Parallel power supply module testing device and testing method

Abstract

The invention relates to the technical field of parallel power supply module testing, in particular to a parallel power supply module testing device and method, and the method comprises the steps: a bus load simulation module adjusts the current value and voltage value of a bus load for testing; the battery load simulation module adjusts a battery load current value and a voltage value for testing; the alternating-current voltage regulating module regulates an alternating-current input voltage value for testing; and the metering and control module switches the test items, sets test parameters corresponding to the test items, meters test response values of the parallel power supply module to be tested after the test items are executed, and triggers a test result analysis process corresponding to the test items to obtain a test result. Through cooperation of the bus load simulation module, the battery load simulation module, the AC voltage regulation module and the metering and control module, key index testing can be carried out on the AC / DC rectification circuit, the DC / DC charging circuit and the DC / DC discharging circuit, and support is provided for stable operation of the parallel DC power supply system of the transformer substation.

Description

Technical Field

[0001] The present invention relates to the technical field of parallel power module testing, and provides a parallel power module testing device and a testing method. Background Art

[0002] The substation parallel DC power supply system is a power supply system that connects multiple DC power supplies in parallel to increase the output current and system reliability. The system consists of multiple parallel power modules. As shown in the attached Figure 1 figure, each parallel power module includes a battery module and a parallel power conversion module. The battery module is responsible for storing electrical energy, and the parallel power conversion module is responsible for converting the AC power or the voltage of a single battery module into the DC bus voltage and managing the charging and discharging activities of the battery module.

[0003] The parallel power conversion module mainly includes: an AC / DC rectifier circuit, a DC / DC charging circuit, and a DC / DC discharging circuit, which are specifically as follows:

[0004] The AC / DC rectifier circuit uses electronic components and circuits to convert the input AC power into a pulsed DC power. Its AC voltage is 380V / 220V, the input voltage range is 85% to 120%, the DC output voltage is 90% to 105% of the rated value, and the current output range is 0% to 110% of the rated value.

[0005] The DC / DC charging circuit can convert the input DC voltage into a voltage and current suitable for battery charging through a chopper circuit, and is mainly used to manage the battery module to be charged with an appropriate voltage and current. Its input voltage range is 90% to 105% of the rated value, and the charging rated current is 0 to 40A.

[0006] The DC / DC discharging circuit can convert the input DC voltage into a voltage and current suitable for load use through a chopper circuit, and is mainly used for the load power supply system to ensure that the load can operate with an appropriate voltage and current. Its output voltage has a maximum output range of 1.85 to 56.4V according to the actual situation, and the discharging rated current is 0 to 40A.

[0007] The stable operation of the parallel power conversion module is crucial for the stable operation of the substation parallel DC power supply system. Currently, most of the parallel power conversion modules simply test the operating state of the AC / DC rectifier circuit and cannot effectively test each index of the AC / DC rectifier circuit, DC / DC charging circuit, and DC / DC discharging circuit. Summary of the Invention

[0008] The present invention provides a parallel power module testing device and a testing method, which overcome the deficiencies of the above-mentioned prior art and can effectively solve the problem that the prior art cannot effectively test various indexes of the AC / DC rectification circuit, the DC / DC charging circuit, and the DC / DC discharging circuit.

[0009] One of the technical solutions of the present invention is achieved by the following measures: A parallel power module testing device includes:

[0010] A bus load simulation module for adjusting the bus load current value and voltage value for testing;

[0011] A battery load simulation module for adjusting the battery load current value and voltage value for testing;

[0012] An AC voltage regulation module for adjusting the AC input voltage value for testing;

[0013] A current sharing acquisition module for obtaining the average value of the DC output current on the bus side of the parallel power module when multiple parallel power modules share the bus load current;

[0014] A metering and control module for switching test items and setting test parameters corresponding to each test item, metering the test response value of the parallel power module to be tested after executing the test item, and triggering the test result analysis process corresponding to the test item to obtain the test result, where the test response value includes the AC input voltage value, the DC output voltage value on the bus side, the ripple waveform, the average value of the DC output current on the bus side, the DC output voltage value on the battery side, the DC output current value on the battery side, the AC side power, the DC power on the battery side, and the DC power on the bus side.

[0015] The following is a further optimization or / and improvement of the above-mentioned technical solution of the invention:

[0016] The above-mentioned metering and control module includes:

[0017] An AC metering module for metering the AC input voltage value output by the AC voltage regulation module;

[0018] A DC metering module on the bus side for metering the DC output voltage value and the DC output current value on the bus side output by the parallel power module to be tested after the bus load simulation module adjusts the bus load current value for testing;

[0019] A DC metering module on the battery side for metering the DC output voltage value and the DC output current value on the battery side output by the parallel power module to be tested after the battery load simulation module adjusts the battery load current value for testing;

[0020] A waveform recording module for recording the DC output voltage value on the bus side, the ripple waveform and the peak-to-peak value of the ripple of the DC output voltage on the battery side when executing the test item.

[0021] The main control module switches the test items and sets the test parameters corresponding to each test item, controls the conduction of the circuits where the AC voltage regulation module, the bus load simulation module, and the battery load simulation module are located based on the selected test item, drives the AC metering module, the DC metering module on the bus side, the DC metering module on the battery side, and the waveform recording module to work, receives all metering data, and triggers the test result analysis process corresponding to the test item to obtain the test result. The test response values include the AC input voltage value, the DC output voltage value on the bus side, the ripple waveform, the average value of the DC output current on the bus side, the DC output voltage value on the battery side, the DC output current value on the battery side, the AC side power, the DC power on the battery side, and the DC power on the bus side.

[0022] The above-mentioned AC voltage regulation module includes an AC voltage regulator and an AC contactor. The AC voltage regulator is connected to the normally open contact of the AC contactor, and the coil of the AC contactor is connected to the main control module; the bus load simulation module includes a bus load box and a first DC contactor. The bus load box is connected to the normally open contact of the first DC contactor, and the coil of the first DC contactor is connected to the main control module; the battery load simulation module includes a battery load box and a second DC contactor. The battery load box is connected to the normally open contact of the second DC contactor, and the coil of the second DC contactor is connected to the main control module.

[0023] The above-mentioned metering and control module further includes a box body, an interaction module, and a communication module. AC wiring terminals, bus side wiring terminals, battery side wiring terminals, a control wiring terminal group, an interaction module, and a communication module are arranged on the box body. An AC metering module, a DC metering module on the bus side, a DC metering module on the battery side, a waveform recording module, and a main control module are arranged inside the box body. The AC metering module is connected to the AC wiring terminals, the DC metering module on the bus side is connected to the bus side wiring terminals, the DC metering module on the battery side is connected to the battery side wiring terminals, and the control wiring terminal group, the interaction module, and the communication module are all connected to the main control module.

