Abstract
With the increasing penetration of distributed generation, the problem of insufficient flexibility of distribution network is becoming increasingly prominent. This paper studies the optimal scheduling of flexible resources of active distribution network to improve the flexible adaptability of distribution network. In this research, some distribution network flexibility resources and flexibility indicators are divided into node type and network type; By constructing a double-level optimization model of distribution network flexibility, independent optimization is carried out for node type and network type flexibility respectively. Firstly, two evaluation indexes, net load fluctuation rate and line capacity margin, which can characterize the node type and network type flexibility indexes of distribution network respectively, are proposed. Secondly, based on the basic optimal power flow model of distribution network with second-order cone relaxation, the typical power electronic devices in distribution network are linearized. Thirdly, the two-level optimization model of distribution network flexibility is established; The upper model mainly aims at the flexibility of distribution network node type, and the lower model mainly aims at the flexibility of distribution network type, so as to realize the optimal solution of distribution network node type and network type flexibility by layers. Finally, based on the IEEE-33 node distribution network model, the effectiveness of the proposed two-level optimization model and solution method is verified.
Published Version
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