DPC-SVM Controlled Strategy for a Three-Level Shunt Active Power Filter Grid Connected Photovoltaic System Optimized by Super Twisting Sliding Mode Technique

Abstract

This study presents a photovoltaic system consisting of a photovoltaic generator (PVG) connected to a DC-DC Boost converter, this last is coupled to a three-phase electrical network via a three-phase three-level shunt active power filter (SAPF), which is used to achieve these objectives: improve the power factor, reduce the THD factor, injecting the power supplied by the (PV) system into the non-linear load and compensating the reactive power. On the other hand, the direct power control strategy associated with the space vector modulation (DPC-SVM) applied to the three-level (NPC) shunt active power filter (SAPF), facilitates the control of the energy system supplied by the PV system and make it in synchronization with the electrical grid. Parameters of the SAPF controllers are determined by proportional-integral with anti-windup compensation of the dc-link voltage-loop and powers loop controller. The extraction of the maximum power of the PV generator is based on the super twisting second-order sliding mode controller (STC-SMC). The developed model and the control strategies are validated using Matlab/Simulink environment and the simulation results demonstrate the robustness and the feasibility of the proposed technique.