Grid-connected adaptability detection system and method for charging and discharging equipment

Abstract

The invention provides a grid-connected adaptability detection system and method for charging and discharging equipment. The grid-connected adaptability detection system comprises an electric vehicle battery simulation device, a data acquisition device and a simulation power grid module, the electric vehicle battery simulation device, the data acquisition device and the simulation power grid module are all connected with to-be-tested charging and discharging equipment; the simulation power grid module is used for receiving a voltage frequency adjusting instruction and simulating a grid-connected adaptability detection working condition corresponding to the instruction according to the voltage frequency adjusting instruction, and then the data acquisition device is used for acquiring the voltage frequency of the electric vehicle battery simulation device when the electric vehicle battery simulation device is charged and discharged under the grid-connected adaptability detection working condition. Testing operation data of the charging and discharging equipment to be tested; by collecting the test operation data of the charging and discharging equipment when the charging and discharging equipment and the electric energy of the power grid flow bidirectionally, the grid-connected adaptability detection of the charging and discharging equipment is realized, the stability of the operation of the power grid is ensured, and the method plays an important role in the operation standardization of the charging and discharging equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of adaptability detection, and in particular relates to a charging and discharging equipment grid-connected adaptability detection system and method. Background Art

[0002] At present, with the rapid growth of electric vehicles, as a new type of adjustable load, the randomness and simultaneity of electric vehicle charging behavior have put forward new demands on the operation of the power grid, and the impact on the peak-valley balance of the power grid is becoming increasingly greater. Under uncontrolled conditions, a large number of electric vehicles are connected to the urban power grid for charging, which will increase the uncertainty risk of the urban power grid.

[0003] In order to enable electric vehicle clusters to store electricity during periods of surplus power generation in the grid and feed electricity back to the grid at appropriate times, it is necessary to vigorously develop vehicle to grid (Vehicle to Grid, V2G) interaction technology to support auxiliary services such as voltage and frequency regulation of urban power grids and improved power supply reliability. However, as the energy flow changes from one-way charging to two-way charging and discharging, the two-way interaction between vehicles and the grid has exposed problems such as the inability of electric vehicles to discharge electricity to the grid and increased uncertainty risks in the grid.

[0004] The detection system between electric vehicle charging and discharging piles, stations and power grids is imperfect, and it is impossible to verify the charging and discharging adaptability and safety of electric vehicle charging and discharging piles, stations and power grid systems, and it is impossible to promote the implementation of two-way interaction between piles, stations and networks. The large-scale access of electric vehicles may lead to increased fluctuations in the distribution network. When the power grid requires charging and discharging stations to respond to its control instructions, the failure of charging and discharging stations to respond accurately and promptly may cause stability problems to the power grid. Therefore, it is urgent to study the charging and discharging adaptability detection method between piles, stations and networks to ensure the intercommunication, safety and stability of charging and discharging of piles, stations and networks. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a charging and discharging equipment grid-connected adaptability detection system, comprising:

[0006] Electric vehicle battery simulator, data acquisition device and simulated power grid module;

[0007] The electric vehicle battery simulation device, the data acquisition device and the simulated power grid module are all connected to the charging and discharging equipment to be tested;

[0008] The simulated power grid module is used to receive voltage-frequency regulation instructions, and simulate the grid-connected adaptability detection conditions corresponding to the instructions according to the voltage-frequency regulation instructions, and then use the data acquisition device to collect the test operation data of the charging and discharging equipment to be tested when the electric vehicle battery simulation device is charged and discharged under the grid-connected adaptability detection conditions.

[0009] Preferably, the grid-connected adaptability detection conditions include one or more of the following: frequency adaptability detection conditions and voltage adaptability detection conditions; the voltage-frequency adjustment instructions include one or more of the following: frequency adjustment instructions, voltage adjustment instructions and output voltage adjustment instructions.

[0010] Preferably, the simulated power grid module comprises: a simulated power grid device and a first isolating switch;

[0011] The output end of the simulated power grid device is electrically connected to the AC end of the charging and discharging device to be tested through a first isolating switch;

[0012] The simulated power grid device is used to adjust the output frequency according to the received frequency adjustment instruction and simulate the corresponding frequency adaptability detection working condition.

[0013] Preferably, the simulated power grid module comprises: a simulated power grid device, a power grid fault simulation generating device and a switch module;

[0014] The switch module comprises: a first isolating switch and a second isolating switch;

[0015] The output end of the simulated power grid device is electrically connected to the AC end of the charging and discharging device to be tested through a first isolating switch;

[0016] The output end of the power grid fault simulation generating device is electrically connected to the AC end of the charging and discharging device to be tested through a second isolating switch;

[0017] The simulated power grid device is used to adjust the output voltage according to the received voltage adjustment instruction, combined with the power grid fault simulation device to adjust the output voltage according to the received output voltage adjustment instruction, thereby simulating the voltage adaptability detection working condition.

[0018] Preferably, the system further comprises: a transformer;

[0019] The low voltage side of the transformer is connected to the AC end of the charging and discharging device to be tested, and the high voltage side is connected to the output end of the simulated power grid module; the high voltage side is also connected to one end of the data acquisition device.

[0020] Preferably, the system further comprises: a third isolating switch, a fourth isolating switch and a power supply device;

[0021] The two ends of the third isolating switch are respectively connected to the electric vehicle battery simulation device and the charging and discharging device to be tested;

[0022] Both ends of the fourth isolating switch are connected to the simulated power grid module;

[0023] The output end of the power supply device is connected to the input end of the simulated power grid module.

[0024] Based on the same inventive concept, the present invention also provides a method for detecting the grid-connected adaptability of a charging and discharging device, comprising:

[0025] Utilize the simulated grid module to receive the voltage-frequency adjustment instruction, and simulate the grid-connected adaptability detection working condition corresponding to the instruction according to the voltage-frequency adjustment instruction, and then perform grid-connected adaptability detection on the charging and discharging equipment to be tested connected to the simulated grid module;

[0026] Using a data acquisition device, collecting test operation data of the charging and discharging device to be tested when charging and discharging the electric vehicle battery simulation device under grid-connected adaptability detection;

[0027] Determining whether the grid-connected adaptability test of the charging and discharging equipment to be tested has passed according to the test operation data;

[0028] Wherein, the simulated power grid module is the simulated power grid module in the charging and discharging equipment grid-connected adaptability detection system as described above.

[0029] Preferably, the grid-connected adaptability detection includes one or more of the following: frequency adaptability detection and voltage adaptability detection; the frequency adaptability detection includes one or more of the following: frequency rise test, frequency drop test, passive anti-island frequency limit protection action time test and frequency change rate test; the passive anti-island frequency limit protection action time test includes one or more of the following: frequency rise jump test and frequency drop jump test; the test operation data corresponding to the frequency adaptability detection includes one or more of the following: frequency operation status data, action frequency data and action frequency time data.

