基于有源阻尼的大功率永磁牵引电机电流控制

Current Control of High-power Permanent Magnet Traction Motor Based on Active Damping

相比于异步电机,永磁同步电机具有功率密度高、效率高、可轻量化等优点,在大功率牵引传动领域得到了越来越多的研究。由于牵引变流器中二次谐振回路的存在,永磁电机的电压和电流在特定的定子频率点会产生振荡,影响系统的稳定运行,而传统的永磁电机电流控制方法无法有效抑制此振荡。为此,提出了一种基于有源阻尼注入方法的新型电流控制策略,实现了大功率永磁牵引电机在宽转速范围内转矩的稳定发挥,半实物仿真和试验结果验证了此方法的可行性。

Compared with the asynchronous motor,the permanent magnet synchronous motor has advantages such as high power density,high efficiency and lightweight.Therefore,it attracts more and more attention in the field of high-power traction drive.Due to the existence of a secondary resonance circuit in the traction converter,the voltage and current of the permanent magnet motor will vibrate at a certain stator frequency point,thus affecting the system's stable operation.As a result,the traditional current control method for the permanent magnet synchronous motor cannot restrain the oscillation effectively.In this paper,a novel current control strategy based on the active damping injection method is proposed,which can realize the stable torque of a high-power permanent magnet traction motor in a wide speed range.The results of hardware in the loop simulation and experiments verified the feasibility of the proposed method.