Study of small–signal stability of a renewable integrated power system using a dynamic phasor approach

Abstract

The transition trend towards renewable energy in the modern world shows a rapid increment of renewable power sources in electrical power systems. Wind energy and solar energy can be considered as the leading energy sources nowadays. These renewable power plants have several power electronic interfaces, and they introduce more complex dynamics to the power system. A comprehensive evaluation is required to identify significant changes in the power system due to these changes. This study provides a detailed examination of the outcomes of introducing renewables to power systems with a significance on its effect on small signal stability and the complex dynamics arising from varying penetration levels of renewable energy sources are explored in-depth, providing a comprehensive understanding of their impact on the stability of the system. This research also revealed the significance of accounting for the network dynamics which are overshadowed in constant admittance network modeling to this study. This research deeply explores the complex mathematical representations of the power system with two types of network modeling techniques and to ensure the accuracy of the model this mathematical model is validated against a nonlinear response. Within this research, attention is drawn to five main scenarios and a real-world case study on wind power integration in Sri Lankan power system. Keywords: In this research, various concepts and methodologies were explored, focusing on topics such as power system stability, eigenvalue analysis, participation factors, oscillatory modes, renewable energy integration, nonlinear responses, conventional energy sources, dynamic power system models, controller alterations, grid dynamics, power plant influences, wind energy penetration, solar energy penetration, system damping ratios, small signal stability, state matrix, mode shape analysis, complex plane eigenvalues,network interactions