Short circuit current calculation of non full measured distribution network based on modified power flow algorithm

According to the characteristics of non full measured distribution network, a short circuit current calculation method based on modified power flow algorithm is proposed. It uses measured voltages to initialize the voltages of all nodes and introduces the static voltage characteristic model to decide the power of all loads, through the forward and backward substitution calculation of voltages, the voltages of all nodes in normal state are obtained. Then, base on the results of power flow calculation and the parameters of short circuit fault, to establish the node voltage Eq. of fault system, the short circuit current can be calculated by solving the Eq. From the example of a 15 nodes non full measured system, the calculation results of four kind short circuit faults are very similar to the results of simulation on the Matlab; this indicates the feasibility and validity of the algorithm.