[0030] Preferably, the test operation data of the charging and discharging device to be tested is collected by using a data acquisition device when charging and discharging the electric vehicle battery simulation device under the frequency rise test, including:

[0031] Performing frequency increase regulation on the simulated power grid device in the simulated power grid module within a preset first frequency operation time range;

[0032] The data acquisition device is used to collect the test operation data of the charging and discharging equipment to be tested when the simulated power grid device charges and discharges the electric vehicle battery simulation device during the frequency increase regulation process.

[0033] Preferably, the test operation data of the charging and discharging device to be tested is collected by using a data acquisition device when charging and discharging the electric vehicle battery simulation device under the frequency reduction test, including:

[0034] Performing frequency reduction regulation on the simulated power grid device in the simulated power grid module within a preset second frequency operation time range;

[0035] The data acquisition device is used to collect the test operation data of the charging and discharging equipment to be tested when the simulated power grid device charges and discharges the electric vehicle battery simulation device during the frequency reduction regulation process.

[0036] Preferably, the voltage adaptability detection includes one or more of the following: voltage interference test and voltage ride-through test; the voltage interference test includes one or more of the following: undervoltage interference test, overvoltage interference test and voltage disturbance limit test; the voltage ride-through test includes one or more of the following: low voltage ride-through test and high voltage ride-through test; the test operation data corresponding to the voltage adaptability detection includes one or more of the following: voltage operation status data, action voltage data and action voltage time data.

[0037] Preferably, the test operation data of the charging and discharging device to be tested is collected by using a data acquisition device when charging and discharging the electric vehicle battery simulation device under voltage adaptability detection, including:

[0038] Obtaining the voltage level of the charging and discharging device to be tested connected to the distribution network;

[0039] When the charging and discharging device to be tested is connected to a first voltage level preset in the power distribution network, a voltage interference test is performed on the charging and discharging device to be tested, and the data acquisition device is used to collect test operation data of the charging and discharging device to be tested when the electric vehicle battery simulation device is charged and discharged during the voltage interference test;

[0040] When the charging and discharging equipment to be tested is connected to the second voltage level preset in the power distribution network, a voltage ride-through test is performed on the charging and discharging equipment to be tested, and the data acquisition device is used to collect test operation data of the charging and discharging equipment to be tested when the electric vehicle battery simulation device is charged and discharged during the voltage ride-through test.

[0041] Preferably, a low voltage ride-through test is performed on the charging and discharging device to be tested, and the data acquisition device is used to collect test operation data of the charging and discharging device to be tested when the electric vehicle battery simulation device is charged and discharged during the low voltage ride-through test, including:

[0042] Adjusting the power grid fault simulation generating device in the simulated power grid module to a low voltage ride through detection environment;

[0043] Based on the low voltage ride through detection environment, performing a first no-load test on the charging and discharging device to be tested, and obtaining whether the first no-load test result is qualified;

[0044] When the first no-load test result is qualified, based on the preset output power range of the charging device to be tested, the power grid fault simulation generating device is controlled to perform three-phase symmetrical voltage drop and three-phase asymmetrical voltage drop respectively;

[0045] The data acquisition device is used to respectively acquire the test operation data of the charging and discharging equipment to be tested when the electric vehicle battery simulation device is charged and discharged during the three-phase symmetrical drop and the three-phase asymmetrical drop.

[0046] Preferably, a high voltage ride-through test is performed on the charging and discharging device to be tested, and the data acquisition device is used to collect test operation data of the charging and discharging device to be tested when the electric vehicle battery simulation device is charged and discharged during the high voltage ride-through test, including:

[0047] Adjusting the power grid fault simulation generating device in the simulated power grid module to a high voltage ride through detection environment instruction;

[0048] Based on the high voltage ride through detection environment, performing a second no-load test on the charging and discharging device to be tested to obtain whether the second no-load test result is qualified;

[0049] When the second no-load test result is qualified, based on the preset input power range of the charging and discharging equipment to be tested, the power grid fault simulation generating device is controlled to perform three-phase symmetrical voltage raising;

[0050] The data acquisition device is used to collect test operation data of the charging and discharging equipment to be tested when the electric vehicle battery simulation device is charged and discharged during the three-phase symmetrical voltage raising process.

[0051] Compared with the closest prior art, the present invention has the following beneficial effects:

[0052] The present invention provides a charging and discharging equipment grid-connected adaptability detection system and method, comprising: an electric vehicle battery simulation device, a data acquisition device and a simulated power grid module; the electric vehicle battery simulation device, the data acquisition device and the simulated power grid module are all connected to the charging and discharging equipment to be tested; the simulated power grid module is used to receive a voltage-frequency adjustment instruction, and simulate the grid-connected adaptability detection working condition corresponding to the instruction according to the voltage-frequency adjustment instruction, and then use the data acquisition device to collect the test operation data of the charging and discharging equipment to be tested under the grid-connected adaptability detection working condition when the electric vehicle battery simulation device is charged and discharged; the present invention simulates different grid-connected adaptability detection working conditions, collects the test operation data of the charging and discharging equipment under the corresponding working conditions, realizes the grid-connected adaptability detection between the charging and discharging equipment and the power grid, makes the grid-connected adaptability detection system between the charging and discharging equipment and the power grid more perfect, and is conducive to ensuring that the charging and discharging equipment and the power grid can communicate, safely and stably charge and discharge, thereby promoting the implementation of two-way interaction between the charging and discharging equipment and the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of the structure of a charging and discharging equipment grid-connected adaptability detection system provided by the present invention;

[0054] Figure 2 A schematic diagram of the overall structure of a charging and discharging equipment grid-connected adaptability detection system provided by the present invention;

[0055] Figure 3 A schematic diagram of the overall architecture of a charging and discharging equipment grid-connected adaptability detection system provided by the present invention;

[0056] Figure 4 A schematic diagram of a flow chart of a method for detecting the grid-connected adaptability of a charging and discharging device provided by the present invention;

[0057] Figure 5 A schematic diagram of a frequency adaptability detection process in a method for detecting grid-connected adaptability of a charging and discharging device provided by the present invention;

[0058] Figure 6 A schematic diagram of a voltage adaptability detection process in a method for detecting grid-connected adaptability of a charging and discharging device provided by the present invention;

[0059] Figure 7 A schematic diagram of a low voltage ride-through curve in voltage adaptability detection in a method for detecting grid-connected adaptability of a charging and discharging device provided by the present invention;

[0060] Figure 8 A schematic diagram of a high voltage ride-through curve in voltage adaptability detection in a charging and discharging equipment grid-connected adaptability detection method provided by the present invention. DETAILED DESCRIPTION

[0061] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0062] Embodiment 1:

[0063] The present invention provides a charging and discharging equipment grid-connected adaptability detection system, the structural schematic diagram of which is as follows: Figure 1 As shown, including:

[0064] An electric vehicle battery simulation device 101, a data acquisition device 103 and a simulated power grid module 110;

[0065] The electric vehicle battery simulation device 101, the data acquisition device 103 and the simulated power grid module 110 are all connected to the charging and discharging device 102 to be tested;

[0066] The simulated power grid module 110 is used to receive a voltage-frequency regulation instruction, and simulate the grid-connected adaptability detection condition corresponding to the instruction according to the voltage-frequency regulation instruction, and then use the data acquisition device 103 to collect the test operation data of the charging and discharging device 102 to be tested when the electric vehicle battery simulation device 101 is charged and discharged under the grid-connected adaptability detection condition.

