Hierarchical and partitioned load shedding method of active distribution network in demand response perspective

When the power line fault or the power shortage occurs，the partial load should be quickly shed to ensure the reliability of the distribution network system. A hierarchical and partitioned load shedding method of active distribution network considering demand response is proposed. Firstly，the electrical distance is defined，and the distribution network is divided into several sub-areas combined with the community discovery method. Secondly，the local load shedding optimization model of the active distribution network is established，which takes the maximum user satisfaction and the minimum demand response cost of the whole network as the objective function and considers the constraints of safe operation and user response willingness in the sub-areas. Moreover，the mixed-integer second-order cone programming algorithm is used to solve the model efficiently. Finally，based on the idea of event-trigger mechanism，the hierarchical and zoning coordination control architecture of active distribution network is constructed，and the effective interaction and accurate execution of load shedding information within／between areas are realized by using limited communication resources. Results of case analysis show that compared with the traditional load shedding scheme，the proposed method can not only improve the system voltage level after the access of distributed generation，reduce the load shedding cost and improve the satisfaction of users to participate in the demand response，but also alleviate the multi-level communication transmission pressure of distribution network and improve the efficiency of load shedding scheme of complex distribution network. © 2022 Electric Power Automation Equipment Press. All rights reserved.