Matlab Simulink Implementation of Event Triggered based LFC for Multi Area Power System

Abstract

In an interconnected power system, as a power load demand varies randomly, both area frequency and tie-line power interchange also vary. The objectives of load frequency control (LFC) are to minimize the transient deviations in these variables (area frequency and tie-line power interchange) and to ensure their steady state errors to be zeros. Among all the LFC controller designs, the most widely used for industry practices are PI controllers. However, for a traditional PI controller, its parameters are usually obtained by the designer's experiences or by trial-and-error approach, which lacks optimal performance in wide range of operating conditions and configurations. To overcome this shortage, many control methods are applied to adaptively turn the controller parameters. The adaptive dynamic programming (ADP) based designs are model free, and have attracted a lot of attention in the power system control field.

In this work, load frequency control (LFC) with supplementary adaptive dynamic programming (ADP) is proposed. The primary proportional-integral (PI) controller uses different proportional and integral thresholds for updating the actions, while the supplementary ADP controller is updated in an aperiodic manner. Finally the test system is simulated in the environment of Matlab Simulink to validate the advantages and robustness of proposed method.