Electric vehicle test energy processing system and method

Abstract

The invention provides an electric vehicle test energy processing system and method, and the system comprises a pre-stage subsystem which is provided with an AC-DC converter and / or a DC-DC converter in a circuit, and is used for connecting the energy input of a test object; a direct-current bus capacitor and a pre-charging resistor are arranged in a circuit of the intermediate-stage subsystem, and the intermediate-stage subsystem is used for performing voltage stabilization and filtering on the electric energy preliminarily processed by the front-stage subsystem and then inputting the electric energy to the rear-stage subsystem; and the post-stage subsystem is used for outputting the voltage-stabilized and filtered electric energy. The system has multiple energy processing modes, and electric energy input by a preceding stage or converted from mechanical energy can be processed in multiple modes, including dissipation, storage, secondary power supply and grid-connected processing; the system has a good hierarchical structure, the compatibility and universality are improved, the working efficiency of each subsystem is improved, and the electric energy is saved to the maximum extent.

Description

Technical Field

[0001] The invention belongs to the technical field of electric vehicle test bench design, and in particular relates to an electric vehicle test energy processing system and method. Background Art

[0002] The current test equipment used for new energy vehicle power systems and their high-voltage components such as motors and high-voltage batteries mainly dissipates the energy emitted by the tested equipment such as the tested motors and tested batteries, that is, consumes it in the form of heat energy. This energy-consuming equipment causes a lot of energy waste during large-scale and long-term testing, and also brings a lot of additional costs to the company. From the perspective of increasing the versatility of equipment, saving energy, increasing energy reuse, and reducing costs, it is necessary to propose a universal method for testing and processing high-voltage components of automotive power systems that can recycle energy and is compatible with multiple energy processing methods. The relevant solutions for testing vehicle power system components currently used by automobile companies include: motor bench dynamometers are used to test the various characteristics of automotive drive motors; high-voltage battery test benches are used to test the characteristics of high-voltage battery packs; and rotary hub test chambers are used for vehicle testing.

[0003] The motor controller test bench usually needs to be combined with the motor body as the controller load, and its test conditions and test range are limited by the controlled motor. Battery test benches on the market generally use large resistors for consumption, or feed back to the grid through DC-AC converters. This type of equipment is not very versatile, and there are not many forms of control for battery output current. The battery voltage has a greater impact on the inverter and grid connection effect. The motor body test bench usually uses a dynamometer as the motor load. The electric energy generated by the dynamometer is mainly dissipated by a large resistor or fed back to the grid. The vehicle hub test bench provides the vehicle with simulated road resistance through the wheel end hub. After the wheel drags the hub to rotate, its energy is dissipated through the resistor. In short, non-universal methods and equipment are usually used in the testing of many electric vehicles and their high-voltage components. The motor bench, battery bench, and vehicle hub equipment are independent of each other, and the energy processing form is single, and it is mainly in the form of energy consumption, that is, the input energy is converted into heat energy consumption, and there is a certain idle rate, which ultimately causes energy and resource waste.

[0004] Invention patent content

[0005] In response to the above problems, the present invention provides an electric vehicle test energy processing system and method, which aims to provide an electric energy processing method with a universal structure that can be used in the pure electric vehicle test process, which can be used for the test of high-voltage components related to the pure electric vehicle drive system, and can also be applied to the energy coordination processing during the whole vehicle hub test. Its outstanding features are that it has a compatible and reused topological structure and obvious versatility. Multiple interfaces can test different types of objects, increase the system's efficiency and working environment; it has a variety of energy processing methods, and can process the electric energy input from the previous stage or converted from mechanical energy in a variety of ways, including dissipation, storage, as a secondary power source and grid-connected processing; it has a good hierarchical structure, increases compatibility and versatility, improves the working efficiency of each subsystem, and maximizes energy saving. The purpose of the present invention is achieved through the following technical solutions:

[0006] The present invention first provides an electric vehicle test energy processing system, which is mainly divided into a three-level structure: the front-stage subsystem is responsible for processing the energy of the input system, the middle stage is mainly responsible for voltage stabilization and filtering, and the rear-stage subsystem is mainly responsible for energy processing. Specifically, the system includes:

[0007] A front-stage subsystem, in which an AC-DC converter and / or a DC-DC converter is provided in its circuit for connecting the energy input of the test object;

[0008] The intermediate subsystem has a DC bus capacitor in its circuit, which is used to stabilize and filter the electric energy preliminarily processed by the previous subsystem and then input it into the subsequent subsystem;

[0009] The subsequent subsystem has a DC-AC inverter and / or a DC-DC converter in its circuit, which is used to output the stabilized and filtered electric energy.

