考虑配电网电源侧故障的区域检修负荷转移方法OA

[Objective]Power supply side faults in distribution networks are prone to cause three-phase current unbalance,which may further lead to regional power supply interruption and threaten the safe and stable operation of the power grid.Traditional load transfer strategies usually only focus on power balance,without fully considering the impact of negative sequence current distribution on system recovery,which tends to result in disadvantages such as low recovery efficiency and frequent switch operations.To address this problem,aiming at the scenario of power supply side faults in distribution networks,a regional maintenance load transfer method was proposed to achieve efficient grid recovery after faults and optimize load loss,network loss,and the number of switch operations.[Methods]The symmetrical component method was adopted to calculate the negative sequence current in the fault composite sequence network.By comparing the phase difference between the fault phase voltage phasor and the negative sequence current and setting a threshold value,the area to be restored and power outage area were accurately located.After the area division,load transfer was carried out.A multi-objective load transfer optimization model was established,which took the minimization of combined load loss,the number of tie switch operations,and additional network loss as the objectives,with six constraints including topological structure and load controllability set.In view of the conflicts among multiple objective functions,a hybrid algorithm combining genetic algorithm and heuristic search algorithm was used for solution,which could effectively avoid falling into local optimal solutions.Based on the topological analysis and judgment results,available tie switches and preliminary load transfer schemes were searched.Combined with various influencing factors,the hybrid algorithm was applied to obtain the optimal transfer path and generate the best load transfer scheme.By adjusting the states of tie switches,the load was transferred from the area to be restored to the power outage area,which thereby restored power distribution and supply.[Results]To verify the effectiveness of the proposed method,a simulation test was carried out on a 10 kV distribution network in a certain area.The test results show that the average load loss of the proposed method is only 0.215 3 kW,and the additional network loss is relatively small.The minimum number of tie switch operations is only 9 times,and the voltage of each node is generally maintained at a high level,which ensures power supply reliability.[Conclusions]By accurately analyzing the negative sequence current distribution,reasonably dividing the fault-affected areas,and realizing load transfer based on multi-objective optimization,the proposed method effectively avoids the performance trade-off phenomenon in traditional strategies.This method can balance power supply reliability,economy,and rapid recoverability,providing a new technical path for handling power supply side faults in distribution networks,which has significant engineering practical value and popularization prospects.Future research will further combine with dynamic topological reconfiguration and intelligent prediction technologies to enhance its adaptability in complex fault scenarios.