阅读说明：本技术 一种车辆用永磁牵引系统试验装置及其控制方法 (Permanent magnet traction system test device for vehicle and control method thereof ) 是由 何亚屏 刘猛 梁金成 刘辉荣 付如愿 张文进 唐勋路 黄佳德 刘阳 邱欣 郭宁平 于 2020-04-02 设计创作，主要内容包括：本发明提供了一种车辆用永磁牵引系统试验装置及控制方法,该装置包括：至少三个试验平台,其与待试验的永磁牵引系统连接,用于配合所述永磁牵引系统模拟车辆的实际运行工况以实现所述系统的多种性能测试；其中,所述车辆的实际运行工况包括：柴油发动机组运行工况和车辆制动工况；各个试验平台均包括依次连接的电网电源、变流器、电机和扭矩仪。采用本发明的试验装置不仅能够基于地面试验条件,实现柴油发动机、永磁发电机与永磁牵引电机之间协同控制的试验,同时能够有效测试系统在各种突变工况下的稳定性与兼容性,克服了现有技术中试验项目覆盖不全面的问题,大大提升系统的可靠性,并降低了试验装置对能量的消耗,节省试验成本。(The invention provides a test device and a control method of a permanent magnet traction system for a vehicle, wherein the device comprises the following components: the system comprises at least three test platforms, a test platform and a control platform, wherein the test platforms are connected with a permanent magnet traction system to be tested and are used for matching with the permanent magnet traction system to simulate the actual operation condition of a vehicle so as to realize various performance tests of the system; wherein, the actual operating condition of vehicle includes: the method comprises the following steps of (1) operating conditions of a diesel engine set and vehicle braking conditions; each test platform comprises a power grid power supply, a converter, a motor and a torque meter which are connected in sequence. The testing device provided by the invention can realize the test of cooperative control among the diesel engine, the permanent magnet generator and the permanent magnet traction motor based on ground test conditions, can effectively test the stability and compatibility of the system under various sudden change working conditions, overcomes the problem of incomplete coverage of test items in the prior art, greatly improves the reliability of the system, reduces the energy consumption of the testing device and saves the testing cost.)

1. A permanent magnet traction system testing device for a vehicle, the device comprising:

the system comprises at least three test platforms, a test platform and a control platform, wherein the test platforms are connected with a permanent magnet traction system to be tested and are used for matching with the permanent magnet traction system to simulate the actual operation condition of a vehicle so as to realize various performance tests of the system;

wherein, the actual operating condition of vehicle includes: the method comprises the following steps of (1) operating conditions of a diesel engine set and vehicle braking conditions; each test platform comprises a power grid power supply, a converter, a motor and a torque meter which are connected in sequence.

2. The device of claim 1, wherein when the number of test platforms is 3, it is noted as a first test platform, a second test platform and a third test platform;

the first test platform is connected with a permanent magnet generator (9-1) of the permanent magnet traction system and used for providing mechanical energy for the electric permanent magnet generator (9-1) by utilizing electric energy from a first power grid power supply (4-1) of the first test platform;

the second test platform is connected with a left wheel permanent magnet traction motor (9-2) of the permanent magnet traction system and used for converting mechanical energy of the left wheel permanent magnet traction motor (9-2) into electric energy and feeding the electric energy back to a power grid;

and the third test platform is connected with a right wheel permanent magnet traction motor (9-3) of the permanent magnet traction system and is used for converting the mechanical energy of the right wheel permanent magnet traction motor (9-3) into electric energy and feeding the electric energy back to the power grid.

3. The apparatus of claim 1 or 2, wherein in the first test platform:

a first converter (5-1) and a first motor (6-1) of the system run cooperatively, and an electric energy permanent magnet generator (9-1) of a permanent magnet traction system is driven to run by utilizing mechanical energy generated by electric energy provided by a first power grid power supply (4-1);

a first torque meter (7-1) is connected between a first motor (6-1) and a permanent magnet generator (9-1) and used for measuring torque between a first test platform and the permanent magnet generator (9-1).

4. The device according to claim 1 or 2, characterized in that in the second test platform, a second converter (5-2) and a second motor (6-2) thereof operate cooperatively to convert mechanical energy generated by the operation of a left wheel permanent magnet traction motor (9-2) of the permanent magnet traction system into alternating current, and the recovery of electric energy is realized through a second grid power supply (4-2);

a second torque meter (7-2) is connected between a second motor (6-2) and the left wheel permanent magnet traction motor (9-2) and used for measuring torque between a second test platform and the left wheel permanent magnet traction motor (9-2).

5. The device according to claim 1 or 2, characterized in that in the third test platform, a third converter (5-3) and a third motor (6-3) thereof operate cooperatively to convert mechanical energy generated by the operation of a right-wheel permanent magnet traction motor (9-3) of the permanent magnet traction system into alternating current, and the recovery of electric energy is realized through a third power grid power supply (4-3);

a third torque meter (7-3) is connected between a third motor (6-3) and a right wheel permanent magnet traction motor (9-3) and used for measuring torque between a third test platform and the right wheel permanent magnet traction motor (9-3).

