Use improved Newton method to calculate theoretical line loss of distribution network

The paper introduced traditional calculation methods of theoretical line loss of distribution network, and pointed out that electricity quantity method and root-mean-square method would cause too small theoretical energy loss and too large management line loss because of insufficient consideration of change of load curve. For above problems, it put forward a calculation scheme for theoretical line loss of distribution network by use of improved Newton method, which does power flow calculation according to power records of 24 h of each substation in the whole distribution network, so as to obtain total line loss of the distribution network. It used electricity quantity method, root-mean-square method and the improved Newton method to calculate theoretical line loss of a 10 kV distribution network separately, and got a conclusion that results calculated by the improved Newton method are closer to statistical value than the other methods.