Voltage Fluctuation Suppression Strategy for DC - biased Vernier Reluctance Generator based on the Third-order Zero Sequence Current Injection

This article proposes a control strategy for the third-order zero sequence current injection to reduce voltage fluctuations in DC-biased vernier reluctance generator (DC-biased-VRG). Firstly, the mathematical model of the motor is analyzed, and the expression of the motor's torque and the cause of harmonic generation are derived. It is found that the DC-biased-VRG torque contains third-order harmonic, which leads to the DC voltage output by the inverter containing third-order harmonic. By injecting the third-order zero sequence current and optimizing the amplitude and phase of the third-order harmonic current, the third-order harmonic term of the voltage is suppressed. The experimental results have shown that the proposed the third-order zero sequence current injection control strategy can effectively reduce the fluctuation of DC voltage and the content of third-order harmonic of voltage.