A STUDY OF CENTRALIZED VOLTAGE CONTROL METHOD FOR DISTRIBUTION SYSTEM WITH DISTRIBUTED GENERATION

Large volume of distributed power generators (DGs) including renewable distributed generation will be installed in the distribution system in near future. To keep the power quality of the distribution system in case the DGs are installed, a research program of "Demonstrative Project on Power Network Technology" regarding the new electric power system is being carried out under the research contract with the NEDO. The demonstration tests were carried out by use of the control devices such as step voltage regulator (SVR) and static var compensator (SVC) to keep the voltage of the distribution line properly. In this paper, the effectiveness of the centralized control method is shown and improved control method is also considered.