DESIGN OF FUZZY LOGIC CONTROLLER FOR SMALL HYDRO PLANT

Abstract

In this dissertation work, a Fuzzy Logic Controller is designed for run of river small hydroelectric plant to study its behavior under normal and emergency conditions using MATLAB SIMULINK. The various components of small hydroelectric plant like, governor, penstock and turbine, synchronous generator, exciter, transmission Line are considered in simulation. FLC's as Governor and Exciter are designed based on fuzzy set theory. The controller is suitable for real time operation, with the aim of improving the generating unit transients by acting through the exciter input, guide vane position. In these FLC, generator speed deviation and acceleration are taken as controller inputs for both the Exciter and governor. These inputs are first characterized by linguistic variables using fuzzy set notations. A fuzzy relation matrix is built to give the relationship between controller input and controller output. To demonstrate the effectiveness of FLC, A Power system subjected to 3-phase fault under different operating conditions is performed. It is found that the FLC can improve the dynamic performance of a SHP over a wide range of operating condition. Since the FLC does not require model identification, it can be easily implemented in computer simulation. Using this application, the dynamic behavior of a small hydroelectric plant under isolated and Gird connected conditions can be studied when subjected to disturbances such as- load-variation, three-phase symmetrical fault, speed reference setting variation. This will also help in tuning the parameters of governor, exciter and checking the preliminary design of small hydro plants.