Demonstration study on centralized voltage control system for distribution line with sudden voltage fluctuations

The volume of distributed generation (DG) including renewable sources is growing. To keep the power quality of the distribution system with large volume of DG, a research project of "Demonstrative Project on Power Network Technology" regarding the new electric power system is carried out under the research contract with the NEDO. In the project, control devices such as static var compensator (SVC) and centralized control system to keep the voltage of the distribution line properly were developed. In this paper, the centralized control system is improved by the autonomous voltage control of SVC. The demonstration tests with sudden fluctuations of photovoltaics are carried out and effectiveness of the centralized control method is studied experimentally.