6. A control method applied to the permanent magnet traction system test device for the vehicle of any one of claims 1 to 5, characterized by comprising the following steps:

controlling a plurality of test platforms to run in cooperation with a permanent magnet traction system to be tested, and simulating the running working condition of a diesel engine set of a vehicle to realize corresponding performance test;

and controlling the plurality of test platforms to run in cooperation with the permanent magnet traction system to be tested, and simulating the braking working condition of the vehicle to realize corresponding performance test.

7. The method of claim 6, wherein simulating the operating condition of the diesel engine set of the vehicle to achieve the corresponding performance test comprises:

adjusting the output frequency of a first converter (5-1) in a first test platform, driving a permanent magnet generator (9-1) to rotate, controlling the real-time rotating speed of a first motor (6-1) and adjusting the rotating speed change rate of the permanent magnet generator (9-1);

and (3) enabling the permanent magnet generator (9-1) to be in no-load, testing internal voltage and current parameters of the traction converter (10), and evaluating and determining the stability of the no-load system.

8. The method of claim 6 or 7, wherein in the process of simulating the operating condition of the diesel engine set of the vehicle to realize the corresponding performance test, the method further comprises the following steps:

adjusting the torque which is issued by a traction converter (10) in a permanent magnet traction system to a left wheel permanent magnet traction motor (9-2) and a right wheel permanent magnet traction motor (9-3) to adjust the load change of a permanent magnet generator (9-1), and testing the output characteristic of a diesel engine set and the system stability of the diesel engine set under the working condition according to the load parameter of the permanent magnet generator (9-1);

the traction converter (10) and the first converter (5-1) are communicated in real time through a CAN (controller area network) to match the output torque of the left wheel permanent magnet traction motor (9-2) and the right wheel permanent magnet traction motor (9-3) with the output characteristics of the permanent magnet generator (9-1), and the output capacity of the permanent magnet generator (9-1), the output torque of the left wheel permanent magnet traction motor (9-2) and the output torque of the right wheel permanent magnet traction motor (9-3) and the power of the left wheel permanent magnet traction motor (9-2) and the right wheel permanent magnet traction motor (9-3) are cooperatively controlled.

9. The method of claim 6, wherein the corresponding performance test is achieved by simulating a braking condition of the vehicle by:

different braking torques are issued to the permanent magnet traction motors (9-2 and 9-3) through the traction converter (10), so that the permanent magnet traction motors (9-2 and 9-3) are in a power generation working condition, and energy is consumed by the braking resistor (11);

controlling the traction converter (10) to issue different braking torques by adjusting the rotating speed of a first motor in a first test platform, and measuring the power consumption spectrum of a braking resistor (11) under different braking powers;

when the permanent magnet generator (9-1) is still in a power generation state due to inertia, the energy flow of a permanent magnet traction system and the consumed power spectrum of the brake resistor (11) at the moment are tested, and the stability of the system under the braking working condition is tested.

10. The method of claim 6, wherein the method further comprises:

testing the stability of the traction converter (10) under the fluctuation of loads and power supplies by controlling the sudden change of the load of the permanent magnet traction motors (9-2 and 9-3) or the sudden change of the rotating speed of the permanent magnet generator (9-1), and further obtaining the stability data of the tested permanent magnet traction system and the test result of the system limit working condition;

controlling the load sudden change of the permanent magnet traction motors (9-2 and 9-3), and testing and determining the following performance of the output characteristic of the permanent magnet generator (9-1);

the compatibility of the tested traction system to diesel engines with different external characteristics is tested and determined by adjusting the output frequency of the first converter (5-1) to control the rotation speed change of the permanent magnet generator (9-1).

11. The method of claim 6, wherein the method further comprises:

the first motor (6-1) is driven by the first converter (5-1) to rotate to transfer mechanical energy to the permanent magnet generator (9-1), the left wheel permanent magnet traction motor (9-2) and the right wheel permanent magnet traction motor (9-3) are driven by the traction converter (10) to transfer mechanical energy to the second motor (6-2) of the second test platform and the third motor (6-3) of the third test platform respectively, and then alternating current is output by the second converter (5-2) and the third converter (5-3) and fed back to the second power grid power supply (4-2) and the third power grid power supply (4-3) respectively, so that energy recovery is realized.

Technical Field

The invention relates to the technical field of reliability test and evaluation, in particular to a permanent magnet traction system test device for a vehicle and a control method thereof.

Background

In practical application, for vehicles with different specifications, the traction principle for realizing normal operation is different, the small vehicle is mechanically connected with the driving wheel due to small power and torque, kinetic energy generated by the engine is attached through the clutch, and power is transmitted to the driving wheel through the transmission ratio corresponding to different gears of the gearbox, so that the traction of the vehicle is realized. However, in large vehicles, particularly large engineering vehicles such as mining dump trucks, the power of a traction motor reaches megawatt, and the traction torque exceeds tens of thousands of newton meters and is dozens of times larger than that of passenger vehicles, so that components such as a hydraulic torque converter, a transmission, a drive axle and the like become limiting bottlenecks in the aspects of technology, materials, process and the like, and further the development of electric transmission in a large-power and large-torque vehicle traction system is influenced.

