基于输出协同调制的四端输出矩阵变换器开关组合优化方法

含补偿单元的四端输出三相-两相矩阵变换器(3-2MC)能有效提升带两相独立负载的矩阵变换器输入性能,在现有的调制方法下,四端输出3-2MC的电压增益较三端拓扑低,且该电压增益是与多个变量有关的表达式.针对上述缺陷,提出一种输出协同调制的开关组合优化方法,该方法在单位调制周期时间内对同极性输出侧和补偿侧进行协同调制,以提高有效矢量利用率.通过理论推导和分析可得,与现有调制方法相比,采用所提出方法能将四端输出3-2MC电压增益提高到常规三端输出3-2MC的水平,同时使得四端输出3-2MC的电压增益是一个只与输出不对称度有关的函数表达式.仿真结果表明,基于输出侧协同调制的开关组合优化方法能够实现输入与输出功率的解耦,有效拓宽四端输出3-2MC的线性调节区间,同时使系统具有良好的输入与输出性能.

Switch combination optimization method of four-terminal output matrix converter based on output co-modulation

The four-terminal three-phase-two-phase matrix converter(3-2MC) with compensation units can effectively improve the input performance of the matrix converter with two-phase independent load. Under the existing modulation method, the voltage gain of the four-terminal output 3-2MC is lower than that of the three-terminal topology, and the voltage gain is an expression related to multiple variables. In order to solve these problems, the article proposes a switch combination optimization method for cooperative modulation on the output side. This method performs cooperative modulation on the output side and the compensation side of the same polarity in unit modulation cycle time to improve the effective vector utilization. By theoretical derivation and analysis, compared with the existing modulation methods, the proposed method can improve the voltage gain of the four-terminal output 3-2MC to the level of the conventional three-terminal output 3-2 MC, and make the voltage gain of the four-terminal output 3-2MC be a function expression only related to the output asymmetry. The simulation results show that the optimal switch combination method based on the output side cooperative modulation can not only realize the decoupling of input and output power, but also effectively expand the linear regulation range of fore-terminal output 3-2 MC and make the system still have good input and output performance.