A Composite Variable Structure PI Controller for Sensorless Speed Control Systems of IPMSM

Weidong Feng, Jing Bai (), Zhiqiang Zhang and Jing Zhang
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Weidong Feng: College of Electrical and Information Engineering, Beihua University, Jilin 132013, China
Jing Bai: College of Electrical and Information Engineering, Beihua University, Jilin 132013, China
Zhiqiang Zhang: Power Supply Company, Baotou 014000, China
Jing Zhang: College of Electrical and Information Engineering, Beihua University, Jilin 132013, China

Energies, 2022, vol. 15, issue 21, 1-18

Abstract: In the speed control system of an Interior Permanent Magnet Synchronous Motor (IPMSM) without a speed sensor, PI controllers using only a fixed set of parameters cannot achieve accurate tracking of the estimated speed in a wide speed domain and also suffer from step response overshoot. This paper proposes a Compound Variable Structure PI (CVSPI) controller to improve the system control performance. It can choose whether to include an integral term according to the size of the system deviation to speed up the response. It also introduces a Model Reference Adaptive System (MRAS) speed observer in the controller to estimate the speed and adaptively adjust the size of the anti-integration saturation gain to improve the dynamic response following performance and immunity of the system. A feed-forward link is added for a given input differential to achieve an accurate answer to time-varying inputs. As the linear compensation matrix of the conventional MRAS is a unit matrix, the speed can only be accurately observed in a specific speed range. In this paper, a new linear compensation matrix is designed, and a new speed adaptive law is derived, allowing the improved MRAS to measure speed over a wide range accurately. Simulation results validate the excellent control performance of the CVSPI and the accuracy of the enhanced MRAS over a wide speed range.

Keywords: composite variable structure PI; interior permanent magnet synchronous motor; improved MRAS (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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