Grid-connected Design Of Dengshipu Photovoltaic Power Station And Study On Voltage Regulation Of Parallel Grid

With the increasing support from the state for new energy,the proportion of new energy in local power grid is increasing year by year.The large number of new energy grid connection solves the replacement demand of non-renewable energy to a large extent,and makes an important contribution to regional economic development and energy supply.Up to now,wind power generation and photovoltaic power generation account for 90% of the new energy generation.The intermittency,volatility and uncontrollability of wind power generation and photovoltaic power generation bring a certain degree of risk to the safe operation of the power grid,as well as a series of problems to the power grid dispatching control.This paper makes an in-depth discussion on the grid-connection scheme design and technical characteristics of large-capacity photovoltaic power stations,and on this basis,studies the correlation between regional grid voltage and grid-connection of large-capacity photovoltaic power stations.The uncertainty of new energy power generation depends on climate,season,weather and other reasons.When the proportion of new energy in regional power grid exceeds a certain limit,especially wind power and photo electricity,it will make it difficult to adjust the voltage of power grid,resulting in unqualified voltage of main nodes of regional power grid and lowering the overall power quality of power grid.In this paper,Dengshipu photovoltaic power generation project in Faku county is connected to the power grid system as the background.Through the local power grid overview,power balance,power load forecasting,access system scheme,etc.On the basis of this comparative analysis,the influence of the voltage fluctuation of parallel grid point and the active power fluctuation of photovoltaic power station is studied when the photovoltaic power station is running at full load after being connected to the grid,and an optimization model of parallel grid point voltage of photovoltaic power station is built based on an improved particle swarm optimization algorithm,so as to improve the voltage of parallel grid point.The improvement of photovoltaic power station and node voltage method are many,including the adjustment of grid side and user side transformer tap positions,the inverter reactive instructions,SVG reactive power,etc.,through the above methods improve the and node voltage,reduce the negative effects of photovoltaic grid for grid voltage,improve the photovoltaic as the main representative of the new energy into regional power grid safety and reliability.In the context of the rapid development of China's new energy projects,it provides a reference for the future research and project implementation of large-scale photovoltaic power station grid-connection.This paper has 23 figures,19 tables and 62 references.