Comparative Analysis of the Methods Used for Active Power Filtering in a Grid-Connected Photovoltaic System

This paper presents a comparison of the results obtained from the integration of the photovoltaic system to the electrical grid through the Active Power Filter. The innovative aspect of this article consists of the elaboration of 4 models in Matlab/Simulink for 4 methods of control of the Active Power Filter introduced between the photovoltaic system and the alternating current grid and the highlighting of the performances obtained regarding the quality and quantity of electricity transferred for each control method in part. Following the analysis of the results, it was found that by using the Indirect Control (CI) method of the Active Power Filter, the best results are obtained THDu = 3.24%, THDi = 2.46% if the photovoltaic system produces a larger amount of energy than the nonlinear load, and by using the methods of control of the Active Power Filter Synchronous Reference Frame (DQ) and Instantaneous Power (PQ) the best results are obtained: THDu = 3.22%, THDi = 5.26% for the method (DQ) and THDu = 3.41%, THDi = 5.17% for the method (PQ) if the photovoltaic system produces a smaller amount of energy than the nonlinear load.