[0010] Furthermore, the front-stage subsystem is provided with a three-phase AC input interface and a DC input interface; the front-stage subsystem has a first circuit unit capable of realizing DC-DC conversion, single-phase AC-DC conversion and three-phase AC-DC conversion, and the first circuit unit is provided with an IGBT and an inductor element.

[0011] Furthermore, the first circuit unit has a switch element, an inductor element, a diode, and a three-phase bridge circuit formed by connecting the first circuit unit and six switch tubes with reverse-connected diodes.

[0012] Furthermore, the power output mode of the post-stage subsystem includes at least two of the following: grid connection, energy storage, energy consumption and secondary power supply.

[0013] Furthermore, the post-stage subsystem has a second circuit unit capable of realizing DC-AC inversion and DC-DC conversion, the second circuit unit has a bridge conversion circuit, and the post-stage subsystem has a DC output port and an AC output port. The post-stage subsystem body of the present invention adopts the topological form of a bridge conversion circuit, and the circuit can be reused and switched in conjunction with a switch. The main function of the post-stage subsystem is to realize four energy processing methods: 1. DC-AC conversion incorporates electrical energy into the power grid with a high power factor; 2. DC-DC conversion can be realized to store electrical energy in energy storage devices such as batteries and supercapacitors; 3. Through DC-DC conversion as a secondary DC power supply to provide electrical energy to other electrical appliances; 4. Dissipate energy in the form of heat through energy-consuming components such as resistors.

[0014] Furthermore, the second circuit unit is provided with an inductor element and an H-bridge circuit formed by connecting the inductor element and four switch tubes with reverse-connected diodes, a selection switch for grid connection or energy storage output, and the circuit for energy storage output is provided with an energy storage device supercapacitor and an energy storage device battery.

[0015] Furthermore, the intermediate subsystem has a DC bus capacitor, a pre-charge resistor and a pre-charge switch. The pre-charge switch preferably adopts a selection switch, which switches the connection contacts according to the needs of energy conversion processing to directly connect to the bus or forms a pre-charge circuit by connecting the pre-charge switch to a line with a pre-charge resistor when pre-charging is required. The DC bus capacitor of the intermediate subsystem mainly isolates the front-stage subsystem and the rear-stage subsystem, realizes voltage stabilization and filtering, provides stable power input for the rear-stage subsystem, improves the energy processing efficiency of the rear-stage subsystem, and can cooperate with the pre-charge resistor to have a pre-charge function.

[0016] The present invention further provides an electric vehicle test energy processing method, which connects the power input of the test mechanism through a front-stage subsystem, adjusts the circuit state according to the power output mode to control the output current and bus voltage of the test battery, so that the power input to the system is stabilized and filtered by the intermediate-stage subsystem and then outputted through the rear-stage subsystem.

[0017] Further, the test energy processing method includes:

[0018] When the test object is a motor controller / inverter, the three-phase input interface receives the power input of the tested motor inverter, and the front-end subsystem controls the current amplitude and phase difference of the three-phase AC input to simulate the load, while stably controlling the DC bus voltage to achieve stable power transmission;

[0019] When the test object is the drive motor body tested by the dynamometer, the three-phase input interface receives the power input of the dynamometer, controls the speed and current of the dynamometer through the front-end subsystem, obtains the electrical parameters of the dynamometer and the test object, and stably controls the bus voltage;

[0020] When the test object is the performance of the whole vehicle using a rotating hub test, the three-phase AC input interface receives the electric energy transmitted by the three-phase power supply of the generator, and the front-stage subsystem acts as the controller of the generator to provide resistance for the whole vehicle's rotating hub and stably controls the DC bus voltage;

[0021] When the test object is a DC device, the input current is controlled by the front-end subsystem to simulate the DC load and control the DC bus voltage.

