Alternating iterative method for congestion management of microgrid integrated distribution network

Abstract

The distributed generations (DGs) are connected to medium or low level distribution network, and one of common ways to integrate these resources is to resort the so-called microgrid (MG) application. Yet, the high penetration of DGs, thus the MGs may incur the congestion of distribution network during operation. To address this issue, this paper proposes an alternating iterative method to solve the congestion management problem of the distribution network when multiple MGs are integrated. The problem is formulated as a constrained optimization problem with its objective being optimizing the generation cost while respecting the hard constraints imposed by both the MGs and distribution network. The formulated problem is then solved through an alternating iterative method wherein the distribution network and MGs alternatively optimize their own objective functions towards to the optimal solution of the original problem. Case studies with a 5-bus distribution system and the modified IEEE-13 bus system demonstrate the effectiveness of proposed method.