永磁无刷直流电机驱动器并联系统环流的抑制

摘要

With the widespread use of PMBLDCM(permanent magnet brushless direct current motor), high-power, high-capacity drive technology is one of its research direction.The parallel operation of drivers can effectively expand the drive system's capacity,but the way is easy to introduce the circulate current.In order to restrain the circulate current, the system including separate direct current power supply for two paralleled inverters that feed the PMBLDCM was analyzed and the character of the system's circulate current was inferred.The control structure based on the circulate current feedback was put forward.The control structure only needs to control one inverter.Simulation results represent that the control structure can make two direct current supplies that have different amplitudes feed the load, and suppress the circulate current, which achieves a separate power supply brushless direct current motor with drivers in parallel.%驱动器并联方式能有效扩大驱动容量,但该方式容易引入环流.为了抑制环流,分析了两个独立电源供电的两台驱动器并联结构系统,阐述了环流的特性,并提出了基于环流反馈的控制结构.这种控制结构通过环流的反馈,只需要控制调整其中一台驱动器,就可减小两台驱动器输出电压的差异,实现环流抑制.仿真结果表明:这种控制结构降低了控制的复杂性,能够抑制环流,实现独立电源供电的无刷直流电机驱动器并联.