[0067] The grid-connected adaptability detection working conditions include one or more of the following: frequency adaptability detection working conditions and voltage adaptability detection working conditions; the voltage-frequency adjustment instructions include one or more of the following: frequency adjustment instructions, voltage adjustment instructions and output voltage adjustment instructions.

[0068] See also Figure 2 , the simulated power grid module 110 includes: a simulated power grid device 105 and a first isolating switch;

[0069] The output end of the simulated power grid device 105 is electrically connected to the AC end of the charge-discharge device to be tested 102 through a first isolating switch;

[0070] The simulated power grid device 105 is used to adjust the output frequency according to the received frequency adjustment instruction and simulate the corresponding frequency adaptability detection working condition.

[0071] The simulated power grid module 110 includes: a simulated power grid device 105, a power grid fault simulation device 106 and a switch module;

[0072] The switch module comprises: a first isolating switch and a second isolating switch;

[0073] The output end of the simulated power grid device 105 is electrically connected to the AC end of the charge-discharge device to be tested 102 through a first isolating switch;

[0074] The output end of the power grid fault simulation generating device 106 is electrically connected to the AC end of the charging and discharging device to be tested 102 through a second isolating switch;

[0075] The simulated power grid device 105 is used to adjust the output voltage according to the received voltage adjustment instruction, and is combined with the power grid fault simulation generating device 106 to adjust the output voltage according to the received output voltage adjustment instruction, thereby simulating the voltage adaptability detection working condition.

[0076] The system further includes: a transformer 104;

[0077] The low-voltage side of the transformer 104 is connected to the AC end of the charging and discharging device to be tested 102, and the high-voltage side is connected to the output end of the simulated power grid module 110; the high-voltage side is also connected to one end of the data acquisition device 103; preferably, the transformer is a multi-tap transformer; the multi-tap transformer can be located between the charging and discharging device to be tested 102 and the simulated power grid device 105; the high-voltage side of the multi-tap transformer has a variety of voltage levels, so that the detection system can match charging and discharging devices of different voltage levels for grid-connected adaptability detection, thereby increasing the capacity range and flexibility of the detection.

[0078] The system further includes: a third isolating switch, a fourth isolating switch and a power supply device 107;

[0079] The two ends of the third isolating switch are respectively connected to the electric vehicle battery simulation device 101 and the charging and discharging device to be tested 102;

[0080] Both ends of the fourth isolating switch are connected to the simulated power grid module 110;

[0081] The output end of the power supply device 107 is connected to the input end of the simulated power grid module 110 .

[0082] In this embodiment, the charging and discharging device 102 to be tested may include DC charging and discharging piles of different topological structures and a common AC bus charging and discharging station composed of DC charging and discharging piles. The type and capacity of the charging and discharging equipment can be changed according to the actual detection needs to meet the detection needs of the diversity of charging and discharging equipment. Specifically, the DC end of the charging and discharging device 102 to be tested is connected to the electric vehicle battery simulation device 101 through the third isolating switch Q3, and the AC end of the charging and discharging device 102 to be tested is connected to the first isolating switch Q1. The charging and discharging device 102 to be tested can realize the bidirectional conversion of AC and DC; the two ends of the simulated power grid device 105 form a loop through the fourth isolating switch Q4, and the fourth isolating switch Q4 is used to control the operation of the simulated power grid device 105. When the switch is closed, the simulated power grid device is short-circuited, and the simulated power grid device 105 is in a stopped state; when the switch is disconnected, the simulated power grid device 105 is in a working state, thereby realizing the role of the switch controlling the operation of the simulated power grid device 105, and the charging and discharging device 102 to be tested can be directly connected to the power grid for grid-connected adaptability detection.

[0083] Compared with the prior art, the two ends of the data acquisition device 103 of the embodiment of the present invention are respectively connected to the DC end and the AC end of the charging and discharging device 102 to be tested, and are used to collect the test operation data of the charging and discharging device 102 to be tested. By controlling different isolation switches and the start-up of the device, the test operation data of the charging and discharging device collected by the data acquisition device 103 will change, and the electric vehicle battery simulation device 101 and the charging and discharging device 102 and other devices can be adjusted according to different detection needs, so as to realize the detection system of different items of the grid-connected adaptability of the charging and discharging device 102, such as frequency adaptability detection, voltage adaptability detection, scheduling response time, charging response time detection, and discharge response time detection. At the same time, the electric vehicle battery simulation device 101 is selected to replace different types of electric vehicles to simplify the charging and discharging equipment detection system, and the charging and discharging detection, type and capacity can be changed according to actual detection needs to meet the detection needs of the diversity of charging and discharging equipment.

[0084] Embodiment 2:

[0085] A specific embodiment is used to illustrate a charging and discharging equipment grid-connected adaptability detection system proposed by the present invention. Figure 2As shown, it specifically includes: an electric vehicle battery simulation device 101, a charging and discharging device to be tested 102, a data acquisition device 103, a transformer 104, a simulated power grid device 105, a power grid fault simulation device 106, a switch Q1, a switch Q2, a switch Q3, a switch Q4, and a power supply device 107; the input end of the electric vehicle battery simulation device 101 is connected to the DC end of the charging and discharging device to be tested 102 through the switch Q3; the AC end of the charging and discharging device to be tested 102 is connected to the low-voltage side of the transformer 104 through a wire; the high-voltage side of the transformer 104 is connected to the output end of the simulated power grid device 105 through the switch Q1; the simulated The two ends of the power grid device 105 form a loop through the switch Q4; wherein the switch Q4 controls the operation of the simulated power grid device 105; or is connected to the output end of the power grid fault simulation generating device 106 through the switch Q2; the input end of the simulated power grid device 105 is connected to the power supply device 107 through a wire, and the input end of the power grid fault simulation device 106 is connected to the power supply device 107 through a wire; the two ends of the data acquisition device 103 are respectively connected to the DC end and the AC end of the charge-discharge device 102 to be tested, and the grid-connected adaptability detection of the charge-discharge device 102 to be tested is realized by collecting the test operation data of the charge-discharge device 102 to be tested.