The existing traction system ground system test in the related field is mostly built based on an asynchronous traction system, and the asynchronous traction system is more a drag test of a tested converter and a traction motor during the system test, only the traction converter and the traction motor are examined, the tests such as the traction braking characteristic of the traction motor, the motor stalling characteristic and the speed scanning of the motor under the control of the converter under full torque are mainly examined, the performance of the traction motor is examined only by bias, the matching of the traction motor and the converter cannot be carried out on the whole system of a generator, the traction converter and the traction motor, and the stability, the reliability, the power response following performance and the like of the whole system cannot be tested.

Disclosure of Invention

To solve the above problems, the present invention provides a permanent magnet traction system testing apparatus for a vehicle, which in one embodiment comprises:

the system comprises at least three test platforms, a test platform and a control platform, wherein the test platforms are connected with a permanent magnet traction system to be tested and are used for matching with the permanent magnet traction system to simulate the actual operation condition of a vehicle so as to realize various performance tests of the system;

wherein, the actual operating condition of vehicle includes: the method comprises the following steps of (1) operating conditions of a diesel engine set and vehicle braking conditions; each test platform comprises a power grid power supply, a converter, a motor and a torque meter which are connected in sequence.

In one embodiment, when the number of the test platforms is 3, the test platforms are marked as a first test platform, a second test platform and a third test platform;

the first test platform is connected with a permanent magnet generator (9-1) of the permanent magnet traction system and used for providing mechanical energy for the electric permanent magnet generator (9-1) by utilizing electric energy from a first power grid power supply (4-1) of the first test platform;

the second test platform is connected with a left wheel permanent magnet traction motor (9-2) of the permanent magnet traction system and used for converting mechanical energy of the left wheel permanent magnet traction motor (9-2) into electric energy and feeding the electric energy back to a power grid;

and the third test platform is connected with a right wheel permanent magnet traction motor (9-3) of the permanent magnet traction system and is used for converting the mechanical energy of the right wheel permanent magnet traction motor (9-3) into electric energy and feeding the electric energy back to the power grid.

In one embodiment, the first test platform comprises:

a first converter (5-1) and a first motor (6-1) of the system run cooperatively, and an electric energy permanent magnet generator (9-1) of a permanent magnet traction system is driven to run by utilizing mechanical energy generated by electric energy provided by a first power grid power supply (4-1);

a first torque meter (7-1) is connected between a first motor (6-1) and a permanent magnet generator (9-1) and used for measuring torque between a first test platform and the permanent magnet generator (9-1).

In one embodiment, in the second test platform, a second converter (5-2) and a second motor (6-2) of the second test platform operate cooperatively to convert mechanical energy generated by the operation of a left wheel permanent magnet traction motor (9-2) of a permanent magnet traction system into alternating current, and electric energy recovery is realized through a second power grid power supply (4-2);

a second torque meter (7-2) is connected between a second motor (6-2) and the left wheel permanent magnet traction motor (9-2) and used for measuring torque between a second test platform and the left wheel permanent magnet traction motor (9-2).

In one embodiment, in the third test platform, a third converter (5-3) and a third motor (6-3) of the third test platform operate cooperatively, mechanical energy generated by operation of a right wheel permanent magnet traction motor (9-3) of a permanent magnet traction system is converted into alternating current, and electric energy recovery is realized through a third power grid power supply (4-3);

a third torque meter (7-3) is connected between a third motor (6-3) and a right wheel permanent magnet traction motor (9-3) and used for measuring torque between a third test platform and the right wheel permanent magnet traction motor (9-3).

In accordance with another aspect of any one or more embodiments, the present invention further provides a method for controlling a vehicle permanent magnet traction system testing apparatus, the method including:

controlling a plurality of test platforms to run in cooperation with a permanent magnet traction system to be tested, and simulating the running working condition of a diesel engine set of a vehicle to realize corresponding performance test;

and controlling the plurality of test platforms to run in cooperation with the permanent magnet traction system to be tested, and simulating the braking working condition of the vehicle to realize corresponding performance test.

In one embodiment, the process of simulating the operation condition of the diesel engine set of the vehicle to realize the corresponding performance test comprises the following steps:

adjusting the output frequency of a first converter (5-1) in a first test platform, driving a permanent magnet generator (9-1) to rotate, controlling the real-time rotating speed of a first motor (6-1) and adjusting the rotating speed change rate of the permanent magnet generator (9-1);

and (3) enabling the permanent magnet generator (9-1) to be in no-load, testing internal voltage and current parameters of the traction converter (10), and evaluating and determining the stability of the no-load system.

