高性能五相逆变器PWM算法研究

Research on High Performance PWM Technique of Five-phase Inverter

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。传统的五相电压空间矢量脉宽调制(SVPWM)由相邻的两个大矢量和零矢量合成,只是三相SVPWM控制方法的一种简单应用,逆变器输出目标线电压中含有较大的3次谐波成分。在详细分析五相系统电压空间矢量的基础上,提出了一种低输出谐波和低开关损耗(Less Harmonic Less Loss简称LHLL)的SVPWM法,即LHLLSVPWM控制方法。对提出的控制方法的性能进行了详细的理论分析,并与传统控制方法进行了对比分析,通过实验进行了验证。

The PWM technology of muhiphase inverter is one of the most important technologies in multiphase drive system.The traditional five-phase SVPWM is in fact the application of the traditional three-phase SVPWM method,which uses two adjacent large vectors and zero vector to compose reference vector, and the output line voltages include high third harmonic.On the basis of profound analysis about characteristic and rule of five-phase inverter＇ s voltage veetor,a novel SVPWM named Low Harmonic Low Loss SVPWM （LHLLSVPWM） is presented.The characteristic and performance of the five-phase LHLLSVPWM are studied with theoretical analysis and are compared with the traditional five-phase SVPWM,it is proved by experiment.