[0086] Specifically, the electric vehicle battery simulation device 101 has high-precision and high-dynamic response characteristics, adopts full digital control, has high control accuracy, fast response speed, wide output adjustment range, and has the function of feeding back energy to the power grid; and the output has the characteristics of simulating a variety of electric vehicle batteries, and can set the battery charging and discharging characteristics under different numbers of car batteries and different battery capacities. In addition, the output of the electric vehicle battery simulation device 101 also has a programmable function, which can be used in a variety of occasions through different control software, and can simulate the output characteristics and battery charging and discharging of electric vehicles.

[0087] In this embodiment, the charging and discharging device 102 to be tested may include DC charging and discharging piles of different topological structures or a common AC bus charging and discharging station composed of DC charging and discharging piles. The type and capacity of the charging and discharging device 102 can be changed according to the actual detection needs to meet the detection needs of the diversity of charging and discharging piles and stations. Specifically, the DC end of the charging and discharging device 102 to be tested is connected to the electric vehicle battery simulation device 101 through the switch Q3, and the AC end of the charging and discharging device 102 to be tested is connected to the simulated power grid device 105 through the switch Q1. The charging and discharging device 102 to be tested can realize the bidirectional conversion between AC and DC; the simulated power grid device 105 provides various disturbances for the detection system, including voltage fluctuations, voltage swells, harmonic disturbances and three-phase imbalance, etc., to simulate various states that may occur in the power grid. The voltage value of each phase can be independently adjusted and programmed, the frequency value can be adjusted and programmed, and the electric energy can flow in both directions; the two ends of the simulated power grid device 105 form a loop through the switch Q4, wherein the switch Q4 controls the operation of the simulated power grid device 105, when the switch Q4 is closed, the simulated power grid device 105 is short-circuited and is in a stopped state, when the switch Q4 is disconnected, the simulated power grid device 105 is in a working state, thereby realizing the role of switch Q4 in controlling the operation of the simulated power grid device 105, and the charging and discharging piles and stations to be tested can be directly connected to the power grid for relevant detection.

[0088] The AC end of the charging and discharging device 102 to be tested is also connected to a power grid fault simulation generating device 106 through a switch Q2, and the power grid fault simulation generating device 106 includes a low voltage fault generating device and a high voltage fault generating device, which respectively simulate the low voltage ride-through detection environment and the high voltage ride-through detection environment, and can realize the high and low voltage ride-through combined test. Among them, the low voltage fault generating device uses a passive inductor to simulate the power grid voltage drop, and can simulate a three-phase symmetrical voltage drop, a phase-to-phase voltage drop, and a single-phase voltage drop; the high voltage fault generating device adopts a passive device, which is composed of a current limiting inductor, a boost capacitor, a damping resistor, and a circuit breaker, and can simulate a three-phase symmetrical voltage rise.

[0089] In addition, the detection system also includes a multi-tap transformer; the multi-tap transformer can be located between the charging and discharging equipment to be tested 102 and the simulated power grid device 105; the high-voltage side of the multi-tap transformer has a variety of voltage levels, so that the detection system can match charging and discharging equipment of different voltage levels for grid-connected adaptability detection, thereby increasing the capacity range and flexibility of the detection.

[0090] Specifically, the two ends of the data acquisition device 103 are respectively connected to the DC end and the AC end of the charging and discharging equipment 102, and are used to collect the test operation data of the charging and discharging equipment 102 under the grid-connected adaptability detection; the data acquisition device 103 includes a voltage transformer, a current transformer, a power analyzer, a power quality analyzer, a recorder, etc., which collects the test operation data of the DC end and the AC end of the charging and discharging equipment 102 for the test project data, and finally performs a systematic data analysis and unified processing, and at the same time issues a test report in a preset format.

[0091] This embodiment controls the start-up of different switches and devices so that the test operation data of the charging and discharging device 102 collected by the data collection device 103 will change. The user can adjust the electric vehicle battery simulation device 101 and the charging and discharging device 102 and other devices according to different detection needs, so as to realize the detection of different items of grid-connected adaptability of the electric vehicle charging and discharging device by the detection system, such as frequency adaptability detection, voltage adaptability detection, scheduling response time, charging response time detection, discharge response time detection, etc. At the same time, the present invention uses the electric vehicle battery simulation device 101 to replace different types of electric vehicles, simplifies the charging and discharging equipment grid-connected adaptability detection system, and the charging and discharging detection, type and capacity can be changed according to actual detection needs, which is conducive to meeting the detection needs of the diversity of charging and discharging piles and stations.

[0092] Through the above process, the construction of the grid-connected adaptability detection system for charging and discharging equipment can be realized, such as Figure 3 As shown, after the detection system is constructed, the frequency adaptability detection and voltage adaptability detection of the charging and discharging device 102 to be tested can be performed by utilizing the grid-connected adaptability detection system.

[0093] Embodiment 3:

[0094] Based on the same inventive concept, the present invention also provides a method for detecting the grid-connected adaptability of charging and discharging equipment, the flow chart of which is as follows: Figure 4 As shown, including:

[0095] Step 1: using the simulated grid module 110 to receive a voltage-frequency adjustment instruction, and simulating a grid-connected adaptability detection working condition corresponding to the instruction according to the voltage-frequency adjustment instruction, and then performing a grid-connected adaptability detection on the charging and discharging device 102 to be tested connected to the simulated grid module 110;

[0096] Step 2: using the data acquisition device 103 to collect the test operation data of the charging and discharging device 102 to be tested when the electric vehicle battery simulation device 101 is charged and discharged under the grid-connected adaptability test;

[0097] Step 3: Determine whether the grid-connected adaptability test of the charging and discharging device 102 to be tested has passed according to the test operation data;

[0098] Wherein, the simulated power grid module is the simulated power grid module in the charging and discharging equipment grid-connected adaptability detection system as described above.

[0099] The grid-connected adaptability detection includes one or more of the following: frequency adaptability detection and voltage adaptability detection; the frequency adaptability detection includes one or more of the following: frequency rise test, frequency drop test, passive anti-islanding frequency limiting protection action time test and frequency change rate test; the passive anti-islanding frequency limiting protection action time test includes one or more of the following: frequency rise jump test and frequency drop jump test; the test operation data corresponding to the frequency adaptability detection includes one or more of the following: frequency operation status data, action frequency data and action frequency time data.

