The Control Of Wind Turbine Generator System And The Analysis After On Grid

As a solution to the energy and environmental issues, an effective way, wind power is developing rapidly worldwide and becomes the world's fastest growing energy of renewable energies. Wind power generation in China is also coming into a period of rapid development. With the growth in installed capacity of wind power, the interaction and the mutual influence between wind turbine generator system and the power system will be more serious, and inevitably bring some new problems to the power system. Wind turbine generator system is also frequently disturbed by the change of wind speed, and has an impact to itself and the power system linked to them. Also the grid failure has a certain impact to the wind turbine. So knowing the interaction and the mutual influence between wind turbine generator system and the power system is an important guarantee for the system security and economic operation.To solve the above issues, this paper analyzes the mathematical models of the parts of the wind turbine generator system and the operation principle of the doubly-fed induction generator (DFIG) firstly. For the decoupling requirements of active power and reactive power, this paper establishes stator flux-oriented vector control strategy for DFIG.. In order to ensure wind turbine'safety and stable operation at high wind speed, this paper designs variable pitch control strategy. In order to further study, this paper establishes a simulation model for DFIG control system, and using this model simulates the control strategies of the DFIG and the dynamic response when wind speed changes.And the paper has an analysis for the interaction and the mutual influence between the wind turbine generator system and the power system after the wind turbine connected on grid. Under the fluctuations of wind speed, active power and reactive power injected the grid by the wind power generation system have been changed, so that terminal voltage of wind turbine changes. Under the circumstances of grid voltage drops and grid fault, the terminal voltage of wind turbine reduces, and the power also lowers. In the power grid failure to install reactive power compensation device simulation, the simulation results, compared to the above result, showed that, to some extent, reactive compensation can achieve the uninterrupted control.In this paper, the results indicate that the DFIG has many superior performances. The control strategy used in this article and the related analysis are feasible. With the growth in installed capacity of wind power, the analysis of the interaction after on grid in this paper has a certain degree of practical significance.