In one embodiment, in the process of simulating the operating condition of the diesel engine set of the vehicle to realize the corresponding performance test, the method further comprises the following steps:

adjusting the torque which is issued by a traction converter (10) in a permanent magnet traction system to a left wheel permanent magnet traction motor (9-2) and a right wheel permanent magnet traction motor (9-3) to adjust the load change of a permanent magnet generator (9-1), and testing the output characteristic of a diesel engine set and the system stability of the diesel engine set under the working condition according to the load parameter of the permanent magnet generator (9-1);

the traction converter (10) and the first converter (5-1) are communicated in real time through a CAN (controller area network) to match the output torque of the left wheel permanent magnet traction motor (9-2) and the right wheel permanent magnet traction motor (9-3) with the output characteristics of the permanent magnet generator (9-1), and the output capacity of the permanent magnet generator (9-1), the output torque of the left wheel permanent magnet traction motor (9-2) and the output torque of the right wheel permanent magnet traction motor (9-3) and the power of the left wheel permanent magnet traction motor (9-2) and the right wheel permanent magnet traction motor (9-3) are cooperatively controlled.

In one embodiment, the corresponding performance test is achieved by simulating the braking condition of the vehicle by:

different braking torques are issued to the permanent magnet traction motors (9-2 and 9-3) through the traction converter (10), so that the permanent magnet traction motors (9-2 and 9-3) are in a power generation working condition, and energy is consumed by the braking resistor (11);

controlling the traction converter (10) to issue different braking torques by adjusting the rotating speed of a first motor in a first test platform, and measuring the power consumption spectrum of a braking resistor (11) under different braking powers;

when the permanent magnet generator (9-1) is still in a power generation state due to inertia, the energy flow of a permanent magnet traction system and the consumed power spectrum of the brake resistor (11) at the moment are tested, and the stability of the system under the braking working condition is tested.

In one embodiment, the method further comprises:

testing the stability of the traction converter (10) under the fluctuation of loads and power supplies by controlling the sudden change of the load of the permanent magnet traction motors (9-2 and 9-3) or the sudden change of the rotating speed of the permanent magnet generator (9-1), and further obtaining the stability data of the tested permanent magnet traction system and the test result of the system limit working condition;

controlling the load sudden change of the permanent magnet traction motors (9-2 and 9-3), and testing and determining the following performance of the output characteristic of the permanent magnet generator (9-1);

the compatibility of the tested traction system to diesel engines with different external characteristics is tested and determined by adjusting the output frequency of the first converter (5-1) to control the rotation speed change of the permanent magnet generator (9-1).

In one embodiment, the method further comprises:

the first motor (6-1) is driven by the first converter (5-1) to rotate to transfer mechanical energy to the permanent magnet generator (9-1), the left wheel permanent magnet traction motor (9-2) and the right wheel permanent magnet traction motor (9-3) are driven by the traction converter (10) to transfer mechanical energy to the second motor (6-2) of the second test platform and the third motor (6-3) of the third test platform respectively, and then alternating current is output by the second converter (5-2) and the third converter (5-3) and fed back to the second power grid power supply (4-2) and the third power grid power supply (4-3) respectively, so that energy recovery is realized.

Compared with the closest prior art, the invention also has the following beneficial effects:

the invention provides a test device and a control method of a permanent magnet traction system for a vehicle, which are provided with three test platforms connected with the permanent magnet traction system to be tested and used for simulating the actual operation working condition of the vehicle by matching with the permanent magnet traction system so as to realize various performance tests of the system; each test platform comprises a power grid power supply, a converter, a motor and a torque meter which are connected in sequence. The test scheme provided by the invention can realize the test of cooperative control among the diesel engine, the permanent magnet generator and the permanent magnet traction motor based on ground test conditions, can effectively test the stability and compatibility of the system under various sudden change working conditions, overcomes the problem of incomplete coverage of test items in the prior art, greatly improves the reliability of the system on the premise of effectively ensuring the test efficiency, and can realize energy recovery based on the permanent magnet traction motor and a test bed during normal test, thereby reducing the energy consumption of the test device to a certain extent, saving the test cost and being beneficial to the optimization and development of the reliability test technology.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of an operating principle of an existing asynchronous traction system for a vehicle according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a permanent magnet traction system testing apparatus for a vehicle according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart of a control method of a permanent magnet traction system testing device for a vehicle according to another embodiment of the present invention;

fig. 4 is a schematic diagram of the change rate of the rise and the fall of the engine speed of the control method of the permanent magnet traction system test device for the vehicle in the embodiment of the invention.

Detailed Description

The following detailed description will be provided for the embodiments of the present invention with reference to the accompanying drawings and examples, so that the practitioner of the present invention can fully understand how to apply the technical means to solve the technical problems, achieve the technical effects, and implement the present invention according to the implementation procedures. It should be noted that, unless otherwise conflicting, the embodiments and features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are all within the scope of the present invention.

In practical application, for vehicles with different specifications, the traction principle for realizing normal operation is different, the small vehicle is mechanically connected with the driving wheel due to small power and torque, kinetic energy generated by the engine is attached through the clutch, and power is transmitted to the driving wheel through the transmission ratio corresponding to different gears of the gearbox, so that the traction of the vehicle is realized. However, in large vehicles, particularly large engineering vehicles such as mining dump trucks, the power of a traction motor of the large vehicle reaches megawatt level, and the traction torque exceeds tens of thousands of Nm, which is dozens of times larger than that of passenger vehicles, so that parts such as a hydraulic torque converter, a transmission, a drive axle and the like become limiting bottlenecks in the aspects of technology, materials, process and the like, and further the development of electric transmission in a large-power and large-torque vehicle traction system is influenced; the mining dump truck is a large-scale or ultra-large-scale vehicle adopting a diesel engine as a power source, and has two transmission modes of mechanical transmission and electric transmission, the existing electric transmission mining dump truck mainly takes an asynchronous traction system as a main transmission mode, and a permanent magnet traction system is blank in the industry.

