Research On Economic Operation And Dynamic Voltage Of Local Power Grid With Wind Farms

With the deteriorating environment and the increasing attention to pollution from traditional fossil energy sources,clean energy is developing rapidly.As an important part of clean energy,wind power generation has many advantages,but the large number of wind turbines connected to the grid also brings a severe test to the stable and reliable operation of the grid.The impact of wind power generation on the stability of the local grid voltage is analyzed,and the tidal model of the local grid containing wind farms is established by simulation method to analyze the dynamic voltage of the local grid.This paper simplifies the wind farm nodes in the tidal current calculation,analyzes the steady-state equivalent circuit,the simplified steady-state equivalent circuit of asynchronous motor,and analyzes the static voltage stability and transient voltage stability of the wind farm.By introducing the basic principle of doubly-fed wind turbine,power transfer relationship,operation state and mathematical model of doubly-fed wind turbine,the voltage equation of doubly-fed wind turbine is pointed out,and the vector control method of doubly-fed turbine is introduced.The influence of dynamic components of the power grid on voltage stability is analyzed,and the relationship between on-load regulating power transformer,overexcitation limiter,load and voltage stability is analyzed,suggesting that there is a close connection between voltage stability and dynamic components in the power system.The reactive power regulation strategy is analyzed,the role of reactive power optimization,and the compensation characteristics of various types of wind power common reactive power compensation devices are analyzed.The general strategy of transformer control is understood by analyzing the working principle of transformers,the main reactive power voltage control tool in the power system.The mechanism of the effect of wind power grid connection on the grid voltage is briefly analyzed,and the impact of wind power grid connection on the regional grid is analyzed.Finally,by analyzing the impact of a wind farm access on the local grid voltage and power factor,it is concluded that the impact of wind farms on the surrounding grid is regional.The impact of different wind power outputs on the local grid is studied by the output model of wind power obtained through stochastic current analysis.The dynamic simulation analysis of the local grid with wind power access is mainly from two aspects,the impact of wind farm access on the tract branch and the improvement effect of dynamic reactive power compensation access.Countermeasures are proposed for the impact of wind farms on grid reactive power planning.