过调制矩阵变换器的电压传输特性及谐波分析

Voltage Transfer Characteristic And Harmonic Analysis Of Matrix Converter Under Over Modulation

矩阵变换器电压传输比不大于0.866,是制约矩阵变换器发展的最重要因数之一,因此提高电压传输比的控制策略成为研究热点。矩阵变换器过调制方法在有些文献中提及,但论述简单,并没有实验证明。该文采用过调制方法来提高电压传输比,阐明了这种方法的实质,并通过仿真实验和物理样机实验证明这种方法的可行性和有效性,进一步分析了过调制时的电压传输特性及其谐波分布,其最大电压传输比可达到1.0左右。过调制模式Ⅰ其谐波含量不大,有较好的应用价值,其电压传输比可达0.955。过调制模式Ⅱ则有较大的谐波含量,需加以抑制。

The voltage transfer ratio of matrix converter is less than 0.866, so the strategy to increase the voltage transfer ratio becomes researching focus. Over modulation is suggested in many papers, but it is simple and isn＇t tested by experiments. In the paper over modulation method was adopted to increase the voltage transfer ratio. The essential of the method was clarified. At last feasibility and validity was testified by simulation and sample. The voltage transfer characteristic was analyzed and output voltage harmonic distribution was discussed under over modulation mode. The maximal voltage transfer ratio is 1.0. Harmonics of output voltage was suppressed effectively and the voltage transfer ratio can reach to 0.95 under over-modulation mode I, so over-modulation mode I is of practical value. There is much harmonic in output voltage under over-modulation mode Iland the harmonics should be suppressed.