The existing traction system ground system test in the related field is mostly built based on an asynchronous traction system, and the asynchronous traction system is more a drag test of a tested converter and a traction motor during the system test, only the traction converter and the traction motor are examined, the tests such as the traction braking characteristic of the traction motor, the motor stalling characteristic and the speed scanning of the motor under the control of the converter under full torque are mainly examined, the performance of the traction motor is examined only by bias, the matching of the traction motor and the converter cannot be carried out on the whole system of a generator, the traction converter and the traction motor, and the stability, the reliability, the power response following performance and the like of the whole system cannot be tested.

In practical application, the small vehicle is mechanically connected with the driving wheel due to small power and torque, kinetic energy generated by the engine is attached through the clutch, and the kinetic energy is transmitted to the driving wheel through the transmission ratios corresponding to different gears of the gearbox, so that traction of the vehicle is realized. However, in large vehicles, particularly large engineering vehicles such as mining dump trucks, the power of a traction motor reaches megawatt level, and the traction torque exceeds tens of thousands of Nm, which is tens of times larger than that of passenger vehicles, so that parts such as a hydraulic torque converter, a transmission, a drive axle and the like become limiting bottlenecks in the aspects of technology, materials, process and the like, and the development of electric transmission in a large-power and large-torque vehicle traction system is influenced. The scheme of the invention mainly researches the application of the permanent magnet traction system in a high-power traction vehicle, and is focused on researching a ground test device and a method of the permanent magnet traction system so as to fully complete the performance test of the permanent magnet traction system and ensure the reliability of the permanent magnet traction system.

As shown in fig. 1, in a high-power electric transmission traction system for a vehicle, an asynchronous traction system drives a synchronous generator 2 to output three-phase alternating current by a diesel engine 1, the three-phase alternating current is converted into a variable-frequency variable-voltage power supply by a traction converter 3, traction torque is synchronously transmitted to a left wheel traction motor 4 and a right wheel traction motor 5, and the corresponding motors are driven to rotate, so that traction of the vehicle is realized. When the vehicle is braked under the working condition, the traction converter 3 issues braking torque to the left wheel traction motor 4 and the right wheel traction motor 5, so that the left wheel traction motor and the right wheel traction motor work in a power generation state and are dissipated through the braking resistor 6, and the vehicle braking is realized. Specifically, the functional parameters of each structure in the asynchronous traction system are shown in the following table:

functional parameter table for asynchronous traction system component

The permanent magnet traction system is a new generation of traction system following the asynchronous traction system, has the advantages of high efficiency, high power density, high power factor, strong environmental adaptability and the like, and plays a significant role in the fields of energy conservation, noise reduction and the like. However, the application cases of the permanent magnet traction system in a high-power electric transmission system are few, and no mature test device and method are formed, so that the system performance cannot be checked. And when the asynchronous traction system is subjected to system test, more tests are performed on the traction of a tested converter and a traction motor, the aim is mainly to test the traction braking characteristic, the motor stalling characteristic, the speed scanning of the motor under full torque and the like, the performance of the traction motor is only heavily checked, and the overall performance of the whole traction system cannot be simulated due to the matching of the traction motor and the converter. The test device provided by the invention can simulate the overall performance of the whole traction system based on a high-power permanent magnet traction system, can be well suitable for a two-wheel drive traction system powered by a diesel generator set, can be used for examining various performances of a traction converter and a traction motor, can effectively examine the performances of the permanent magnet traction system under different working conditions or limit conditions, overcomes the problem of incomplete test item of the conventional traction system ground test device, greatly reduces the energy consumption of the test device, and reduces the test cost.

It should be noted that, for a permanent magnet traction system for a vehicle using a permanent magnet generator and a permanent magnet traction motor, how to perform a system performance test in a ground test is to ensure that various performance indexes of the system meet requirements before loading, and the success of the ground test directly relates to the performance of the traction system after loading. The invention is intended to protect a whole set of test apparatus and test method, and various embodiments of the invention are described below with reference to the accompanying drawings.

Example one

Fig. 2 shows a schematic structural diagram of a testing apparatus for a permanent magnet traction system for a vehicle according to a first embodiment of the present invention, and as can be seen from fig. 2, the testing apparatus includes:

the system comprises at least three test platforms, a permanent magnet traction system and a control system, wherein the test platforms are connected with the permanent magnet traction system to be tested and used for matching with the permanent magnet traction system to simulate the actual operation working condition of a vehicle so as to realize various performance tests of the system;

wherein, the actual operating condition of vehicle includes: the method comprises the following steps of (1) operating conditions of a diesel engine set and vehicle braking conditions; each test platform comprises a power grid power supply, a converter, a motor and a torque meter which are connected in sequence.

