873 / 2019-04-30 10:57:15

Decentralized Voltage Control Method to Regulate Voltage Profile in Distribution Network

renewable energy,decentralized voltage control,distributed generation,distribution network

The penetration ratio of distributed generation(DG) has increased due to the depletion of fossil fuels and the impacts of global warming. Thus, overvoltage at the point of common coupling(PCC) may occur since reverse current flows with the installment of DG. To solve this problem, this paper presents a reactive power control method based on the measured current at the point of common coupling at DG. The purpose of this paper is not to provide methods to improve the voltage profiles of distribution lines through the reactive power control, but to maintain the voltage after the DG connection as before the connection. While the application of the proposed method to distribution systems has a disadvantage of not being able to solve voltage violations in distribution lines before they are connected to DG, it can maintain the same voltage as before connection to DG regardless of the active power output of DG under connection to a number of high-capacity DGs. By applying the proposed method in this paper, it is possible to significantly improve the penetration ratio of DG by restricting the voltage rise.