基于电流优化的无速度传感器感应电机零频穿越策略  

Current Optimization-Based Zero Frequency Ride-Through Method for Speed-Sensorless Induction Motor Drives

作　　者：罗成[1] 李孺涵 杨凯[1] 徐智杰 郑逸飞 Luo Cheng;Li Ruhan;Yang Kai;Xu Zhijie;Zheng Yifei(School of Electrical and Electronic Engineering Huazhong University of Science and Technology,Wuhan 430074 China)

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074

出　　处：《电工技术学报》2022年第19期4947-4956,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(52237002,52207055);国家电网总部科技项目(5100202222010A11ZN)资助项目。

摘　　要：无速度传感器感应电机在低频区运行时,转速可观测性较差。特别是在定子零频工况时,转速不可观测。为此,该文提出了一种基于电流优化的无速度传感器感应电机零频穿越策略。首先,推导观测转速与转速误差的传递函数,证明零频工况下转速不可观测的根本原因;其次,介绍所提出零频穿越策略的原理,并对典型工况电机运行点的变化进行分析,保证在低定子频率下的转速可观测性;此外,为了在零频穿越过程中获得最优电流,提出一种主动零频穿越边界点电流轨迹优化方法,结合转矩、电流和可观测性等限制条件,将转速能观性和最小定子电流作为优化目标,推导出主动零频穿越边界点优化选择方法;最后,在2.2kW的感应电机实验装置上验证所提方法的有效性。When speed-sensorless induction motor(IM) drives are operated in low frequency region, the speed observability will be poor. Particularly, the rotor speed cannot be observed at zero stator frequency. Addressing this problem, a current optimization zero frequency ride-through(CO-ZFRT)method is proposed for speed-sensorless IM drives(SSIMD) in this paper. Firstly, the transfer function of the estimated speed to the estimated speed error is derived, indicating the root cause of the speed unobservability at zero stator frequency. Secondly, the implementation of CO-ZFRT is derived by adaptively modifying the magnetizing current to ensure the observability of speed at low stator frequency,following with the analysis on operating point changes. In addition, a current optimization method is proposed for boundary points selection of active zero frequency crossing to obtain the optimal current performance. Combining the constraints of torque, current and observability, the speed observability and the minimum stator current are taken as the additional optimization objectives to derive the active zerofrequency crossing boundary points. Finally, the effectiveness of proposed method is verified on a 2.2kW IM experimental setup.

关 键 词：感应电机 无速度传感器控制 零频穿越 电流优化 

分 类 号：TM346[电气工程—电机]