An Efficient Sparse Matrix Technique for Closed Loop Current Analysis in Distribution Network

In order to improve the power supply reliability in distribution network, the closed loop operation is used to achieve the purpose of transferring power loads without outage. In this paper, the closed loop current is calculated by power flow method. Firstly, the three electrical islands which are affected most by closed loop operation are spliced together. At the same time, this paper expands the voltage constraints and the power change constraints of boundary nodes. Then, the sparse matrix technique is used to process the Jacobian matrix to quickly calculate the power flow. Finally, the rapidity and accuracy of the proposed method are verified by the calculation result of closed loop current of a regional power system.