Economical Preventive Control of Power Flow After Disturbances in the Decentralized Power System

Abstract

This paper discusses the preventive controls of the generator outputs to improve security in the decentralized power system. Preventive controls of the power system can improve security level. However the preventive control requires too many computation time because of too many considerable faults in the power system. We can consider multiarea decentralization to reduce computation time of the power flow calculation. We assume that the effects of disturbances in the external systems are relatively smaller than the effects of disturbances in the study area. Linearized sensitivity analysis is used to evaluate the effects of the external systems to reduce computation time. Linear programming is used to determine the control signals of generators considering the incremental cost of generators. The NewEngland 38 buses system is used as an example system to check the validity of algorithm in this paper. The calculations of the example system show the satisfactory results.