基于离散滑模观测器PMSM瞬时功率预测控制

Research on Predictive Instantaneous Power Control Based on Discrete Sliding Mode Observer for PMSM

滑模观测器广泛应用于PMSM无位置传感器控制理论中。传统滑模观测器都建立在连续数学模型基础上,而实际电机调速系统以及瞬时功率预测控制都是采用离散算法。在建立PMSM调速系统离散化数学模型基础上,分析离散滑模观测器存在条件。利用离散滑模观测器观测电机转速及转子角。利用瞬时功率数学模型设定价值函数,结合瞬时功率预测控制算法,建立基于离散滑模观测器的PMSM瞬时功率预测控制系统,用以简化系统结构,减小因开关频率限制所产生的抖动及控制误差,提高系统动静态性能。仿真结果验证所提控制算法的准确性和有效性。

Sliding mode observer（ SMO） is widely used in PMSM control theory without position sensors.Traditional sliding mode observer is built on the basis of continuous mathematical model,while actual motor speed control system and predictive instantaneous power control algorithm are discrete. The presence conditions for discrete sliding mode observer（ D-SMO） was presented on the basis of discrete math model for motor speed control system. Rotor speed and rotor angle could be observed by using D-SMO,combing with predictive instantaneous power control theory and cost function based on instantaneous power model. The control system was presented in this paper,for the purpose of simplify structure and improving static and dynamic performance and reducing jitter and control error,which generated due to switching frequency limitation.Simulation results show that the proposed control theory is correct and effectively.