[0100] Before performing a grid-connected adaptability test on the charging and discharging device 102 to be tested connected to the simulated grid module 110, a self-test of the grid-connected adaptability test system is required, which specifically includes:

[0101] Set the charging and discharging equipment to operate in the charging state; connect the charging and discharging equipment to the simulated power grid device 105, and close the first isolating switch Q1; adjust the output frequency of the simulated power grid device 105 within the range of 49.52Hz to 50.18Hz, reasonably select several points within the range, and operate each point continuously to determine whether the current detection system operation status is normal. If the current detection system operation status is normal, enter the formal grid-connected adaptability detection link. If the current detection system operation status is abnormal, check the status of the current detection system and repair it. After the repair, re-enter the grid-connected adaptability detection link; set the charging and discharging equipment to operate in the discharging state, and repeat the above self-test steps; when the detection system is self-tested, it is displayed that the detection system is operating normally Only when the charging and discharging equipment to be tested is tested can the grid-connected adaptability test be carried out. When the operating status is abnormal, the grid-connected adaptability test cannot be carried out; wherein, the normal operating status refers to the voltage and current waveforms of the charging and discharging equipment 102 detected by the detection system are normal, which meet the factory voltage, current and power values ​​of the charging and discharging equipment 102; the abnormal operating status refers to the measured voltage and current waveforms are incorrect, which do not meet the factory voltage, current and power values ​​of the charging and discharging equipment 102; general operating abnormalities will occur in the connection problem between the system and the charging and discharging pile. Recheck the wiring. If there is no problem with the wiring, check whether the instrument used in the data acquisition device is an instrument failure, and repair the corresponding ones together. The self-test of the detection system should be carried out in both charging and discharging states.

[0102] The data acquisition device is used to collect the test operation data of the charging and discharging device to be tested when charging and discharging the electric vehicle battery simulation device under the frequency rise test, including:

[0103] Performing frequency increase regulation on the simulated power grid device 105 in the simulated power grid module 110 within a preset first frequency operation time range;

[0104] Using the data acquisition device 103, the test operation data of the charging and discharging device to be tested 102 is collected when the simulated power grid device 105 charges and discharges the electric vehicle battery simulation device 101 during the frequency increase regulation process;

[0105] Preferably, the first frequency operation time range is 5s, and the frequency increase adjustment range of the simulated power grid device 105 is 50Hz to 50.48Hz, that is, during the frequency increase test, the frequency change of the simulated power grid device changes from 50Hz to 50.48Hz. Each corresponding frequency state change runs continuously for at least 5s, and each state is repeated. Finally, the test operation data of the charging and discharging equipment 102 during the frequency increase test is collected through the data acquisition device 103.

[0106] The data acquisition device is used to collect the test operation data of the charging and discharging device to be tested when charging and discharging the electric vehicle battery simulation device under the frequency reduction test, including:

[0107] Performing frequency reduction regulation on the simulated power grid device 105 in the simulated power grid module 110 within a preset second frequency operation time range;

[0108] Using the data acquisition device 103, the test operation data of the charging and discharging device to be tested 102 is collected when the simulated power grid device 105 charges and discharges the electric vehicle battery simulation device 101 during the frequency reduction adjustment process;

[0109] Preferably, the second frequency operation time range is 5s, and the frequency reduction adjustment range of the simulated power grid device 105 is 50Hz to 48.02Hz, that is, in the frequency reduction test, the frequency change of the simulated power grid device is adjusted to change from four frequency states of 50Hz to 48.02Hz, each corresponding frequency state runs continuously for at least 5s, and each state is repeated, and finally the test operation data of the charging and discharging equipment during the frequency reduction test is collected by the data acquisition device 103.

[0110] When conducting the passive anti-islanding frequency limit protection action time test, adjust the frequency state change of the simulated power grid device 105, and the response of the inverter during charging and discharging must be consistent; in the frequency change rate test, adjust the simulated power grid device 105 to perform f-P response tests with different frequency change rates; record the test operation data of the charging and discharging equipment and analyze the recorded data, and output the corresponding test report.

[0111] The voltage adaptability detection includes one or more of the following: voltage interference test and voltage ride-through test; the voltage interference test includes one or more of the following: undervoltage interference test, overvoltage interference test and voltage disturbance limit test; the voltage ride-through test includes one or more of the following: low voltage ride-through test and high voltage ride-through test; the corresponding test operation data during the voltage adaptability detection includes one or more of the following: voltage operation status data, action voltage data and action voltage time data.

[0112] When performing voltage adaptability detection on the charging and discharging equipment, it is also necessary to perform self-check on the detection system, specifically including: setting the charging and discharging equipment to operate in the charging and discharging state; connecting the charging and discharging equipment 102 to the simulated power grid device 105, and closing the corresponding switch Q1; adjusting the output of the simulated power grid device 105 to be within the range of 86% to 109% of the nominal voltage of the access power grid, reasonably selecting several points within the range, and running each point continuously to determine whether the current operating state of the detection system is normal. If the current operating state of the detection system is normal, enter the voltage adaptability detection link. If the current operating state of the detection system is abnormal, check the current state of the detection system and repair it. After repair, re-enter the voltage adaptability detection link;

[0113] The data acquisition device 103 is used to collect the test operation data of the charging and discharging device to be tested when charging and discharging the electric vehicle battery simulation device under voltage adaptability detection, including:

[0114] Obtaining the voltage level of the charging and discharging device 102 to be tested connected to the distribution network;

[0115] When the charging and discharging device 102 to be tested is connected to the first voltage level preset in the distribution network, a voltage interference test is performed on the charging and discharging device 102 to be tested, and the data acquisition device 103 is used to collect the test operation data of the charging and discharging device 102 to be tested when the electric vehicle battery simulation device 101 is charged and discharged during the voltage interference test; preferably, the charging and discharging device connected to 220 / 380V and the charging and discharging device connected to the distribution network with a voltage level of 6kV to 10 (20) kV and above is tested with U<85%U N Undervoltage interference, U>110U N Overvoltage interference, and the voltage disturbance duration of the charging and discharging equipment is greater than 0.2s;

[0116] When the charging and discharging device 102 to be tested is connected to the second voltage level preset in the power distribution network, a voltage ride-through test is performed on the charging and discharging device 102 to be tested, and the data acquisition device 103 is used to collect the test operation data of the charging and discharging device 102 to be tested when the electric vehicle battery simulation device 101 is charged and discharged during the voltage ride-through test; preferably, the voltage disturbance limit test for the charging and discharging device connected to the voltage level of 220 / 380V, 6kV~10(20)kV and above includes: setting the voltage of the simulated power grid device from U N Down to 90% U N , U N Up to 110% U N The above, and each voltage change is required to last for more than 2s; respectively use the test operation data of the charging and discharging device 102 collected by the data collection device 103, analyze the recorded data, and output the corresponding voltage adaptability detection report.

