A Study of Load Frequency Control for Two Area Power System Using Two Controllers

Power demand in any region is continuously increasing causing changes in system's frequency and hence causes major problems in system stability. Interconnected power systems have great advantages to maintain the stability, insure continuity of supply and furthermore maintain the frequency to its nominal value. The control of the interconnected power systems is done by Automatic Generation Control (AGC), which is composed of two parts, Automatic Voltage Regulator (AVR) and Load Frequency Control (LFC). Whenever a disturbance occurs, LFC acts to restore the system into its steady state with zero error as well as desired transient response characteristics. This paper demonstrates the design and implementation of integral and fuzzy logic controller (FLC) for a two area power system taking the steady state error and percent overshoot as comparison parameters. For a step load perturbation, the FLC produced better transient characteristics for the frequency deviation. MATLAB/ SIMULINK software was used to carry out the implementation and obtain results.