Grid Resilience Enhancement through TPTL NPC Inverter-Based Shunt Active Power Filters with Dual Fundamental Component Extraction
Alok Ranjan, Devara Vijaya Bhaskar
Abstract
The extensive use of nonlinear loads in power distribution systems has led to significant concerns about power quality. Therefore, this article emphasizes the generation of accurate sinusoidal reference currents to effectively reduce harmonics and maintain sinusoidal current, even under non-ideal grid voltage conditions. Furthermore, a time domain-based algorithm for generating reference currents to minimize dc-link voltage deviation in the TPTL NPC-based SAPF. The suggested algorithm concurrently extracts the necessary fundamental current and voltage components in order to generate reference current and synchronization phases. Consequently, this algorithm can produce reference currents that ensure the SAPF operates in phase with the system, without relying on PLL. The efficacy of the presented algorithm has been comprehensively examined and assessed using MATLAB-Simulink. The suggested control scheme has also been validated experimentally, with results indicating satisfactory overall system performance even when subjected to changing load scenarios.