Load Frequency Control of Multi areasystem

Abstract

In an interconnected power system, the power system load demand varies randomly. Variations in load bring about drifts in frequency and voltage which in turn leads to generation loss due to the line tripping and also blackout. These drifts might be reduced to the smallest possible value by automatic generation control (AGC) which constitutes of two sections are load frequency control (LFC) along with automatic voltage regulation (AVR). The main objective of this research to maintain the real frequency and the desired power output (megawatt) in the interconnected power system and to control the change in tie line power between control areas. The methodology of this research is used simulation to show how (LFC) work by building models in Simulink which helped to understand and evaluate the response by adding secondary control loop with simple integral controller. The simulation results in time-domain verified the effectiveness of secondary control loop through successfully regulating the area control error (ACE) outputs, frequency errors and tie-line power errors in the presences of load changes. The models involve single area, two areas and three areas