THD Mitigation in Parallel Voltage Source Converters Through Fuzzy Logic Control and SVPWM Technique

This paper aims to design and analyze the performance of parallel voltage source converters (VSCs) using space vector pulse width modulation (SVPWM) topology and to control the output voltage and current of the VSCs using PI and fuzzy logic controllers (FLCs). The project studies the performance of the parallel VSCs with SVPWM in terms of total harmonic distortion (THD). The proposed SVPWM technique is grounded in recent advances in fuzzy logic optimization methods, known for their suitability in solving multi-objective problems. Utilizing fuzzy logic, the technique aims to determine optimum firing angles that minimize harmonic content. The system includes parallel VSCs, RL load, LC filter and grid. The methodology entails the simulation of parallel VSCs utilizing SVPWM topology in MATLAB/Simulink, introducing FLCs into the simulation, and subsequently evaluating the parallel VSCs' performance under SVPWM topology. Additionally, the stability and robustness of the parallel VSCs, integrating both SVPWM and FLCs, are systematically analyzed. The findings reveal that employing FLCs for controlling the output voltage and current in parallel VSCs leads to a notable reduction in THD compared to conventional control methods lacking optimization methods. Comparative assessments are conducted between the performance of parallel VSCs utilizing the SVPWM technique and FLCs versus SVPWM methods without optimization technique, with a thorough analysis of stability and robustness.