CRH5动车组牵引系统的多输出间接矩阵变换器的控制研究

针对CRH5动车组牵引系统AC-DC-AC变换器体积大,功率因数低、能量非双向流动等问题,文章引入多输出间接矩阵变换器(indirect matrix converter,IMC),并采用模型预测控制(model predictive control,MPC)方法实现多异步电机(induction motor,IM)控制。基于构建的CRH5动车组IMC-双IM牵引系统,建立电机定子磁链和转矩预测模型,根据输出调速性能和电网需求建立目标函数并寻优以实现动车组的高性能牵引。仿真表明在MPC方法控制下CRH5动车组牵引系统输入侧无功功率约为0,输出侧两台IM可以高性能独立调速运行。

Aiming at the problems of large size,low power factor and non-bi-directional energy flow of AC-DC-AC converter in traction system of CRH5 EMU,multi-output indirect matrix converter(IMC)is introduced in this paper,and model predictive control(MPC)method is adopted to realize multi-induction motor(IM)control.Based on the IMC-double IM traction system of CRH5 EMU,the prediction model of motor stator flux and torque is established.According to the output speed regulation performance and power grid requirements,the objective function is established and optimized to achieve high performance traction of EMU.The simulation results show that under the control of MPC method,the reactive power on the input side of the traction system of CRH5 EMU is about 0,and the two IM on the output side can run independently with high performance.