Impact of large scale wind power penetration on power system oscillations based on electric torque analysis

Modal analysis and electric torque analysis are two types of the most widely used techniques for studying the oscillation stability of multi-machine power systems, such as power system stabilizers (PSS). With inclusion of large scale wind farm, many methods are used to analysis the oscillation stability of the system. The method electric torque analysis (ETA) is proposed for further research of the system with doubly fed induction generator (DFIG). ETA is established and developed from a physical understanding of the characteristics of the electromechanical oscillation loop of generators in power systems. East China coast has the main and enormous wind energy capacity. The research based on the method of ETA is studied to obtain deeper information of the operating system.