矩阵变换器改进多轨迹矢量加权过调制方法

An Improved Multi-orbit Vector Weighted Over-modulation Method of Matrix Converters

针对矩阵变换器电压传输比低的缺点,对基于多轨迹矢量加权过调制方法进行了分析,在此基础上提出一种改进的过调制策略,通过对改进前后输出电压基波幅值和输出电压谐波畸变率进行理论分析,得出改进后过调制方法可以获得更小的输出电压误差和谐波含量。结合矩阵变换器,对改进前后过调制方法的输出性能进行了仿真研究和实验验证,仿真结果表明,改进后过调制策略通过减小基本矢量作用时间,输出电压与参考电压之间的误差明显减小,输出电压谐波含量显著降低。实验结果证明理论分析正确,所提过调制方法可行。

Aiming at the defect of low voltage transfer ratio in matrix converters, the over-modulation method based on the weighted multi-orbit vector was analyzed, and based on this an improved over-modulation method was presented. The output voltage fundamental amplitude and total harmonic distortion（THD） of output voltage were analyzed before and after using the improved weighted multi-orbit vector method, and then the output voltage error between the referenced value and the actual value and THD of output voltage were smaller with the improved method. The output voltage performances of the matrix converter before and after using the improved weighted multi-orbit vector were simulated and tested. Simulation results indicated that the error between output and given voltage evidently decreased and THD of output voltage were lower with the improved method by decreasing the basic vector working time. Experimental results verified that theoretical analysis was right and the proposed over-modulation method was feasible.