Research On Active Distribution Network Reconfiguration And Fault Recovery Considering Adjustable Load

Active distribution network reconfiguration is an important method to improve system performance and power supply quality of distribution network.However,with the development of distribution network,its constituent units are becoming more and more complex,in which the proportion of controllable load in the power grid is gradually increasing.If the influence of adjustable load is ignored in active distribution network reconfiguration and fault recovery,the efficiency of reconfiguration and fault recovery will be reduced.this document is based on the active composition of the distribution network and the contribution of the adjustable load,the role of the adjustable load is taken into account,and the reconfiguration and fault recovery strategies considering the adjustable load are studied1)This paper classifies and studies the adjustable loads,establishes mathematical models according to their respective characteristics,and establishes the mathematical models of reconfiguration and fault recovery according to their operation modes and response principles,so as to play a role in active distribution network reconfiguration and fault recovery.2)Aiming at the problems of low precision and slow optimization speed of traditional cuckoo algorithm,a new cuckoo algorithm(DE-ADCS)based on hybrid self-adjusting step size based on difference strategy is proposed.On the basis of the traditional cuckoo algorithm,the crossover and selection operation strategies of self-adjusting step size and differential evolution are integrated.Through the algorithm test,the superiority of the proposed algorithm is verified.3)Given the dispatch of adjustable load,a two-level network modification model is proposed for the distribution of the active bar and the distribution generation,which takes the optimal load balance and minimum network loss as the objectives.The model includes scheduling layer and reconfiguration layer.The two-layer reconfiguration model is combined with DE-ADCS algorithm.The grid structure is obtained by solving the optimization model of reconfiguration layer in iteration,and the adjustable load is optimized at the scheduling layer.Therefore,the model can obtain the optimal adjustable load scheduling scheme and the optimal network topology in the same iteration.Finally,the simulation results show the advantages and bilateral properties of the algorithm.The load regulation is the key to the transformation of distribution network.4)When the islanding load can be divided into two parts,one is the active control strategy,and the other is the optimal one.For initial islanding division,a dynamic initial islanding partition method based on exploratory method is proposed to maximize the equivalent recovery,which can give full play to the role of energy storage and distributed generation on islanding division.In islanding optimization,the adjustable load gain index is established based on the adjustable load contract,and the islanding optimization strategy is proposed by combining the index with DE-ADCS algorithm The superiority of islanding division in this paper is verified,and the significance of adjustable load for active distribution network fault recovery is verified.