中文摘要：

提出矩阵变换器（MC）4步换流中一种通用的解码器算法，并给出具体实现过程。可适用于别的开关表和开关换流策略。具有参考价值。分析该MC的空间矢量调制策略和开关表的优化，讨论了硬件电路的设计。提出了基于数字信号处理器（DSP）28335和复杂可编程逻辑器件（CPLD）的联合控制方案，首次解密了4步换流中9个双向开关状态定量求解的步骤，推导出其表达式。搭建了基于AST965驱动的18合1双向开关模块的三相．三相交．交MC样机，实验研究较好地验证了系统设计和控制策略的正确性、可行性和可靠性，为该MC的实际应用和早日产品化提供了有效的设计方法和实验基础。

英文摘要：

A general decoder algorithm of 4 step commutation is put forward for matrix converter（MC）.And its specif- ic realization process is given out, which is fit for other switching tables and switching commutation strategies, and has reference values.The space vector pulse modulation and optimization of switch table about MC are analysed, the design of its hardware circuit is discussed, as well as the combination control scheme based on the digital signal pro- cessor（DSP） 28335 and complex programmable logic devices （CPLD）.The solving steps of 9 bi-directional switches＇ states are disclosed for 4 step commutation at first.And the switch expressions are deduced.The 1.5 kW MC prototype of 18 bi-directional switches integrated into one module for 3 phase to 3 phase MC is built.Experimental research verifies the properties, feasibility and stability of the system design and control strategy well, which provides an effec- tive design method and experimental foundation for practical application and production of MC.