Method for controlling rotor-side converter of doubly fed induction generator (DFIG)

Abstract

The invention discloses a method for controlling a rotor-side converter of a doubly fed induction generator (DFIG). A vector control system consists of a torque inner ring control module, a voltage space vector modulation module, a rotating speed measurement module, a maximum wind energy capturing module and a first-order auto disturbance rejection controller (ADRC); a given DFIG rotor rotating speed output by the maximum wind energy capturing module and an actual DFIG rotor rotating speed measured by the rotating speed measurement module are sent into the ADRC; given reactive power, given stator flux linkage and expected electromagnetic torque output by the ADRC are sent into the torque inner ring control module; the rotor-side converter is controlled through the voltage space vector modulation module according to a rotor voltage vector modulation signal output by the torque inner ring control module. According to the method, parameters of the ADRC are optimized on line, so that the problem of large difficulty in debugging of the parameters of the ADRC is solved, the control accuracy of the ADRC is improved, and the operation stability of a power generation system is further ensured.

Description

technical field [0001] The invention relates to a method for controlling a converter on the rotor side of a doubly-fed induction wind generator (DFIG), belonging to the technical field of power generation. Background technique [0002] In recent years, wind power generation has received great attention as a green and new energy generation method. With the rapid development of wind power generation and power electronics technology, variable speed constant frequency wind power technology has occupied the mainstream position. [0003] Doubly-fed induction generator (DFIG) has been extensively studied as the mainstream type of variable-speed constant-frequency wind turbine. The working principle of the DFIG system is as follows: First, the wind turbine absorbs wind energy to generate mechanical torque, and then drives the DFIG rotor to rotate through the gearbox, thereby transmitting the mechanical power to the generator. The DFIG rotor winding is connected to the excitation c...

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Problems solved by technology

[0006] The purpose of the present invention is to aim at the drawbacks of the prior art, to provide a control method for the rotor-side converter of the doubly-fed induction wind power generator, to solve the problem that ADRC parameters are difficult to debug, and to improve the operation of the whole doubly-fed induction wind power generation system Accuracy and Stability

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