Performance Analysis of Voltage Source Inverter-Based Grid-Connected Photovoltaic Power Plants with Ride-Through Capability under Grid Faults

Abstract

The voltage source inverter (VSI) topology is widly used for grid interfacing of distributed generation (DG) system when employed in photovoltalic (PV) systems VSI normally required another single and two stage inverter to step up the voltage by adding to the cost and complexity of the system which makes the proliferation of grid connected pv systems which is an economically successful business option with respect to performance and life expectancy of the power electronic interfacing that need to be improved. The VSI in terms of inherent boosting and short circuit protection capability including the direct output current controlled and ac side simpler filter structure. The research on VSI based DG is still in its development stage where the paper focuses on modeling controlling and steady state transient performances of a PV system based on VSI by performance a comparative performance evaluation of VSI based PV system under transient and fault condition with the analytical expectations are being verified under different condition 1) excessive dc-link voltage; 2) excessive ac currents; and 3) loss of grid-voltage synchronization. In this paper, the control of single- and two-stage grid-connected VSIs in photovoltaic(PV) power plants is developed to address the issue of inverter disconnecting under various grid faults.