SMALL SIGNAL STABILITY ANALYSIS OF GRID CONNECTED WITH VARIOUS SOLAR PHOTOVOLTAIC PENETRATION LEVELS AT DIFFERENT LOAD AND REACTIVE LOAD LEVELS

Abstract

The utilization of fossil fuels at an alarming rate has brought adverse effects on the environment and have accelerated the need for the development of alternative renewable energy resources. This dissertation primarily focuses on the small signal stability analysis of a power system integrated with solar photovoltaics (PV). The test systems utilized in this study are a small and large scaled power system which is the IEEE 9-bus and 39-bus power system respectively. The small signal stability of the test systems is broken down and examined in terms of eigenvalue analysis, damped frequency, damping ratio and participation factor. Different states are analyzed in this study which consist of the effects of incremental solar PV penetration into the systems, load variation and reactive load variation. For incremental solar PV penetration, the results observed indicate that there are no significant adverse impacts of solar PV penetration on the small signal stability of both the small and large scaled power systems. When the overall load and reactive loads are increased, no significant impact is observed on small signal stability and the power systems still remained in a stable state. The software used in this study is DigSILENT Powerfactory.