Investigation of Response of Load-Frequency Controller in Two Area Restructured System with Non-Linear Governor Characteristics

Abstract

The objective of automatic generation control (AGC) is to maintain the system frequency and tie-line flows within the scheduled values. Adaptive control of frequency has become more significant owing to increased size, complexity and restructure of power system. In this dissertation, a framework of automatic generation control with linear and non-linear governor characteristics in restructured power system has been presented. Conventional AGC with nonlinear governor characteristics is reported to be dynamically unstable. To stabilize the frequency and tie-line power flow oscillations, the frequency stabilizer equipped with energy storage system is modeled. The gains of the integral controller and PID controller and parameters of frequency stabilizer are optimized using meta heuristic technique namely Genetic Algorithm. The transient response of optimized load frequency controller is simulated for two-area system comprising non-linear hydro-hydro and thermal-thermal systems. The response of simulated model is also studied under different Poolco transactions and bilateral transactions in restructured electricity market.