Feasibility plan for electromagnetic compatibility test of new energy power system
After understanding the main contents of the power system compatibility test, the author will discuss the feasibility of the electromagnetic compatibility test of the motor and controller for the new energy power system. Our main consideration for the drive motor system compatibility test is to consider two factors: one is to clarify the test object; the other is to scientifically arrange the drive electromechanical system and effectively supervise the operation.
Identify the test object.
The main object of our electromagnetic compatibility test for motors for new energy vehicles is to drive the motor as a whole. The traditional test method is to separate the main components of the power system and the inverter to perform independent testing. This layered test method has poor test results and high test cost. Therefore, we have to use the overall measurement method to test the compatibility of the drive motor system.
Scientifically arranged drive motor systems. The arrangement of the drive electromechanical system has an important influence on the test results. Careful selection of layout during the test is the key to ensuring correct measurement results. At present, there is no specific definition of the arrangement in China's relevant standards or although some regulations, these regulations cannot be adapted to the test of the drive motor system. Therefore, when we arrange the drive motor system, we mainly choose the layout of the simulation experiment.
The drive motor system is typically loaded during system compatibility testing. Loading the drive electromechanical system can effectively increase the emission level. The author has done experiments on this, and the author and the professional have produced a trolley for testing. In this trolley, the drive motor system is mainly loaded by the chassis dynamometer.
After loading in this way, by observing the experimental data, the author found that the emission level has been greatly improved, and is 50 dB more than the average. System loading is the key to improving the performance of drive electromechanical systems. Conditions are used to load the system during the measurement process. While seeing the benefits of system loading, we must also realize that there are still many limiting factors in the loading process of new energy vehicle systems in China. The most typical factors are two: First, to achieve system loading requires a special set of semi-wave darkroom, the test cost will be high; second, the current system loading technology in China is still immature, can not adapt to the complex situation. When we are testing the compatibility of the drive motor system, we must fully consider the above two factors. To optimize the compatibility test under the established conditions.
4 compatibility test standards
After understanding the feasibility of measuring the energy system of new energy vehicles, we must accurately grasp the test standards. Mastering these compatibility test standards is important for scientific testing. Our selection of reference standards for compatibility testing is mainly based on the following aspects:
One is to investigate from the perspective of radiation emission. The current reference standards for radiation angles are mainly GB18655-2002 and GB/T18655-2002. These two standards are mainly used to measure the receiving devices in new energy vehicles. These two standards are used in a very wide range. The drive motor system can be applied to the above two standards, so that the various devices in the car can achieve better performance. For example, the author conducted a professional investigation of the driving motor system of a new type of new energy car from the perspective of radiation emission. After investigation, it was found that the vehicle load GB18655-2002 standard, but the performance of radiation protection needs to be improved.
The second is radiation immunity. For the measurement of radiation immunity, we mainly use the GB/T17619-1998 standard for testing. The main reason why we use this standard for testing is that the measurement standard has clearly defined the immunity limit and measurement method. There is also a clear definition of the measurement frequency range. This standard is not specifically used to measure the electromagnetic compatibility of motors used in new energy power systems, but since the electromagnetic radiation environment is not much different from the standard radiation environment, we have adopted such standards for testing.
The third is conduction immunity. The tests for conducted immunity are mainly tested according to standards such as ISO 7637-3-2007 and ISO 7637-2-2004D. These standards specify the test method for transient immunity of the 24V power line of the vehicle. According to this standard, the conducted immunity has eight pulse forms, which are 1, 2a, 3a, 3b, 2b, 4, 5a, 5b, respectively. The first four forms can be used for compatibility. Sex test.
With the increasingly tight traditional Chinese energy situation, accelerating the development of new energy has become the consensus of all walks of life. At present, the development and application of new energy vehicles in China has effectively alleviated the situation of energy shortage. However, since the new energy itself power system emits strong electromagnetic radiation during normal operation, it is very important to test the electromagnetic compatibility of the motor and controller.