Investigation on PI and Fuzzy Logic Controllers for LFC Design in Multi-Area Power System

The frequency control is basically a matter of speed control of the machines in the generating stations. The load frequency control (LFC) helps to keep the net interchange of power between pool members at predetermined values. The objective of LFC is to minimize the transient deviations and to provide zero steady state errors of these variables in a very short time. This paper deals with various controllers like without Controller, proportional integral (PI) Controller and fuzzy logic Controller for three area load frequency control in co-ordination with auxiliary frequency controllers is proposed by using MATLAB/SIMULINK. It is designed for a power system comprising areas interconnected by normal tie-lines and frequency controllable High Voltage Direct Current transmission links were auxiliary frequency controllers are used. The qualitative and quantitative comparisons have been carried out for without Controller, proportional integral (PI) and fuzzy logic Controllers. The superiority of the performance of fuzzy over without Control and PI is highlighted.