基于转子磁链观测器的五相容错PMSM开路故障下的无位置传感器控制  

Rotor-Flux Observer Based Sensorless Control of Five-Phase Fault-Tolerant PMSM with Open-Circuit Fault

作　　者：周华伟[1] 叶晨 陈铖 张多[1] 陈前[1] Zhou Huawei;Ye Chen;Chen Cheng;Zhang Duo;Chen Qian(School of Electrical and Information Engineering Jiangsu University,Zhenjiang 212013 China)

机构地区：[1]江苏大学电气信息工程学院,镇江212013

出　　处：《电工技术学报》2023年第2期422-434,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51877100);江苏高校“青蓝工程”项目资助。

摘　　要：五相容错永磁同步电机(PMSM)开路故障模型的不对称性,影响了其无位置运行性能。该文提出一种基于转子磁链观测器的无位置控制策略。首先,该策略在容错模型基础上,构建基于指数趋近律的滑模观测器(SMO)以获取反电动势信号;其次,为抑制所观测反电动势中直流偏置、低频和高频谐波对转子位置观测精度的影响,设计一种改进型二阶广义积分器(ISOGI),并将其和SMO级联构成转子磁链观测器;然后,采用锁相环技术从转子磁链中提取转子位置信息;最后,将该转子磁链观测器和容错控制策略相结合。实验结果表明,该策略提高了转子位置观测精度,实现了PMSM开路故障下的无位置高性能运行。Due to the asymmetric state of the five-phase fault-tolerant permanent magnet synchronous motor(PMSM)under open-circuit fault conditions,the operating performance with sensorless control is not satisfied.The estimated accuracy of rotor position deteriorates since the back electromotive forces(EMFs)estimated by traditional observers contain DC bias and high-order harmonics under open-circuit fault conditions.Therefore,a novel sensorless control strategy based on a rotor-flux observer was proposed.Firstly,based on the fault-tolerant model,a sliding mode observer(SMO)according to the exponential approach law was established to estimate back electromotive forces(EMFs).However,they contain dc bias,and low and high-order harmonics,which seriously affect the estimated accuracy of rotor position.Secondly,an improved second-order generalized integrator(ISOGI)was designed.The ISOGI transfer function can be expressed as Ψ_(rs)(s)/V_(s)(s)=k_(1)s^(2)/s^(2)+k_(1)ω_(r)s+ω_(r)^(2)·k_(2)ω_(r)/s^(2)+k_(2)ω_(r)s+ω_(r)^(2)Q_(s)(1)Combined with the SMO,the ISOGI was adopted to design a new rotor-flux observer.Then,a phase-locked loop(PLL)extracted the rotor position information from the rotor flux.Finally,the faulty PMSM can operate smoothly with a fault-tolerant method.Simulated results on the parameter robustness show that when the resistance,inductance,or permanent magnet flux becomes 0.5 and 2 times the actual parameters,the estimated errors of position and speed are almost unchanged.Thus,whether the parameters become larger or smaller,the estimated errors are almost the same as those under healthy conditions.An experimental platform was estimated to verify the feasibility and effectiveness of the proposed strategy.Steady-state experiments show that the maximum rotor position errors estimated by the SMO+SOGI and SMO+ISOGI are 0.55rad and 0.22rad,respectively.When reference speed changes,the maximum speed regulation time with the SMO+ISOGI strategy is 0.5s,while the SMO+SOGI strategy is 0.55s.When loads change,the maximum

关 键 词：永磁同步电机 开路故障 滑模观测器 改进二阶广义积分器 转子磁链观测器 

分 类 号：TM351[电气工程—电机]