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

A technology of active disturbance rejection control and wind turbines, which is applied in the control of generators, motor generators, and electromechanical brakes, and can solve problems such as poor control effects.

Inactive Publication Date: 2011-02-16
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

At present, the decoupling method in the wind power system has the traditional PI control algorithm, such as figure 1 As shown, the control effect of this method is not very good, mainly because based on the traditional linear feedback, only part of the decoupling of the flux subsystem in the dynamic process is realized, and the flux subsystem still contains the flux term

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

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Embodiment

[0030] Active disturbance rejection control block diagram of active and reactive power decoupling control ( figure 2 ). For the active power, when the wind speed changes, the power setting of the controller follows the change of the wind energy, and when the wind speed increases, the active power setting of the controller increases. The initial condition of the simulation system is that when the output power is stable at 998W, the wind speed suddenly increases from 12 m / s to 14 m / s in 0.5 seconds, and the reactive power is set as 0. Motor parameter selection is the same as grid-connected control. Take the configuration pole as (-5, -5, -5). The inventive method at least comprises the following steps:

[0031] Step A, ADRC consists of three parts: differential tracker, nonlinear combination, and extended state observer. Fine-tune the ADRR parameters, and the final parameters track the differentiator r=10, h=0.005. The other parameters of the extended state observer are α1...

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Abstract

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.

Description

【Technical field】 [0001] The invention relates to a brushless doubly-fed wind generator (DFIG) decoupling of an Active-Disturbance-Rejection Control (ADRC) technology, belonging to the technical field of wind power generation control. 【Background technique】 [0002] The energy density of wind energy is relatively low. At present, wind power generation faces an urgent problem to be solved - the improvement of wind energy utilization efficiency. Wind turbines have nonlinear aerodynamic characteristics and a wide range of operating wind speeds. In addition, the flexible structure of the energy transfer chain and the influence of mechanical damping that changes with the speed make the control of wind power generation systems a difficult problem. The variable speed constant frequency power generation system can allow the wind turbine to run at variable speed within a certain range. Since some parameters of the brushless double-fed generator change with the rotor speed, the dynami...

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Application Information

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IPC IPC(8): H02P9/48H02P21/14
Inventor 马幼捷于阳周雪松李超刘进华刘一琦
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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