Optimal Power Flow Algorithm for Large-scale Integrated Transmission and Distribution Networks

To satisfy the requirements of analyzing and managing large-scale integrated transmission and distribution networks, an integrated optimal power flow algorithm, based on integrated power flow algorithm, is proposed in this paper. Considering the seriously ill-conditioned Jacobian matrix and poor convergence, self-adaptive Levenberg-Marquard method and incomplete LU decomposition method are used to optimize the integrated power flow algorithm. In addition, a modified DC optimal power flow model is built, whose constraints are linear. A self-adjusting interior point method is proposed to solve the model based on branch losses obtained by the integrated power flow algorithm in each iteration. Numerical experiments illustrate that the proposed algorithms have high efficiency. In addition, they are applicable to many issues, such as distribution networks with loops, distribution networks with distributed generations, seriously ill-conditioned systems, multi-distribution-network areas, etc.