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Decoupling control method for nonlinear power of double-fed wind power generation system

A technology of doubly-fed wind power generation and power decoupling, which is applied in motor generator control, electronic commutation motor control, control system and other directions, and can solve the problem of dynamic power not decoupling.

Inactive Publication Date: 2013-04-03
SHANGHAI ELECTRICGROUP CORP
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Problems solved by technology

[0005] The purpose of the present invention is to provide a non-linear power decoupling control method for a doubly-fed wind power generation system, which solves the problem of non-decoupling dynamic power in the doubly-fed wind power generation control system in the prior art, thereby realizing a doubly-fed wind power generating set The dynamic and static complete power decoupling, and has the characteristics of intuitive, simple and easy to understand, which is convenient for popularization and application in engineering

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  • Decoupling control method for nonlinear power of double-fed wind power generation system

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with accompanying drawing.

[0050] First, a portion of the alphabetic symbols appearing below (including Figure 1 to Figure 8 The meaning of the contained symbols) is explained as follows:

[0051] u r Indicates the rotor voltage; u s Indicates the stator voltage; u sd , u sq are the d-axis and q-axis components of the stator voltage in the synchronous rotating coordinate system; u rd , u rq are the d-axis and q-axis components of the rotor voltage in the synchronous rotating coordinate system; u cd , u cq are the d-axis and q-axis components of the converter side voltage in the synchronous rotating coordinate system; U s is the grid voltage amplitude; u dc is the DC bus voltage; u gd and u gq Indicates the d-axis and q-axis components of the grid-side voltage in the synchronous rotating coordinate system;

[0052] i s Indicates the stator current; i r Indicates the rotor current; i rd...

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Abstract

The invention discloses a decoupling control method for the nonlinear power of a double-fed wind power generation system. The decoupling control method comprises the following steps of: establishing a double-fed wind power generation system state equation suitable for power decoupling control; and carrying out accurate linearization on the double-fed wind power generation system by adopting an input-output linearization theory through state feedback and coordinate transformation, thus realizing the high-performance power decoupling control on the double-fed wind power generation system. According to the nonlinear power decoupling control method, the problem that the dynamic power of the double-fed wind power generation system in the prior art is not decoupled is solved, thus the complete dynamic and static power decoupling of a double-fed wind generating set is realized.

Description

technical field [0001] The invention relates to the technical field of control of wind power generation, in particular to a nonlinear power decoupling control method for a doubly-fed wind power generation system. Background technique [0002] The control of doubly-fed wind turbines is realized through the control of dual-PWM converters. The usual control strategy is to divide the dual-PWM converters into grid-side converters and rotor-side converters (machine-side converters). converter) to control separately, the control target of the grid-side converter is mainly to keep the DC side voltage constant under the unit power factor. Since wind energy is a renewable energy with strong randomness and drastic changes, in the variable-speed constant-frequency double-fed wind power generation, the slip power is in a state of constant change. For the grid-side converter, it is actually its The load changes very drastically, which requires the grid-side converter to keep the DC side ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02P21/00
Inventor 张鲁华陈国栋董祖毅
Owner SHANGHAI ELECTRICGROUP CORP
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