[0024] The second technical solution of the present invention is achieved by the following measures: A test method for a parallel power supply module. The parallel power supply module to be tested includes an AC / DC rectification circuit, a DC / DC charging circuit, and a DC / DC discharging circuit. The method includes:

[0025] Determine the currently tested circuit among the AC / DC rectification circuit, the DC / DC charging circuit, and the DC / DC discharging circuit;

[0026] In response to the selection of the AC / DC rectifier circuit, connect the AC input terminal of the AC / DC rectifier circuit to the AC voltage regulation module, and connect the DC output terminal of the AC / DC rectifier circuit to the bus load simulation module. Use the metering and control module to select the test item, set the corresponding test parameters, measure the test response value after executing the test item based on the AC voltage regulation module, the bus load simulation module and the current sharing acquisition module, and trigger the test result analysis process corresponding to the test item to obtain the test result, including the regulated voltage ripple test, the efficiency and power factor test, the dynamic voltage transient range and transient response recovery test, the soft start characteristic test, the turn-on overshoot amplitude test and the current sharing imbalance test;

[0027] In response to the selection of the DC / DC charging circuit, connect the AC input terminal of the AC / DC rectifier circuit to the AC voltage regulation module, and connect the battery side of the DC / DC charging circuit to the battery load simulation module. Use the metering and control module to select the test item, set the corresponding test parameters, measure the test response value after executing the test item based on the AC voltage regulation module and the battery load simulation module, and trigger the test result analysis process corresponding to the test item to obtain the test result, including the regulated voltage ripple test, the constant current accuracy test, the efficiency and power factor test, the soft start characteristic test, the turn-on overshoot amplitude test;

[0028] In response to the selection of the DC / DC discharging circuit, connect the battery side of the DC / DC discharging circuit to the battery load simulation module, and connect the bus side of the DC / DC discharging circuit to the bus load simulation module. Use the metering and control module to select the test item, set the corresponding test parameters, measure the test response value after executing the test item based on the bus load simulation module and the battery load simulation module, and trigger the test result analysis process corresponding to the test item to obtain the test result, including the regulated voltage accuracy test, the constant current accuracy test, the efficiency test, the soft start characteristic test, the turn-on overshoot amplitude test.

[0029] The following is a further optimization and / or improvement of the above technical solution of the invention:

[0030] The above regulated voltage ripple test includes:

[0031] The regulated voltage ripple test includes the regulated voltage accuracy test and the ripple coefficient test;

[0032] For the regulated voltage accuracy test, according to the selected circuit, using the AC voltage regulation module, bus load simulation module, battery load simulation module, and parallel power supply module under test, select multiple DC output voltage values of the charging device or low-voltage output voltage values of the parallel power supply module or high-voltage output voltage values of the parallel power supply module, multiple AC input voltage values or battery load voltage values, and multiple bus load current values or battery load current values within the set range. Then, under the condition of setting each DC output voltage value of the charging device or low-voltage output voltage value of the parallel power supply module or high-voltage output voltage value of the parallel power supply module, the measurement and control module measures the corresponding DC output voltage value on the bus side or DC output voltage value on the battery side of each bus load current value or battery load current value at different AC input voltage values or battery load voltage values, and obtains the regulated voltage accuracy at each bus load voltage value or battery-side load voltage value by using the measured test response values through the following formula;

[0033] δ U =(U M -U z ) / U z ×100%

[0034] Wherein, δ U is the regulated voltage accuracy; U M is the maximum DC output voltage value on the bus side or the maximum DC output voltage value on the battery side at a certain DC output voltage value of the charging device or low-voltage output voltage value of the parallel power supply module or high-voltage output voltage value of the parallel power supply module; U z is the DC output voltage value on the bus side or the DC output voltage value on the battery side corresponding to the case where the AC input voltage value is the rated value and the load current is 50% of the rated value;

[0035] For the ripple coefficient test, the process is the same as that of the regulated voltage accuracy test. However, under the condition of setting each DC output voltage value of the charging device, the measurement and control module obtains the peak-to-peak ripple value corresponding to each bus load current value at different AC input voltage values, and obtains the corresponding ripple coefficient by using the measured test response values through the following formula;

[0036] δ=(U f -U g ) / 2Up×100%

[0037] Wherein, δ is the ripple coefficient; U f is the maximum peak-to-peak ripple value at a certain DC output voltage value of the charging device; U g is the minimum peak-to-peak ripple value at a certain DC output voltage value of the charging device; U p is the average value of the peak-to-peak ripple values at a certain DC output voltage value of the charging device.

[0038] The above steady current accuracy test includes: according to the selected circuit, using an AC voltage regulation module, a bus load simulation module, a battery load simulation module, a DC / DC charging circuit or a DC / DC discharging circuit, select multiple low-voltage charging current values or low-voltage discharging current values of the DC / DC charging circuit or the DC / DC discharging circuit, multiple AC input voltage values or battery load voltage values, and multiple battery load voltage values or bus load voltage values within a set range. Then, under the condition of setting each low-voltage charging current value or low-voltage discharging current value, the measurement and control module measures the corresponding DC output current value on the battery side for each battery load voltage value or bus load voltage value at different AC input voltage values or battery load voltage values. The steady current accuracy under each battery-side charging current setting value or battery-side discharging current setting value is obtained by using the measured test response values through the following formula;

[0039] δ I =(I M -I z ) / I z ×100%

[0040] where δ I is the steady current accuracy; I M is the maximum DC output current value on the battery side at a certain low-voltage charging current value or low-voltage discharging current value; I z is the DC output current value on the battery side when both the AC input voltage value and the battery load voltage value, or the bus load voltage value and the battery load voltage value are rated values.

[0041] The above efficiency and power factor test, soft start characteristic test, and startup overshoot amplitude test include:

[0042] Efficiency and power factor test: according to the selected circuit, input the bus load current value or the battery load voltage value to the rated value, collect the AC side power and the DC power on the bus side, or the AC side power and the DC power on the battery side, or the DC power on the battery side and the DC power on the bus side, and calculate the efficiency and power factor based on the collected test response values;

[0043] Soft start characteristic test: set the input voltage, output voltage, and output current of the selected circuit to the rated values, collect the output voltage waveform through the oscillograph module, and the time when the output voltage rises from 10% of the rated value to 90% of the rated value is the soft start time;

[0044] Startup overshoot amplitude test: set the input voltage, output voltage, and output current of the selected circuit to the rated values, repeatedly turn on the input voltage side multiple times, the time interval between adjacent two times is not less than 2 minutes, collect the output voltage waveform through the oscillograph module, and find the maximum overshoot voltage value.

[0045] The above dynamic voltage transient range and transient response recovery tests include:

[0046] Under the conditions of the rated AC input voltage value and the rated bus load voltage value, taking the DC output voltage value on the bus side when the bus load current value is 50% of the rated value as the reference value, making the bus load current value mutate from 25% → 50% → 25% and 50% → 75% → 50% of the rated value, collecting the output voltage waveform through the oscillograph module, obtaining the maximum DC output voltage mutation value on the bus side, and determining the transient range of the DC output voltage value on the bus side relative to the reference value and the corresponding transient response recovery time;

[0047] When the AC input is interrupted and switched to the battery module for power supply, collect the output voltage waveform through the oscillograph module, obtain the maximum DC output voltage mutation value on the bus side, and determine the transient range of the DC output voltage value on the bus side relative to the reference value and the corresponding transient response recovery time.

