An Accurate Harmonic Current Suppression Strategy for DC-Biased Vernier Reluctance Machines Based on Adaptive Notch Filter

Abstract

This paper proposes an accurate harmonic current suppression strategy for DC-biased VRMs based on adaptive notch filter (ANF) to reduce torque ripple and power loss. A new harmonic reference frame (HRF) is proposed in dq-axis and combined with ANF, thus harmonic currents are accurately extracted and analyzed. Furthermore, a phase shift strategy is proposed for DC-biased VRMs, realizing precise compensation of harmonic voltages. The proposed ANF based harmonic currents suppression strategy has a better performance in harmonic suppression and dynamic response and is suitable for a wider speed range in comparison with traditional harmonic suppression control strategy. Whats more, the parameter design of the proposed method is easier compared with traditional method. Finally, the conclusions are verified by experimental results.