[0117] A low voltage ride-through test is performed on the charging and discharging device to be tested, and the data acquisition device is used to collect test operation data of the charging and discharging device to be tested when the electric vehicle battery simulation device is charged and discharged during the low voltage ride-through test, including:

[0118] Adjusting the power grid fault simulation generating device 106 in the simulated power grid module 110 to a low voltage ride through detection environment;

[0119] Based on the low voltage ride through detection environment, a first no-load test is performed on the charging and discharging device to be tested 102 to obtain whether the first no-load test result is qualified;

[0120] When the first no-load test result is qualified, based on the preset output power range of the charging device to be tested, the power grid fault simulation generating device 106 is controlled to perform three-phase symmetrical voltage drop and three-phase asymmetrical voltage drop respectively;

[0121] The data acquisition device 103 is used to collect test operation data of the charging and discharging device 102 to be tested when the electric vehicle battery simulation device 101 is charged and discharged during the three-phase symmetrical drop and the three-phase asymmetrical drop. Preferably, the detection method for low voltage ride-through of the charging and discharging device connected to a voltage level of 10(6) kV or above includes the following steps:

[0122] Set the charging and discharging device 102 to operate in the discharging state; connect the charging and discharging device 102 to the simulated power grid device 105, and close the first isolating switch Q1; adjust the output voltage of the power grid fault simulation device 106, select the drop point, and determine whether the current detection system is operating normally. If the current detection system is operating normally, enter the test. If the current detection system is operating abnormally, check the current detection system and repair it. After repair, re-enter the test; when performing a no-load test, adjust the power grid fault simulation device 106 to simulate the voltage drop, record the no-load test results, and perform a low voltage ride-through load test if the results are qualified, and close Q1 that is disconnected in the no-load test; adjust the output power of the charging and discharging device 102 to 0.1P N ~0.9P N Control the power grid fault simulation generating device 106 to perform three-phase symmetrical voltage drop and asymmetrical voltage drop; record the waveforms of the voltage and current of the charging and discharging equipment grid connection point, and record the data between 10s before the voltage drop and 6s after the voltage returns to normal; analyze the recorded test operation data and output the corresponding detection report.

[0123] A high voltage ride-through test is performed on the charging and discharging device to be tested, and the data acquisition device is used to collect test operation data of the charging and discharging device to be tested when the electric vehicle battery simulation device is charged and discharged during the high voltage ride-through test, including:

[0124] Adjusting the power grid fault simulation generating device 106 in the simulated power grid module 110 to a high voltage ride through detection environment instruction;

[0125] Based on the high voltage ride through detection environment, performing a second no-load test on the charging and discharging device to be tested 102 to obtain whether the second no-load test result is qualified;

[0126] When the second no-load test result is qualified, based on the preset input power range of the charging and discharging equipment to be tested, the power grid fault simulation generating device 106 is controlled to perform three-phase symmetrical voltage raising;

[0127] The data acquisition device 103 is used to collect the test operation data of the charging and discharging device 102 to be tested when the electric vehicle battery simulation device 101 is charged and discharged during the three-phase symmetrical voltage rise process; preferably, the detection method for high voltage ride-through of the charging and discharging device connected to a voltage level of 10(6) kV or above includes the following steps:

[0128] Set the charging and discharging device 102 to operate in the discharging state; connect the charging and discharging device 102 to the simulated power grid device 105, and close the corresponding first isolating switch Q1; adjust the output voltage of the power grid fault simulation device 106, select 2 drop points, and determine whether the current detection system is operating normally. If the current detection system is operating normally, enter the test; if the current detection system is operating abnormally, check the current detection system and repair it. After repair, re-enter the test; perform a no-load test, adjust the power grid fault simulation device, simulate the three-phase voltage rise of the line, and record the voltage curve of the charging and discharging device grid connection point; determine that the no-load test results meet the requirements and meet the requirements for high voltage ride-through load test; adjust the input power of the charging and discharging device 102 at 0.1P N ~0.9P N control the grid fault simulation generating device 106 to perform a three-phase symmetrical voltage raise; record the voltage and current waveforms of the charging and discharging equipment and the grid connection point, and record the data between 10s before the voltage drop and 6s after the voltage returns to normal; analyze the recorded test operation data and output the corresponding detection report.

[0129] Embodiment 4:

[0130] A method for detecting the grid-connected adaptability of a charging and discharging device proposed by the present invention is described with a specific embodiment. Figure 5 As shown, specifically including:

[0131] a) setting the charging and discharging device 102 to operate in a charging state;

[0132] b) connecting the charging and discharging device 102 to the simulated power grid device 105, and closing switches Q1 and Q2;

[0133] c) Adjust the output voltage of the simulated power grid device 105 to the nominal voltage of the power grid to be connected Within the range, several points (at least 4 points, and the critical points must be measured) are reasonably selected within the range, and each point is continuously operated for at least 1 minute to determine whether the current detection system is running correctly. If the current detection system is running normally, enter step e. If the current detection system is running abnormally, disconnect switch Q2 and switch Q1, check the current detection system and repair it, and re-enter step a after repair;

[0134] d) setting the charging and discharging device 102 to operate in a discharging state, and repeating step c;

[0135] e) Perform the following undervoltage and overvoltage test steps on the connected 220 / 380V charging and discharging device 102:

[0136] (i) The charging and discharging device 102 is subjected to 75% U NThe undervoltage disturbance of the charging and discharging device 102 lasts for

[0137] Must be greater than 2s;

[0138] (ii) The charging and discharging device 102 is subjected to 40% U N The undervoltage disturbance of the charging and discharging device 102 lasts for

[0139] Must be greater than 0.2s;

[0140] (iii) The charging and discharging device 102 is subjected to 115% U N Overvoltage disturbance, the voltage disturbance of the charging and discharging device 102 lasts

[0141] The time should be greater than 2s;

[0142] (iiii) The charging and discharging device 102 is subjected to 125% U N Overvoltage interference requires the immediate disconnection time to be less than 0.2s;

[0143] f) For charging and discharging equipment connected to the distribution network of 6kV to 10(20)kV and above voltage level, the following test steps shall be performed:

[0144] (1) Connecting a transformer and adjusting the voltage at the connection side between the transformer 104 and the simulated power grid device 105 to a corresponding voltage level;

[0145] (2) The charging and discharging device 102 is subjected to 115% U N (110U N <U) overvoltage disturbance, the voltage disturbance duration of the charging and discharging device 102 must be greater than 2s;

[0146] (3) The charging and discharging device 102 is subjected to 125% U N (120%U N <U) overvoltage interference;

[0147] g) Conduct voltage disturbance limit test on charging and discharging equipment 102 connected to 220 / 380V, 6kV~10(20)kV and above voltage levels:

[0148] Set the simulated grid device 105 voltage from U N Down to 85% U N Below, U N Down to 90% U N , U N Up to 110% U N Above, and each voltage change is required to last for more than 2s;

[0149] h) recording the test operation data of the charging and discharging device 102 respectively;

[0150] i) Analyze the recorded data and output the corresponding test report.