[0048] The above current sharing imbalance degree test is obtained through the following formula:

[0049]

[0050] Among them, δ ΔI is the current sharing imbalance degree; I lim is the maximum or minimum value of the DC output current on the bus side of a single parallel power supply module; is the average value of the DC output current on the bus side of the parallel power supply modules when the current sharing acquisition module obtains the evenly divided bus load current value of multiple parallel power supply modules; Ie is the rated value of the DC output current on the bus side of a single parallel power supply module.

[0051] The bus load simulation module and battery load simulation module of the present invention provide the bus load current value, voltage, battery load current value, and voltage required for the test. The AC voltage regulation module provides the AC input voltage value required for the test. The metering and control module switches the test items, measures the test response value of the parallel power supply module to be tested after executing the test item, and triggers the test result analysis process corresponding to the test item to obtain the test result. Thus, all key indicators of the AC / DC rectifier circuit, DC / DC charging circuit, and DC / DC discharging circuit can be effectively tested, providing support for the stable operation of the parallel DC power supply system in the substation. Description of the Drawings

[0052] Appendix Figure 1 is a schematic structural diagram of the parallel power supply module in the background technology of the present invention.

[0053] Appendix Figure 2 is a schematic structural diagram of a parallel power supply module test device provided by the present invention.

[0054] Appendix Figure 3Schematic diagram of another parallel power supply module testing device provided by the present invention.

[0055] Appendix Figure 4 Schematic diagram of the flow of the parallel power supply module testing method provided by the present invention.

[0056] Appendix Figure 5 Schematic diagram of the test wiring of the AC / DC rectification circuit provided by the present invention.

[0057] Appendix Figure 6 Schematic diagram of the test wiring of the DC / DC charging circuit provided by the present invention.

[0058] Appendix Figure 7 Schematic diagram of the test wiring of the DC / DC discharging circuit provided by the present invention. Detailed implementation manners

[0059] The present invention is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solution of the present invention and the actual situation.

[0060] The present invention will be further described below in conjunction with the embodiments and the drawings:

[0061] Embodiment 1: As shown in Appendix Figure 2 The embodiment of the present invention discloses a parallel power supply module testing device, including:

[0062] A bus load simulation module for adjusting the bus load current value and voltage value for testing;

[0063] A battery load simulation module for adjusting the battery load current value and voltage value for testing;

[0064] An AC voltage regulation module for adjusting the AC input voltage value for testing;

[0065] A current sharing acquisition module for obtaining the average value of the DC output current on the bus side of the parallel power supply module when multiple parallel power supply modules share the bus load current;

[0066] A metering and control module for switching test items and setting test parameters corresponding to each test item, metering the test response value of the parallel power supply module to be tested after executing the test item, and triggering the test result analysis process corresponding to the test item to obtain the test result, where the test response value includes the AC input voltage value, the DC output voltage value on the bus side, the ripple waveform, the average value of the DC output current on the bus side, the DC output voltage value on the battery side, the DC output current value on the battery side, the AC side power, the DC power on the battery side, and the DC power on the bus side.

[0067] In this embodiment, both the bus load simulation module and the battery load simulation module can adjust the load current value and voltage value on the bus side / battery side by adjusting the resistance. The specific parameter requirements of the bus load simulation module and the battery load simulation module can be determined according to the parallel power supply module under test that is often tested. In this embodiment, it can be but is not limited to the following settings:

[0068] For the bus load simulation module, the load capacity is 20A, the voltage range is 99 to 242V (for DC110V and DC220V systems), the control accuracy is 0.1A, the control method is 8421, and a total of 11 levels of bus load current values can be provided: 0.02A, 0.05A, 0.1A, 0.2A, 0.4A, 0.8A, 1.6A, 3.2A, 6.4A, 12.8A, 25.6A;

[0069] For the battery load simulation module, the load capacity is 60A, the voltage range is 9 to 14.4V (only considering 12V batteries), the control accuracy is 0.1A, the control method is 8421, and a total of 11 levels of battery side load currents can be provided: 0.06A, 0.125A, 0.25A, 0.5A, 1A, 2A, 4A, 8A, 16A, 32A, 32A. The corresponding battery parameters are DC0 to 15V output and current of 0 to 60A.

[0070] In this embodiment, the AC voltage regulation module adjusts the AC input voltage value for testing. The corresponding parameter requirements can be but are not limited to a capacity of 3KW, a voltage regulation range measured as 155 to 270V, and a current upper limit of 15A.

[0071] In this embodiment, the test items that can be switched by the metering and control module include: regulated voltage ripple test, regulated current accuracy test, efficiency and power factor test, dynamic voltage transient range and transient response recovery test, soft start characteristic test, turn-on overshoot amplitude test, and current sharing imbalance test, etc. It should be noted that all the test items here are set according to the requirements of the "DL / T781 High-Frequency Switching Rectifier Module" standard.

[0072] The embodiment of the present invention discloses a parallel power supply module test device. The bus load simulation module and the battery load simulation module provide the bus load current value, voltage, battery load current value, and voltage required for testing. The AC voltage regulation module provides the AC input voltage value required for testing. The metering and control module switches the test items, measures the test response value of the parallel power supply module under test after executing the test items, and triggers the test result analysis process corresponding to the test items to obtain the test result. Thus, all key indicators of the AC / DC rectification circuit, DC / DC charging circuit, and DC / DC discharging circuit can be effectively tested, providing support for the stable operation of the substation parallel DC power supply system.

[0073] Example 2: As shown in the appendixFigure 3 As shown in Figure 3 , an embodiment of the present invention discloses a parallel power supply module testing device, where:

[0074] The AC voltage regulation module includes an AC voltage regulator and an AC contactor. The AC voltage regulator is connected to the normally open contact of the AC contactor, and the coil of the AC contactor is connected to the main control module;

[0075] The bus load simulation module includes a bus load box and a first DC contactor. The bus load box is connected to the normally open contact of the first DC contactor, and the coil of the first DC contactor is connected to the main control module;

[0076] The battery load simulation module includes a battery load box and a second DC contactor. The battery load box is connected to the normally open contact of the second DC contactor, and the coil of the second DC contactor is connected to the main control module;

[0077] The current sharing acquisition module obtains the average value of the DC output current on the bus side of the parallel power supply module when obtaining the current sharing of the bus load current value of multiple parallel power supply modules; here, the current sharing acquisition module can be a current sharing acquisition circuit;

[0078] The metering and control module includes:

[0079] The AC metering module measures the AC input voltage value output by the AC voltage regulation module;

[0080] The DC metering module on the bus side measures the DC output voltage value and the DC output current value on the bus side output by the parallel power supply module to be tested after the bus load simulation module adjusts the bus load current value for testing;

[0081] The DC metering module on the battery side measures the DC output voltage value and the DC output current value on the battery side output by the parallel power supply module to be tested after the battery load simulation module adjusts the battery load current value for testing;

[0082] The oscillograph module records the DC output voltage value on the bus side, the ripple waveform and the peak-to-peak value of the ripple of the DC output voltage on the battery side when performing the test items;

[0083] The main control module switches the test items and sets the test parameters corresponding to each test item, controls the conduction of the circuits where the AC voltage regulation module, the bus load simulation module, and the battery load simulation module are located based on the selected test item, drives the AC metering module, the DC metering module on the bus side, the DC metering module on the battery side, and the oscillograph module to work, receives all metering data, triggers the test result analysis process corresponding to the test item to obtain the test result, where the test response values include the AC input voltage value, the DC output voltage value on the bus side, the ripple waveform, the average value of the DC output current on the bus side, the DC output voltage value on the battery side, the DC output current value on the battery side, the AC side power, the DC power on the battery side, and the DC power on the bus side.

