Research And Design About Application Of SVG In Wind Farm

Because of the uncertainty of wind resources, electric energy produced by the wind turbine exist many problems, as the inherent characteristics of the motor, when wind speed change. Voltage distortion and unqualified power factor as well as harmonic pollution make that the National Grid is not willing to purchase much new energy power represented by wind power. It is no doubt a waste of energy and discrimination against new energy.Now the large scale wind farm is still heavily using the conventional reactive compensators in grid-connection. Although these traditional devices still has some values, but the heavily using will lead to a great waste of energy, and violated the "strong smart grid" advocated by our country. The conventional reactive compensators can only compensate to some prediction load, however for those sudden and unpredictable load,which is more common with the development of economic, they can not play a role. In order to solve these problems, especially in the wind farm reactive power compensation, this study researched an application of SVG in wind farm, through which can further strengthen the cognition in field of reactive power compensation in wind farm and also hope to make a little contribution on reactive power compensation for new energy.This paper first analyzes the meaning of reactive power and the harm in the wind farm to the grid. After that, the mathematical model of SVG is modeled by the method of mathematical deduction and equivalent analysis.In order to determine the stability of the model, the model is used to determine the stability of the model, and then the response time of the model is analyzed by using the Routh criterion. The control method and parameters in simulation are described. In the environment of simulation,the high voltage level is 110 k V, the output voltage of the wind turbine is690 V, the 35 k V bus is selected to carry on centralized reactive power compensation. The simulation results show the effectiveness of the control program and the model. This method is intuitive and easy to understand,suitable for beginners to grasp the core of control theory.