Design of AVR and ALFC for single area power system including damping control

This paper presents the combined control for single area power system including automatic voltage control by using automatic voltage regulator (AVR) and automatic frequency control by using automatic load frequency control (ALFC). The paper shows the coupling effects between the two loops, which are studied by extending the linearised ALFC system to incorporate the excitation system. A proportional integral gain controller is included in the AVR loop and conventional integral controller in ALFC loop so that system responses become better in terms of peak deviations and settling time. Damper winding is included in the AVR loop which is present on the rotor of the synchronous generator. Simulation studies reveal that the response of the system becomes better in terms of peak deviations (overshoots and undershoots) and settling time when damper winding is included in the system.