大功率牵引变流器电流谐波最小PWM控制策略的研究与实现

Research and Implementation for High Power Traction Convertor Harmonic Minimum PWM Control Strategy

大功率交流传动机车牵引传动系统受器件开关频率的限制,在高速运行区需要采用同步优化调制的方法来减小谐波,针对电流谐波最小PWM调制技术,对其控制原理进行了理论分析,论述了一种基于数字信号处理器DSP的数字实现方法,研究了不同调制模式之间的波形切换原则及控制策略,在谐波抑制性能方面与SHEPWM调制算法进行了对比分析,最后通过仿真和实验对理论分析的正确性和有效性进行了验证。

For the constraint of switching frequency,the traction drive system of high power AC locomotive needs using synchronous optimization modulation PWM in high speed area to reduce the harmonic wave.For current harmonic minimum PWM modulation technology,detailed theoretical analysis of its control principle is carried out in this paper,a digital implementation method based on digital signal processor(DSP)is discussed,this paper studies the principles and control strategy of waveform switching between different modulation modes,in terms of performance and harmonic suppression SHEPWM modulation algorithm were compared and analyzed,finally through simulations and experiments on the correctness and validity of theoretical analysis was verified.