Modeling of Automatic Generation Control and Automatic Voltage Regulator of Interconnected Thermal Power System

Abstract

As the interconnected power system, transmits the power from one area to another, frequency will be inevitable deviate from scheduled frequency, in addition to both the active and reactive power demands are continually changes with rising and falling trend, any mismatch between system generation and demand results in change in system frequency that is highly undesired excitation of generator must be regulated in order to match the reactive power demand, otherwise bus voltage falls beyond the permitted limit. This thesis presents new model for each component of Automatic generation control (AGC) and automatic voltage regulator (AVR) loops considering generator rate constraints (GRC) of one and two areas interconnected thermal power system. The response with GRC is compared with the analysis done without the Generation Rate Constraint. Although the frequency deviation was found to be less with suitable controllers when the GRC is not considered, it is not the actual frequency deviation. When GRC is considered the actual frequency deviation can be found and then accordingly the controller is tuned. So that the desired frequency and power interchange with neighboring systems are maintained in order to minimize the transient deviations and to provide zero steady state error in appropriate short time. Further the role of automatic voltage control is to maintain the terminal voltage of synchronous generator in order to maintain the bus bar voltage, results are obtained using MATLAB SIMULINK software.