Research On Frequency Control Of Power System With Wind Power Generation

As the most promising and relatively mature clean power generation technology,wind power technology has maintained a strong momentum of development in recent years,large-scale wind power grid-connected operation has become an inevitable trend.More large-scale wind power not only conforms to the strategic objectives of global energy structure adjustment,but also puts forward higher challenging requirements and to the relevant technical fields.Based on the existing research of wind power generation technology,this paper researches the frequency control of wind power generation system with the aim of stabilizing the system frequency after large-scale wind power grid-connected operation.First,the frequency control theory of traditional power system is analyzed,and the basic principle and classification of wind power generation of wind turbine are analyzed,and then,the basic structure and operation characteristics of doubly fed induction generator introduced;By means of MATLAB/Simulink simulation software,mathematical models involving equations of motion and load model,original motivation model,governor model and double fed wind turbine model was built to realize.Secondly,based on the above-mentioned established model,the operation characteristics of wind turbine generator in different wind conditions are analyzed.According to the frequency control method usually existed in wind power system,through the simulation of wind power frequency control system,the function effect and control strategy of each frequency control method and the power variation and stability of the power system under different operating conditions are contrasted and analyzed.Finally,by means of virtual inertia control,as the same time,the required power value of frequency adjust into the governor control,so that the DFIG system can respond to the change of frequency.And then,cooperating with the pitch control and maximum power tracking control,so as to realize that the wind farm composed of same type variable speed wind turbines can support the frequency of power system.At last,through the MATLAB/Simulink simulation software to verify feasibility and effectiveness of the control structure for the improvement of wind power stability and reducing the influence on grid frequency.