Promote DG Consumption Of The Joint Optimization Of Active Distribution Network Planning And Operation Study

With the shortage of traditional energy and the enhancement of environmental awareness,distributed generation(DG)is widely used because of reproducible,environment friendliness and so on.However,the large-scale DG grid-connection will bring new challenges to the distribution network,in order to improve the response capacity of the distribution network to large-scale DG grid-connection,active distribution network(ADN)came into being,and the ADN components are in the active control to achieve the maximum consumption of DG.In this paper,the optimizationworks from steady state and fault state,considering the uncertainty of DG and load.Secondly,based on DG programming and ADN operation,a bi-level optimization model is proposed to improve DG grid-connected capacity.Then,considering the adaptability of the equipment,the DG grid-connected capacity under the fault state is studied.Finally,on the basis of this,an optimization model based on the optimal benefit of the power grid company is proposed,which can maximize the comprehensive benefit,ensuring the sale operation of the system under steady state,and the protection device can operate reliably in the fault condition.The main work of this paper is as follows:(1)First of all,the definition,key technology of several typical DG and ADN are introduced.To fix the defect that traditional DG cannot be controlled,the DG active and reactive power decoupling control based on grid-connected inverter is used,achieving the control of DG,promoting the DG grid-connected capacity.(2)Based on the meteorological data,the annual operating period is divided into 8760 periods,and the typical operating state subspaces of DG and load are constructed by using K-Medoids clustering algorithm to reduce the wind speed,light intensity and load samples.Then,based on the typical operating state,taking the DG grid-connected capacity as objective function,the bi-level optimization model of active distribution network is proposed,considering distribution network reconfiguration,reactive compensation capacity regulation,controllable load regulation,DG regulation,energy storage regulation and so on.The harmony search algorithm and the adaptive genetic algorithm are used to solve the model.The simulation results show that the proposed model and the solving method can effectively improve the grid-connected capacity of intermittent DG.(3)Based on the adaptability of the equipment,from the single point of DG grid-connection and multi-point DG grid-connection,the acting conditions are analyzed when the fault occurred in the adjacent network feeder line,the network upstream and downstream.And the improvement measures of individual weak equipment are proposed to improve the DG grid-connected capacity.The simulation results show that Installation of current and voltage interlock for quick break protection and the replacement of individual lines can significantly improve the DG grid-connected capacity.(4)Based on the comprehensive benefit of the power grid company,taking into account the profits,environmental benefits and power quality of the grid company,taking the economic index,DG grid-connected capacity and voltage improvement indexas objective function,the weight of each sub-objective function is assigned by entropy method,and a bi-level optimization model is proposed considering DG programming and ADN operation,and the harmony search algorithm and adaptive genetic algorithm are used to solve the model.Finally,the corresponding grid-connected capacity of the optimal solution is checked under fault state,and the individual weak equipment are improved.Through the specific examples,it is verified that the proposed optimization measures can achieve the best overall efficiency and ensure reliable operation of the system in any state.In this paper the optimal configuration of DG and the operation of ADN are studied,at the same time,the adaptability of equipment under fault condition is also considered.the results show that it can improve the permeability of DG,which has certain theoretical and engineering application value.