Abstract
This paper presents a low-rated midpoint DC-link capacitor hybrid shunt active power filter (HSAPF) embedded with sliding window (SW) based harmonic detection method for power quality enhancement in a medium-voltage distribution network. The novel composite current control technique utilizes SW based high pass filtering for determining the reference voltages, SW based low pass filtering for absorbing the negative sequence currents of 5th order harmonic. In this study, an additional effort has been made to evaluate the compensation effect of the HSAPF system by using a combinational adaptive linear neural network and dynamic forgetting factor recursive least squares (RLS) (ADALINE-DFFRLS) algorithm. Due to the utilization of dynamic forgetting factor (DFF) mechanism, the DFFRLS based weight updating rule shows faster and accurate estimation results in noisy environments compared to the conventional RLS. The performance of the proposed ADALINE-DFFRLS estimation algorithm is compared with the ADALINE-RLS to exemplify its faster-tracking capability. Extensive simulation is carried out to show the compensating performance of the HSAPF system employing SW based proposed controller under different critical conditions. Additionally, an experimental setup is developed for validation of the proposed control strategy in the real-time using a Spartan 3A DSP processor.
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