[0022] Further, the method comprises the following steps:

[0023] Step S1: When the test starts, a test object is selected, and the test energy is input into the front-stage subsystem according to the corresponding input port connection of the selected test object;

[0024] Step S2: Determine whether to pre-charge the power grid, and complete pre-charging the system according to the determination result;

[0025] Step S3: When the test starts, an energy processing method is selected, and the circuit state of the subsequent subsystem is adjusted according to the selected energy processing method;

[0026] Step S4: adjusting the circuit states of the front-stage subsystem and the intermediate-stage subsystem according to the selected energy mode;

[0027] Step S5: Discharge the bus capacitor when the test is completed.

[0028] The beneficial effects of the present invention are:

[0029] (1) The energy processing system of the present invention is versatile, and multiple interfaces can be used to test various types of component objects; the DC test topology has a two-stage boost circuit, which can have a higher boost ratio, and thus can be used for test objects with a wider voltage range;

[0030] (2) The circuit topology of the present invention adopts a multiplexing design scheme, which saves components and reduces costs while being compatible with a variety of test objects. Circuit switching is achieved by selecting switches and software control schemes; combined with the current control methods of each circuit, the present invention can replace actual energy-consuming loads with simulated loads, saving space costs and material costs.

[0031] (3) The back stage of the present invention has multiple energy processing methods, and can achieve energy saving through unity power factor grid connection and energy storage. It can also be used as a secondary DC power supply to reuse electric energy and save electric energy, thereby reducing electricity costs; at the same time, the back stage has a two-stage DC conversion circuit, which can adjust the DC bus voltage to a wider range, thus providing electric energy for more electrical appliances.

[0032] (4) The energy processing system of the present invention adopts a multi-stage circuit structure, each stage is relatively independent and can be controlled synchronously or independently, so that energy transmission is smoother, flexible and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The figure shows a schematic structural diagram of the electric vehicle test energy processing system of the present invention;

[0034] Figure 2 Shown is a schematic diagram of the circuit topology structure of the energy processing system of the present invention;

[0035] Figure 3 Shown is a schematic flow chart of the electric vehicle test energy processing method of the present invention. DETAILED DESCRIPTION

[0036] The technical scheme of the preferred embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] The present invention first provides an electric vehicle test energy processing system, which is mainly divided into a three-level structure: the front-stage subsystem is responsible for processing the energy of the input system, the middle stage is mainly responsible for voltage stabilization and filtering, and the rear-stage subsystem is mainly responsible for energy processing. Specifically, the system includes:

[0039] A front-stage subsystem, in which an AC-DC converter and / or a DC-DC converter is provided in its circuit for connecting the energy input of the test object; in a preferred embodiment, the front-stage subsystem is provided with a three-phase AC input interface and a DC input interface to adapt to the energy output mode of different test objects; to simplify the circuit layout, the front-stage subsystem adopts a first circuit unit that can realize DC-DC conversion, single-phase AC-DC conversion and three-phase AC-DC conversion by controlling circuit elements, and the first circuit unit is provided with an IGBT and an inductor element.

[0040] The intermediate subsystem has a DC bus capacitor in its circuit, which is used to stabilize and filter the electric energy preliminarily processed by the front-stage subsystem and then input it into the rear-stage subsystem; in a preferred embodiment, the intermediate subsystem has a DC bus capacitor, a pre-charge resistor and a pre-charge switch, and when pre-charging is required, a pre-charge circuit is formed by connecting the pre-charge switch to a line with a pre-charge resistor. The DC bus capacitor of the intermediate subsystem mainly isolates the front-stage subsystem and the rear-stage subsystem, realizes voltage stabilization and filtering, provides a stable power input for the rear-stage subsystem, improves the energy processing efficiency of the rear-stage subsystem, and can cooperate with the pre-charge resistor to have a pre-charge function.

