串联型Z源滞环控制策略研究

Research on hysteresis control algorithm based on series Z-source

基于Z拓扑的逆变系统,需在开关控制信号中加入直通信号。传统的变频滞环控制无法实现。提出一种适用于串联型Z源的定频电流滞环控制策略,综合传统滞环控制和串联型Z源的优点;采用定频控制,降低系统损耗,简化滤波;利用Z源的升压作用,提高系统功率输出能力。通过Matlab仿真与实验验证,证明了策略的可行性。

In Z-source based power inverter system, the shoot through time must be added in the switch signals, which can not be achieved by the traditional hysteresis control algorithm. A new kind of control algorithm based on fixed-frequency current hysteresis for series Z-source was proposed, which retained the advantages of traditional hysteresis control and series Z-source. Due to the use of the fixed-frequency control, the system loss was reduced, and the filter was simplified. With the boosting role of Z-source, the power output capability of system was improved significantly. By simulation with Matlab and experiments, the correctness of the strategy was proved.