说明：  该文件是间接式双级矩阵变换器的开环仿真模型。输出结果符合理论推导。采用s函数编程的方法实现空间矢量调制策略
(This file is indirect two-stage matrix converter of the open loop simulation model. Output the results accord with theoretical derivation. The s function programming method of space vector modulation strategy. )