[0151] The charging and discharging equipment 102 is connected to a voltage level of 10(6)kV or above, and low voltage ride-through detection is performed, such as Figure 6 As shown, the following steps are included:

[0152] A) setting the charging and discharging device 102 to operate in a discharging state;

[0153] B) connecting the charging and discharging device 102 to the simulated power grid device 105, and closing switches Q1 and Q3;

[0154] C) Adjust the output voltage of the power grid fault simulation generating device 106, select 5 drop points, and N ≤U≤5%U N , 20% U N ≤U≤25%U N , 25% U N <U≤50% U N 50% U N <U≤75% U N , 75% U N <U≤90% U N There are distributions in five intervals, and according to Figure 7 Select the drop time. Determine whether the current detection system is running correctly. If the current detection system is running normally, go to step D. If the current detection system is running abnormally, disconnect switch Q3 and switch Q1, check the current detection system and repair it. After repair, re-enter step A.

[0155] D) Perform a no-load test and disconnect switch Q1;

[0156] E) Adjust the power grid fault simulation generating device 106 to simulate a symmetrical line fault. The voltage drop point is selected according to the requirements of step C;

[0157] F) Adjust the grid fault simulation device 106 to simulate AB, BC, CA phase short circuit or ground short circuit fault, and the voltage drop point is based on Figure 7 Select the requirements and record the voltage curve of the grid connection point of the charging and discharging device 102;

[0158] G) Determine whether the no-load test result meets the requirements. If so, proceed to step H. If not, make adjustments and repeat E)-F);

[0159] H) Perform low voltage ride through load test and close Q1 which is disconnected in no-load test;

[0160] I) Adjust the output power of the charging and discharging device 102 to 0.1PN ~0.9P N between;

[0161] J) controlling the power grid fault simulation generating device 106 to perform three-phase symmetrical voltage drop and asymmetrical voltage drop;

[0162] K) Adjust the output power of the charging and discharging equipment to the rated power P N , repeat j);

[0163] L) respectively recording the waveforms of the voltage and current at the grid connection point of the charging and discharging device 102, and recording the test operation data from 10 seconds before the voltage drops to 6 seconds after the voltage returns to normal;

[0164] M) Analyze the recorded data and output the corresponding test report.

[0165] The charging and discharging device 102 is connected to a voltage level of 10(6) kV or above and high voltage ride-through detection is performed, including the following steps:

[0166] 1) setting the charging and discharging device 102 to operate in a discharging state;

[0167] 2) connecting the charging and discharging device 102 to the simulated power grid device 105, and closing switches Q1 and Q3;

[0168] 3) Adjust the output voltage of the power grid fault simulation device 106, select two drop points, and N ≤U≤120%U N , 120% U N ≤U≤130%U N There are distributions in both intervals and according to Figure 8 The medium and high voltage ride-through curve requires the selection of the lifting time. Determine whether the current detection system is operating correctly. If the current detection system is operating normally, proceed to step 4. If the current detection system is operating abnormally, disconnect switches Q3 and Q1, check the current detection system and repair it. After repair, re-enter step 1.

[0169] 4) Perform a no-load test and disconnect switch Q1;

[0170] 5) adjusting the grid fault simulation generating device 106, simulating the three-phase voltage rise of the line, selecting the voltage rise point according to the requirements of step 3, and recording the voltage curve of the grid connection point of the charging and discharging device 102;

[0171] 6) Determine whether the no-load test result meets the requirements. If so, proceed to step 7. If not, make adjustments and repeat step 5.

[0172] 7) Perform a high voltage ride through load test and close Q1 which was disconnected in the no-load test;

[0173] 8) Adjust the input power of the charging and discharging device 102 to 0.1P N ~0.9P N between;

[0174] 9) controlling the power grid fault simulation generating device 106 to raise the three-phase symmetrical voltage;

[0175] 10) Adjust the input power of the charging and discharging device 102 to the rated power P N , repeat step nine;

[0176] XI) Record the voltage and current waveforms at the grid connection point of the charging and discharging device 102, and record the test operation data from 10 seconds before the voltage drops to 6 seconds after the voltage returns to normal;

[0177] 12) Analyze the recorded data and output the corresponding test report.

[0178] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0179] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0180] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0181] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A charging and discharging equipment grid-connected adaptability detection system, characterized in that: include: An electric vehicle battery simulation device (101), a data acquisition device (103) and a simulated power grid module (110); The electric vehicle battery simulation device (101), the data acquisition device (103) and the simulated power grid module (110) are all connected to the charging and discharging device to be tested (102); The simulated power grid module (110) is used to receive a voltage-frequency adjustment instruction and simulate a grid-connected adaptability detection operating condition corresponding to the instruction according to the voltage-frequency adjustment instruction, and then use the data acquisition device (103) to acquire test operation data of the charge-discharge device (102) to be tested when the electric vehicle battery simulation device (101) is charged and discharged under the grid-connected adaptability detection operating condition.

2. The system according to claim 1, characterized in that The grid-connected adaptability detection working conditions include one or more of the following: frequency adaptability detection working conditions and voltage adaptability detection working conditions; the voltage-frequency adjustment instructions include one or more of the following: frequency adjustment instructions, voltage adjustment instructions and output voltage adjustment instructions.

3. The system according to claim 2, characterized in that The simulated power grid module (110) comprises: a simulated power grid device (105) and a first isolating switch; The output end of the simulated power grid device (105) is electrically connected to the AC end of the charging and discharging device (102) to be tested via a first isolating switch; The simulated power grid device (105) is used to adjust the output frequency according to the received frequency adjustment instruction, and simulate the corresponding frequency adaptability detection working condition.

4. The system according to claim 2, characterized in that The simulated power grid module (110) comprises: a simulated power grid device (105), a power grid fault simulation generating device (106) and a switch module; The switch module comprises: a first isolating switch and a second isolating switch; The output end of the simulated power grid device (105) is electrically connected to the AC end of the charging and discharging device (102) to be tested via a first isolating switch; The output end of the power grid fault simulation generating device (106) is electrically connected to the AC end of the charging and discharging device (102) to be tested via a second isolating switch; The simulated power grid device (105) is used to adjust the output voltage according to the received voltage adjustment instruction, and is combined with the power grid fault simulation generation device (106) to adjust the output voltage according to the received output voltage adjustment instruction, thereby simulating the voltage adaptability detection working condition.

