Effect of Distributed Generation Grid-Connection on Line Loss in Low-Voltage Courts

With the introduction of a series of photovoltaic subsidy policies by the state, rooftop photovoltaic (PV) of enterprises and residents has developed rapidly. The traditional passive single distribution network has become active bidirectional network, which brings new challenges to line loss management of distribution network. This paper analyses the change of power flow direction in distribution network containing distributed photovoltaic and the influence of different operation modes of photovoltaic on line loss. The traditional formula for calculating line loss rate in low-voltage courts is revised. Through the analysis of practical cases, it is concluded that in active distribution network containing distributed photovoltaic, the optimal utilization mode of photovoltaic power generation is spontaneous self-use, followed by the absorption within the court and the line loss rate in the court shows a downward trend with the increase of the absorption ratio.