[0041] The back-stage subsystem has a DC-AC inverter and / or a DC-DC converter in its circuit, which is used to output the stabilized and filtered electric energy. The way in which the back-stage subsystem outputs electric energy includes at least two of grid connection, energy storage, energy consumption and secondary power supply. In a preferred embodiment, the back-stage subsystem has a second circuit unit that can realize DC-AC inversion and DC-DC conversion, the second circuit unit has a bridge conversion circuit, and the back-stage subsystem has a DC output port and an AC output port. The main body of the back-stage subsystem of the present invention adopts the topological form of the bridge conversion circuit, and the circuit can be reused and switched with the switch. The main function of the back-stage subsystem is to realize four energy processing methods: 1. DC-AC conversion to connect electric energy to the grid with a high power factor; 2. DC-DC conversion can be realized to store electric energy in energy storage devices such as batteries and supercapacitors; 3. Through DC-DC conversion as a secondary DC power supply to provide electric energy for other electrical appliances; 4. Dissipate in the form of heat energy through energy-consuming components such as resistors.

[0042] Figure 2 In the embodiment shown, the first circuit unit of the front-stage subsystem has DC input interfaces DC1 and DC2 and three-phase AC input interfaces AC1, AC2 and AC3. The DC input line is provided with a switch tube SDC and an inductor L0, diodes VT1, VT2 and VT3, and a capacitor C1. The circuits corresponding to the three-phase AC input interfaces AC1, AC2 and AC3 are provided with a switch S1 and an inductor L1, a switch S2 and an inductor L2, and a switch S3 and an inductor L3, respectively. The three-phase AC input circuit is connected to six switch tubes SF1, SF2, SF3, SF4, SF5 and SF6 with reverse-connected diodes to form a three-phase bridge circuit.

[0043] The intermediate subsystem is provided with a pre-charge switch Sch, a pre-charge resistor Rch and a DC bus capacitor Cbus, wherein the pre-charge switch Sch is a selection switch, which can be switched to the bus position to directly connect to the bus or switched to the chg position to connect the pre-charge resistor Rch to form a pre-charge circuit according to system requirements.

[0044] The second circuit unit of the post-stage subsystem is provided with DC output ports DCO1 and DCO2, inductors L4 and L5 and an H-bridge circuit formed by connecting the inductors L4 and L5 and four switch tubes SR1, SR2, SR3 and SR4 with reverse-connected diodes, and selection switches Sgs1, Sgs2 and Sgs3 for grid connection or energy storage output. The circuit for energy storage output is provided with energy storage devices, supercapacitors SC and energy storage devices, batteries Batt.

[0045] Embodiment 2:

[0046] The present embodiment provides an electric vehicle test energy processing method, which connects the power input of the test organization through a front-stage subsystem, adjusts the circuit state according to the power output mode to control the output current and bus voltage of the test battery, so that the power input to the system is stabilized and filtered by the intermediate-stage subsystem and then outputted through the rear-stage subsystem.

[0047] Specifically, the method comprises the following steps:

[0048] Step S1: before the test starts, select a test object, and connect the test energy to the front-stage subsystem according to the corresponding input port connection based on the selected test object; for example, when testing a high-voltage battery or other DC power supply, connect the positive and negative electrodes of the high-voltage battery to the DC input interfaces DC1 and DC2 of the front-stage subsystem; when testing a motor controller, connect the three-phase ports of the motor controller to the three-phase AC input interfaces AC1, AC2 and AC3 of the front-stage subsystem respectively, and disconnect switches S1, S2 and S3; when the output shaft of the motor body drags the generator through the transmission mechanism and the mechanical load, connect the three-phase output end of the generator to the three-phase AC input interfaces AC1, AC2 and AC3 of the front-stage subsystem, and disconnect switches S1, S2 and S3; when the hub shaft drags the generator through the transmission mechanism and the mechanical load, connect the three-phase output end of the generator to the three-phase AC input interfaces AC1, AC2 and AC3 of the front-stage subsystem, and disconnect switches S1, S2 and S3;

