Intelligent hybrid control of a five-level shunt active power filter for power quality enhancement in renewable-rich power systems
Year: 2026
Type: article
Abstract: The increasing penetration of renewable energy sources and power electronic converters in modern distribution networks has introduced significant harmonic distortion and power-quality challenges, particularly in converter-dominated systems. These distortions degrade the system efficiency, reduce the equipment lifespan, and compromise the stability of sensitive loads. This study proposes an intelligent hybrid control strategy for a five-level shunt active power filter (SAPF) to enhance the power quality under nonlinear load conditions. The proposed framework integrates fuzzy logic-based DC-link voltage regulation, adaptive hysteresis current control with quasi-constant switching frequency, and space vector pulse width modulation (SVPWM) for optimized switching vector generation. The control algorithm was implemented on a digital signal processor (DSP), specifically the Texas Instruments TMS320F28335, and validated through both MATLAB/Simulink simulations and real-time experiments. The results demonstrate that the total harmonic distortion (THDi) of the source current was reduced from 18.67% to 5.04%, achieving compliance with the IEEE Std. 519. In addition, the proposed method exhibits a fast dynamic response, stable DC-link voltage regulation, and reduced switching frequency variation. Comparative evaluation confirms that the hybrid control approach outperforms the conventional proportional–integral and fixed-band hysteresis controllers in terms of harmonic mitigation and system stability. These findings highlight the effectiveness and practical applicability of the proposed SAPF in renewable-rich, converter-dominated power systems.
DOI: 10.18686/cest774
Language: English
Topic: Power Quality and Harmonics
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7161816798