Optimal Combination of Congestion Management Measures for Distribution Networks Based on Resource Optimization and Classification

Due to the continuous growth of the power load and the higher penetration rate of distributed generation, the power flow overload of the distribution network will appear and cause congestion.An optimization combination method of distribution network congestion management measures based on the optimization and classification of various congestion management resources was proposed to solve the problem of distribution network congestion. Firstly, the resources that can alleviate congestion in the distribution network were defined as congestion management resources; and corresponding mathematical models were established for six types of congestion management resources on the source, network, load, and storage sides of the distribution network. Secondly, the index to measure the level of resource congestion management was defined, and the optimal classification of congestion management resources was carried out by a grey fixed-weight cluster. Thirdly, on the basis of considering the life cycle cost of dynamic capacity enhancing equipment, the optimal combination model of distribution network congestion management measures was established with the objective of minimizing the total cost of congestion management; and was solved by the harmonic search algorithm. Finally, through a specific distribution network example, it is verified that the proposed congestion management scheme can reduce the action amount of congestion management measures and has better economic efficiency.