感应电机新型自适应矢量控制极低速与零速稳定性研究  

Research on Very Low and Zero Speed Stability of Vector Control at the New Adaptive Law of Induction Motor

作　　者：李娟 卢子广[1] LI Juan;LU Ziguang(College of Electrical Engineering,Guangxi University,Nanning 530004,Guangxi Zhuang Autonomous Region,China)

机构地区：[1]广西大学电气工程学院,广西壮族自治区南宁市530004

出　　处：《中国电机工程学报》2023年第16期6474-6483,共10页Proceedings of the CSEE

基　　金：广西自然科学基金重点项目(2018GXNSFDA138008)。

摘　　要：基于传统转速自适应律全阶观测器的感应电机无速度传感器矢量控制在极低速和零转速情况下不稳定的问题,该文提出新的反馈增益矩阵和新型转速自适应律的设计方法。逆变器非线性电压误差和定子电阻参数变化是造成电机极低速和零速不稳定的根本原因,其导致定子励磁电流误差增大,进而影响转子磁链误差增大,最终致使忽略磁链误差项的传统转速自适应律不再适用。因此,尽可能减小励磁电流误差和设计新型转速自适应律是确保感应电机极低速和零转速稳定的关键。通过添加数学公式上励磁电流误差项为零限制基于励磁电流误差收敛设计的反馈增益矩阵;并且推导出相比传统转速自适应律下的无近似和省略部分的新型转速自适应律,从而达到在改良后的全阶磁链观测器和新型转速自适应律下感应电机矢量控制全速度稳定的效果。通过3.7kW感应电机的dSPACE控制实验平台对该方法进行验证,该方法在额定负载条件下极低速和零转速下能稳定运行,表明该方法具有很好的稳态和动态性能。The speed-sensorless vector control of induction motor based on the traditional speed adaptive law full-order observer is unstable at very low and zero speed.This paper proposes a new feedback gain matrix design method and a new speed adaptive law.The nonlinear voltage error of the inverter and the stator resistance parameter change are the fundamental reasons for the instability of the motor at very low and zero speed,which leads to the increase of excitation current error,and in turn affects the increase of the rotor flux linkage error.As a result,the traditional speed adaptive law ignoring the flux linkage error term is no longer applicable.Therefore,reducing the excitation current error as soon as possible and designing a new speed adaptive law are the key to ensuring the stability of the induction motor at very low speed and zero speed.The feedback gain matrix designed based on the convergence of the excitation current error is limited by adding the excitation current error term to zero in mathematical formula;and a new speed adaptive law without approximations and omitted parts is deduced compared to the traditional speed adaptive law,so as to achieve the full-speed stability effect of the induction motor vector control under the improved full-order flux linkage observer and the new speed adaptive law.The method is verified by using the dSPACE control experiment platform of a 3.7kW induction motor,which could operate stably at the very low and zero speed at the rated conditions.It shows that the method has good steady-state and dynamic performance.

关 键 词：感应电机 无速度传感器 极低速稳定性 新型转速自适应律 励磁电流误差 

分 类 号：TM921[电气工程—电力电子与电力传动]