Adaptability Analysis Of Wind Power Integration Into Baoshan Power Grid Based On DIgSILENT Under Asynchronous Interconnection

With the rapid development of industrial standards,atmospheric pollution has become more and more serious,and the primary energy(oil,coal,etc.)available for exploitation on the earth has been decreasing.The gradual replacement of traditional non-renewable energy sources with renewable energy sources is a general trend.Compared with other new energy generation technologies,wind power generation technology is more mature.Wind power generation itself is characterized by strong randomness,weak controllability,and weak interference.As the penetration rate of wind power increases,the stability of power systems with large-scale wind power integration will face severe challenges.With the main network of South China Net and Yunnan Power Grid have entered the asynchronous interconnection mode,Yunnan Power Grid will only interconnect with the main network of China Southern Power Grid through DC lines.The synchronous "hard connection" between the Yunnan power grid and the south network main network through the AC line before the asynchronous networking,transformed into asynchronous asynchronous back-to-back after the "soft connection." This led to the frequency of the main network can not be directly and quickly reflected to the side of the Yunnan Power Grid.The units in the Yunnan Power Grid have undergone major changes before responding to changes in the frequency of the main network.With the continuous increase of wind power penetration rate,the stability of the Yunnan power grid system will undergo major changes.The regional power grid is located at the end of the grid and the network structure is relatively weak.Due to the characteristics of wind power generation,wind farms are usually connected to the end of grid lines,and the grid structure is relatively thin.The object of this article is Baoshan area's power grid is located at the end of the power grid500 kV,its volatility is greater than the main network of Yunnan power grid,once the system fluctuates,it is easy to cause the regional power grid to enter the isolated net mode operation.The frequency of the system rises.Once the fan protection threshold isexceeded,the fan over-frequency protection action will be triggered to make the fan off the net.This is no different from the fact that after the system has undergone a disturbance,the unit tripping disturbance occurs again,which greatly deteriorates the stability of the system operation.Taking into account the gradual expansion of wind power grid connection scale of regional power grids into the trend of the times,after the implementation of the asynchronous networking project,regional grid wind power grid integration will face more severe challenges.According to the above situation,taking into account the uniqueness of the regional power grid,this paper takes Baoshan Grid as the research objective,and analyzes the grid-connected wind power adaptability of the regional grid after asynchronous networking.Firstly,we introduced the asynchronous networking project and the main characteristics of China Southern Power Grid and the response characteristics of Yunnan Power Grid after entering the asynchronous mode.Secondly,the network structure of Baoshan power grid is analyzed in detail.Based on the measured data obtained in BPA,the entire Baoshan area power grid model is built based on DIgSILENT/Power Factory(DPF),a hybrid electromagnetic and electromechanical transient simulation program for power systems.Once more,based on the established model,several experimental schemes under different operating modes were proposed: simulations were performed in the Xia Da,Winter University and Xia Xiao,Dali-Sutun 2 loop faults,Shidian ~ The faults of Baoshan/Shidian~Changning2 loop and the faults of Sutun~Baoshang2 line were faults.Based on this fault,the voltage and frequency characteristics of the Baoshan power grid after fan off the grid were further studied.Finally,consider the model-based access to energy storage systems in Baoshan Grid wind farm,and simulate and analyze the effects of energy storage systems in regulating voltage and reducing the impact of wind power output fluctuations on the grid,verifying its theoretical analysis and The correctness and effectiveness of the strategy.