摘要
对于无速度传感器异步电机控制系统,反馈矩阵理论上可以减小系统发电运行不稳定区域,改善低速发电工况下的转速观测性能。然而,由于电机参数误差,现有控制策略无法在低定子电流频率下实现理想的稳定性目标。针对这个问题,该文提出一种基于多误差项协同的反馈矩阵设计方法,提高系统对电机参数误差的鲁棒性,并提升转速观测的稳定性。首先,该文提出一种基于多误差项解耦的磁链误差在线观测方法,分析并设计了磁链误差权重系数。其次,在观测器反馈矩阵设计中引入电流误差项,实现电流误差项与磁链误差项的协同设计。在此基础上,将误差矢量系数矩阵行列式重构为抛物线函数,通过引入常数项满足系统稳定的必要条件,解决传统反馈矩阵设计方法对电机参数变化敏感的缺陷,提高观测器对参数误差的鲁棒性。在低定子电流频率下,所提方法可以在低速发电区域实现稳定的转速观测。最后,在2.2 kW异步电机平台上验证了所提方法的有效性。
The speed-sensorless induction motor drives(SSIMD)technique possesses high reliability,easy maintenance,low cost,and is adopted broadly.High performance of the SSIMD system relies on the precise rotor speed information.Recently,several papers have been reported to realize speed estimation as accurate as possible.For the SSIMD control system,the feedback matrix of the adaptive full-order observer(AFO)can theoretically reduce the unstable regenerating region,and improve the speed estimation performance in low-speed regenerating mode.However,the desired performance of existing methods deteriorates at low stator frequencies due to parameter uncertainties.The boundaries of the unstable region cannot coincidence with the inevitable parameter uncertainties.Actually,most of existing methods ignore the flux error,which is unable to be observed directly by instruments.Then the necessary conditions of the SSIMD control system cannot be satisfied at the low-speed regenerating mode.To solve the problem above,this paper proposes a feedback matrix design method.To design and select the robust feedback in SectionⅢ,a flux error online estimate method is introduced in SectionⅡbased on decoupling error terms.Existing literature points out that both the stator current error and the rotor flux error are composed of stator resistance error,rotor resistance error,and rotor speed error.Hence,the expression of the flux error can be obtained by the decoupling analysis.To determine the weight coefficients,variations of ratios N1 and N3 against different synchronous speeds and torque currents are presented.Then the weight coefficients can be selected appropriately.Introducing the flux error into the feedback matrix design,the mathematical model and the block diagram of the control system with the proposed feedback matrix design are given in SectionⅢ.To realize the necessary conditions of the SSIMD,the stability function of the AFO is reconstructed as a parabola.The function maximums and the robustness improvement design are discussed
作者
杨凯
李孺涵
罗成
徐智杰
郑逸飞
Yang Kai;Li Ruhan;Luo Cheng;Xu Zhijie;Zheng Yifei(School of Electrical and Electronic Engineering Huazhong University of Science and Technology,Wuhan 430074 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第21期5738-5748,5820,共12页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(52237002,52207055)
中国博士后科学基金(2022M721232,2023T160243)
湖北省重点研发计划(2022BAA097,2022BAA100)资助项目。
关键词
异步电机
无速度传感器控制
参数误差
自适应全阶观测器
Induction motor(IM)
speed-sensorless control
parameter errors
adaptive full-order observer
