SECONDARY VOLTAGE CONTROL - ANALYSIS, SOLUTIONS AND SIMULATION RESULTS FOR THE SPANISH TRANSMISSION-SYSTEM

Secondary Voltage Control was introduced in some European countries as a means to improve voltage security and operation. It is a closed loo p system dedicated to keep the voltages of some load buses called pilo t buses constant. In this paper a new approach covering all the main a spects of Secondary Voltage Control: pilot buses and generators select ion, the control law and the decentralization problem, is presented. T his approach has been applied to the Spanish power system. Some of the results obtained are also presented.