Research on Voltage/reactive Power Control Strategy of Wind Farm Integrated Power System
|School||North China Electric Power University|
|Course||Proceedings of the|
|Keywords||DFIG Nonlinear control Decoupling Control Sensitivity|
With the growing energy consumption and the environment continues to deteriorate, the world as a new clean energy renewable non-polluting sustainable development priorities. Wind energy is an inexhaustible, pollution-free, with large-scale energy development and utilization prospects. Wind power is the most mature technology in new energy, power generation, one of the largest development conditions and prospects for commercial development. The VSCF run wind turbines include: double-fed induction wind generator and direct-drive wind turbines. In the new installation of variable speed constant frequency wind turbine, accounted for a large proportion of the doubly fed induction generator. On the one hand due to the relationship between the doubly fed induction generator rotor and stator electromagnetic converter simply supply the slip power can adjust the speed of the wind turbines, the largest wind energy capture, greatly reducing the variable speed wind power generation system the rated capacity of the converter; on the other hand, the power generation system can be achieved by changing the amplitude and phase of the excitation current independently adjust the generator output active power, reactive power, so you can ensure that wind power plants run on a unity power factor to reduce power system losses. Firstly VSCF doubly fed induction wind turbines in abc stationary reference frame dq rotating coordinate system under dynamic mathematical model; study the power characteristics, and laid the foundation for the subsequent content. Second, nonlinear mathematical model and network side converter (GSC) for the rotor-side converter (RSC), the characteristics of strong coupling, study the nonlinear decoupling control strategy based on state feedback precise linearization doubly fed induction generator nonlinear decoupling control and Matlab / simulink simulation. The simulation results show that the proposed control strategy can achieve double-fed wind generator active and reactive power decoupling, and improve the dynamic response of the doubly-fed wind turbine. Improve wind power the access regions voltage stability DFIG-based wind farm reactive power control strategy. First derivation nodes inject reactive with node voltage sensitivity, and the sensitivity of the expression of the relationship between the node issued reactive power and voltage fluctuations. Wind farms, wind farm reactive power to control the amount of steady-state value of the node voltage control objectives to achieve control the wind farms node voltage. Simulation examples show that this method can effectively suppress voltage fluctuations of the wind farm access areas.