基于buck电路的矩阵变换器策略的改进

Z-source matrix converter based on buck circuit

基于buck电路矩阵变换器的控制策略,动作响应快,具有一定的抗干扰性,而矩阵变换器的缺点是电压传输比低。在此基础上对其进行改进,在矩阵变换器前端加入z源网络,通过控制占空比和调制系数起到buck-boost的作用,提高矩阵变换器的电压传输比。介绍了该方法的数学规则,给出对应开关管的占空比系数的数学表达式。通过Matlab/Simulink软件建立矩阵变换器的数学仿真模型,验证了这一改进的正确性和可行性。

A new matrix converter conrtrol strategy was proposed based on buck circuit. Compared with Venturini direct function transformation and space vector modulation method, its advantages were fast response,and the system was capable of anti-interference, but still had the main drawback of low voltagetransfor ratio. This did some improvement to the above strategy by join z-source network to the topo. Buck-boost function by conrtolling shoot-through duty ratio and modulation index were provided by z-source network to overcome the above shortcomings. The math principle and bi-directal switch math expression were analyzed in detail. Finally, adopting Matlab/Simulink simulation,simulation results show that the theoretical analysis of the control strategy is correct and feasible.