Z源逆变器的电压电流双闭环控制

提出了Z源逆变器的电压电流双闭环控制方法,分析了Z源逆变器控制系统的建模,并在此基础上设计了Z源逆变器双闭环控制系统的调节器.Z源逆变器双环控制的电流内环调节器采用比例环节,以提高内环的开环增益;电压外环调节器采用PID环节,以在系统稳定的条件下增加其带宽.由于Z源逆变器是三相三线制系统,所以在实现控制系统时引入了Clarke变换,从而实现了三相三线制的解耦.仿真和实验证明了Z源逆变器的电压电流双闭环控制方法的正确性.

A Voltage-current Close Loop Control Algorithm for Z-Source Inverter

A voltage-current close loop control algorithm for Z-source inverter is presented.After modeling the Z-source inverter system,modulators for the double close loop of Z-source inverter system are designed in a control system mode.The modulator of the inner current loop is realized by proportion element to improve the open-loop gain of the inner loop,and the modulator of the outer voltage loop is realized by Proportion Integral Differential(PID) element to ensure the stability of the system and to improve the band width of the system.The Clarke transformation is adopted to decouple the three phase-three wire system of Z-source inverter.The program design of the digital control system of Z-source inverter is briefly described.Finally,the simulative and experimental results verify the validity of the double close loop of Z-source in-verter.