基于合成矢量的双级矩阵变换器驱动感应电机电流控制策略

Current Control Strategy for Induction Motor Fed by Two-Stage Matrix Converter Based on Complex Vector

将双级矩阵变换器(two-stage matrix converter,TSMC)作为感应电机的驱动装置,针对传统矢量控制中感应电机参数变化造成控制系统解耦不充分的问题,提出了基于合成矢量的TSMC驱动感应电机电流控制策略。对TSMC与感应电机合成矢量的数学模型进行推导和合理的简化。利用合成矢量根轨迹法设计出一种基于复数比例–积分控制器的电流闭环控制系统,解决了随着系统频率增加控制系统控制性能大大下降的问题,并降低了常规解耦控制系统对电机参数的依赖性。仿真结果表明:TSMC能提供满足感应电机调速要求的高质量输出电压和电流,所提出的控制策略能有效改善控制系统的动态和稳态性能。

To solve the problem that in traditional vector control the decoupling of control system is insufficient due to parameter variation of induction motor, two-stage matrix converter （TSMC） is utilized as the driver of induction motor and a current control strategy for induction motor fed by TSMC based on complex vector is proposed. The mathematical model for complex vectors of induction motor and TSMC are derived and rationally simplified. Using root locus method of complex vectors, a complex PI controller based close-loop current control system is designed to deal with the trouble that the performance of control system evidently deteriorates with the increase of power system frequency, and the dependence of traditional decoupling control system on motor parameters can be reduced. Simulation results show that TSMC can offer high-quality voltage and current output that can meet the requirement in rotation speed regulation of induction motor, and it is proved that the proposed control strategy can improve dynamic and steady state performances of control system effectively.