一种改进的过调制方法用于矩阵变换器驱动感应电机仿真研究

矩阵变换器采用传统空间矢量调制在线性调制区域最大电压传输比为0.866,严重限制了其应用范围,特别是在交流调速系统中.为提高矩阵变换器的电压传输比和降低输出电压谐波含量,提出一种基于多轨迹矢量加权的改进过调制策略.分析了改进前后的多轨迹矢量加权过调制原理,并对改进前后过调制方法输出电压谐波含量进行了理论分析.分析结果表明,改进后的过调制方法具有更低的输出电压谐波含量.通过将改进前后过调制方法用于矩阵变换器驱动感应电机的调速性能进行仿真验证,仿真结果表明,改进后过调制方法具有更好的调速性能和更低的定子电流谐波含量.

Simulation Research of Applying An Improved Over-modulation Method in Matrix Converter Drive Induction Motor

The maximum voltage transfer ratio (VTR) in linear region with traditional space vector pulse width modulation of matrix converter (MC) is 0.866, which strictly restrains its application, especially in AC adjustable-speed control. To improve the VTR and decrease output voltage total harmonic distortion (THD) of MC, an improved multi-orbit vector weighter over-modulation method is proposed. The over-modulation principal before and after the improved multi-orbit vector weighter method are introduced and the output voltage THD before and after the improved over-modulation method are analyzed, the analysis indicates that the improved over-modulation method has lower output voltage THD. The adjustable-speed control performances of induction motor driven by matrix converter with the improved multi-orbit vector weighter over-modulation before and after are emulated. Emulated results indicate that the improved over-modulation method has better performances of speed-control and lower THD of output voltage.