In one embodiment, when the number of the test platforms is 3, the test platforms are marked as a first test platform, a second test platform and a third test platform;

the first test platform is connected with a permanent magnet generator (9-1) of the permanent magnet traction system and used for providing mechanical energy for the electric permanent magnet generator (9-1) by utilizing electric energy from a first power grid power supply (4-1) of the first test platform;

the second test platform is connected with a left wheel permanent magnet traction motor (9-2) of the permanent magnet traction system and used for converting mechanical energy of the left wheel permanent magnet traction motor (9-2) into electric energy and feeding the electric energy back to a power grid;

and the third test platform is connected with a right wheel permanent magnet traction motor (9-3) of the permanent magnet traction system and is used for converting the mechanical energy of the right wheel permanent magnet traction motor (9-3) into electric energy and feeding the electric energy back to the power grid.

As can be seen by analysis in combination with fig. 2, the device mainly comprises a tested traction system (8) and test accompanying tables (1, 2 and 3), wherein the tested traction system (8) comprises a permanent magnet generator (9-1), a traction converter (10), a left wheel traction motor (9-2), a right wheel traction motor (9-3) and a brake resistor (11). The accompanying test device consists of a first test bed (1), a second test bed (2) and a third test bed (3). The test bed is composed of a power grid power supply, a test accompanying converter, a test accompanying motor, a torque meter and the like, generally, a permanent magnet generator is a synchronous generator which generates a synchronous rotating magnetic field through permanent magnet excitation, the permanent magnet serves as a rotor to generate the rotating magnetic field, and a three-phase stator winding generates three-phase symmetrical current under the action of the rotating magnetic field. The functions of the test apparatus relating to the respective members are described in the following table.

Function description table of each part of test device

Further, in the first test platform:

a first converter (5-1) and a first motor (6-1) of the system run cooperatively, and an electric energy permanent magnet generator (9-1) of a permanent magnet traction system is driven to run by utilizing mechanical energy generated by electric energy provided by a first power grid power supply (4-1);

a first torque meter (7-1) is connected between a first motor (6-1) and a permanent magnet generator (9-1) and used for measuring torque between a first test platform and the permanent magnet generator (9-1).

In the second test platform, a second converter (5-2) and a second motor (6-2) of the second test platform operate cooperatively, mechanical energy generated by the operation of a left wheel permanent magnet traction motor (9-2) of a permanent magnet traction system is converted into alternating current, and electric energy recovery is realized through a second power grid power supply (4-2);

a second torque meter (7-2) is connected between a second motor (6-2) and the left wheel permanent magnet traction motor (9-2) and used for measuring torque between the second test platform and the left wheel permanent magnet traction motor (9-2).

In a third test platform, a third converter (5-3) and a third motor (6-3) of the third test platform operate cooperatively, mechanical energy generated by the operation of a right wheel permanent magnet traction motor (9-3) of a permanent magnet traction system is converted into alternating current, and electric energy recovery is realized through a third power grid power supply (4-3);

a third torque meter (7-3) is connected between a third motor (6-3) and the right wheel permanent magnet traction motor (9-3) and used for measuring torque between the third test platform and the right wheel permanent magnet traction motor (9-3).

In a preferred embodiment, in order to realize sufficient test verification and examination of the permanent magnet traction system, the scheme is used for realizing one-to-one capacity and full-size test simulation, the first test bed (1) simulates the actual working condition of a diesel engine, the device capacity of the first test bed (1) is designed according to 3MW, and the maximum design torque is designed according to 20,000 N.m. The second test bed (2) and the third test bed (3) are used for examining the external characteristics of the traction motor, the device capacity is designed according to 1.5MW, and the maximum design torque is designed according to 40,000 N.m.

The test device realizes the electric energy source of the tested traction system (8) and the electric network (4-1), and in the performance test process of the tested traction system (8), the mechanical energy of the tested permanent magnet traction motors (9-2 and 9-3) is converted into electric energy through the second test bed (2) and the third test bed (3) and fed back to the electric network (4-2 and 4-3), so that the minimum consumption of the energy in the test process is realized, and the test cost is reduced.

In the permanent magnet traction system test device for the vehicle provided by the embodiment of the invention, each module or unit structure can independently operate or operate in a combined mode according to test requirements so as to realize corresponding technical effects.

Example two

Fig. 3 is a schematic flow chart illustrating a control method of the testing apparatus for a permanent magnet traction system for a vehicle according to an embodiment of the present invention, where the control method is applied to any one or more of the above-mentioned implemented permanent magnet traction systems for a vehicle, and as shown in fig. 3, the method includes:

and controlling the plurality of test platforms to run in cooperation with the permanent magnet traction system to be tested, and simulating the running working condition of a diesel engine set of the vehicle to realize corresponding performance test.

