Research on the problem of low voltage at the end of distribution network transformer areas solved by distributed photovoltaic power storage
LUO Peigen
TANG Huan
LI Hongjun
Abstract：Aiming at the problem of low voltage at the end of rural distribution transformer areas,taking the 50 kVA transformer area in Yibin,Sichuan Province as the research object,a method of connecting to the end of low-voltage distribution network transformer areas by using a distributed photovoltaic system with energy storage is proposed.The energy storage batteries are charged through the distributed photovoltaic system and the surplus power is fed to the grid.The results show that with only 48 000 yuan spent on installing 5.2 kWh of energy storage and 1.0 kW of photovoltaic at the end,the measured minimum voltage value rose from 182 V to 192 V,and the voltage qualification rate improved significantly.The daily power loss in the transformer area has decreased by 5 kW to 10 kW,and the line loss rate has dropped from 6.79%to 2.87%,saving 320 yuan to 520 yuan in line loss electricity charges annually.Compared with the traditional expansion and line replacement cost of 182 000 yuan,the investment has been reduced by 73%and the construction period has been significantly shortened.
Keywords：distributed photovoltaicenergy storagelow voltagedistribution network
Publication Date：2025-07-25
Online Publishing Date：2025-09-15(First online date of this platform, not the publication date of the document)
Pages：5( 55-59 )