Transient frequency control with regional cooperation for power networks
For power system operators, this work provides a practical approach to manage transient frequency deviations with regional cooperation, though the method is incremental.
This paper develops centralized and distributed sub-optimal control strategies to keep transient frequencies of selected buses within safe limits while ensuring asymptotic stability of the power network. Simulations on an IEEE-39 bus system demonstrate the effectiveness of the proposed methods.
This paper proposes a centralized and a distributed sub-optimal control strategy to maintain in safe regions the real-time transient frequencies of a given collection of buses, and simultaneously preserve asymptotic stability of the entire network. In a receding horizon fashion, the centralized control input is obtained by iteratively solving an open-loop optimization aiming to minimize the aggregate control effort over controllers regulated on individual buses with transient frequency and stability constraints. Due to the non-convexity of the optimization, we propose a convexification technique by identifying a reference control input trajectory. We then extend the centralized control to a distributed scheme, where each subcontroller can only access the state information within a local region. Simulations on a IEEE-39 network illustrate our results.