A low-voltage photovoltaic grid-connected device function test system and test method

Abstract

The application discloses a low-voltage photovoltaic grid-connected device function test system, comprising: a voltage output module for outputting alternating voltage, the amplitude, phase, frequency and harmonic of the output voltage of the voltage output module being adjustable; a grid-side voltage control module, the input end and the output end of which are connected with the output end of the voltage output module and the incoming line end of a device under test respectively; a power generation-side voltage control module, the input end and the output end of which are connected with the output end of the voltage output module and the outgoing line end of the device under test respectively; a current output module and a current isolation conversion module, the current output module being used for outputting alternating current and outputting current to the device under test through the current isolation conversion module, the incoming line end and the outgoing line end of the device under test being connected with two ends of the current isolation conversion module respectively; and a loop breaking module arranged in the loop of the device under test to control the on-off of the loop. The system can automatically test whether the device under test meets the low-voltage photovoltaic grid-connected device function requirements.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power distribution equipment, and particularly relates to a low-voltage photovoltaic grid-connected equipment function test system and a test method. BACKGROUND

[0002] A new power system mainly based on new energy is constructed, and the total capacity of new energy power generation such as low-voltage photovoltaic power generation is increased year by year, and the safety problem of the power grid brought thereby cannot be ignored.

[0003] On the one hand, due to the randomness, intermittence, volatility and tidal direction change of photovoltaic power generation, blind and disordered grid connection brings serious challenges to the safe and stable operation of the power grid. At present, the power distribution network mostly adopts three-section overcurrent protection, and after the low-voltage photovoltaic is connected, the size, duration and direction of the fault current of the power distribution network will change, which is easy to cause relay protection misoperation, thereby causing island phenomenon and damaging the equipment in the power grid. On the other hand, when the photovoltaic is connected to the grid, the current grid voltage and frequency and the photovoltaic power generation side voltage are required, and if the grid connection conditions are not met, the grid-connected equipment is easy to be damaged.

[0004] On the other hand, due to the uneven quality of photovoltaic power generation products, the number of manufacturers is large, and the assets of distributed photovoltaic power generation mostly belong to users, which brings great difficulty to the operation of photovoltaic power generation. Taking a photovoltaic grid-connected circuit breaker as an example, the photovoltaic grid-connected circuit breaker is a connection node of photovoltaic power generation and the power grid, and the protection logic directly affects the safe and stable operation of the power distribution network. However, at present, there is no effective verification method for the function of the photovoltaic grid-connected circuit breaker, and even some photovoltaic grid-connected circuit breakers are put into field use without detection, which brings hidden dangers to the photovoltaic grid connection safety.

[0005] In summary, in order to ensure the safe and reliable operation of low-voltage photovoltaic, the key function detection has high social value and economic value. Based on this, in the aspect of low-voltage photovoltaic grid connection, the application provides a low-voltage photovoltaic grid-connected equipment function test system, which can realize simulation of the photovoltaic grid connection process, effectively evaluate the island protection and power generation side grid management functions in the photovoltaic grid connection process, and achieve the goal of improving the reliability of grid connection operation. SUMMARY

[0006] To solve the above problems, the application aims to provide a low-voltage photovoltaic grid-connected equipment function test system, which can realize simulation of the photovoltaic grid connection process, effectively evaluate the island protection and power generation side grid management functions in the photovoltaic grid connection process, and achieve the goal of improving the reliability of grid connection operation.

[0007] In order to achieve the above object, the technical scheme of the present application is as follows: a low-voltage photovoltaic grid-connected device function test system, comprising: a voltage output module for outputting alternating voltage, the amplitude, phase, frequency and harmonic of the output voltage of the voltage output module being adjustable; a grid-side voltage control module, the input end and the output end of which are connected with the output end of the voltage output module and the incoming line end of a device under test respectively; a power generation-side voltage control module, the input end and the output end of which are connected with the output end of the voltage output module and the outgoing line end of the device under test respectively; a current output module and a current isolation conversion module, the current output module being used for outputting alternating current and outputting current to the device under test through the current isolation conversion module, the two ends of the current isolation conversion module being connected with the incoming line end and the outgoing line end of the device under test respectively; and further comprising a loop breaking module arranged in the loop of the device under test to control the on-off of the loop.

[0008] In a preferred embodiment of the present application, the voltage output module is a voltage power source, the adjustment range of the amplitude, phase, frequency and harmonic of the output voltage of the voltage power source being wider than the action response threshold of the device under test.

