Graph theoretic approach for preventive control of power systems

Preventive Control for Transient Security with Generation Rescheduling Based on Rotor Trajectory Index

“…The generation is decreased for GD units according to GSF i (7) and new active power schedules for these units are obtained using (8) and (9). The generation is increased for GI units according to LFSF j (10) and new active power schedules for these units are obtained using (11). The obtained results of the proposed rescheduling for each case are verified by observing the transient stability/instability scenario, before and after rescheduling, for each case on the basis of the relative rotor angle swings with respect to COI obtained by the numerical routines for 1sec.…”

“…Various generator rescheduling techniques [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] have been proposed for transient security control. In [6], the transient energy function (TEF) method is used to check the dynamic security of the system and the coherent behavior of generators is used to find a new generation configuration.…”

“…In [9], dynamic security assessment and generation rescheduling method utilizing genetic algorithms (GAs) integrated with probabilistic neural networks (PNNs) and adaptive neurofuzzy inference systems (ANFISs) is proposed for the preventive control power systems against transient instabilities. A generation rescheduling approach for preventive control of power system is presented in [10] to reallocate power generation for multiple unstable contingencies based on graph theory. In [11], proposed a transient stability preventive control design that takes series compensation into account.…”

Improving Power System Static Security Margins by Means of a Real Coded Genetic Algorithm

“…Graph theory and model predictive control (MPC) have also been applied to the computation of control actions. Reference [3] introduces an algorithm based on directed acyclic graphs (DAG) that computes preventive control actions (including generation redispatch, switching, reactive compensation and load curtailment), checking its performance on the IEEE 30-bus. Finally, in [16] an MPC model is used to determine the optimal sequence of control actions.…”

“…If an EPS that is functioning in its normal state fails to comply with the security requirements under contingency, but keeps fulfilling the rest of conditions, it is said to be in its alert state [2], or, according to others authors, unsecure normal state [3]. The actions that must be taken to return the EPS to its normal state are named preventive control actions.…”