Research On Self-disciplined Cooperative Control Strategy Of Reactive Power And Voltage In Active Distribution Network

In recent years,with the access of a high proportion of distributed generation(DG)in the active distribution network,the uncertainty of its output may cause power imbalance in the distribution network,resulting in the voltage of the grid.fluctuate,even beyond the limit.In addition,some distribution networks in my country are lagging behind in construction,weak grid structure,unreasonable structure,poor reliability,insufficient power supply capacity,and unsatisfactory power grid energy indicators.Reasonable reactive power optimization for the distribution network.How to ensure the safe and stable operation of the system,build a reliable distribution network reactive power optimization model,reduce network losses,optimize economy,and improve power supply quality is the top priority in my country’s current distribution network reactive power optimization.Because of the flexible power regulation capability of energy storage system,it can be an effective means to manage the voltage of the distribution network.In this paper,the energy storage equipment will be connected to the distribution network,and the reactive power compensation device will cooperate with each other to form an active and reactive power coordination optimization model,and verify whether it can reduce the voltage fluctuation caused by the wind and the wind and promote the reasonable action of the reactive power compensation device.Purpose.Then,on the basis of this model,using indicators such as voltage sensitivity,the access location and access capacity of the reactive power source are determined.Then,the idea of hierarchical clustering is used to divide the voltage regulation area of these reactive power source nodes,and formulate a strategy for autonomous control of reactive power and voltage inside and outside the area,so as to better realize the safe and economical operation of the distribution network.Based on the above background and optimization ideas,the paper mainly carries out the work from the following points:Firstly,according to the characteristics of active distribution network,this paper proposes a model of active and reactive power coordination optimization.By formulating a reasonable charging and discharging strategy of energy storage device and a reasonable action strategy of reactive power compensation device,the model can suppress the voltage fluctuation caused by wind and solar output,reduce the frequency of reactive power compensation device action,and then improve the economic operation level of distribution network.Secondly,based on the Ward distance,this paper performs hierarchical clustering of each node of the distribution network,and establishes a model of autonomous control of reactive power and voltage within a region and cooperative control between regions.In this process,comprehensive voltage sensitivity is introduced to determine the optimal access position and access capacity of DG,and combined with hierarchical clustering algorithm,the local voltage regulation domain of DG and reactive power compensation device is determined.Finally,the improved particle swarm algorithm is used to calculate and simulate the above-mentioned hierarchical partitioned IEEE 33 node distribution network model.In the analysis,by comparing the unoptimized,intra-regional,and inter-regional optimization voltage amplitudes,network losses,and reactive power output in each region,it is verified that the distribution network optimization model after hierarchical partitioning has better voltage regulation effects.