5. The system according to claim 1, wherein: The system further comprises: a transformer (104); The low-voltage side of the transformer (104) is connected to the AC end of the charging and discharging device (102) to be tested, and the high-voltage side is connected to the output end of the simulated power grid module (110); the high-voltage side is also connected to one end of the data acquisition device (103).

6. The system according to claim 1, wherein: The system further comprises: a third isolating switch, a fourth isolating switch and a power supply device (107); Two ends of the third isolating switch are respectively connected to the electric vehicle battery simulation device (101) and the charging and discharging device to be tested (102); Two ends of the fourth isolating switch are connected to a simulated power grid module (110); The output end of the power supply device (107) is connected to the input end of the simulated power grid module (110).

7. A method for detecting the grid-connected adaptability of charging and discharging equipment, characterized in that: include: Using a simulated grid module (110) to receive a voltage-frequency adjustment instruction, and simulating a grid-connected adaptability detection working condition corresponding to the instruction according to the voltage-frequency adjustment instruction, thereby performing a grid-connected adaptability detection on a charging and discharging device (102) to be tested that is connected to the simulated grid module (110); Using a data acquisition device (103), collecting test operation data of the charging and discharging device (102) to be tested when charging and discharging the electric vehicle battery simulation device (101) under grid-connected adaptability detection; Determining whether the grid-connection adaptability test of the charging and discharging device (102) to be tested has passed according to the test operation data; Wherein, the simulated grid module is a simulated grid module in a charging and discharging equipment grid-connected adaptability detection system as described in any one of claims 1 to 6.

8. The method according to claim 7, characterized in that The grid-connected adaptability detection includes one or more of the following: frequency adaptability detection and voltage adaptability detection; the frequency adaptability detection includes one or more of the following: frequency rise test, frequency drop test, passive anti-islanding frequency limiting protection action time test and frequency change rate test; the passive anti-islanding frequency limiting protection action time test includes one or more of the following: frequency rise jump test and frequency drop jump test; the test operation data corresponding to the frequency adaptability detection includes one or more of the following: frequency operation status data, action frequency data and action frequency time data.

9. The method according to claim 8, characterized in that The data acquisition device is used to collect the test operation data of the charging and discharging device to be tested when charging and discharging the electric vehicle battery simulation device under the frequency rise test, including: Performing frequency increase regulation on the simulated power grid device (105) in the simulated power grid module (110) within a preset first frequency operation time range; The data acquisition device (103) is used to collect test operation data of the charging and discharging device (102) to be tested when the simulated power grid device (105) charges and discharges the electric vehicle battery simulation device (101) during the frequency increase regulation process.

10. The method according to claim 8, characterized in that The data acquisition device is used to collect the test operation data of the charging and discharging device to be tested when charging and discharging the electric vehicle battery simulation device under the frequency reduction test, including: Performing frequency reduction regulation on the simulated power grid device (105) in the simulated power grid module (110) within a preset second frequency operation time range; The data acquisition device (103) is used to collect test operation data of the charging and discharging device (102) to be tested when the simulated power grid device (105) charges and discharges the electric vehicle battery simulation device (101) during the frequency reduction regulation process.

11. The method according to claim 8, characterized in that The voltage adaptability detection includes one or more of the following: voltage interference test and voltage ride-through test; the voltage interference test includes one or more of the following: undervoltage interference test, overvoltage interference test and voltage disturbance limit test; the voltage ride-through test includes one or more of the following: low voltage ride-through test and high voltage ride-through test; the corresponding test operation data during the voltage adaptability detection includes one or more of the following: voltage operation status data, action voltage data and action voltage time data.

12. The method according to claim 11, characterized in that The data acquisition device is used to collect the test operation data of the charging and discharging device to be tested when charging and discharging the electric vehicle battery simulation device under voltage adaptability detection, including: Obtaining the voltage level of the charging and discharging device (102) to be tested connected to the distribution network; When the charging and discharging device (102) to be tested is connected to a first voltage level preset in the power distribution network, a voltage interference test is performed on the charging and discharging device (102) to be tested, and the data acquisition device (103) is used to collect test operation data of the charging and discharging device (102) to be tested when the electric vehicle battery simulation device (101) is charged and discharged during the voltage interference test; When the charging and discharging device (102) to be tested is connected to a second voltage level preset in the power distribution network, a voltage ride-through test is performed on the charging and discharging device (102) to be tested, and the data acquisition device (103) is used to acquire test operation data of the charging and discharging device (102) to be tested when the electric vehicle battery simulation device (101) is charged and discharged during the voltage ride-through test.

13. The method according to claim 12, characterized in that A low voltage ride-through test is performed on the charging and discharging device to be tested, and the data acquisition device is used to collect test operation data of the charging and discharging device to be tested when the electric vehicle battery simulation device is charged and discharged during the low voltage ride-through test, including: Adjusting the power grid fault simulation generating device (106) in the simulated power grid module (110) to a low voltage ride-through detection environment; Based on the low voltage ride-through detection environment, a first no-load test is performed on the charging and discharging device to be tested (102), and whether the first no-load test result is qualified; When the first no-load test result is qualified, based on a preset output power range of the charging device to be tested, the power grid fault simulation generating device (106) is controlled to perform three-phase symmetrical voltage drop and three-phase asymmetrical voltage drop respectively; The data acquisition device (103) is used to respectively acquire test operation data of the charge-discharge device (102) to be tested when the electric vehicle battery simulation device (101) is charged and discharged during a three-phase symmetrical drop and a three-phase asymmetrical drop.

14. The method according to claim 12, characterized in that A high voltage ride-through test is performed on the charging and discharging device to be tested, and the data acquisition device is used to collect test operation data of the charging and discharging device to be tested when the electric vehicle battery simulation device is charged and discharged during the high voltage ride-through test, including: adjusting the power grid fault simulation generating device (106) in the simulated power grid module (110) to a high voltage ride-through detection environment instruction; Based on the high voltage ride through detection environment, performing a second no-load test on the charging and discharging device to be tested (102), and obtaining whether the second no-load test result is qualified; When the second no-load test result is qualified, based on a preset input power range of the charging and discharging equipment to be tested, the power grid fault simulation generating device (106) is controlled to perform three-phase symmetrical voltage raising; The data acquisition device (103) is used to collect test operation data of the charging and discharging device (102) to be tested when the electric vehicle battery simulation device (101) is charged and discharged during a three-phase symmetrical voltage raising process.

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