Research On The Influence Of Distributed Photovoltaic Access On Distribution Network

With the full implementation of the energy revolution strategy and the continuous improvement of renewable energy development policy,more and more renewable distributed generators are connected to the traditional distribution network.Because the traditional distribution network design does not consider the access of large-scale distributed generators,the access of renewable distributed generators will also have a certain impact on the traditional distribution network,affecting the line loss,voltage and power flow distribution of the distribution network.It is necessary to conduct in-depth research on the impact mechanism of distributed power access on distribution network,in order to guide relevant departments to achieve more effective management and upgrading of distribution network,and improve the economy and stability of distribution network operation.Based on the current development of photovoltaic industry,this paper first introduces the market and policy of distributed photovoltaic power supply and the research status of domestic and foreign scholars on the impact of distributed power access on distribution network.Secondly,based on the established nodal analysis model of distribution network,and the mathematical expression of optimal distributed photovoltaic access point and access capacity of typical load distribution distribution network system is obtained.Thirdly,combined with a distribution network with 43 distributed photovoltaic connections in a certain area of Shaanxi Province,based on historical operation data,the changes of line loss and voltage in distribution network before and after distributed photovoltaic access are studied,and the effects of distributed photovoltaic access on distribution network under different weather conditions,different photovoltaic generation capacity and different loads are further studied,and the suggestions are put forward.An optimal management strategy of line loss in distribution network is proposed.In addition,this paper studies the construction scheme optimization of the following photovoltaic access in distribution network.Based on two different schemes of given access capacity and access location,ant colony optimization algorithm is used to design the optimal location and capacity allocation strategy for the subsequent photovoltaic access in distribution network.For constraints,the optimization of subsequent photovoltaic access schemes can play a guiding role in the follow-up distributed photovoltaic construction of distribution network.Finally,according to the proposed optimal management strategy of line loss in photovoltaic access distribution network and the subsequent optimal access scheme,the proposed line loss management strategy is simulated and verified.According to the proposed optimal access strategy,the following access capacity of two users in the West N Line is optimized.The simulation and experimental results show that the proposed strategy is correct and effective.