[0084] The above-mentioned control of the circuits where the AC voltage regulation module, bus load simulation module, and battery load simulation module are turned on is based on the selected test items, that is, it is achieved by controlling whether the coils of the AC contactor, the first DC contactor, and the second DC contactor are energized.

[0085] Embodiment 3: The embodiment of the present invention further optimizes the above-mentioned embodiment. The metering and control module further includes a box body, an interaction module, and a communication module. AC wiring terminals, bus-side wiring terminals, battery-side wiring terminals, a control wiring terminal group, an interaction module, and a communication module are provided on the box body. An AC metering module, a bus-side DC metering module, a battery-side DC metering module, a waveform recording module, and a main control module are provided inside the box body. The AC metering module is connected to the AC wiring terminals, the bus-side DC metering module is connected to the bus-side wiring terminals, the battery-side DC metering module is connected to the battery-side wiring terminals, and the control wiring terminal group, the interaction module, and the communication module are all connected to the main control module.

[0086] The above-mentioned interaction module can be a touch display screen or a combination of a display screen and buttons. The communication module can include a USB port, a serial port, a WiFi module, etc., and can realize internal communication and external communication of the metering and control module.

[0087] Embodiment 4: As shown in the appendix Figure 4 The embodiment of the present invention discloses a method for testing a parallel power supply module, which is characterized in that the parallel power supply module to be tested includes an AC / DC rectification circuit, a DC / DC charging circuit, and a DC / DC discharging circuit. The method includes:

[0088] Step S110, determining the currently to-be-tested circuit among the AC / DC rectification circuit, the DC / DC charging circuit, and the DC / DC discharging circuit;

[0089] Step S120, in response to selecting the AC / DC rectification circuit, connecting the AC input terminal of the AC / DC rectification circuit to the AC voltage regulation module, connecting the DC output terminal of the AC / DC rectification circuit to the bus load simulation module, using the metering and control module to select a test item, setting corresponding test parameters, performing the test item based on the AC voltage regulation module, the bus load simulation module, and the current sharing acquisition module, measuring the test response value, and triggering the test result analysis process corresponding to the test item to obtain the test result, including the regulated voltage ripple test, the efficiency and power factor test, the dynamic voltage transient range and transient response recovery test, the soft start characteristic test, the turn-on overshoot amplitude test, and the current sharing imbalance test;

[0090] Step S130: In response to the selection of the DC / DC charging circuit, connect the AC input terminal of the AC / DC rectifier circuit to the AC voltage regulation module, connect the battery side of the DC / DC charging circuit to the battery load simulation module, use the metering and control module to select a test item, set corresponding test parameters, measure the test response value after executing the test item based on the AC voltage regulation module and the battery load simulation module, and trigger the test result analysis process corresponding to the test item to obtain the test result, including the regulated voltage ripple test, regulated current accuracy test, efficiency and power factor test, soft start characteristic test, and turn-on overshoot amplitude test;

[0091] Step S140: In response to the selection of the DC / DC discharging circuit, connect the battery side of the DC / DC discharging circuit to the battery load simulation module, connect the bus side of the DC / DC discharging circuit to the bus load simulation module, use the metering and control module to select a test item, set corresponding test parameters, measure the test response value after executing the test item based on the bus load simulation module and the battery load simulation module, and trigger the test result analysis process corresponding to the test item to obtain the test result, including the regulated voltage accuracy test, regulated current accuracy test, efficiency test, soft start characteristic test, and turn-on overshoot amplitude test.

[0092] Embodiment 5: The embodiment of the present invention further optimizes the above embodiments. When the AC / DC rectifier circuit is selected, the test process for the selected AC / DC rectifier circuit includes:

[0093] Step S210: Connect the AC input terminal of the AC / DC rectifier circuit to the AC voltage regulation module, and connect the DC output terminal of the AC / DC rectifier circuit to the bus load simulation module. The corresponding wiring schematic diagram is as shown in the appendix Figure 5 as follows;

[0094] Step S220: Use the metering and control module to select a test item, set corresponding test parameters, measure the test response value after executing the test item based on the AC voltage regulation module, the bus load simulation module, and the current sharing acquisition module, and trigger the test result analysis process corresponding to the test item to obtain the test result, specifically including:

[0095] (1) Select the regulated voltage ripple test, and the regulated voltage ripple test includes the regulated voltage accuracy test and the ripple coefficient test;

[0096] (a) Regulated voltage accuracy test

[0097] First, determine multiple DC output voltage values of charging devices, multiple AC input voltage values, and multiple bus load current values. It should be noted that the number of DC output voltage values of charging devices, AC input voltage values, and bus load current values is the same, and they are all selected according to the corresponding rated values;

[0098] Secondly, the main control module turns on the circuits where the AC voltage regulation module and the bus load simulation module are located, and drives the AC metering module, the DC metering module on the bus side, and the waveform recording module to work;

[0099] Next, under the condition of setting the DC output voltage value of each charging device, the DC output voltage value of the bus side corresponding to each bus load current value at different AC input voltage values is obtained, and the voltage regulation accuracy corresponding to each bus load voltage value is obtained by using the measured test response value through the following formula;

[0100] δ U =(U M -U z ) / U z ×100%

[0101] Among them, δ U is the voltage regulation accuracy; U M is the maximum DC output voltage value of the bus side corresponding to the DC output voltage value of a certain charging device; U z is the DC output voltage value of the bus side corresponding to the case where the AC input voltage value is the rated value and the bus load current value is 50% of the rated value;

[0102] Finally, the voltage regulation accuracy obtained from the test is compared with the voltage regulation accuracy requirement to obtain the corresponding test result.

[0103] (b) Ripple factor test

[0104] The wiring process and setting process of this test are the same as those of the voltage regulation accuracy test. The difference is that under the condition of setting the DC output voltage value of each charging device, the peak-to-peak value of the ripple corresponding to each bus load current value at different AC input voltage values is obtained, and the corresponding ripple factor is obtained by using the measured test response value through the following formula;

[0105] δ=(U f -U g ) / 2Up×100%

[0106] Among them, δ is the ripple factor; U f is the maximum peak-to-peak value of the ripple under the DC output voltage value of a certain charging device; U g is the minimum peak-to-peak value of the ripple under the DC output voltage value of a certain charging device; U p is the average value of the peak-to-peak value of the ripple under the DC output voltage value of a certain charging device.

