Optimal Reconstruction of Active Distribution Network with Current Margin

In the process of distribution network reconstruction, the problem of nonlinear optimization is formed by connecting distributed power supply and dispatching controllable components. Using mathematical optimization method, the output state of switch and control unit is considered comprehensively to optimize the current margin and reduce the network loss. The node voltage constraint is effectively relaxed by large M constraint, and the initial model is transformed by Ll-box and second-order cone relaxation techniques, and a mixed integer programming model based on Ll-box is constructed. Yalmip toolkit is used for modeling, and Cplex algorithm package is called for efficient solution. The example shows that the method is reasonable and effective, which can not only reduce network loss and improve node voltage effectively, but also leave more safety margin for the system. It helps to improve the operation efficiency and reliability of the distribution network.