采用过调制技术的矩阵变换器应用技术研究

Application of matrix converter based on over modulation

矩阵变换器MC(Matrix Converter)是一种新型的电力电子功率变换器,但现有的MC电压传输比低(<0.866),制约了MC的应用。在介绍MC双空间矢量脉宽调制技术原理的基础上,提出适合MC的过调制方法,研究了MC输出电压传输特性及其谐波分布。通过Matlab/Simulink仿真及样机实验,分析比较了线性调制(0<m<1.155,m为调制系数)、过调制模式Ⅰ(1.155<m<1.212)、过调制模式Ⅱ(1.212<m<1.273)及六阶梯波控制(m=1.273)4种情况下的输出线电压波形及其谐波分布,计算出电压传输比分别为0.86、0.94、0.98、1.0。仿真及实验表明,过调制模式Ⅰ因其谐波含量不大,有较大应用价值;过调制模式Ⅱ则有较大的谐波含量,需加以抑制或采取其他策略消除。

The matrix converter is a novel electronic power converter,but its low voltage transfer ratio（〈0.866） limits the application. The fundamental principle of the pulse width modulation based on the double-space vector is firstly introduced. Based on it,the over modulation is presented for the matrix converter and the output voltage transfer characteristic and its harmonic distribution are then studied. Through simulation with Matlab/Simulink and the prototype test,output line voltage waveforms and their harmonic distributions are compared under four conditions as follows：the linear modulation（0〈m〈1.155,m is the modulation coefficient）,over modulation mode Ⅰ （1.155〈m〈1.212）, over modulation mode Ⅱ （1.212〈m〈1.273） and 6-level harmonic control（m=1.273）. Their calculated voltage transfer ratios are 0.86,0.94,0.98 and 1.0 respectively. Finally,results show that,the over modulation mode Ⅰ is worthy for its few harmonics,while large numbers of harmonics of the over modulation mode Ⅱ need to be suppressed.