AUTOMATIC GENERATION & CONTROL

Abstract

In this paper, a comprehensive study on dynamic system performance of three area interconnected power systems when subjected to small load perturbations is carried out. For the present study, three power system models are identified. To investigate the system dynamic performance, optimal control design and integral control strategy are implemented in the wake of 1% step load disturbance. The three & four area-interconnected systems are simulated and studied through Matlab’s Simulink software. In the following study, performance of AGC for thermal, hydro and gas based power systems are examined by the application of integral controller and optimal controller. In the present work: 1. Integral controller is used to restore the frequency to its nominal value. Controller minimizes the change in frequency in all the three and four area and the tie line power change. Change in tie-line power should also be minimized because if there is any load change in any area, then the extra power required can be get from other area but for this tie-line should be capable of transmitting this extra power but as the agreement done by the system tie-line has a prespecified capacity, so the external action should take place in area where the change has occurred to keep the change in tie-line power minimum. 2. Designing an optimal controller for an interconnected system through optimal control strategy using the Forsha-Elgerd approach and hence to study the dynamic responses for small perturbations in any area. 3. Optimal load frequency control of three area interconnected system.