Analysis Of The Impact Of Photovoltaic Power Generation On The Power Grid Of The Yun Cheng City

With the gradual depletion of traditional energy and the serious pollution of the environment,the nations of the world have paid more and more attention to resources and environmental problems.The development and utilization of renewable new energy is an important way to solve the shortage of traditional resources and environmental degradation in China,and will become a new research hot spot in the power system.Solar photo voltaic power generation technology is an effective solution.Photo voltaic power generation has the advantages of wide distribution of solar energy resources,renewable energy,environmental protection,safety and reliability,and simple device structure.In recent years,the power load of Yuncheng area has increased sharply with the rapid development of science and technology and the improvement of people's living standard.With the expansion of the power grid,the traditional large-scale long-distance power transmission has exposed some drawbacks,such as widespread blackouts,high transmission costs,ect.With the rapid development of science and technology and the strong support for new energy policy,the solar pv power generation has shown a trend of rapid growth in the Yun cheng city.But Large scale connection of photovoltaic power generation system to the grid has an impact on the power grid operation and enterprise management in the region.Therefore,carrying out the analysis of the impact of photo voltaic power generation connecting to the local grid and obtaining some relative rules and conclusions have great significance of absorbing distributed power generation.This paper firstly introduced the research background and research significance of the subject and analyzed The basic principle and structure of distributed photo voltaic power generation system and application field of photo voltaic power generation.Then introduced the developing status of photovoltaic power generation Yuncheng power grid,including advantages of solar energy resources,development status and policy support of photovoltaic power generation in Yuncheng.Secondly,the impact of voltage distribution after connecting of photo voltaic power generation is analyzed by using negative load model algorithm and superposition theorem algorithm combining with the actual situation of Yun cheng power grid.Then,this paper analyzed the influence of photo voltaic power generation on network loss and relay protection of distribution network,and put forward some countermeasures for different situations.Finally,the research topic is summarized and the future development trend is prospected.The main results and conclusions of the paper are as follows:1?According to the actual situation and characteristics of Yuncheng area power grid construction,the distribution of solar energy resources in Yuncheng area,and some favorable policies for developing new energy photovoltaic power generation by the state are analyzed,and some current photovoltaic power technologies in Yuncheng power grid are analyzed,and Yuncheng electricity is discussed in detail from the access of photovoltaic power generation.The positive and negative effects of the operation of network enterprises.2?Select the typical line to establish the distribution line model,and use two different model algorithms respectively to analyze the influence of the distribution network after the introduction of the photovoltaic power supply to the steady-state voltage distribution of the line.Then,according to the actual situation of Yuncheng power grid,the specific effects on the voltage of the power grid connected to the distribution network are analyzed in detail through the data collected from the intelligent monitoring platform of the power grid,including the introduction of the photovoltaic power supply and the introduction capacity,and some suggestions and measures are put forward.3?The model of network loss changes after access to distributed new energy generation is established.Through the model,the effects of photovoltaic power distribution network on the network loss of Yuncheng distribution network are analyzed.Combined with the data collected in the last year of Yuncheng power grid,the influence of power generation capacity and load capacity connection ratio on distribution network loss is analyzed.A certain conclusion has been made.