In one embodiment, the process of simulating the operation condition of the diesel engine set of the vehicle to realize the corresponding performance test comprises the following steps:

adjusting the output frequency of a first converter (5-1) in a first test platform, driving a permanent magnet generator (9-1) to rotate, controlling the real-time rotating speed of a first motor (6-1) and adjusting the rotating speed change rate of the permanent magnet generator (9-1);

and (3) enabling the permanent magnet generator (9-1) to be in no-load, testing internal voltage and current parameters of the traction converter (10), and evaluating and determining the stability of the no-load system.

Adjusting the torque which is issued by a traction converter (10) in a permanent magnet traction system to a left wheel permanent magnet traction motor (9-2) and a right wheel permanent magnet traction motor (9-3) to adjust the load change of a permanent magnet generator (9-1), and testing the output characteristic of a diesel engine set and the system stability of the diesel engine set under the working condition according to the load parameter of the permanent magnet generator (9-1);

in practical application, a first converter (5-1), a second converter (5-2) and a third converter (5-3) are used as test-accompanying converters, a first motor (6-1), a second motor (6-2) and a third motor (6-3) are used as test-accompanying motors, and a tested permanent magnet generator (9-1), a left wheel permanent magnet traction motor (9-2) and a right wheel permanent magnet traction motor (9-3) are used as tested motors. The external characteristics of the rotating speed and the torque of the diesel engine are simulated through the first test bed (1), the relation between an engine throttle signal and the rotating speed of the diesel engine under the actual running working condition of a vehicle is simulated, the output frequency of the accompanying test converter (5-1) is adjusted, and then the tested permanent magnet generator (9-1) is driven to rotate. The change rate of the rotating speed of the tested permanent magnet generator (9-1) is adjusted by controlling the real-time rotating speed of the accompanying motor (6-1), the change rate of the rising and falling of the rotating speed of the diesel engine is adjusted according to the change rate of the rising and falling of the rotating speed of the diesel engine of a specific project, the change rate of the rising and falling of the rotating speed of the diesel engine is shown in figure 4, wherein the abscissa represents the time parameter of the measuring process and is in units of seconds, and the ordinate represents the rotating speed of the tested diesel engine and is in units of rpm (revolutions per minute).

When the permanent magnet generator (9-1) is tested to be in no-load, the voltage and current parameters in the traction converter (10) are evaluated, and the stability of a no-load system is evaluated.

Load change of the permanent magnet generator (9-1) is adjusted by adjusting torque transmitted by the traction converter (10) to the left wheel permanent magnet traction motor (9-2) and the right wheel permanent magnet traction motor (9-3), and output characteristics and system stability of the diesel generator set at the moment are tested.

The traction converter (10) and the first converter (5-1) are communicated in real time through a CAN (controller area network) to match the output torque of the left wheel permanent magnet traction motor (9-2) and the right wheel permanent magnet traction motor (9-3) with the output characteristics of the permanent magnet generator (9-1), and the output capacity of the permanent magnet generator (9-1), the output torque of the left wheel permanent magnet traction motor (9-2) and the output torque and power of the right wheel permanent magnet traction motor (9-3) are cooperatively controlled.

The actual working condition of the vehicle is combined, and the torque is independently transmitted to the left wheel tested motor (9-2) and the right wheel tested motor (9-3) through the accompanying test converter (10) so as to simulate the actual running working condition of the whole vehicle. The tested converter (10) and the auxiliary converter (5-1) are communicated in real time through the CAN to match the output torque of the tested motors (9-2 and 9-3) and the output characteristic of the permanent magnet generator (9-1), and the output capacity of the tested permanent magnet generator (9-1) and the output torque and power of the tested traction motors (9-2 and 9-3) are cooperatively controlled.

Considering that the actual operating conditions of the vehicle include not only the diesel engine set operating conditions but also the vehicle braking conditions, the method further comprises:

and controlling the plurality of test platforms to run in cooperation with the permanent magnet traction system to be tested, and simulating the braking working condition of the vehicle to realize corresponding performance test.

Further, the corresponding performance test is realized by simulating the braking condition of the vehicle through the following operations:

different braking torques are issued to the permanent magnet traction motors (9-2 and 9-3) through the traction converter (10), so that the permanent magnet traction motors (9-2 and 9-3) are in a power generation working condition, and energy is consumed by the braking resistor (11);

controlling a traction converter (10) to issue different braking torques by adjusting the rotating speed of a first motor in a first test platform, and measuring the power consumption spectrum of a braking resistor (11) under different braking powers;

when the permanent magnet generator (9-1) is still in a power generation state due to inertia, the energy flow of a permanent magnet traction system and the consumed power spectrum of the brake resistor (11) at the moment are tested, and the stability of the system under the braking working condition is tested.

In practical application, when a vehicle is braked under the working condition, different braking torques are issued to the tested permanent magnet traction motors (9-2 and 9-3) through the tested traction converter (10), so that the tested permanent magnet traction motors (9-2 and 9-3) are in a power generation state, and braking energy is consumed by the braking resistor (11). The tested traction converter (10) issues different braking torques to test the consumed power spectrum of the braking resistor (11) of the vehicle under different braking powers, and the economic analysis of the braking energy feedback of the traction system is further tested. Under the test braking condition, when the permanent magnet generator is still in a power generation state due to inertia, the energy flow of the tested permanent magnet traction system (8) is tested, and the consumed power spectrum of the brake resistor (11) is tested at the moment, so that the stability of the system is tested.