[0107] For example, if the rated voltage Ue is set to 220V and the rated current Ie is set to 4A, the DC output voltages of the charging device are 90%Ue, 100%Ue, and 105%Ue respectively, the AC input voltage values are 85%Ue, 100%Ue, and 125%Ue respectively, and the bus load current values are 5%Ie, 50%Ie, and 110%Ie respectively. Using the above steps to achieve the regulation accuracy test and the ripple factor test, the test response values obtained are shown in Table 1:

[0108] Table 1 Data Sheet for Regulation Ripple Test

[0109]

[0110] Taking the bus load voltage value of 198 as an example, the calculation processes of the corresponding regulation accuracy and ripple factor are as follows:

[0111] δ U =(198.14 - 197.58)÷197.58×100% = 0.28%

[0112] δ=(1.7822 - 0.6553)÷(2×((0.6553 + 0.6607 + 0.6553 + 1.363 + 1.463 + 1.5076 + 1.6737 + 1.7822 + 1.7691)÷9))×100% = 0.45%

[0113] The requirements for regulation accuracy and ripple factor are shown in Table 2:

[0114] Table 2 Requirements Table for Regulation Ripple Test

[0115] Parameter type Result requirement Voltage regulation accuracy ≤±0.5％ Ripple factor ≤0.5％

[0116] Substituting Table 1 into Table 2 for comparison, it is found that all three tests meet the requirements.

[0117] (2) Select the efficiency and power factor test

[0118] Adjust the AC input voltage to the set value of 220V, input the rated bus load current value, collect the AC side power and the DC power on the bus side, and calculate the efficiency and power factor based on the collected test response values; among them, the requirements for the efficiency and power factor test can be shown in Table 3:

[0119] Table 3 Requirements Table for Regulation Ripple Test

[0120] Parameter type Result requirement Efficiency ≥0.9 Power factor ≥0.9

[0121] (3) Dynamic voltage transient range and transient response recovery test

[0122] Under the conditions of the rated AC input voltage value and the rated bus load voltage value, take the DC output voltage value on the bus side when the bus load current value is 50% of the rated value as the reference value, and make the bus load current value mutate from 25% → 50% → 25% and 50% → 75% → 50% of the rated value. Collect the output voltage waveform through the oscillograph module to obtain the maximum DC output voltage mutation value on the bus side, and determine the transient range of the DC output voltage value on the bus side relative to the reference value and the corresponding transient response recovery time (the time from the moment when it exceeds the voltage stabilization accuracy range to the moment when it returns to within the voltage stabilization accuracy range and no longer exceeds this range);

[0123] When the AC input is interrupted and switched to the battery module for power supply (mutual switching of power supply methods), collect the output voltage waveform through the oscillograph module to obtain the maximum DC output voltage mutation value on the bus side, and determine the transient range of the DC output voltage value on the bus side relative to the reference value and the corresponding transient response recovery time (the time from the moment when it exceeds the voltage stabilization accuracy range to the moment when it returns to within the voltage stabilization accuracy range and no longer exceeds this range);

[0124] The above test requirements are as follows:

[0125] For the DC output voltage change caused by load mutation, the dynamic voltage transient range of the parallel power conversion module should not exceed ±5% of the rated output voltage, and the transient response recovery time should not exceed 200 μs;

[0126] When the AC input is interrupted and switched to the battery module for power supply (mutual switching of power supply methods), the dynamic voltage transient range of the parallel power conversion module should not exceed ±5% of the rated output voltage, and the transient response recovery time should not exceed 10 ms.

[0127] (4) Soft start characteristic test

[0128] Set the AC input voltage value, bus load voltage value, and bus load current value to the rated values. Collect the DC output voltage waveform on the bus side through the oscillograph module, and the time for the DC output voltage value on the bus side to rise from 10% of the rated value to 90% of the rated value is the soft start time.

[0129] The test requirement for the soft start characteristic test can be that the soft start time is set to 3 s to 8 s.

[0130] (5) Inrush amplitude test at startup

[0131] Set the AC input voltage value, bus load voltage value, and bus load current value to the rated values. Turn on the input voltage side repeatedly for multiple times, and the time interval between two adjacent times is not less than 2 min. Collect the DC output voltage waveform on the bus side through the oscillograph module, and find the maximum inrush DC output voltage value on the bus side.

[0132] The test requirement for the overshoot amplitude during startup can be that the voltage overshoot amplitude should not exceed 5% of its rated value.

[0133] (6) Current sharing imbalance test

[0134] During the test, it is in the range of 50% - 100% of the total rated current value of multiple parallel power supply modules.

[0135] The current sharing imbalance test is obtained through the following formula:

[0136]

[0137] Among them, δ ΔI is the current sharing imbalance; I lim is the maximum or minimum value of the DC output current on the bus side of a single parallel power supply module; is the average value of the DC output current on the bus side of the parallel power supply modules when the current sharing acquisition module obtains the average bus load current value of multiple parallel power supply modules; Ie is the rated value of the DC output current on the bus side of a single parallel power supply module.

[0138] Embodiment 6: The embodiment of the present invention is a further optimization of the above embodiment. Among them, a DC / DC charging circuit is selected. For the test process of the selected DC / DC charging circuit, it includes:

[0139] Step S310, connect the AC input end of the AC / DC rectification circuit to the AC voltage regulation module, and connect the DC output end of the DC / DC charging circuit to the battery load simulation module. The corresponding wiring schematic diagram is as shown in the appendix Figure 6 as shown;

[0140] Step S320, use the metering and control module to select the test item, set the corresponding test parameters, measure the test response value based on the AC voltage regulation module and the battery load simulation module after executing the test item, and trigger the test result analysis process corresponding to the test item to obtain the test result. Specifically, it includes:

[0141] (1) Voltage regulation accuracy test

[0142] First, determine the low - voltage output voltage values of multiple parallel power supply modules, multiple AC input voltage values, and multiple battery load current values. It should be noted that the number of low - voltage output voltage values of parallel power supply modules, AC input voltage values, and battery load current values is the same, and they are all selected according to the corresponding rated values;

[0143] Secondly, the main control module turns on the circuits where the AC voltage regulation module and the battery load simulation module are located, and drives the AC metering module, the DC metering module on the battery side, and the oscillograph module to work;

[0144] Next, under the condition of setting the low-voltage output voltage value of each parallel power supply module, obtain the DC output voltage value on the battery side corresponding to each battery load current value at different AC input voltage values, and obtain the voltage regulation accuracy corresponding to each battery load voltage value by using the measured test response value through the following formula;

[0145] δ U =(U M -U z ) / U z ×100%

[0146] where, δ U is the voltage regulation accuracy; U M is the maximum DC output voltage value on the battery side corresponding to the low-voltage output voltage value of a certain parallel power supply module; U z is the DC output voltage value on the battery side corresponding to the case where the AC input voltage value is the rated value and the battery load current value is 50% of the rated value;

[0147] Finally, compare the measured voltage regulation accuracy with the voltage regulation accuracy requirement to obtain the corresponding test result.

