The Development And Testing Of DFIG Control System Based On Labview

With the capacity of wind power increasing quickly,it's influence on the stability of the system is becoming more and more obvious.So it's important to study the way to improve the stability of the wind turbine operation furtherly.This thesis introduces the basic composition firstly,and then analyzes the fundamental principle of inverter control and its operation process.Then based on the experimental platform of Compact-RIO,with the control model by Labview,we completed the control of doubly fed induction generator(DFIG)successfully.At first,we realized the decoupling control of DFIG.Due to the intermittent of the wind,in order to realize the full use of wind power,it is important for DFIG being the ability of maximum wind power tracking(MPT).According to the different wind speed,the operation area of DFIG can be divided into five stages,and this dissertation especially analyzes the constant stage,the constant turbine speed stage and the constant power stage.Through the coordination of the power control and the pitch angle control,the MPT is achieved very well.Then this thesis analyzed the running characteristics of wind turbines,when the power grid voltage dropping.Through analyzing the variation of all related electric parameters during voltage sag and recovery,we got a method to determine the range of resistance value.And at last,the simulation was realized by RTDS,and compared with the experimental results.