Based on the setting of the test device of the invention, the method may further comprise:

testing the stability of the traction converter (10) under the fluctuation of loads and power supplies by controlling the sudden change of the load of the permanent magnet traction motors (9-2 and 9-3) or the sudden change of the rotating speed of the permanent magnet generator (9-1), and further obtaining the stability data of the tested permanent magnet traction system and the test result of the system limit working condition;

controlling the load sudden change of the permanent magnet traction motors (9-2 and 9-3), and testing and determining the following performance of the output characteristic of the permanent magnet generator (9-1);

the compatibility of the tested traction system to diesel engines with different external characteristics is tested and determined by adjusting the output frequency of the first converter (5-1) to control the rotation speed change of the permanent magnet generator (9-1).

In combination with practical application, the performance of the tested traction converter (10) is closely related to the stability of the tested traction system (8) as the only device with the control function of the tested traction system (8). In the scheme, the voltage and current stability of the traction converter (10) under the fluctuation of loads and power supplies is tested by controlling the sudden change of the loads of the tested traction motors (9-2 and 9-3) and the sudden change of the rotating speed of the tested generator (9-1), so that the stability of the tested traction system (8) is tested, and the end-to-end test of the system limit working condition is completed. Meanwhile, the follow-up performance of the output characteristic of the tested permanent magnet generator (9-1) is tested by controlling the load sudden change of the tested traction motors (9-2 and 9-3), the rotating speed change of the tested permanent magnet generator (9-1) is realized by adjusting the output frequency of the accompanying converter (5-1), and the compatibility of the tested traction system (8) to diesel engines with different external characteristics is further tested.

Based on the test method, the performance of the core components and the system in the permanent magnet traction system under different running conditions and different control parameters of the vehicle can be tested, and in addition, the scheme provided by the invention can also effectively realize energy recovery. Specifically, the control method provided by the invention further comprises the following steps:

the first motor (6-1) is driven by the first converter (5-1) to rotate to transfer mechanical energy to the permanent magnet generator (9-1), the left wheel permanent magnet traction motor (9-2) and the right wheel permanent magnet traction motor (9-3) are driven by the traction converter (10) to transfer mechanical energy to the second motor (6-2) of the second test platform and the third motor (6-3) of the third test platform respectively, and then alternating current is output by the second converter (5-2) and the third converter (5-3) and fed back to the second power grid power supply (4-2) and the third power grid power supply (4-3) respectively, so that energy recovery is realized.

In practical application, when a tested traction system (8) is in joint debugging, a power grid power supply (4-1) of a first test bed (1) provides electric energy, an accompanying motor (6-1) is driven to rotate through an accompanying converter (5-1), and mechanical energy is transmitted to a tested generator (9-1). The tested motors (9-2 and 9-3) are driven by the tested converter (10), mechanical energy is transmitted to the test-accompanying motors (6-2 and 6-3), three-phase alternating current is output by the test-accompanying converters (5-2 and 5-3) and fed back to the power grids (4-2 and 4-3), and energy recycling is achieved. Taking the scheme as an example, in order to verify that the test of the first permanent magnet traction system for the high-power vehicle requires about 20 working days for debugging, the test device system greatly reduces energy consumption and saves test cost.

The scheme is applied to a high-power traction system for a vehicle for realizing a one-to-one equal-capacity and full-size test simulation, and can realize various tests of cooperative control among a diesel engine, a permanent magnet generator and a permanent magnet traction motor based on ground test conditions; the system has the capabilities of testing energy recovery, testing the external characteristics of a diesel engine set, controlling and testing a permanent magnet traction motor, testing system cooperative control, testing system stability, testing system ultimate capacity, testing system compatibility to different diesel engines, controlling differential speed of left and right wheels under the actual working condition of the vehicle, testing the traction and braking working conditions of the vehicle, testing a brake resistance consumption power spectrum, analyzing the economic performance of braking energy recovery of the tested traction system and the like. In addition, the technical scheme of the invention has the test device system with the test energy recovery function, so that the test cost is reduced, and the energy conservation and emission reduction are realized; and the extreme capability test can be realized, the stability and compatibility of the system can be effectively tested under various sudden change working conditions, and the reliability of the system is greatly improved.

It should be noted that, in addition to the test device for the permanent magnet traction system, which has been clearly described in the present invention, the present invention also protects the test method, which is infringed by the following schemes.

(1) The name of the system component and the name of the test device are tampered;

(2) by increasing or decreasing the test beds, for example, only the first test bed and the second test bed in the present application are reserved, the scheme of testing 1 permanent magnet generator and 1 permanent magnet traction motor system is tested, and the scheme of testing 1 permanent magnet generator and a plurality of permanent magnet traction motor systems by expanding the second test bed and the third test bed in the present application is also expanded.

It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting. A

Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, appearances of the phrase "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.