《低定子频率下消除电流测量误差的磁链观测器》.pdf

2011 年 6 月 电 工 技 术 学 报 Vol.26 No. 6 第 26 卷第 6 期 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Jun. 2011 低定子频率下消除电流测量误差的 磁链观测器 周二磊 符 晓 伍小杰 戴 鹏 （中国矿业大学信息与电气工程学院 徐州 221008 ） 摘要 随着控制性能要求的提高，电流测量误差对电励磁同步电动机控制性能的影响愈加显 著。从电流测量路径看，产生误差不可避免，直流偏移和比例不平衡误差会造成转速周期性地波 动。本文采用一种简单的谐振式观测器对低定子频率下存在的电流测量误差进行补偿，并且为了 消除残余误差，纯积分磁链观测器采用了残余误差补偿器以精确观测磁链。最后，基于 Matlab/Simulink 对电流两相传感器的电励磁同步电动机调速系统进行仿真，仿真结果证明了该方 案的有效性。 关键词：电流测量误差 谐振式观测器 纯积分磁链观测器 电励磁同步电动机 中图分类号：TM341 Flux Observer for Elimination of Current Measurement Error at Low Stator Frequency Zhou Erlei Fu Xiao Wu Xiaojie Dai Peng （China University of Mining and Technology Xuzhou 221008 China ） Abstract As higher performance of control system is required, current measurement error seriously affected the control performance of electrically excited synchronous motor. The errors generated from the current measurement path are inevitable, such as offset currents and gain deviations, which causes the periodic rotor speed ripples. This paper presents a simple resonant type observer to compensate current measurement errors for the pure-integration-based flux estimation at a low stator frequency. The technique further contains a residual error compensator to eliminate miscellaneous residual error of the integrator. Finally, this paper uses the Matlab/Simulink to simulate excited synchronous motor with two phase current sensors. The simulation results show the effectiveness of the proposed scheme. Keywords ：Current measurement error, resonant type observer (RTO), pure integration based flux acquisition, electrically excited s