摘要
Abstract
With the continuous promotion of China's"two-carbon"strategy and the construction process of new power systems,the installed proportion of distributed power sources such as photovoltaic power generation continues to increase.However,due to the strong randomness and intermittence of photovoltaic power output,large-scale photovoltaic power sources are disconnected,resulting in large-scale changes in the power flow of distribution network.The problems such as power flow backflow,voltage overstep,voltage fluctuation and network loss increase appear successively in distribution network,which seriously affect the safe,stable and economic operation of distribution network.Firstly,in view of the prominent problems of voltage and loss caused by distributed photovoltaic,it establishes the relationship equations of voltage deviation,loss and power factor in the distributed photovoltaic access system,and demonstrates the relationship among the output,voltage deviation and loss of distributed photovoltaic.Then,combined with the actual operation data of a 10 kV line,it builds the ETAP time-series power flow simulation model,and proposes the comprehensive treatment method of distributed photovoltaic voltage over-limit.Finally,it verifies the effectiveness of the proposed governance method through experimental simulation analysis.The proposed method considers both the size of the power grid load and the characteristics of photovoltaic output,fully utilizes the reactive power regulation capability of the inverter,improves the voltage qualification rate of the distribution network,and provides theoretical and practical references for the governance of voltage over-limit in distributed photovoltaic.关键词
配电网/分布式光伏/电压越限/损耗/综合治理Key words
distribution network/distributed photovoltaic/voltage over-limit/loss/comprehensive treatment分类
信息技术与安全科学
