永磁同步电机有限控制集模型预测转矩控制系统研究

建立了基于定子磁链xy坐标系的永磁同步电机(PMSM)有限控制集模型预测转矩控制(FCSMPTC)系统,仿真验证了系统的有效性和可行性。针对磁链和转矩预测模型较为复杂的问题,提出了磁链和转矩的简化预测模型。理论分析、仿真和试验结果验证了FCSMPTC的简化模型与常规模型控制效果相当,可明显减小计算负担,提高系统实时性能。将电压矢量幅值和角度作为FCSMPTC的控制变量,设计了变幅值变角度的备选电压矢量集合。仿真结果表明该备选电压矢量集合可有效减小稳态转矩脉动,但动态性能不及传统备选电压矢量集合。基于不同备选电压矢量的特点,提出了根据系统状态自适应动态变化的备选电压矢量策略。仿真结果表明,该控制策略在静动态下均可取得良好的控制性能。

Finite Control Set Model Predictive Torque Control ofPermanent Magnet Synchronous Motor System

Finite control set (FCS) model predictive torque control (MPTC) system of permanent magnet synchronous motor (PMSM) was built based on stator flux xycoordinates. Simulation results testified its effectiveness and feasibility. As stator flux and torque predictive models were complicated, simplified predictive models were given. Theoretical analysis, simulation and experiment results showed that FCSMPTC system using simplified models could achieve equivalent control performances as using conventional predictive models, but simplified model could decrease calculation burden and improve real time performance. A candidate voltage vectors set was proposed with variable amplitude and angle which were used as control variables in FCSMPTC. The proposed candidate voltage vectors set could suppress torque ripple at steady state, but its dynamic response was worse than that of conventional candidate voltage vectors set. Thus, an adaptive control strategy was proposed, which adaptively used different candidate voltage vectors sets at different states. Simulation results showed that the control strategy could achieve good control performance at both steady and dynamic states.