volume | PIER Journals

Abstract

To reduce the cost and improve the accuracy of position estimation for switched reluctance motors (SRMs) at medium to-high speeds, this study proposes a sensorless control strategy based on a dual-stage resonant filter (DSRF) and a feedforward phase-locked loop (FPLL). First, to address issues of weak dc-offset suppression and high-frequency harmonics in the second-order generalized integrator (SOGI) when processing nonlinear flux linkage, a DSRF with ideal band-pass characteristics is proposed. This filter effectively suppresses the dc-offset and higher-order harmonics. Second, the proposed FPLL introduces a feedforward compensation path related to the speed derivative. By adding zeros to broaden the system bandwidth, the dynamic response is accelerated. The tracking accuracy and response speed of the position observer are also enhanced under variable-speed and sudden-load conditions. Finally, the effectiveness of the proposed strategy was verified on a six-phase 12/10 SRM experimental platform. The experimental results show that the proposed sensorless control strategy achieves a fast and highly accurate estimation of the rotor position and speed at medium to-high speeds, particularly during dynamic processes, thereby enhancing system reliability and dynamic performance.

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Mr. Zheng Zhang

Professor Zebin Yang

Professor Xiaodong Sun

Dr. Chao Sun