Performance Analysis of an LCL Filter with Active Damping and Resonant Control for Grid-Connected Inverter

Resumo

The growth of Distributed Generation (DG) from renewable energy sources significantly impacts the operation of electrical power systems. To enable the efficient integration of these sources into the electrical grid, inverters play a fundamental role by converting direct current (DC) into alternating current (AC). This study aims to present a simplified design project, implemented and tested through simulations in the MATLAB Simulink environment. The goal is to make resonant control techniques and active damping through capacitor current feedback more accessible and easier to understand, as well as to evaluate and demonstrate the effectiveness of the proposed methods, enabling their practical application. The results obtained showed that the control techniques employed are essential to ensure stability and power quality in inverters with LCL filters. The methodology was presented in a clear and objective manner, facilitating understanding. The simulations highlighted the reduction of the resonance peak, the effective control of the current injected into the grid, and low THD values, confirming the feasibility of applying these techniques in renewable energy systems connected to the electrical grid.