[0009] In a preferred embodiment of the present application, the grid-side voltage control module and the power generation-side voltage control module are single-knife switches.

[0010] In a preferred embodiment of the present application, the grid-side voltage control module and the power generation-side voltage control module each have a controlled end, the controlled end being connected with a processor of the test system and being controlled by a control signal sent by the processor to realize the on-off of the electrical connection with the incoming line end and / or the outgoing line end of the device under test.

[0011] In a preferred embodiment of the present application, the current output module is a current source, the adjustment range of the amplitude, phase, frequency and harmonic of the output current of the current source being wider than the action response threshold of the device under test.

[0012] In a preferred embodiment of the present application, the current isolation conversion module is an isolation type mutual inductor, the isolation type mutual inductor converting the current output by the current source into a target loop current to make the current in the loop of the device under test meet the target demand.

[0013] In a preferred embodiment of the present application, the loop breaking module is arranged in the loop of the device under test, one end of the loop breaking module being connected to the incoming line end of the device under test.

[0014] Based on the same concept, the application also provides a low-voltage photovoltaic grid-connected device function test method, comprising the following steps: controlling the amplitude, phase, frequency and harmonic of the voltage output by the voltage output module based on a time sequence according to a first preset program; controlling the amplitude, phase, frequency and harmonic of the current output by the current output module based on a time sequence according to a second preset program; controlling the on-off of the grid-side voltage control module and the power generation-side voltage control module respectively based on a time sequence according to a third preset program; and outputting that the to-be-tested device meets the low-voltage photovoltaic grid-connected device function test requirement in the case that the to-be-tested device makes a target action response.

[0015] Based on the same concept, the application also provides a computer device, comprising: a memory for storing a processing program; and a processor for executing the low-voltage photovoltaic grid-connected device function test method.

[0016] Based on the same concept, the application also provides a readable storage medium having a processing program stored thereon, the processing program being executed by a processor to implement the low-voltage photovoltaic grid-connected device function test method.

[0017] The application has the following advantages and positive effects compared with the prior art due to the adoption of the above technical solutions:

[0018] 1. The low-voltage photovoltaic grid-connected device function test system of the application is provided with a voltage output module capable of adjusting the amplitude, phase, frequency and harmonic of the voltage and a current output module capable of adjusting the amplitude, phase, frequency and harmonic of the current, so that the parameters of the voltage and current in the to-be-tested device circuit are adjusted to simulate various extreme conditions in a real operation scenario, thereby effectively testing the performance of the to-be-tested device and improving the safety of the to-be-tested device in real scenario application.

[0019] 2. The grid-side voltage control module and the power generation-side voltage control module of the application adopt controllable switches for controlling strong electricity with weak electricity, and further send control signals to the controlled ends of the controllable switches by combining the internal program of the processor of the test system to control the on-off of the grid-side voltage control module and the power generation-side voltage control module through the given program, thereby further improving the safety and convenience of the test system of the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings, in which:

[0021] Figure 1 It is a schematic diagram of the low-voltage photovoltaic grid-connected device function test system of the application;

[0022] Figure 2 It is a schematic diagram of one embodiment of the low-voltage photovoltaic grid-connected device function test system of the application. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] like Figure 1 As shown, a functional testing system for low-voltage photovoltaic grid-connected equipment includes: a voltage output module for outputting AC voltage, wherein the amplitude, phase, frequency, and harmonics of the output voltage are adjustable; a grid-side voltage control module, the input and output of which are respectively connected to the output of the voltage output module and the input terminal of the device under test; a generator-side voltage control module, the input and output of which are respectively connected to the output of the voltage output module and the output terminal of the device under test; a current output module and a current isolation conversion module, wherein the current output module outputs AC current and outputs current to the device under test through the current isolation conversion module, and the two ends of the current isolation conversion module are respectively connected to the input and output terminals of the device under test; and a loop disconnection module disposed in the circuit of the device under test to control the on / off state of the circuit.

[0026] The low-voltage photovoltaic grid-connected equipment functional testing system of the present invention is equipped with a voltage output module that can adjust the amplitude, phase, frequency and harmonics of the voltage, and a current output module that can adjust the amplitude, phase, frequency and harmonics of the current. By adjusting the voltage and current parameters in the circuit of the device under test, various extreme situations in real operating scenarios can be simulated, thereby effectively testing the performance of the device under test and improving the safety of the device under test in real-world applications.

