Abstract
With the increasing proportion of distributed energy resources, the distribution network will face congestion problems caused by fluctuations in renewable energy sources. This paper proposes a distribution system congestion management method based on local flexibility markets. By commercializing the flexibility of various distributed energy sources, the output schedule can be adjusted in market manner to eliminate the congestion. The congestion management based on local flexibility market aims to minimize the cost of flexibility utilization, and is modeled with flexibility constraints of traditional power plants, renewable energy power plants and storage devices. The second-order cone relaxation model is built for distribution system power flow, and system electricity loss is added in the objective function for the exactness. Finally, an improved German Simbench distribution network case is used to verify the validity and accuracy of the model.
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