquisition device, and record the waveforms of the voltage and current of the energy storage converter under test;

[0038] Step (5.2b): Conduct data analysis and determine whether the high voltage ride-through test is qualified.

[0039] When the operating condition test is a weak grid adaptability test;

[0040] Preferably, the above step (1) specifically includes adjusting the system short-circuit capacity of the grid to which the energy storage converter is connected to be a preset value.

[0041] Preferably, the above step (3) includes:

[0042] Step (3.1c), the RTDS real-time simulation system starts running;

[0043] Step (3.2c), adjusting the output power of the energy storage converter;

[0044] Step (3.3c) is to carry out low voltage ride-through test and high voltage ride-through test respectively; when carrying out low voltage ride-through test, control the power grid fault simulation generating device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop or three-phase asymmetrical voltage drop; when carrying out high voltage ride-through test, control the power grid fault simulation generating device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop and increase.

[0045] Preferably, the above step (4) specifically controls the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system to be scaled and then output through a high-frequency digital simulation power amplifier.

[0046] Preferably, the above step (5) includes:

[0047] Step (5.1c): collect the voltage and current output of the high-frequency digital simulation power amplifier through a data acquisition device, and record the waveforms of the voltage and current of the energy storage converter under test;

[0048] Step (5.2c): When the low voltage ride-through test is carried out, data analysis is carried out to determine whether the low voltage ride-through test is qualified; when the high voltage ride-through test is carried out, data analysis is carried out to determine whether the high voltage ride-through test is qualified.

[0049] Preferably, the output power of the above energy storage converter is k×P n , P n is the rated power, and k is 0.1 to 0.3 or k = 0.9.

[0050] Preferably, the data acquisition device is a power analyzer and an oscilloscope recorder.

[0051] Preferably, the model of the power analyzer is WT5000, and the model of the oscilloscope recorder is DL850.

[0052] Another object of the present invention is to overcome the shortcomings of the prior art and provide a method for in-the-loop testing of converter hardware performance. The method can test and verify the low voltage ride-through, high voltage ride-through, and active and reactive power control of the controller.

[0053] The above-mentioned purpose of the present invention is achieved through the following technical measures:

[0054] Provided is a method for in-the-loop testing of converter hardware performance, which is performed using the above-mentioned converter hardware performance in-the-loop testing system.

[0055] The present invention provides a method for testing converter hardware performance in the loop and a converter hardware performance in the loop testing system using the method. The converter hardware performance in the loop testing system comprises: an RTDS real-time simulation system for simulating different short-circuit ratios, voltage drops or rises, and parallel energy storage batteries; an interface conversion system for low-latency transmission between the RTDS real-time digital simulation system and a controller; and an energy storage converter controller that collects converter port information via the interface conversion device and controls the generation of trigger pulses to drive IGBT operation. The present invention constructs models of primary devices such as the AC system, converter, and DC system, and connects them to the controller of the energy storage converter via a weak current signal interface to form a semi-physical real-time simulation platform. This platform can test and verify the controller's low voltage ride-through, high voltage ride-through, and active and reactive power control functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] 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.

[0057] Figure 1 Schematic diagram of a converter hardware performance in-loop test system.

[0058] Figure 2 The flowchart of a method for in-loop testing of converter hardware performance is shown in FIG.

[0059] Figure 3 This is the PCS primary system simulation modeling diagram of Example 2.

[0060] Figure 4 This is the simulation background monitoring interface of Example 2.

[0061] Figure 5 This is a test item automation case of Example 2.

[0062] Figure 6 The graph of line voltage and effective reactive current value in Example 2 is shown in FIG.

[0063] Figure 7 Example 2 is a graph showing the effective values ​​of the positive-sequence, negative-sequence, and zero-sequence components of the line voltage fundamental during a fault.

[0064] Figure 8 This is a curve diagram of the instantaneous value of the line voltage when a fault occurs in Example 2.

[0065] Figure 9 This is a curve diagram of the instantaneous value of the line voltage when the fault is restored in Example 2.

[0066] Figure 10 This is a curve diagram of the effective value of the phase current in Example 2.

[0067] Figure 11The graph of the effective values ​​of the positive-sequence, negative-sequence, and zero-sequence components of the current fundamental wave during a fault is shown in Example 2.

