Shunt active power filter with extended-fryze adaptive notch filter and weightage-based particle swarm optimization proportional integral controller

The integration of Shunt Active Power Filters (SAPF) into electrical power systems is pivotal for mitigating current harmonics, which pose numerous quality challenges. A critical aspect of SAPF lies in the implementation of harmonics or fundamental extraction algorithms, necessitating quick and precise current generation of harmonic references to ensure effective compensation. While Adaptive Notch Filter (ANF) offers a method for signal extraction, its application in three-phase systems especially in the utilization of SAPF is limited particularly due to the absence of direct DC-link controller utilization.. Consequently, this research introduces an enhanced version termed as Extended Fryze ANF (EFANF) within the SAPF, specifically designed for fundamental signal extraction across single-phase and three-phase applications, while incorporating a DC-link voltage regulation controller based on the Fryze power-loss equation. This novel extraction algorithm boasts simplified design construction, frequency tracking, and eliminates reliance on phase-locked loop (PLL) synchronization. Balancing energy between the DC link voltage and filter current is paramount in SAPF development, commonly achieved through Proportional-Integral (PI) controllers. Despite their simplicity, PI voltage regulators suffer from time-consuming trial-and-error tuning. In response, an optimization method utilizing Weightage-Based Particle Swarm Optimization (WBPSO) is proposed, enabling the acquisition of optimal Kp and Ki values tailored to the controller's requirements. The integration of EFANF with an optimized PI controller is expected to elevate SAPF's dynamic performance, maintain requisite voltage levels via the DC-link, and minimize total harmonic distortion (THD). The efficacy of both algorithms is validated through comprehensive simulation using MATLAB/Simulink and experimental execution on DSpace RS1104, demonstrating satisfactory harmonic mitigation across diverse multi-load conditions. The results indicate THD reduction below 5%, in adherence to IEEE 519TM-2014 standards, affirming algorithmic functionality in steady and transient state conditions. Furthermore, the algorithm effectively tends to maintain the DC link capacitor voltage based on the reference voltage throughout the changes of multi-loads conditions, underscoring its holistic impact on SAPF efficacy within electrical power systems. Hence, it can be concluded that the proposed algorithms have successfully performed their functions by effectively enhancing the operation of the SAPF.

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