Analysis Of The Influence Of Large-scale Wind Power Integration On The Operation Characteristics Of Zhanjiang Power Grid

With the rapid development of wind power generation technology,the installed capacity of new energy power generation is increasing year by year.At present,the common new energy sources such as wind energy and solar energy have the characteristics of wide distribution,low energy density and intermittence,and the output power of their power generation system has large random fluctuations.A large number of new energy generation connected to the grid has brought many adverse effects on the power quality and stability of the traditional grid.Therefore,it is necessary to evaluate the impact of large-scale new energy on the stability of power grid,put forward reasonable coordinated control scheme,reduce the risk of power grid operation,and improve the capacity of clean power supply acceptance.Firstly,this thesis studies the characteristics of the influence of wind power on the peak load regulation capacity of the system after grid connection.Taking Guangdong power grid as the analysis object,this thesis studies the fluctuation characteristics of wind power,the seasonal load variation characteristics and the relevant characteristics of wind power and grid load,and gives the analysis method of the peak load regulation capacity of the system after grid connection of wind power.Taking Zhanjiang grid’s heavy operation mode in winter and low operation mode in winter at the beginning of wind power grid connection in 2015 and low operation mode in summer 2020 as an example,this paper analyzed the peak load regulation capacity of the system after large-scale wind power connection.Then,on the basis of analyzing the characteristics of wind power grid connection,this thesis establishes the steady-state model of wind farm,and the characteristics of four common steady-state models,FSIG,WRIG,DFIG and PMSG,are analyzed,and the selection methods of steady-state models of wind farms in different situations are given considering the factors such as unit type,wind farm capacity and the influence of power collection system.Taking Zhanjiang Power Grid as a typical example system,the influence of large-scale wind power grid connection on regional power flow and voltage distribution is simulated and analyzed.Finally,Taking Zhanjiang Power Grid as an example,the static voltage stability of regional power grid with large-scale wind power is studied by using PV and VQ curve analysis method.The static voltage stability of Zhanjiang Power Grid is analyzed when the wind power output changes in the range of 0-100% in 2015 under the grid structure and operation mode.It also points out that the relatively weak voltage area is affected by wind power connection in Zhanjiang area and the corresponding reactive voltage control measures are given.The results show that the reactive voltage problem in Zhanjiang area with large-scale wind power can be effectively solved by reactive compensation and regulation of transformation ratio.