Emergency control strategy for power systems with renewables considering a utility-scale energy storage transient

Integration of renewable energy generators has greatly altered both static and dynamic characteristics of the system. Combined with the uncertainties it introduced, the risk of a system being transient instable is significantly alleviated. This paper proposes a multi-objective coordinated post-contingency control method. It aims to increase post-contingency system security with emergence control (EC) while minimizing the total control cost. Two ECs are adopted in this paper: energy storage systems (ESSs) and emergency load shedding (ELS). ESSs are immediately connected to the network after contingency occurrence to provide both active and reactive power support. ELS will be triggered when the support from ESSs is insufficient to stabilize the system to prevent further deterioration of system security. Performance of the proposed method was evaluated on a modified New England 39-bus benchmark system. The results indicate that the proposed method can find solutions to stabilize the system against credible contingencies and optimally balance between system stability and economy.