双PWM变换器的矿用PMSM直接转矩控制系统

Research on mine-purpose PMSM direct torque control system based on dual PWM converter

为解决矿用永磁同步电机电能利用率低、污染电网严重以及转矩和磁链脉动较大等问题,提出一种基于双PWM变换器的PMSM直接转矩控制方式。通过建立电网侧PWM整流器的模型,设计了PWM整流器的滑模控制器,利用Matlab/Simulink软件进行建模仿真实验,分析整流器输出电压和同步电机定子的磁链、转矩和转速。结果表明,该控制方式电机具有较好的输出响应,系统可得到稳定的540 V直流电压,突加负载后,电机响应时间减少了0.01 s。仿真结果验证了该方案的有效性和可行性。

This paper proposes a novel PMSM direct torque control system based on dual PWM converter,which is designed to eliminate the problems resulting from the use of mine-purpose PMSM,such as the lower energy utilization rate,the more serious pollution of the power grid and the greater torque and flux fluctuation.Dual PWM converter could work better by achieving two-way power flow and improving the utilization of mechanical equipment on the power.The study involves designing the sliding mode controller of PWM rectifier by developing the model of PWM rectifier on the grid side;performing simulation experiments using Matlab/Simulink software;and analyzing output voltage of rectifier and stator flux,torque and speed of synchronous motor.The results show that the system has a better output performance and more stable DC voltage,with the resultant reduction of 0.01 s in the response time of the motor after the disturbance.Simulation verifies the validity and feasibility of the proposed scheme.