一种可提高转矩输出能力的高速列车牵引电机方波工况单环弱磁控制策略

A Single-loop Field-weakening Control Strategy for High-speed Train Traction Motor with Increased Torque Output Capability under Six-step Mode

对于高速列车牵引传动系统,牵引电机在高速区会进入方波工况,方波下传统矢量控制算法失效。提出了一种方波单环弱磁控制策略,避免了传统的双环方案在方波工况下易饱和的问题,改善了电机电流的动态响应性能。在牵引电机进入方波工况前,采用传统双电流环矢量控制;而在进入方波工况后,考虑了牵引电机在方波工况下的限制条件,采用基于转矩电流误差调节的单环弱磁控制策略。同时,利用电压幅值判据,实现线性区与方波区的平滑过渡。理论分析和实验结果都证明了该方波弱磁控制策略可实现电流快速跟踪响应,转矩准确而快速的输出,且易于实际应用。

For high-speed train traction driving system, the traction motor usually operates under the six-step mode in high speed region. Traditional vector control strategy is no longer suitable for the six-step mode. In order to solve the problem that the double loop control is easy to saturate under the six-step mode and improve the traction motor current tracking response capability, this paper proposed a single loop field-weakening control strategy under the six-step mode. Before the traction motor enters the six-step mode, the conventional vector control algorithm was applied. Considering the limitation of the traction motor under the six-step mode, the single loop field-weakening control strategy based on the torque current error adjustment was adopted. Meanwhile, the voltage amplitude criterion was used to realize the smooth transition between linear region and square wave region. Both the theoretical analysis and experimental results show that the field weakening control strategy can achieve fast tracking response of current, accurate and fast torque output, and easy practical application.