Transient Stability Analysis of Grid Connected Photovoltaic System

Abstract

In late years, lack of adequate transmission capacity, limitation in constructing new transmission lines, growing demand of customers and emerging electricity market have contributed to the use of Distributed generation, in the form of small or large DG. Many of the DG are renewable sources of electric generation and thus helps in mitigation of the adverse environmental impacts. Solar Energy is one of the major alternative sources of vitality. There has been a considerable addition of electricity generation from solar energy conversion system in later years. Most of the photovoltaic plants are grid connected. The solar array at different insolation level has been materialized. To achieve maximum power a circuit has been developed in order to trace the maximum power of the system. The process of extracting the maximum power from the terminal voltage is called maximum power tracking (MPPT). In this thesis, a high rated power array (600MW) have been considered for integration at the 3-phase lines of 220kV, using two stage configuration (DC-DC boost converter and DC-AC converter). The DC-DC converter has been used to boost the voltage and ensuring the MPPT of the PV array. The controllers for grid connected photovoltaic have been developed using PI method. As the system is grid connected there are many chances of occurring faults in the sys- tem, transient faults are likely to occur in the system. The GCPS transient response to grid faults and varying atmospheric condition has been materialized. A grid connected photovoltaic system with its transient analysis has been carried out in PSCAD X4(v4.5.1) software and analysis of the same is carried out.