[0049] Step S2: Determine whether to perform grid precharging, and complete the precharging of the system according to the determination result; specifically, when it is determined that the grid precharging mode is used, the selection switches Sgs1, Sgs2, and Sgs3 are switched to the grid gear to form a grid precharging circuit; when non-grid precharging is selected, the selection switches Sgs1, Sgs2, and Sgs3 are switched to the power reserve mode (save) gear to form a supercapacitor SC precharging circuit; after starting precharging, determine whether the DC bus voltage reaches the threshold, and enter the subsequent steps when the DC bus voltage reaches the threshold;

[0050] Step S3: At the beginning of the test, select an energy processing mode, and adjust the circuit state of the subsequent subsystem according to the selected energy processing mode: when the power grid is selected for power output, the selection switches Sgs1, Sgs2, and Sgs3 are switched to the grid (grid) gear; when energy storage is selected, the selection switches Sgs1, Sgs2, and Sgs3 are switched to the power reserve mode (save) gear; when the power output is selected to be completed by energy consumption, the switch Scn is closed, and the resistance value of the pre-charge resistor Rcn is adjusted, and the switch tubes R1, R2, R3, and R4 are not controlled; when it is selected as a secondary power supply, the selection switches Sgs1, Sgs2, and Sgs3 are switched to the (save) gear;

[0051] Step S4: adjusting the circuit states of the front-stage subsystem and the intermediate-stage subsystem according to the selected energy mode;

[0052] Step S5: When the test is finished, the bus capacitor Cbus is discharged using RCh.

[0053] For different test objects, the front-end subsystem in this method works differently, as follows:

[0054] When the test object is a motor controller / inverter, the three-phase input interface receives the power input of the tested motor inverter, and the front-end subsystem controls the current amplitude and phase difference of the three-phase AC input to simulate the load, while stably controlling the DC bus voltage to achieve stable power transmission;

[0055] When the test object is the drive motor body tested by the dynamometer, the three-phase input interface receives the power input of the dynamometer, controls the speed and current of the dynamometer through the front-end subsystem, obtains the electrical parameters of the dynamometer and the test object, and stably controls the bus voltage;

[0056] When the test object is the performance of the whole vehicle using a rotating hub test, the three-phase AC input interface receives the electric energy transmitted by the three-phase power supply of the generator, and the front-stage subsystem acts as the controller of the generator to provide resistance for the whole vehicle's rotating hub and stably controls the DC bus voltage;

[0057] When the test object is a DC device, the input current is controlled by the front-end subsystem to simulate the DC load and control the DC bus voltage.

[0058] Embodiment 3:

[0059] This embodiment takes high-voltage battery pack testing as an example to explain in detail the test energy processing method of the present invention.

[0060] 1. Connect the battery under test

[0061] The current power battery pack provides a DC power input of about 400V. Connect the positive pole of the tested battery pack to the DC port DC1, and the negative pole to the DC port DC2. SDC and VT1 form a discontinuous current control loop; close and only close one of the switches S1, S2, and S3. Assuming that S1 is closed, L0 and VT2, VT3, L1, SF1, and C1 form a double-tube cascade Boost circuit, which can realize the DC conversion function. The current tracking control method can control the current form of the battery pack output, including continuous current and discontinuous current, pulse current, specific waveform current, etc., and at the same time, the DC bus voltage can be stabilized at the desired working voltage platform.

[0062] 2. Pre-charge

[0063] Before the battery pre-test, the energy processing selection switches Sgs1~3 in the rear-stage subsystem are closed uniformly to the grid, and the rear stage is connected to the grid. The pre-charge selection switch is switched to chg. The pre-charge energy can come from the grid or the charged supercapacitor SC. When the grid pre-charge is selected, the switches Sgs1~3 are selected in the grid gear, and the rear-stage subsystem is in the rectifier converter working state, and the grid energy is rectified and transmitted to the intermediate stage for storage in the DC bus capacitor Cbus; when the supercapacitor pre-charge is selected, the switches Sgs1~3 are selected in the energy retention mode (save) gear, and the rear stage works in the boost working mode. Until the Cbus voltage, that is, the bus voltage, rises to the preset working voltage to ensure the normal operation of the front-stage converter. After the pre-charge is completed, the pre-charge selection switch SCh is switched to the bus gear.