[0148] For example, set the rated voltage Ue to 220V and the rated current Ie to 4A. Then the low-voltage output voltage values of the parallel power supply module are 11.1V, 13.5V, and 14.1V respectively, the AC input voltage values are 85%Ue, 100%Ue, and 125%Ue respectively, and the battery load current values are 5%Ie, 50%Ie, 110%Ie respectively. Use the above steps to implement the voltage regulation accuracy test, and the obtained test response values are shown in Table 4:

[0149] Table 4 Voltage Regulation Ripple Test Data Table

[0150]

[0151] The voltage regulation accuracy requirements are shown in Table 5:

[0152] Table 5 Voltage Regulation Ripple Test Requirement Table

[0153] Parameter type Result requirement Voltage regulation accuracy ≤1.0％

[0154] Substitute Table 4 into Table 5 for comparison and find that all three tests meet the requirements.

[0155] (2) Constant Current Accuracy Test

[0156] First, determine multiple battery load voltage values, multiple AC input voltage values, and multiple low-voltage charging current values. It should be noted that the number of battery load voltage values, AC input voltage values, and low-voltage charging current values is the same, and they are all selected according to the corresponding rated values;

[0157] Secondly, the main control module turns on the circuits where the AC voltage regulation module and the battery load simulation module are located, and drives the AC metering module, the DC metering module on the battery side, and the waveform recording module to work;

[0158] Next, under the condition of setting each low-voltage charging current value, the DC output current value on the battery side corresponding to each battery load voltage value at different AC input voltage values is obtained, and the constant current accuracy corresponding to each battery load current value is obtained by using the measured test response value through the following formula;

[0159] δ I =(I M -I z ) / I z ×100%

[0160] where, δ I is the constant current accuracy; I M is the maximum DC output current value on the battery side under a certain low-voltage charging current value; I z is the DC output current value on the battery side when both the AC input voltage value and the battery load voltage value are rated values.

[0161] For example, set the rated low-voltage charging current value Ie to 50A, the rated AC input voltage value Ue to 220V, then the battery load voltage values include 11.1V, 13.5V, 14.1V, the AC input voltage values include 85%Ue, 100%Ue and 125%Ue, and the low-voltage charging current values include 20%Ie, 50%Ie and 100%Ie. Use the above steps to implement the constant current accuracy test, and the obtained test response values are shown in Table 6:

[0162] Table 6 Constant Current Test Data Table

[0163]

[0164] The requirements for constant current accuracy are shown in Table 7:

[0165] Table 7 Constant Current Test Requirements Table

[0166] Parameter type Result requirement Current stabilization accuracy ≤1.0％

[0167] Substitute Table 6 into Table 7 for comparison and find that all three tests meet the requirements.

[0168] (3) Selection of Efficiency and Power Factor Test

[0169] Adjust the AC input voltage to the set value of 220V, input the rated battery load current value, collect the AC side power and the DC power on the battery side, and calculate the efficiency and power factor based on the collected test response values; the test requirements for efficiency and power factor can be shown in Table 8:

[0170] Table 8 Voltage Regulation Ripple Test Requirements Table

[0171] Parameter type Result requirement Efficiency ≥0.9 Power factor ≥0.9

[0172] (4) Soft Start Characteristic Test

[0173] Set the AC input voltage value, battery load voltage value, and battery load current value to their rated values. Collect the DC output voltage waveform on the battery side through the oscillograph module. The time it takes for the DC output voltage value on the battery side to rise from 10% of the rated value to 90% of the rated value is the soft start time.

[0174] The test requirement for the soft start characteristic test can be that the soft start time is set to 3 s to 8 s.

[0175] (5) Power-on Overshoot Amplitude Test

[0176] Set the AC input voltage value, battery load voltage value, and battery load current value to their rated values. Repeatedly turn on the input voltage side multiple times, with the time interval between adjacent two times not less than 2 min. Collect the DC output voltage waveform on the battery side through the oscillograph module, and find the maximum overshoot DC output voltage value on the battery side.

[0177] The test requirement for the power-on overshoot amplitude test can be that the voltage overshoot amplitude should not exceed 5% of its rated value.

[0178] Embodiment 7: The embodiment of the present invention is a further optimization of the above embodiments. Among them, an AC / DC rectifier circuit is selected. The test process for the selected DC / DC discharge circuit includes:

[0179] Step S410, connect the battery side of the DC / DC discharge circuit to the battery load simulation module, and connect the bus side of the DC / DC discharge circuit to the bus load simulation module. The corresponding wiring schematic diagram is as shown in the appendix Figure 7 as shown;

[0180] Step S420, use the metering and control module to select the test item, set the corresponding test parameters, measure the test response value based on the bus load simulation module and the battery load simulation module after executing the test item, and trigger the test result analysis process corresponding to the test item to obtain the test result. Specifically, it includes:

[0181] (1) Voltage Regulation Accuracy Test

[0182] First, determine the high-voltage output voltage values of multiple parallel power supply modules, multiple battery load voltage values, and multiple bus load current values. It should be noted that the number of high-voltage output voltage values of the parallel power supply modules, battery load voltage values, and bus load current values is the same, and they are all selected according to the corresponding rated values;

[0183] Secondly, the main control module turns on the circuits where the bus load simulation module and the battery load simulation module are located, and drives the DC metering module on the bus side to work;

[0184] Next, under the condition of setting the high-voltage output voltage value of each parallel power supply module, obtain the DC output voltage value on the bus side corresponding to each bus load current value at different battery load voltage values, and use the following formula to obtain the voltage regulation accuracy corresponding to the high-voltage output voltage value of each parallel power supply module by using the measured test response value;

[0185] δ U =(U M -U z ) / U z ×100%

[0186] Among them, δ U is the voltage regulation accuracy; U M is the maximum DC output voltage value on the battery side corresponding to a certain high-voltage output voltage value of the parallel power supply module; U z is the DC output voltage value on the bus side corresponding to the case where the battery load voltage value is the rated value and the bus load current value is 50% of the rated value;

[0187] Finally, compare the measured voltage regulation accuracy with the voltage regulation accuracy requirement to obtain the corresponding test result.

[0188] For example, set the rated DC output voltage Ue of the parallel power supply module to 220V and the rated current Ie to 4A. Then the battery load voltage values are 11.1V, 13.5V (rated value), and 14.1V respectively, the high-voltage output voltage values of the parallel power supply module are 85%Ue, 100%Ue, and 125%Ue respectively, and the bus load current values are 5%Ie, 50%Ie, and 110%Ie respectively. Use the above steps to implement the voltage regulation accuracy test, and the measured test response values are shown in Table 9:

[0189] Table 9 Data table of voltage regulation ripple test

[0190]

[0191] The voltage regulation accuracy requirements are shown in Table 10:

[0192] Table 10 Requirements table of voltage regulation ripple test

[0193] Parameter type Result requirement Voltage regulation accuracy ≤0.5％

[0194] Substitute Table 9 into Table 10 for comparison and find that all three tests meet the requirements.

