感应电机低采样频率的磁链观测器离散化模型研究  

Improved Discrete Observer Model of Induction Motor at Low Sampling Frequency

作　　者：李杰[1] 詹榕 宋文祥[2] Li Jie;Zhan Rong;Song Wenxiang(School of Science and Engineering,Shanghai Open University,Shanghai,200433,China;School of Mechatronic Engineering and Automation,Shanghai University,Shanghai,200072,China)

机构地区：[1]上海开放大学理工学院,上海200433 [2]上海大学机电工程与自动化学院,上海200072

出　　处：《电工技术学报》2019年第15期3136-3146,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51377102)

摘　　要：针对在高速运行区域感应电机全阶磁链观测器的一阶欧拉离散化模型的不稳定问题,该文提出一种基于不同参考坐标系下的改进磁链观测器离散化模型。以定子磁链和转子磁链为状态变量,根据电机静止坐标系下的定子方程与转子坐标系下的转子方程,利用离散化状态矩阵对方程进行转换处理,并设计反馈矩阵进行观测器极点配置,从而实现电机磁链状态的稳定观测。改进磁链观测器离散化模型的极点轨迹位于稳定区域内,全速度区域内的模型稳定。最后,通过系统仿真与实验,验证了改进磁链观测器离散化模型的正确性和有效性。Aiming at the limitations of the model of the Full-order observer using first-order Euler with full speed range,that is,the discretization model is unstable when operating at high speed,an improved discrete observer model based on different reference frame is proposed.The model is based on the rotor equation in the rotor reference frame,with the stator equation in the stationary reference frame.Considering the stator flux and rotor flux as the state variable,a discretized state matrix is used to convert the equations by designing the feedback matrix for pole placement,thus the stable observation of flux can be realized.The stability of the improved discrete observation model can be proved by the stability theory of discrete domain.The root locus plot of the model is in the stable region to achieve stability within the whole-speed range.Finally,both the simulation and experiment results demonstrate the correctness and effectiveness of the proposed method.

关 键 词：感应电机 磁链观测器 低采样频率 离散化模型 极点 

分 类 号：TM343[电气工程—电机]