Small Signal Stability Analysis of Grid Connected Renewable Energy Resources with the Effect of Uncertain Wind Power Penetration

Small Signal Stability Analysis (SSSA) for a hybrid renewable energy system including uncertainties requires an extensive attention to make a system more stable. This paper analyses the method involved in the stability studies of integrated hybrid power system with the help of Lyapunov's stability criteria. The stability studies can be performed for different renewable energy sources like wind generation system, solar PV system and a micro hydro system. In this paper, a study is carried out on a wind generation system which is integrated with the Western System Coordinating Council (WSCC) four machine system. The stability analysis concentrates on the different states of operation of WSCC four machine system with random values of generation and demand. The simulation studies on WSCC four machine system are carried out with the help of MATLAB/Simulink to evaluate stability. This study is validated with the aid of Monte Carlo Approach for evaluations based on iterations. This investigation highlights the significant advantage of conducting stability studies with uncertainty constraints involved, over the deterministic stability studies like probable limitations for transfer capability to cancel out poorly damped oscillations from power system operation.