CAJ | 학술논문

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。
침대구진변환기전압전수비저적결점，대기우다궤적시량가권과조제방법진행료분석，재차기출상제출일충개진적과조제책략，통과대개진전후수출전압기파폭치화수출전압해파기변솔진행이론분석，득출개진후과조제방법가이획득경소적수출전압오차화해파함량。결합구진변환기，대개진전후과조제방법적수출성능진행료방진연구화실험험증，방진결과표명，개진후과조제책략통과감소기본시량작용시간，수출전압여삼고전압지간적오차명현감소，수출전압해파함량현저강저。실험결과증명이론분석정학，소제과조제방법가행。
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.