五相逆变器的不连续空间矢量PWM控制

多相逆变器的PWM控制技术是船舶电力推进中的关键技术,其性能对推进系统的特性会产生重要的影响。本文在五相逆变器连续空间矢量PWM(CSVPWM)控制的基础上,通过对两个零矢量的合理使用,提出了一类新的五相逆变器不连续空间矢量PWM(DSVPWM)控制方法。该方法在一个开关周期内只采用一个零矢量,开关次数比CSVPWM少1/5,因而可以降低开关损耗,同时其输出目标线电压为正弦波,因此谐波性能优于最小开关损耗SVPWM控制方式。提出了几种典型的DSVPWM实现方法,结合仿真与实验分析了它们的基本工作特性、适用的负载类型以及谐波性能。

Discontinuous Space Vector PWM Control of Five-Phase Inverter

The PWM technology plays an important role in the ship electrical propulsion.Its characteristic will have effect on the performance of propulsion system directly. In this paper, a novel discontinuous space vector PWM (DSVPWM) control of five-phase inverter is proposed by arranging the two zero vectors reasonably. Comparing with the continuous space vector PWM (CSVPWM) method, the DSVPWM use only one zero vector in one switching period, so the switching loss is only the four fifths of the CSVPWM. However, the output target line voltages of DSVPWM are still standard sine waves, the harmonic performance is superior to that of the minimum switching loss SVPWM. Five classic DSVPWM realization methods are given, and the operation characteristic, adapted load types and total harmonic distortion rate of them are analyzed by analytical theories, simulations and experiments.