[0064] 3. Start the test, the front-end subsystem controls the battery pack load

[0065] On the premise that the intermediate DC bus voltage reaches the boost platform corresponding to the high-voltage battery pack voltage, the desired output current or power is given according to the test requirements of the battery pack or the load simulation requirements, and the positive and negative currents of the high-voltage battery pack, i.e., the power output, are controlled through the current tracking control technology of the previous double-tube cascade Boost circuit and the DC-DC conversion circuit.

[0066] 4. Energy handling during testing

[0067] The present invention can select a variety of energy processing methods, which has a significant effect on saving test electricity.

[0068] When the energy is selected to be connected to the grid, the grid-connected storage switches Sgs1~Sgs3 are adjusted to the grid. At this time, the subsequent subsystem forms a single-phase full-bridge conversion circuit, the DC side is the intermediate DC bus, and the AC side is connected to the grid. On the premise that the DC side voltage meets the inverter grid conditions, the voltage amplitude and phase of the AC grid are sampled, and the four switch tubes SR1~SR4 are controlled in combination with the control technology of the full-bridge inverter circuit to achieve unity power factor grid connection after DC inverter. On the basis of achieving energy recovery, it helps to adjust the grid environment.

[0069] When the energy consumption treatment method is selected, the four switch tubes are not controlled, and the rear full-bridge circuit is in a disconnected state. The energy consumption switch SCn is closed, and the energy consumption resistor organization RCn is adjusted to continuously consume the energy on the bus within a safe range, and finally release it in the form of heat energy.

[0070] When the energy storage processing mode is selected, the grid-connected storage switches Sgs1~3 are switched to the energy retention mode (save). At this time, the four switch tubes and inductor devices of the rear-stage subsystem constitute a two-stage DC-DC conversion circuit. The first stage can be connected to the DC energy storage device supercapacitor to play the role of energy storage and voltage stabilization and filtering. The second stage can be connected to the energy storage battery to achieve the final storage of energy.

[0071] When the secondary DC power supply processing mode is selected, similar to the energy storage mode, the rear-stage DC output terminals DCO1 and DCO2 are connected to the two ends of the DC electrical appliances. For example, it can be used as a power supply to provide power for auxiliary test equipment such as DCDC, battery pack heating device, air conditioner, etc. The two-stage DC converter is used to adjust the DC bus voltage to the working voltage platform required by the electrical appliance to ensure the normal operation of the electrical appliance. The excess energy will continue to be stored in the DC bus capacitor and the supercapacitor of the rear-stage energy storage, or it needs to be consumed through an additional energy consumption circuit to prevent the capacitor from overcharging.

[0072] The two-stage DC conversion circuit can reduce the voltage platform to a lower level, thereby being compatible with energy storage batteries with a larger voltage range and DC electrical appliances with a larger operating voltage range.

[0073] 5. After the test, discharge.

[0074] In order to ensure the safety of the test equipment and prevent accidental electric shock, the charge stored in the intermediate DC bus capacitor needs to be discharged after the test is completed. The pre-charging circuit and the energy consumption circuit can be used to discharge it.

[0075] Embodiment 4:

[0076] Similar to Example 3, when testing the motor controller or the generator connected to the motor towing or the motor towing the whole vehicle hub, the three-phase AC output of the tested equipment is connected to the AC1, AC2, and AC3 AC input ports respectively, so as to convert the three-phase AC into DC using the three-phase full-bridge inverter circuit and its current tracking control method, and realize the control of the phase angle of each phase current to simulate the required load. If the object under test is in the form of single-phase AC, the output end is connected to any pair of ports among AC1, AC2, and AC3 to form a single-phase bridge rectifier circuit, and then the current control method is used to convert the AC into DC and transmit it to the intermediate and post-stage systems. Due to the use of a modular hierarchical structure, the intermediate DC bus capacitor and the post-stage energy processing method are relatively independent, and the working method is the same as the above-mentioned test DC high-voltage battery.

