基于Z源逆变器的异步电机调速系统研究

Research on Speed Control System of Induction Motor Based on Z-source Inverter

在电力拖动系统中,需要采用逆变器将直流电转换为交流电,实现异步电动机调速。针对电机拖动系统中传统电压型逆变器上下桥臂开关管不能短路、电流型逆变器负载不能开路的问题,采用Z源逆变器,改善电机调速系统性能。文中将Z源逆变器最大升压控制和异步电机转子磁链空间矢量控制技术结合起来,提出了Z源升压FOC控制算法。更进一步地,在采用Z源逆变器的电机调速系统中,对Z源升压FOC控制算法进行建模与仿真,结果表明,Z源升压FOC控制算法能够实现较好的调速性能。

In the motor drive system, need to use the inverter to convert DC to AC for motor. For the traditional voltage inverter, upper and lower bridge arm cannot be in short - circuit, and for current inverter load can＇t be open. Use Z - source inverter, can improve the performance of motor speed control system. In this paper, combine maxi- mum boost control for Z - source inverter and FOC for asynchronous motor, and the Z - source boost FOC control al- gorithm is proposed. Further. In the motor control system using Z - source inverter, the Z source boost FOC control algorithm is modeled and simulated. The results show that the Z - source boost FOC control algorithm can achieve better performance.