Distributed Scheme for Line Overload Mitigation With Linearized AC Power Flow

The transmission overload after a disturbance poses significant security risk to the power system. Once it happens, an efficient remedial action must be taken to relieve the line overloads as quickly as possible. The line overload mitigation problem becomes more urgent and challenging in the future power grid that integrates distributed and fluctuating renewable energies. In this brief, we propose a distributed corrective control scheme for alleviating the overloads in transmission lines. A linearized AC power flow model is introduced, and the error of linearizion is compensated through a close loop of power flow control. The proposed distributed control framework not only satisfies the need of accommodating distributed resources in future grids, but also guarantees the system security during the line overload mitigation process. The performance of our corrective control scheme is demonstrated in the simulations using the IEEE 14-bus test system.