传统矩阵变换器最小相位误差空间矢量过调制策略

Minimum Phase Error Space-Vector Over-Modulation Strategy of Conventional Matrix Converter

对传统矩阵变换器的电压传输比特性进行理论研究,推导瞬时电压传输比与输出/输入频率比、输出电压初始相位和输入功率因数角之间的函数关系,分析瞬时电压传输比的变化规律。通过对输出线电压进行二重傅里叶变换,得到传统矩阵变换器最小相位误差过调制下的电压传输比上限值。在此基础上,提出一种基于线性加权原理的最小相位误差过调制策略。仿真与实验结果验证,所提策略可使传统矩阵变换器的基波电压传输比达到0.953,同时保证调制输出电压基波幅值相对参考电压幅值的误差小、输出电流谐波含量低。

This paper investigates the voltage transfer ratio(VTR)characteristics of conventional matrix converter(CMC).The analytic expression of instantaneous voltage transfer ratio(IVTR)affected by output/input frequency ratio,initial phase of output voltage,and input power factor angle is derived and analyzed.By performing double Fourier transform on output line voltage,the maximum fundamental VTR with minimum phase error(MPE)over-modulation strategy is obtained for CMC.A novel MPE over-modulation strategy adopting linear weighted theory is proposed.Both simulation and experimental results show that the proposed strategy can improve fundamental VTR of CMC up to 0.953 while maintaining small output voltage amplitude error and low output current harmonic components.