Performance Analysis of Multifunctional Grid Integrated PV based Distributed Generation

Abstract

Distributed generation (DG) has received more attention due to the limitations of centralized power plants. The DG system is able to supply more efficient, good quality, and reliable power to grid which is required for uninterrupted services. In a DG system, different renewable energy sources (RES) are used wherein the grid-connected inverter is typically used to interface a RES to the utility grid. This project work focuses on understanding the performance of two-level and three-level inverter based DG supplied from PV array, integrated with the grid. The proposed DG performance is analyzed for active as-well-as reactive power exchange with the grid. Impact of DG on the grid during the fault conditions is also studied. Photovoltaic (PV) array is used as DG source with maximum power point tracking (MPPT) implemented with perturb & observe (P&O) algorithm. In this project work for the control of proposed DG system comprehensive power quality evaluation (CPQE) technique and space vector modulation (SVM) based hysteresis current controller (HCC) is used to obtain it’s multi-functionality such as supply of active power, compensation of reactive power and mitigate the current harmonics present at point of common coupling (PCC). Here, MATLAB based simulation is performed for MPPT and output is observed for maximum power extraction for various irradiation levels. MATLAB based simulation analysis is performed on proposed photovoltaic based multi-functional grid connected two-level inverter (PV-MFGCI) and three-level T-type neutral point clamped (T-NPC) inverter based DG. Analysis of the system behavior for different types of faults is carried out and appropriate voltage compensation by proposed DG under these conditions of faults is depicted through simulation results.