Quasiproportional‐Resonant‐Compensator‐Based DC‐Link Stabilization of In‐Front Zeta Converter Allied to Mitigate Current Ripples in BLDC Motor Drives

Brushless DC motor (BLDCM) drives often experience significant current and torque ripples, which negatively affect the overall performance. Moreover, the dynamic characteristics of BLDCMs such as low mechanical oscillations and tight speed regulation can introduce undamped AC components that destabilize the DC‐link supply (DCLS). This study presents a novel compensation strategy to address DCLS instability in BLDCM drives. A quasiproportional‐resonant compensator (QPRC) is proposed to enhance DCLS stability. This paper explores a QPRC‐based stabilization approach for the DCLS in an in‐front zeta converter (IFZC)–assisted BLDCM drive. The IFZC is mainly employed for voltage regulation while the QPRC is integrated to suppress the undamped AC signals in the DC link. A hardware prototype has been developed to validate the proposed control strategy. Experimental results confirm that the suggested stabilization strategy effectively enhances DC‐link stability and improves the overall performance of the BLDCM drive.