Fault Self-Healing Overload Handling Method of Distributed Distribution Protection

The fault self-healing overload handling method of distributed distribution protection is provided in this paper. Firstly, based on the input information of the distribution network, the load calculation model of the distribution room is established with the distribution room as the unit. Secondly, Then, the normal operation feeder safety margin model is established, which includes the normal operation feeder current safety constraint model and voltage safety constraint model, and the open loop point contact line safety margin model is established to complete the construction of the safety margin model. Then, by comprehensively considering the safety margin model and the power distribution room load calculation model, the maximum power supply recovery capacity model of the normal operation feeder is constructed. Finally, according to the established model, a fault self-healing overload handling strategy is proposed to restore the power supply in the non-fault area and output the information of the distribution network. According to the principle of safety margin, this paper deals with the problem of overloading before self-healing gate of distributed distribution protection fault, and comprehensively considers the global voltage and current safety constraints of distribution network. The model is fine and practical. The need for information is small, which is convenient for rapid calculation in engineering applications, and can provide theoretical guidance and reference for rapid power supply restoration in non-fault areas after distribution network failures.