[0068] Figure 12 This is a curve diagram of the instantaneous value of the phase current when a fault occurs in Example 2.

[0069] Figure 13 This is a curve diagram of the instantaneous value of the phase current when the fault is restored in Example 2.

[0070] Figure 14 This is a curve diagram of the dynamic response of reactive current during a fault in Example 2.

[0071] Figure 15 The graph of the average values ​​of active power and reactive power in Example 2 is shown.

[0072] Figure 16 This is a graph of the positive-sequence and negative-sequence components of active power during a fault period in Example 2.

[0073] Figure 17 This is a graph of apparent power during a fault period in Example 2. DETAILED DESCRIPTION

[0074] The technical solution of the present invention is further described with reference to the following examples.

[0075] The measurement and control system of a power conversion system refers to the measurement and control system of the energy storage converter. The equipment under test (EUT) refers to the equipment being tested and, unless otherwise specified, includes all accessory equipment. Real-time digital simulation refers to digital simulation that proceeds at a speed consistent with the actual physical processes in the natural world. Multi-rate simulation refers to the decomposition of the simulation object into multiple subsystems, using different modeling methods, numerical calculation methods, and simulation step sizes for each subsystem, and achieving overall simulation through an interface. A real-time digital simulator (DRTS) is a general term for computing hardware and software capable of real-time digital simulation. A real-time simulation interface (RTSI) refers to the interface between the digital model and the actual physical device for input / output data exchange. Hardware-in-the-loop testing (HIL) is the process of connecting a real-time digital simulator and an actual physical model through a real-time simulation interface, forming a closed-loop system and allowing real-time interaction.

[0076] Example 1.

[0077] A converter hardware performance in-loop test system, such as Figure 1 As shown, the settings are:

[0078] RTDS real-time simulation system is used to simulate different short-circuit ratios, simulate voltage drops or rises, and simulate parallel energy storage batteries.

[0079] The interface conversion system is used for low-latency transmission between the RTDS real-time digital simulation system and the controller.

[0080] The energy storage converter controller collects converter port information through the interface conversion device, controls the generation of trigger pulses to drive the IGBT action, thereby achieving active power, reactive power and other control targets.

[0081] It should be noted that the trigger pulse driving the IGBT action is generated by a control strategy. The specific control strategy can be obtained through an internal algorithm set in the energy storage converter controller, and will not be described in detail here.

[0082] Among them, the interface conversion system communicates with the RTDS real-time simulation system through optical fiber, receives the digital signal of the RTDS real-time simulation system, and then converts the digital signal into an electrical signal, and the energy storage converter controller collects the electrical signal.

[0083] Among them, the power grid fault simulation device LVRT in the RTDS real-time simulation system uses inductance to carry out three-phase short circuit fault or two-phase short circuit fault, and adopts the voltage division principle to achieve power grid voltage drop.

[0084] The interface conversion system includes a gigabit transceiver analog output card GTAO, a gigabit transceiver digital input card GTDI, a gigabit transceiver digital output card GTDO and a high-frequency power amplifier.

[0085] exist Figure 1 In the RTDS real-time simulation system, Ls and Rs represent the source impedance. LVRT represents the inductor. Converters are primary devices and come in various types, such as two-level, three-level, and multi-level. Three-level converters have several different types. T1 is an isolation transformer, providing electrical isolation and reducing the short-circuit capacity of the power grid. T2 is a step-down transformer, converting high-voltage AC power to low-voltage AC power. QF12 is a grid-connected circuit breaker, connecting or disconnecting the electrical circuit. KM4 is a grid-connected circuit breaker, connecting or disconnecting the electrical circuit. PT1 is a grid-side voltage transformer, measuring voltage. PT2 is a valve-side voltage transformer, measuring voltage. C25, C26, and C27 are filter capacitors, filtering harmonics. R11 and L11 are damping resistors and inductors, preventing resonance. L1 is a filter inductor, filtering harmonics. C1 and C2 are DC-side capacitors, storing energy and smoothing voltage fluctuations. CT2 is the DC current transformer, used to measure DC current. Relay1 is the DC circuit breaker, used to open or close the DC electrical circuit.

