Voltage Control for a Loop Distribution System with Renewable Energy Sources

Abstract

This paper describes and verifies a voltage

control for a loop distribution system. The proposed method

adopts SCADA system based on voltage data from IT switches,

which are sectionalizing switches with sensor installed at 6.6kV

distribution line. The proposed voltage control combines

centralized control of a LRT and autonomous control of

decentrally-allocated RESs. The tap change control of LRT

takes the major role of the proposed voltage control. It is the

extended type of LDC method which is generally adopted, and

minimizes voltage deviations based on voltage data from each

IT switch. The output power control of RES additionally and

autonomously supports the voltage control when the voltage

violation from the upper limit is unavoidable. The reactive

power control in the vacant capacity of RES's inverter mainly

works, and the active power control works when not enough. In

order to check the validity of the method, the experimental

simulations using an analog distribution system simulator are

carried out. This study is supported by a specially-promoted

research grant of Power Academy in 2009 from the Federation

of Electric Power Companies of Japan.