Improving Dynamic Response of Active Harmonic Compensator Using Digital Comb Filter

Harmonic extraction and control is one of the main elements in active power filter design. The advances in the digital signal processor (DSP)-based control have facilitated the use of sophisticated filters and control techniques to achieve better dynamic performance, which was difficult earlier with the use of analog design. To improve the dynamic response of the active harmonic controller, we propose a comb-filter-based solution, which can be implemented on a DSP platform. Performance evaluation results for the load transient show a substantial improvement in the dynamic performance of the harmonic compensator compared with the conventional low-pass-filter-based approaches.