Publication

Abstract : This paper investigates on enhanced Load Frequency Control of two-area hydrothermal power plant when subjected to unit step load disturbance. The frequency and tieline power deviations are controlled using conventional Proportional and Integral controller tuned using Zeigler Nichols' method. By switching the controller action during transient and steady state period using Variable Structure System, the performance is improved. Fuzzy Gain Scheduling further improves the system performance by changing the proportional and integral gain according to the variations in the power plant. Finally, Variable Structure Fuzzy Gain Scheduling Controller is developed by integrating Fuzzy in Variable Structure System Controller resulting better controller action during transient and steady state period. The performance of these controllers is judged using Integral Time Absolute Error and Integral Time Squared Error techniques. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.