[0086] In the RTDS real-time simulation system, the AC source simulates different short-circuit ratios by setting the power supply impedance. The LVRT simulates voltage drops through series-parallel inductors to complete low-voltage ride-through tests, while the LVRT simulates voltage rises through series-parallel inductors to complete high-voltage ride-through tests. The converter has a rated capacity of 630kW and a T-type three-level valve group topology, connected to the AC grid through an LC filter circuit. The DC side uses a DC source to simulate a parallel energy storage battery, and the DC capacitor is charged through a charging resistor before unlocking.

[0087] It should be noted that the various components in the RTDS real-time simulation system are digital simulation models of the AC power grid, DC power supply, low voltage ride-through simulation equipment, and primary equipment of the energy storage converter under test in the actual physical world. Their names and functions are consistent with the actual physical equipment.

[0088] It should be noted that the RTDS real-time simulation system, interface conversion system and energy storage converter controller of the present invention are all prior arts. The present invention proposes that the RTDS real-time simulation system, interface conversion system and energy storage converter controller are built together to form a converter hardware performance in-loop test system for subsequent converter hardware performance in-loop test method.

[0089] The converter hardware performance in-loop test system of the present invention is as follows: Figure 2 As shown, the test method is as follows:

[0090] The steps include:

[0091] Step (1), simulation modeling;

[0092] Step (2), the interface conversion system performs I / O interface joint debugging;

[0093] Step (3), the RTDS real-time simulation system edits and stores the test items and the operation steps to be performed to form a prefabricated list;

[0094] Step (4), performing a working condition test;

[0095] Step (5): Analyze test results.

[0096] When the operating test is a low voltage ride-through test;

[0097] Wherein step (3) comprises:

[0098] Step (3.1a), start and run the RTDS real-time simulation system;

[0099] Step (3.2a), adjusting the output power of the energy storage converter;

[0100] Step (3.3a): Control the power grid fault simulation device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop or three-phase asymmetrical voltage drop.

[0101] Step (4) specifically controls the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system, and then scales them and outputs them through a high-frequency digital simulation amplifier.

[0102] Wherein, step (5) includes:

[0103] Step (5.1a), collecting the voltage and current output of the high-frequency digital simulation power amplifier through a data acquisition device, and recording the waveforms of the voltage and current of the energy storage converter under test;

[0104] Step (5.2a): Conduct data analysis and determine whether the low voltage ride-through test is qualified.

[0105] When the operating condition test is a low voltage ride-through test, the simulation modeling specifically includes modeling of the AC grid primary system, modeling of the converter primary system, setting of the interface conversion system, and modeling of the low voltage ride-through fault simulation system.

[0106] When the operating test is a high voltage ride-through test;

[0107] Wherein, step (3) includes:

[0108] Step (3.1b), start and run the RTDS real-time simulation system;

[0109] Step (3.2b), adjusting the output power of the energy storage converter;

[0110] Step (3.3b): Control the power grid fault simulation device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage raising.

[0111] Among them, step (4) specifically controls the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system, and then scales them and outputs them through a high-frequency digital simulation amplifier.

[0112] Wherein, step (5) includes:

[0113] Step (5.1b): collect the voltage and current output of the high-frequency digital simulation power amplifier through a data acquisition device, and record the waveforms of the voltage and current of the energy storage converter under test;

[0114] Step (5.2b): Conduct data analysis and determine whether the high voltage ride-through test is qualified.

[0115] When the operating condition test is a high voltage ride-through test, the simulation modeling specifically includes modeling of the AC grid primary system, modeling of the converter primary system, setting of the interface conversion system, and modeling of the high voltage ride-through fault simulation system.

[0116] When the operating condition test is a weak grid adaptability test;

[0117] Wherein, step (1) specifically comprises adjusting the short-circuit capacity of the system connected to the grid of the energy storage converter to a preset value;

[0118] Step (3) includes:

[0119] Step (3.1c), the RTDS real-time simulation system starts running;

[0120] Step (3.2c), adjusting the output power of the energy storage converter;

[0121] Step (3.3c): perform low voltage ride-through test and high voltage ride-through test respectively; when performing low voltage ride-through test, control the power grid fault simulation device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop or three-phase asymmetrical voltage drop; when performing high voltage ride-through test, control the power grid fault simulation device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop and increase;

[0122] Among them, step (4) specifically controls the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system, and then scales them and outputs them through a high-frequency digital simulation amplifier.

