AN EXPERT SYSTEM FOR VOLTAGE CONTROL IN A POWER SYSTEM NETWORK

ABSTRACT: This paper presents a pro-totype of an expert system for alleviation of voltage violations in the day-to-day operation of large power networks. Voltage control for varying load and genera-tion conditions can be achieved by co-ordinated control of switchable shunt VAR Compensating (SVC) devices and On load transformer taps (OLTC), while genera-tor excitations are used in dynamic control of voltage profile. This paper deals with the development of an expert system for voltage corrections for base case and contingency conditions using switchable shunt reactive compensation and transformer tap settings. The per-formance of the expert system is compared with the conventional optimization technique of voltage control and concurrent results have been obtained. The pro-posed expert system has been tested with simulated conditions of a few practical power systems. Results obtained for a 24 bus EHV Indian power network have been included for illustration purpose. The expert sys-tem is found to be suitable for on-line application in Energy Control Center as the solution is obtained very fast.