MAINTAINING VOLTAGE PROFILE OF POWER SYSTEM USING INTELLIGENT SVC

Abstract

One of the major requirements in power system is to provide continuous supply of energy to load centers, with acceptable quality good enough for consumers. In this context, supply voltage is needed to be in limits we desire. This is needed for healthy operation of loads, as well as suppliers. This is vital as the system is pushed to the maximum feasible limits. Hence, there is need for obtaining voltage close to the desired rated value. The control systems used for obtaining response quickly and accurately. Many controllers were developed for the above requirement of desired result and SVC, a first generation static controller provides quick control action with use of proper control. Many other techniques are used for obtaining the desired result. With the commencement of intelligent techniques for control in power systems, responses near about desired values are now being obtained. Fuzzy logic, one among various members of the class of intelligent techniques used in power systems, has been tested for many controllers and has proved its value. For complex and non-linear problems like reactive power control and voltage stability problem, hence it is used mostly among other techniques. In this work a Fuzzy Logic Controller (FLC) was designed and its performance to a number of changes in power system was compared with conventional PI controller. In the work, FLC for an SVC for voltage control has been designed and used. It is seen that FLC is better than PI control. In some cases where the PI control failed FLC was able to provide the required control. During the energization also the settling time by FLC is almost half that of PI control. Also, the performance was improved with the use of FLC, as burden and losses were reduced. On instances where there is requirement of stiff bus voltage, FLC provides responses which are close and around the desired one and also fast. So FLC has been observed to be much better than PI controller for voltage stability.