[0077] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention. The dimensions described in the drawings and embodiments are not related to the specific objects and are not used to limit the protection scope of the present invention. The dimensions of the objects can be selected and changed according to actual needs.

Claims

1. An electric vehicle test energy processing system, comprising: A front-stage subsystem, in which an AC-DC converter and / or a DC-DC converter is provided in its circuit for connecting the energy input of the test object; The intermediate subsystem has a DC bus capacitor in its circuit, which is used to stabilize and filter the electric energy preliminarily processed by the previous subsystem and then input it into the subsequent subsystem; The subsequent subsystem has a DC-AC inverter and / or a DC-DC converter in its circuit, which is used to output the stabilized and filtered electric energy.

2. The electric vehicle test energy processing system according to claim 1, characterized in that: The front-stage subsystem is provided with a three-phase AC input interface and a DC input interface; the front-stage subsystem has a first circuit unit capable of realizing DC-DC conversion, single-phase AC-DC conversion and three-phase AC-DC conversion, and the first circuit unit is provided with an IGBT and an inductor element.

3. The electric vehicle test energy processing system according to claim 2, characterized in that: The first circuit unit comprises a switch element, an inductor element, a diode, and a three-phase bridge circuit formed by connecting the switch element and six switch tubes with reverse-connected diodes.

4. An electric vehicle test energy processing system according to any one of claims 1 to 3, characterized in that: The power output mode of the latter subsystem includes at least two of the following: grid connection, energy storage, energy consumption and secondary power supply.

5. The electric vehicle test energy processing system according to claim 4, characterized in that: The latter subsystem has a second circuit unit capable of realizing DC-AC inversion and DC-DC conversion, the second circuit unit has a bridge conversion circuit, and the latter subsystem has a DC output port and an AC output port.

6. The electric vehicle test energy processing system according to claim 5, characterized in that: The second circuit unit is provided with an inductor element and an H-bridge circuit formed by connecting the inductor element and four switch tubes with reverse-connected diodes, a selection switch for grid connection or energy storage output, and a circuit for energy storage output is provided with an energy storage device supercapacitor and an energy storage device battery.

7. An electric vehicle test energy processing system according to any one of claims 1 to 5, characterized in that: The intermediate-level subsystem has a pre-charging circuit, and the pre-charging circuit is provided with a pre-charging switch and a pre-charging resistor.

8. An electric vehicle test energy processing method, characterized in that: The front-stage subsystem is connected to the power input of the test organization, and the circuit state is adjusted according to the power output mode to control the output current and bus voltage of the tested battery, so that the power input to the system is stabilized and filtered by the intermediate-stage subsystem and then output through the rear-stage subsystem.

9. The electric vehicle test energy processing method according to claim 8, characterized in that: When the test object is a motor controller / inverter, the three-phase input interface receives the power input of the tested motor inverter, and the front-end subsystem controls the current amplitude and phase difference of the three-phase AC input to simulate the load; When the test object is a drive motor body tested by a dynamometer, the three-phase input interface receives the power input of the dynamometer, controls the speed and current of the dynamometer through the front-end subsystem, and obtains the electrical parameters of the dynamometer and the test object; When the test object is the performance of the whole vehicle using a rotating hub test, the three-phase AC input interface receives the electric energy transmitted by the three-phase power supply of the generator, and the front-stage subsystem acts as the controller of the generator to provide resistance for the rotating hub of the whole vehicle; When the test object is a DC device, the input current is controlled by the front-end subsystem to simulate the DC load.

10. The electric vehicle test energy processing method according to claim 8, characterized in that: The method includes: Step S1: before the test starts, a test object is selected, and the test energy is input into the front-stage subsystem according to the corresponding input port connection of the selected test object; Step S2: Determine whether to pre-charge the power grid, and complete pre-charging the system according to the determination result; Step S3: When the test starts, an energy processing method is selected, and the circuit state of the subsequent subsystem is adjusted according to the selected energy processing method; Step S4: adjusting the circuit states of the front-stage subsystem and the intermediate-stage subsystem according to the selected energy processing method; Step S5: Discharge the bus capacitor when the test is completed.

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