[0027] The voltage output module, grid-side voltage control module, generator-side voltage control module, current output module, current isolation conversion module, and circuit disconnection module are coordinated and controlled to realize the changes in electrical quantities on both sides of the circuit breaker under test, simulate the generation of islanding phenomenon, and simulate the situation where the generator side is energized but closing is not allowed.

[0028] The voltage output module is used to output AC voltage to the grid-side voltage control module and the generator-side voltage control module. The output voltage can achieve a step change in a very short time to simulate the generation of islanding phenomenon.

[0029] In the embodiment, the step change of the voltage mainly includes that the voltage amplitude change within 100 ms exceeds the voltage swing amplitude setting value of the to-be-tested circuit breaker, the voltage phase change exceeds the voltage swing phase setting value of the to-be-tested circuit breaker, the voltage frequency change exceeds the voltage swing frequency setting value of the to-be-tested circuit breaker, and the voltage harmonic change exceeds the voltage swing harmonic setting value of the to-be-tested circuit breaker.

[0030] The grid-side voltage control module is used to control the AC voltage output by the voltage output module to be applied to the power supply side of the to-be-tested circuit breaker, so as to simulate the actual grid voltage; the power generation side voltage control module is used to control the AC voltage output by the voltage output module to be applied to the power generation side of the to-be-tested circuit breaker, so as to simulate the photovoltaic power generation side voltage; on this basis, the grid-side voltage and the power generation side voltage on both sides of the to-be-tested circuit breaker can be independently controlled. The current output module is used to output an AC current to the current isolation conversion module, and the output current can be flexibly adjusted in phase to simulate the power flow direction when the normal phenomenon and the island phenomenon occur. In the embodiment, the flexible adjustment of the output current phase is relative to the output voltage, that is, the output current phase is adjusted based on the voltage phase; see Figure 2 The current isolation conversion module is used to convert the 0-200 A current output by the current output module into a 0-2000 A current and realize the isolation from the output voltage. The loop breaking module is used to cut off the current loop output by the current isolation conversion module.

[0031] When the loop breaking module is in the non-breaking state, the incoming line and the outgoing line of the to-be-tested circuit breaker are directly connected, at this time, the grid-side voltage control module can be controlled to simulate the generation of the island phenomenon, and the anti-islanding function of the to-be-tested circuit breaker can be verified; wherein, the simulation of the generation of the island phenomenon mainly includes over / under voltage protection (the voltage amplitude swing within 100 ms exceeds the setting value of 0.1-0.9 Un), over / under frequency protection (the voltage frequency swing within 100 ms exceeds the setting value of 0.5-25 Hz), phase mutation (the voltage phase swing within 100 ms exceeds the setting value of 1-60°), harmonic mutation (the voltage waveform distortion rate swing within 100 ms exceeds the setting value of 0.5-30%) and the like.

[0032] In the embodiment, when the loop breaking module 7 is in the open state, the incoming line and the outgoing line of the to-be-tested circuit breaker are not connected, and the grid-side voltage control module 2 and the power generation side voltage control module 3 can realize the flexible control of the voltages on both sides of the to-be-tested circuit breaker; wherein, the flexible control of the voltages on both sides can control the grid-side voltage amplitude of the to-be-tested circuit breaker to be between AC 198 V and AC 236 V, the grid-side voltage frequency to be between 49.5 Hz and 50.5 Hz, and the power generation side to have no output voltage, so that the circuit breaker can be closed.

[0033] In a preferred embodiment of the present application, the voltage output module is a voltage power source, and the voltage power source has a wide range of adjustment in amplitude, phase, frequency and harmonic of the output voltage, which is wider than the action response threshold of the device under test.

[0034] In a preferred embodiment of the present application, the grid-side voltage control module and the power generation-side voltage control module are single-pole switches.

[0035] In a preferred embodiment of the present application, the grid-side voltage control module and the power generation-side voltage control module each have a controlled end connected to a processor of the test system and controlled by a control signal sent by the processor to realize the on-off connection with the incoming line end and / or the outgoing line end of the device under test.

[0036] The grid-side voltage control module and the power generation-side voltage control module of the present application use controllable switches to control strong current with weak current, and further send control signals to the controlled end of the controllable switch through the internal program of the processor of the test system, so as to control the on-off of the grid-side voltage control module and the power generation-side voltage control module through the given program, and further improve the safety and convenience of the test system of the present application.