[0123] Wherein, step (5) includes:

[0124] Step (5.1c): collect the voltage and current output of the high-frequency digital simulation power amplifier through a data acquisition device, and record the waveforms of the voltage and current of the energy storage converter under test;

[0125] Step (5.2c): When the low voltage ride-through test is carried out, data analysis is carried out to determine whether the low voltage ride-through test is qualified; when the high voltage ride-through test is carried out, data analysis is carried out to determine whether the high voltage ride-through test is qualified.

[0126] When the operating condition test is low voltage ride-through test, high voltage ride-through test or weak grid adaptability test, the output power of the energy storage converter is k×P n , P n is the rated power, and k is 0.1 to 0.3 or k = 0.9.

[0127] The data acquisition device of the present invention is a power analyzer and an oscilloscope recorder, wherein the model of the power analyzer is WT5000 and the model of the oscilloscope recorder is DL850.

[0128] It should be noted that the power grid fault simulation generating device LVRT of the present invention is operated specifically in accordance with the operating method described in the standard: GBT34133-2017 Technical Specifications for Detection of Energy Storage Converters / 5.3 Voltage Drop Generating Device.

[0129] For the grid fault simulation, the LVRT and step-down transformer T2 are digital models of actual physical devices.

[0130] The converter hardware performance in-loop test system has built primary equipment models such as the AC system, converter, and DC system, and is connected to the controller of the energy storage converter through a weak current signal interface to form a semi-physical real-time simulation platform. It can test and verify the low voltage ride-through, high voltage ride-through, and active and reactive power control functions of the controller.

[0131] Example 2

[0132] A method for in-the-loop testing of converter hardware performance is performed using the converter hardware performance in-the-loop testing system of Example 1.

[0133] This embodiment is described by taking a low voltage ride-through test as an example, wherein the device under test is a device under test from a certain manufacturer, and has a capacity of 1.25 MW.

[0134] The steps include:

[0135] Step (1), simulation modeling, as shown in the figure;

[0136] Step (2), the interface conversion system performs I / O interface joint debugging;

[0137] The step (3) includes:

[0138] Step (3.1a), start and run the RTDS real-time simulation system;

[0139] Step (3.2a), adjusting the output power of the energy storage converter;

[0140] Step (3.3a), controlling the power grid fault simulation generating device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop or three-phase asymmetrical voltage drop;

[0141] Step (4), controlling the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system to be scaled and then output through a high-frequency digital simulation power amplifier;

[0142] Step (5) includes:

[0143] Step (5.1a): collect the voltage and current output of the high-frequency digital simulation power amplifier through the data acquisition device, and record the waveforms of the voltage and current of the energy storage converter under test, such as Figure 6-17 As shown;

[0144] Step (5.2a): Analyze the data and determine whether the low voltage ride-through test is qualified, wherein the low voltage ride-through test is determined based on the test parameter indicators in Table 1;

[0145] Table 1. Test parameter indicators

[0146] Test indicators Measured calculated value Standard reference value Transient drop depth (%) 77.53 80±5 Steady-state drop depth (%) 80.00 / Fall start time (s) 18.23 / Fall end time(s) 20.12 / Drop duration tf (ms) 1895.00 ≥1894 Active power change rate during fault period (%Pn) 29.47 / Power recovery time tr(s) 0.043 / Average power recovery rate (%Pn / t) 738.54 ≥30 Reactive current response time tres (ms) 22.00 ≤30 Reactive current injection duration tlast (ms) 1869.00 / Reactive current injection effective value (A) 69.16 ≥58.64 Maximum reactive injection current (A) 74.86 / Reactive current adjustment time (ms) 23 /