[0195] (2) Constant current accuracy test

[0196] First, determine multiple battery load voltage values, multiple bus load voltage values, and multiple low-voltage discharge current values. It should be noted that the number of battery load voltage values, bus load voltage values, and low-voltage discharge current values is the same, and they are all selected according to the corresponding rated values;

[0197] Secondly, the main control module turns on the circuits where the bus load simulation module and the battery load simulation module are located, and drives the bus-side DC metering module to work;

[0198] Next, under the condition of setting each low-voltage discharge current value, obtain the battery-side DC output current values corresponding to each bus load voltage value at different battery load voltage values, and use the following formula to obtain the steady current accuracy corresponding to each battery load current value by using the measured test response values;

[0199] δ I =(I M -I z ) / I z ×100%

[0200] Where, δ I is the steady current accuracy; I M is the maximum battery-side DC output current value under a certain low-voltage discharge current value; I z is the battery-side DC output current value when both the bus load voltage value and the battery load voltage value are rated values.

[0201] For example, set the rated low-voltage discharge current value Ie to 50A, and the rated value Ue of the bus load voltage value to 220V. Then the battery load voltage values include 11.1V, 13.5V, and 14.1V, the bus load voltage values include 85%Ue, 100%Ue, and 125%Ue, and the low-voltage discharge current values include 20%Ie, 50%Ie, and 100%Ie. Use the above steps to implement the steady current accuracy test, and the obtained test response values are shown in Table 11:

[0202] Table 11 Steady Current Test Data Table

[0203]

[0204] The requirements for steady current accuracy are shown in Table 12:

[0205] Table 12 Steady Current Test Requirements Table

[0206] Parameter type Result requirement Current stabilization accuracy ≤1.0％

[0207] Substitute Table 11 into Table 12 for comparison and find that all three tests meet the requirements.

[0208] (3) Selection Efficiency Test

[0209] Adjust the AC input voltage to the set value of 220V, input the rated battery load current value, collect the DC power on the bus side and the DC power on the battery side, and calculate the efficiency factor based on the collected test response values; the efficiency test requirements can be as shown in Table 8:

[0210] Table 13 Regulation Ripple Test Requirements Table

[0211] Parameter type Result requirement Efficiency ≥0.9

[0212] (4) Soft Start Characteristic Test

[0213] Set the battery load voltage value, bus load voltage value, and bus load current value to their rated values. Collect the DC output voltage waveform on the bus side through the oscillograph module. The time for the DC output voltage value on the bus side to rise from 10% of the rated value to 90% of the rated value is the soft start time.

[0214] The test requirement for the soft start characteristic test can be that the soft start time is set to 3s to 8s.

[0215] (5) Power-On Overshoot Amplitude Test

[0216] Set the battery load voltage value, bus load voltage value, and bus load current value to their rated values. Turn on the input voltage side repeatedly for multiple times, with the time interval between adjacent two times not less than 2 minutes. Collect the DC output voltage waveform on the bus side through the oscillograph module, and find the maximum overshoot DC output voltage value on the bus side.

[0217] The test requirement for the power-on overshoot amplitude test can be that the voltage overshoot amplitude should not exceed 5% of its rated value.

[0218] The above content is only the specific implementation manner of this application, which has strong adaptability and implementation effects. However, the protection scope of this application is not limited to this. Any person skilled in the art in the technical field disclosed by this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, equivalent changes made according to the claims of this application still fall within the scope covered by this application.

Claims

1. A parallel power supply module testing device, characterized in that Including: A bus load simulation module for adjusting the bus load current value and voltage value for testing; A battery load simulation module for adjusting the battery load current value, voltage value, battery power supply current value and voltage value for testing; An AC voltage regulation module for adjusting the AC input voltage value for testing; A current sharing acquisition module for acquiring the DC output current values on the bus side of multiple parallel power supply modules; A metering and control module for switching test items and setting test parameters corresponding to each test item, metering the test response values of the parallel power supply modules to be tested after executing the test items, and triggering the test result analysis process corresponding to the test items to obtain the test results, where the test response values include AC input voltage value, current value, power value, DC output voltage value, voltage ripple waveform, current value, power value on the bus side, DC output voltage value, voltage ripple waveform, current value, power value on the battery side, and DC input voltage value, current value, power value on the battery side.

2. The parallel power supply module testing device according to claim 1, characterized in that, The metering and control module includes: An AC metering module for metering the AC input voltage value, current value and power value output by the AC voltage regulation module; A DC metering module on the bus side for metering the DC output voltage value, current value and power value on the bus side output by the parallel power supply modules to be tested after the bus load simulation module adjusts the bus load current value for testing; A DC metering module on the battery side for metering the DC output voltage value, voltage ripple waveform, current value and power value on the battery side of the parallel power supply modules to be tested, and the DC input voltage value, current value and power value on the battery side after the battery load simulation module adjusts the battery load current value for testing; A waveform recording module for recording the DC output voltage value on the bus side, the DC output voltage ripple waveform and the ripple peak-to-peak value on the battery side when the test item is executed; A main control module for switching test items and setting test parameters corresponding to each test item, controlling the conduction of the circuits where the AC voltage regulation module, the bus load simulation module and the battery load simulation module are located based on the selected test item, driving the AC metering module, the DC metering module on the bus side, the DC metering module on the battery side and the waveform recording module to work, receiving all metering data, and triggering the test result analysis process corresponding to the test item to obtain the test results, where the test response values include AC input voltage value, current value, power value, DC output voltage value, voltage ripple waveform, current value, power value on the bus side, DC output voltage value, voltage ripple waveform, current value, power value on the battery side, and DC input voltage value, current value, power value on the battery side.

3. The parallel power supply module testing device according to claim 2, wherein The AC voltage regulation module includes an AC voltage regulator and an AC contactor. The AC voltage regulator is connected to the normally open contact of the AC contactor, and the coil of the AC contactor is connected to the main control module; the bus load simulation module includes a bus load box and a first DC contactor. The bus load box is connected to the normally open contact of the first DC contactor, and the coil of the first DC contactor is connected to the main control module; the battery load simulation module includes a battery load box and a second DC contactor. The battery load box is connected to the normally open contact of the second DC contactor, and the coil of the second DC contactor is connected to the main control module.

4. The parallel power supply module testing device according to claim 3, wherein The metering and control module further includes a box body, an interaction module, and a communication module. An AC wiring terminal, a bus-side wiring terminal, a battery-side wiring terminal, a control wiring terminal group, an interaction module, and a communication module are provided on the box body. An AC metering module, a bus-side DC metering module, a battery-side DC metering module, a waveform recording module, and a main control module are provided inside the box body. The AC metering module is connected to the AC wiring terminal, the bus-side DC metering module is connected to the bus-side wiring terminal, the battery-side DC metering module is connected to the battery-side wiring terminal, and the control wiring terminal group, the interaction module, and the communication module are all connected to the main control module.

