Development of voltage regulation method including voltage control by switching capacitors of customers in Autonomous Demand Area Power System

In 6.6kV power distribution system of Japan, the introduction of many distributed power generations (DGs) is expected. Under such circumstances, power flow congestion and voltage fluctuation on distribution lines caused by varied output of the DGs will occur. This will result in failure to maintain power quality and supply reliability by conventional power system management. Especially, in residential, commercial and industrial mixed area of Japan, the distribution system voltage will rise at the end of feeder because of reverse power flow by photovoltaic (PV) generations and capacitors (SC) for power factor control by 6.6kV customers. We have proposed a new power supply system referred to as the Autonomous Demand Area Power System (ADAPS). ADAPS may be in the loop formation, in addition to the conventional tree branch formation. We try to establish network technology and operation management technology of ADAPS, and identify its effectiveness. In this paper, we studied voltage regulation method by using Static Var Compensator (SVC), Step Voltage Regulator (SVR) and customer's SCs controlled to improve power factor and to regulate voltage at connection point as power distribution system in transition period from conventional system to ADAPS.