QPRC-Based DC-Link Stabilization of IFZ-Converter Applied to Suppress CCR in BLDCM Drives

The brushless dc motor (BLDCM) drives are adversely affected by commutation current ripple (CCR), which leads to increased torque ripple and degraded performance. The DC-DC converter based-BLDCM drive topology is widely preferred to suppress CCRs. The improved characteristics such as low mechanical oscillation and stiff-speed regulation of BLDCM drives further introduces undamped AC signals termed as switching frequency harmonics (SFH) which results destabilization of DC-link voltage (DCLV). The different breeds of filter techniques have been recommended to stabilize the DCLV. However, the recommended filters are composed on the basic of concept of low pass filter (LPF) or band-pass filter (BPF). In addition, these filters require a precise coordination with active compensation, current reference and nonlinear interaction. In this context, a quasi-proportional-resonant-compensator (QPRC) has applied to stabilize the DCLV. The QPRC is investigated for an in-front zeta converter (IFZC) assisted-BLDCM drive. The IFZC primarily handles voltage regulation, while the QPRC is incorporated to suppress the SFH of the DCLV. A hardware prototype has been developed, and experimental results are presented to validate the effectiveness of the proposed stabilization strategy and design. The suggested compensation technique effectively stabilized the DCLV and improves the overall performance of the BLDCM drive.