Brushless double-fed wind driven generator decoupling method based on active-disturbance-rejection control (ADRC) technology

The invention discloses a brushless double-fed wind driven generator decoupling method based on an active-disturbance-rejection control (ADRC) technology. Aiming at problems of the structural complexity and convertibility along with environmental of a brushless double-fed motor, poor application of the traditional PID control in BDFM, and the like, the invention provides an expand observer-based non-linear PID control-ADRC method to achieve decoupling control on the active power and reactive power of a wind driven generating system. In the method, torque T of a wind turbine as well as the active power and the reactive power at a stator side are respectively used as quantities of sate to be input to form nonlinear and coupling items which are considered as interior disturbance quantities of ADRC, a reference quantity xref is set in a differential-tracker, and nonlinear feedback control is formed through configuration. An NLSEF utilizes the error between the input of a TD and the input of an ESO to generate a control quantity so that a mathematical model of a generator can obtain rotate speed and flux linkage subsystems after nonlinear state feedback is carried out so as to achieve the complete decoupling of the two subsystems in the dynamic process.