Passivity based distributed event-triggered load frequency control

Abstract

This paper presents a method of reducing data communication burden in multi area load frequency control. An aperiodic event-triggered based control approach has been adopted to reduce the communication bandwidth requirements and governor operations. The control law is computed and actuated only when a pre-defined output dependent event condition is satisfied. The triggering condition in the previously reported works, depends on system states or outputs of all areas which is generally not available in an area control center of a real power system. Therefore a distributed event-triggered load frequency control has been proposed where the triggering condition in an area control center depends on output information of that particular area. A passivity based approach is adopted to ensure the system stability analytically and to derive the event triggering condition. Performance of the proposed controller was shown in terms of RMS error of frequency, tie line deviations and the reduction in communication burden for continuous load change, step load change and plant model variations in a two area test system.