基于多模式SVPWM算法的永磁同步牵引电机弱磁控制策略

High-Power Permanent Magnet Fiux-Weakening Strategy Based on Multi-Mode SVPWM

弱磁控制技术可以降低逆变器的容量、拓宽调速范围,对提高轨道交通永磁同步牵引系统的性能有着重要而现实的意义。性能优异的调制方式更能保证弱磁系统输出良好的控制性能,而大功率传动系统开关器件的开关频率较低,使得传统的空间电压矢量异步调制方法已不能满足控制策略需要,本文在分析空间电压矢量多模式调制算法原理以及永磁同步电机弱磁原理的基础上,提出了新型的基于多模式空间电压矢量调制算法的永磁同步牵引电机弱磁控制策略,保证永磁同步牵引电机弱磁控制系统能充分利用开关频率,且在异步调制和分段同步调制段都具有良好的输出特性,仿真和试验验证了本方案的可行性和有效性。

The flux-weakening control technology could reduce the capacity of the inverter and widen the speed rang,and this are important to improve the performance of the railway traction system of permanent magnet synchronous motor.The flux-weakening control system would be have more excellent output performance because of the excellent performance of modulation,but the traditional space voltage vector modulation could not meet the need of the control strategy because of the lower switch frequency of the inverter.This paper proposes a new permanent magnet synchronous motor flux-weakening strategy based on the principle of the multi-mode space vector pulse width modulation algorithm and the principle of the permanent magnet synchronous motor flux-weakening control theory.Then,the method could ensure that the permanent magnet flux-weakening control of railway traction system can make full use of the switch frequency and have better performance output under asynchronous modulation and subsection synchronous modulation.The simulation and experiment verify the feasibility and effectiveness of this method.