5. A parallel power supply module testing method applied to the device described in any one of claims 1 to 4, characterized in that The parallel power supply module to be measured includes an AC / DC rectification circuit, a DC / DC charging circuit, and a DC / DC discharging circuit. The method includes: Determine the current circuit to be measured among the AC / DC rectification circuit, the DC / DC charging circuit, and the DC / DC discharging circuit; In response to selecting the AC / DC rectification circuit, connect the AC input terminal of the AC / DC rectification circuit to the AC voltage regulation module, connect the DC output terminal of the AC / DC rectification circuit to the bus load simulation module, use the metering and control module to select a test item, set corresponding test parameters, measure the test response value after executing the test item based on the AC voltage regulation module, the bus load simulation module, and the current sharing acquisition module, and trigger the test result analysis process corresponding to the test item to obtain the test result; In response to selecting the DC / DC charging circuit, connect the AC input terminal of the AC / DC rectification circuit to the AC voltage regulation module, connect the battery side of the DC / DC charging circuit to the battery load simulation module, use the metering and control module to select a test item, set corresponding test parameters, measure the test response value after executing the test item based on the AC voltage regulation module and the battery load simulation module, and trigger the test result analysis process corresponding to the test item to obtain the test result; In response to selecting the DC / DC discharging circuit, connect the battery side of the DC / DC discharging circuit to the battery load simulation module, connect the bus side of the DC / DC discharging circuit to the bus load simulation module, use the metering and control module to select a test item, set corresponding test parameters, measure the test response value after executing the test item based on the bus load simulation module and the battery load simulation module, and trigger the test result analysis process corresponding to the test item to obtain the test result; Among them, the test items include regulated voltage ripple test, regulated voltage accuracy test, efficiency and power factor test, dynamic voltage transient range and transient response recovery test, soft start characteristic test, turn-on overshoot amplitude test, and current sharing imbalance test.

6. The parallel power supply module testing method according to claim 5, wherein The regulated voltage ripple test includes: The regulated voltage ripple test includes a regulated voltage accuracy test and a ripple coefficient test; The regulated voltage accuracy test is as follows: According to the selected circuit, using an AC voltage regulation module, a bus load simulation module, a battery load simulation module, and a parallel power supply module under test, select multiple DC output voltage values of the charging device or low-voltage output voltage values of the parallel power supply module or high-voltage output voltage values of the parallel power supply module, multiple AC input voltage values or battery load voltage values, and multiple bus load current values or battery load current values within the set range. Then, under the condition that the metering and control module sets each DC output voltage value of the charging device or low-voltage output voltage value of the parallel power supply module or high-voltage output voltage value of the parallel power supply module, measure the DC output voltage value on the bus side or the DC output voltage value on the battery side corresponding to each bus load current value or battery load current value at different AC input voltage values or battery load voltage values. Use the measured test response values through the following formula to obtain the regulated voltage accuracy at each bus load voltage value or battery-side load voltage value; δ U = (U M - U z ) / U z × 100% Among them, δ U is the voltage regulation accuracy; U M is the maximum DC output voltage value on the bus side or the maximum DC output voltage value on the battery side under the DC output voltage value of a certain charging device or the low-voltage output voltage value of the parallel power supply module or the high-voltage output voltage value of the parallel power supply module; U z is the DC output voltage value on the bus side or the DC output voltage value on the battery side corresponding to the case where the AC input voltage value is the rated value and the load current is 50% of the rated value; The ripple coefficient test is the same as the regulated voltage accuracy test process, but under the condition that the metering and control module sets each DC output voltage value of the charging device, obtain the peak-to-peak ripple value corresponding to each bus load current value at different AC input voltage values. Use the measured test response values through the following formula to obtain the corresponding ripple coefficient; δ = (U f - U g ) / 2Up × 100% Among them, δ is the ripple coefficient; U f is the maximum peak-to-peak value of the ripple under a certain DC output voltage value of a charging device; U g is the minimum peak-to-peak value of the ripple under a certain DC output voltage value of a charging device; U p is the average value of the peak-to-peak value of the ripple under a certain DC output voltage value of a charging device.

7. The parallel power supply module testing method according to claim 5 or 6, characterized in that The regulated current accuracy test includes: According to the selected circuit, using an AC voltage regulation module, a bus load simulation module, a battery load simulation module, a DC / DC charging circuit or a DC / DC discharging circuit, select multiple low-voltage charging current values or low-voltage discharging current values of the DC / DC charging circuit or the DC / DC discharging circuit, multiple AC input voltage values or battery load voltage values, and multiple battery load voltage values or bus load voltage values within the set range. Then, under the condition that the metering and control module sets each low-voltage charging current value or low-voltage discharging current value, measure the DC output current value on the battery side corresponding to each battery load voltage value or bus load voltage value at different AC input voltage values or battery load voltage values. Use the measured test response values through the following formula to obtain the regulated current accuracy at each set value of the charging current on the battery side or the discharging current on the battery side; δ I =(I M -I z ) / I z ×100% Among them, δ I is the steady current accuracy; I M is the maximum DC output current value on the battery side under a certain low-voltage charging current value or low-voltage discharging current value; I z is the DC output current value on the battery side when both the AC input voltage value and the battery load voltage value, or the bus load voltage value and the battery load voltage value are rated values.

8. The parallel power supply module testing method according to any one of claims 5 to 7, characterized in that The efficiency and power factor test, the soft start characteristic test, and the inrush voltage amplitude test during startup include: The efficiency and power factor test: According to the selected circuit, input the bus load current value or the battery load voltage value to the rated value, collect the AC-side power and the DC power on the bus side, or the AC-side power and the DC power on the battery side, or the DC power on the battery side and the DC power on the bus side, and calculate the efficiency and power factor based on the collected test response values; The soft start characteristic test: Set the input voltage, output voltage, and output current of the selected circuit to the rated values, collect the output voltage waveform through the oscilloscope module, and the time when the output voltage rises from 10% of the rated value to 90% of the rated value is the soft start time; The inrush voltage amplitude test during startup: Set the input voltage, output voltage, and output current of the selected circuit to the rated values, repeatedly turn on the input voltage side multiple times, and the time interval between two adjacent times is not less than 2 minutes. Collect the output voltage waveform through the oscilloscope module and find the maximum inrush voltage value.

9. The parallel power supply module testing method according to any one of claims 5 to 8, characterized in that Dynamic voltage transient range and transient response recovery test, including: Under the conditions of the rated AC input voltage value and the rated bus load voltage value, taking the DC output voltage value on the bus side when the bus load current value is 50% of the rated value as the reference value, making the bus load current value mutate from 25% → 50% → 25% and 50% → 75% → 50% of the rated value, collecting the output voltage waveform through the oscillograph module, obtaining the maximum DC output voltage mutation value on the bus side, and determining the transient range of the DC output voltage value on the bus side relative to the reference value and the corresponding transient response recovery time; When the AC input is interrupted and switched to the battery module for power supply, collecting the output voltage waveform through the oscillograph module, obtaining the maximum DC output voltage mutation value on the bus side, and determining the transient range of the DC output voltage value on the bus side relative to the reference value and the corresponding transient response recovery time.

10. The parallel power supply module testing method according to any one of claims 5 to 9, characterized in that, The current sharing unbalance degree test is obtained by the following formula: Among them, δ ΔI is the current sharing imbalance; I lim is the maximum or minimum value of the DC output current on the bus side of a single parallel power supply module; is the average value of the DC output current on the bus side of the parallel power supply modules when the current sharing acquisition module obtains the average bus load current values of multiple parallel power supply modules; Ie is the rated value of the DC output current on the bus side of a single parallel power supply module.

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