[0147] The converter hardware performance in-loop test system can test and verify the low voltage ride-through of the controller.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A converter hardware performance in-loop test system, characterized in that: The settings are: RTDS real-time simulation system, used to simulate different short-circuit ratios, simulate voltage drops or rises, and simulate parallel energy storage batteries; Interface conversion system, used for low-latency transmission between RTDS real-time digital simulation system and controller; The energy storage converter controller collects converter port information through the interface conversion device and controls the generation of trigger pulses to drive the IGBT action; The test method is as follows: The steps include: Step (1), simulation modeling; Step (2), the interface conversion system performs I / O interface joint debugging; Step (3), the RTDS real-time simulation system edits and stores the test items and the operation steps to be performed to form a prefabricated list; Step (4), performing a working condition test; Step (5), test result analysis; When the operating condition test is a low voltage ride-through test; The step (3) includes: Step (3.1a), start and run the RTDS real-time simulation system; Step (3.2a), adjusting the output power of the energy storage converter; Step (3.3a), controlling the power grid fault simulation generating device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop or three-phase asymmetrical voltage drop; The step (4) specifically controls the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system to be scaled and then outputted through a high-frequency digital simulation power amplifier; The step (5) includes: Step (5.1a), collecting the voltage and current output of the high-frequency digital simulation power amplifier through a data acquisition device, and recording the waveforms of the voltage and current of the energy storage converter under test; Step (5.2a): Analyze the data and determine whether the low voltage ride-through test is qualified; The output power of the energy storage converter is k×P n , P n is the rated power, and k is 0.1 to 0.3 or k = 0.

9.

2. The converter hardware performance in-loop test system according to claim 1, characterized in that: The interface conversion system communicates with the RTDS real-time simulation system through optical fiber, receives digital signals from the RTDS real-time simulation system, converts the digital signals into electrical signals, and collects the electrical signals for the energy storage converter controller.

3. The converter hardware performance in-loop test system according to claim 2, characterized in that: The power grid fault simulation device LVRT in the RTDS real-time simulation system is to carry out a three-phase short circuit fault or a two-phase short circuit fault through inductance, and realize the power grid voltage drop by adopting the voltage division principle; The interface conversion system comprises a gigabit transceiver analog output card GTAO, a gigabit transceiver digital input card GTDI, a gigabit transceiver digital output card GTDO and a high-frequency power amplifier.

4. The converter hardware performance in-loop test system according to claim 3, characterized in that: When the operating condition test is a high voltage ride-through test; The step (3) includes: Step (3.1b), start and run the RTDS real-time simulation system; Step (3.2b), adjusting the output power of the energy storage converter; Step (3.3b), controlling the power grid fault simulation generating device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage raising; The step (4) specifically controls the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system to be scaled and then outputted through a high-frequency digital simulation power amplifier; The step (5) includes: Step (5.1b): collect the voltage and current output of the high-frequency digital simulation power amplifier through a data acquisition device, and record the waveforms of the voltage and current of the energy storage converter under test; Step (5.2b): Conduct data analysis and determine whether the high voltage ride-through test is qualified.

5. The converter hardware performance in-loop test system according to claim 3, characterized in that: When the operating condition test is a weak grid adaptability test; The step (1) specifically comprises adjusting the short-circuit capacity of the network to which the energy storage converter is connected to be a preset value; The step (3) includes: Step (3.1c), the RTDS real-time simulation system starts running; Step (3.2c), adjusting the output power of the energy storage converter; Step (3.3c): perform low voltage ride-through test and high voltage ride-through test respectively; when performing low voltage ride-through test, control the power grid fault simulation device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop or three-phase asymmetrical voltage drop; when performing high voltage ride-through test, control the power grid fault simulation device LVRT in the RTDS real-time simulation system to perform three-phase symmetrical voltage drop and increase; The step (4) specifically controls the voltage and current data on the high-voltage side of the step-down transformer T2 in the RTDS real-time simulation system to be scaled and then outputted through a high-frequency digital simulation power amplifier; The step (5) includes: Step (5.1c): collect the voltage and current output of the high-frequency digital simulation power amplifier through a data acquisition device, and record the waveforms of the voltage and current of the energy storage converter under test; Step (5.2c): When the low voltage ride-through test is carried out, data analysis is carried out to determine whether the low voltage ride-through test is qualified; when the high voltage ride-through test is carried out, data analysis is carried out to determine whether the high voltage ride-through test is qualified.

6. The converter hardware performance in-loop test system according to any one of claims 3 to 5, characterized in that: The data acquisition device is a power analyzer and an oscilloscope recorder; The model of the power analyzer is WT5000, and the model of the oscilloscope recorder is DL850.

7. A method for in-loop testing of converter hardware performance, characterized by: The method is carried out using the converter hardware performance in-the-loop test system as described in any one of claims 1 to 6.

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