中文摘要：

提出一种新型的矩阵变换器控制策略。该控制策略通过有效变动SPWM波形的结构,得到使变压器工作于高频状态的SPWPM波形。将常规的SPWM波进行软化处理后,引入脉冲密度调制方式,使软化的SPWM波与双极性三态SPWPM波保持同步。并对正负极性调制后的软SP-WM波经过逻辑处理后,作为矩阵变换器开关管的驱动信号。矩阵变换器对SPWPM波形进行解调,恢复为常规的SPWM波形。对前级高频逆变桥工作于SPWM和SPWPM两种工作模式的输出波形进行了数学分析,证明了SPWPM波形中含有SPWM波的全部信息,但不含调制波的频率成分。因此更便于高频变压器进行能量传输。采用LCL三阶滤波器,较常规LC滤波器更能在高频段对高次谐波进行衰减。实验结果验证了理论分析的正确性和该控制策略的可行性。

英文摘要：

A novel control strategy for matrix converter was proposed.Through effective changing the structure of SPWM wave,the SPWPM wave which makes transformer work in high-frequency state was obtained.After the conventional SPWM wave was intenerated,pulse-density modulation was adopted to synchronize the soft SPWM wave with the bipolar three-state SPWPM wave.And the positive and negative polarities modulated soft SPWM wave was treated by logic,to obtain gates drive signals of matrix converter.Through demodulating the SPWPM wave,the matrix converter recovers it into the conventional SPWM wave.The mathematical analysis of the output wave of the former high frequency inverter respectively working on SPWM and SPWPM stage proves that the SPWPM wave contains the whole component of SPWM wave except the modulated wave frequency.Therefore,the energy can be transmitted by high frequency transformer effectively.The adopted LCL third-order filter is better than conventional LC filter in the high harmonic attenuation.Experimental results indicate that the theoretical analysis is correct and the control strategy mentioned above is feasible.