永磁同步电机弱磁最优控制策略研究

针对永磁同步电机(PMSM)在恒转矩区起动能力差、在恒功率区电流轨迹不易跟踪等问题,提出基于电压反馈复合电流前馈的定子电流弱磁最优控制策略。通过判断电流前馈环节达到稳定时所需的电流与采用最大转矩电流比(MTPA)算法所得电流大小,使定子电流在恒转矩区通过电流前馈作用快速跟踪MTPA曲线,加快起动；在恒功率区采用电压反馈复合电流前馈的策略,增强系统抗干扰能力的同时最大化直流母线电压利用率。为了验证该策略的可行性,搭建PMSM仿真模型,构建以dSPACE1007为核心的试验平台,对其进行仿真和试验,结果表明了该策略的稳定性和有效性。

Research on FluxWeakening Optimal Control Strategy ofPermanent Magnet Synchronous Motor

Aiming at the problems that the permanent magnet synchronous motor (PMSM) had poor starting ability in constant torque region and the path of current in constant power region was difficult to track, a stator current fluxweakening optimal control strategy based on voltage feedback current feedforward was proposed. By comparing the current which made the current feedforward loop stabilize and the current obtained from the maximum torque per ampere (MTPA) algorithm, the stator current could quickly track the MTPA curve through the current feedforward action in the constant torque region to accelerate starting process. The voltage feedback current feedforward strategy in the constant power region increased the system antiinterference capability and maximized the DC bus voltage utilization. In order to verify the feasibility of the proposed strategy, a PMSM simulation model was built and the experimental platform with dSPACE1007 as the core was constructed. The results of the simulation and experiment proved the stability and effectiveness of the strategy.