基于背靠背变流器的电机测试平台

An Electrical Machine Testbed by Back-to-Back Converter

为了验证电机的性能和可靠性,需要通过测试平台进行相关特性的测试。然而,大功率电机测试需要大功率电源来维持电机的运行,硬件成本较高。介绍了一种基于背靠背变流器的电机测试平台,主体结构是两台电机和一个用于控制的背靠背变流器,其中一台电机充当另一台被测电机的负载,变流器共用直流母线,同时控制两台电机运行。由于共用直流母线,能量可以在两台电机之间循环流动,只需要一个用于补偿系统损耗的容量较小的电源就可以维持系统的稳定运行,提高了测试平台的运行效率,降低了硬件成本。仿真和实验验证了该测试方案的可行性。

In order to validate the reliability and performance of electrical machine,it is necessary to test the characteristicsof the machines in a testbed.However,for the test of a high power machine,rated power should be provided by the power supplier and requires high power capability for the power supplier in the testbed,which increases the hardware cost.A testbed based on back-to-back converter was designed.The main body contains two machines and a back-to-back converter for the control.One machine was used as the load of the other one.The converter for the two machines was with the same DC link and formed a back-to-back converter,which can control two machines simultaneously.Because the energy can flow between the two machines,the DC power supplier for the testbed used only a small amount of energy to compensate the power losses in the system,which improved the efficiency of the testbed and decreased the hardware cost.Simulation and experiment verification was provided to support the designed testbed.