Impact of large-scale wind power integration on grid fault identification and real-time decision-making technologies in stability control systems

In order to analyze the impacts on the grid fault identification criteria in stability control systems (SCSs), an electromagnetic transient model is set up for a three-machine nine-bus test system containing wind power generators. Then, an analysis of impacts on adjacent AC grid fault characteristics of wind power integration and its power electronics based control systems and a discussion of problems which traditional grid fault identification criteria may encounter are presented. Results show that the small short-circuit current, different sequence impedance characteristics and Crowbar protection may decrease the sensitivity and reliability of conventional SCSs. Besides, the impact of wind power short-term fluctuation on the emergency control effects in a large-scale wind power base is analyzed and three real-time decision-making models used for overload control are proposed based on the principles of justice and fairness, controlled quantity minimization, and control risk minimization. The applicable scope of each model is also analyzed.