Analysis Of The Impact Of New Energy Grid Connected To The Safe Operation Of 500kV Extra-high Voltage Power Grid And 500kV Substation In Inner Mongolia

The construction task of 500kV power grid in Inner Mongolia is arduous, till 2020, there will be 55500kV substations of the power grid,of which the transmission capability will be more than 200 million kilowatts.large-scale wind power and photovoltaic combined to the power grid is a severe test for Inner Mongolia power grid, due to the instability of wind power and photovoltaic operation.Based on the background of Inner Mongolia 500kV power grid structure, the paper analyzes and studies the safe influence of the grid integration of new energy in Inner Mongolia 500kV extra-high voltage substations.Firstly, this paper analyses of the current situation of the security and stability of power grid at home and abroad,aming at the existing stability problems of 500kV substations in Inner Mongolia power grid, analyses the security situation of Inner Mongolia power grid,stability of 500kV substations and Mengxi grid structure changes and characteristics from the network structure changes and the short circuit capacity to affect the safe operation of the system,finally the security and stability control strategy of regional is obtained.The harm of new energy grid integration is analyzed.Secondly,through the three cases of normal operation state、three-phase short circuit fault and a drop of 20% in voltage of the 500kV power grid,the grid connected variable speed constant frequency doubly fed wind turbine is simulation analysed respectively, which shows that it’s necessary to change the instability of wind power in 500kV substations.Thirdly,china’s wind power, photovoltaic power generation, energy storage and smart grid are studied theoretically, using wind energy storage technology in Inner Mongolia power grid scheduling strategy and control technology of data analysis shows, scenery storage technology applied in Inner Mongolia power grid, improve the stability of 500kV substation in Inner Mongolia super high pressure.The use of wind and photovoltaic energy storage technology analysis of scheduling strategy and control technology in Inner Mongolia power grid shows that wind and photovoltaic energy storage technology applied in Inner Mongolia power grid, improves the stability of 500kV substations in Inner Mongolia eltra-high voltage.