[0037] In a preferred embodiment of the present application, the current output module is a current source, and the current source has a wide range of adjustment in amplitude, phase, frequency and harmonic of the output current, which is wider than the action response threshold of the device under test.

[0038] In a preferred embodiment of the present application, the current isolation conversion module is an isolation type transformer, which converts the current output by the current source into a target loop current so that the current in the loop of the device under test meets the target demand.

[0039] In a preferred embodiment of the present application, the loop breaking module is arranged in the loop of the device under test, and one end of the loop breaking module is connected to the incoming line end of the device under test.

[0040] Preferably, referring to Figure 2 , the voltage output module, i.e. the voltage power source, outputs alternating voltage, which is applied to the incoming and outgoing sides of the device under test through the grid-side voltage control module and the power generation-side voltage control module; the current output module, i.e. the A / B / C phase current source, outputs 0-200A current, which is converted into large current by the isolation type transformer, and the maximum current is 2000A, which is applied to the device under test.

[0041] The loop breaking module can cut off the current loop, so as to ensure that the lines on both sides of the device under test are not connected, and the grid-side voltage control module and the power generation-side voltage control module are combined to realize the flexible control of the voltage applied to both sides of the device under test.

[0042] Based on the same concept, the application also provides a low-voltage photovoltaic grid-connected device function test method, comprising the following steps:

[0043] S100: controlling the amplitude, phase, frequency and harmonic of the voltage output by the voltage output module according to a first preset program based on a time sequence;

[0044] S200: controlling the amplitude, phase, frequency and harmonic of the current output by the current output module according to a second preset program based on a time sequence;

[0045] S300: controlling the on-off of the grid-side voltage control module and the power generation-side voltage control module respectively according to a third preset program based on a time sequence;

[0046] S400: outputting that the to-be-tested device meets the low-voltage photovoltaic grid-connected device function test requirement in the case that the to-be-tested device makes a target action response.

[0047] The low-voltage photovoltaic grid-connected device function test system of the application is provided with the voltage output module capable of adjusting the amplitude, phase, frequency and harmonic of the voltage and the current output module capable of adjusting the amplitude, phase, frequency and harmonic of the current, the parameters of the voltage and current in the loop of the to-be-tested device are adjusted, various extreme conditions in the real operation scene are simulated, the performance of the to-be-tested device is effectively tested, and the safety of the to-be-tested device in the real scene application is improved.

[0048] Based on the same concept, the application also provides a computer device, comprising: a memory for storing a processing program; and a processor for executing the low-voltage photovoltaic grid-connected device function test method.

[0049] Based on the same concept, the application also provides a readable storage medium, the processing program is stored on the readable storage medium, and the processing program is executed by the processor to realize the low-voltage photovoltaic grid-connected device function test method.

[0050] Those skilled in the art can understand that all or part of the steps of the above method embodiments can be completed by program instruction related hardware, the foregoing program can be stored in a computer readable storage medium, and the program is executed to execute the steps of the above method embodiments; and the foregoing storage medium includes a mobile storage device, a read-only memory (ReadOnly Memory, ROM), a magnetic disc or an optical disc and various storage program codes.

[0051] The embodiments of the present application are explained in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments. Even if various changes are made to the present application, if the changes fall within the scope of the claims of the present application and equivalents thereof, they are still within the protective scope of the present application.

Claims

1. A low voltage photovoltaic grid-tie device functional test system, characterized by, The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system.

2. The low voltage photovoltaic grid-tie device functional test system of claim 1, wherein, The application relates to a low-voltage photovoltaic grid-connected equipment function test system.

3. The low voltage photovoltaic grid-tie device functional test system of claim 1, wherein, The application relates to a low-voltage photovoltaic grid-connected equipment function test system.

4. The low voltage photovoltaic grid-tie device functional test system of claim 3, wherein, The application relates to a low-voltage photovoltaic grid-connected equipment function test system.

5. The low voltage photovoltaic grid-tie device functional test system of claim 1, wherein, The application relates to a low-voltage photovoltaic grid-connected equipment function test system.

6. A method of functional testing of low voltage photovoltaic grid connected equipment, characterized in that, The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system.

7. A computer device, comprising: The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment function test system. The application relates to a low-voltage photovoltaic grid-connected equipment 8. A readable storage medium, characterized by, The readable storage medium stores a processing program, and the processing program is executed by the processor to realize the low-voltage photovoltaic grid-connected device function test method in claim 6.

Images