永磁同步电机两相斩波式电流滞环控制

Hysteresis current control with two-phase chopping for permanent magnet synchronous machines

电流滞环控制是永磁同步电机(PMSM)常见的控制方法。本文在传统滞环控制的基础上,提出以两相斩波替代三相斩波的改进控制方案。文中介绍了两相斩波的设计思路,阐述了其控制流程,并分析了改进方案对降低开关损耗、提高系统效率所能起到的作用。实验结果验证了改进方案的可行性与有效性。

Hysteresis current control （HCC） is often used to control permanent magnet synchronous machines （PMSM）. In the traditional HCC method, all switching devices of the inverter keep chopping, resulting in remark-able switching loss, especially in those devices which carry high currents. In this paper, a new HCC method is pro-posed. Devices of only two phases which have relatively lower currents keep chopping, making the actual currents follow their references and also restricting the actual current of the third phase. Devices of the third phase which contains the highest current have no chopping, only provide a flowing path of the current, i. e. , its upper device is always on and the lower is always off if the current is positive, and vice versa. Clearly, the actual current of the third phase can inherently follow its reference. By employing the new HCC method, the inverter switching loss is reduced and the drive system efficiency is improved, while the current harmonics do not increase. These have been verified with experimental results.