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Control Method of Integral Sliding Mode Controller for Doubly-fed Wind Power Generation System Based on ESO

A doubly-fed wind power generation and control method technology, applied in the field of power systems, can solve problems such as damaging system performance, variation, and affecting control system accuracy

Inactive Publication Date: 2018-09-14
XIAN UNIV OF TECH
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Problems solved by technology

Chattering affects the accuracy of the control system, increases energy loss, damages the performance of the system, and even causes the system to oscillate or deteriorate stability

Method used

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  • Control Method of Integral Sliding Mode Controller for Doubly-fed Wind Power Generation System Based on ESO
  • Control Method of Integral Sliding Mode Controller for Doubly-fed Wind Power Generation System Based on ESO
  • Control Method of Integral Sliding Mode Controller for Doubly-fed Wind Power Generation System Based on ESO

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Embodiment Construction

[0065] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0066] The present invention is based on the control method of the integral sliding mode controller of the doubly-fed wind power generation system of ESO, specifically implements according to the following steps:

[0067] Step 1, write down the mathematical model of the doubly-fed motor in the rotating coordinate system:

[0068] Voltage equation:

[0069]

[0070] Among them, u ds , u qs , u dr , u qr are the stator and rotor voltage (d, q) axis components of the doubly-fed motor, respectively; ω 1 is the power frequency angular velocity; i ds i qs i dr i qr are the stator and rotor current (d, q) axis components of the doubly-fed motor; R s , R r are the stator and rotor resistances; p is the differential operator; ω 1 -ω r is the angular velocity of the rotating two-phase (d,q) coordinate system relative to the rotor;

[0...

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Abstract

The invention discloses an ESO-based control method of a double-fed wind power generation system integral sliding mode controller, and is implemented according to the following steps: first a mathematical model of a double-fed wind power generation system is written; after the mathematical model is obtained, on this basis an extended state observer based on the double-fed wind power generation system is designed according to the principle of the extended state observer; then, a switching function of a controller of a sliding mode variable structure is determined; and finally, according to a control objective that a system error is reached in limited time and maintained on a sliding mode surface, the sliding mode control law is obtained. Feasibility of the strategy is verified through simulation. According to the ESO-based control method of the double-fed wind power generation system integral sliding mode controller, the extended state observer-based sliding mode variable structure control strategy is researched, thereby realizing decoupling control in the running process of the double-fed wind power generation system, improving corresponding speed of the system, and enhancing parameter robustness of the system.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and relates to a control method of an integral sliding mode controller of an ESO-based doubly-fed wind power generation system. Background technique [0002] Doubly-fed motor has the characteristics of asynchronous generator and synchronous generator, wide speed range, high utilization rate of wind energy, and can efficiently output electric energy to the grid, so it has excellent development prospects in wind power generation systems. However, the DFIG is a nonlinear, strongly coupled electromechanical system, and the traditional control strategy adopts vector control, which is based on an approximate linear model, which cannot describe the nonlinear nature of the DFIG system, resulting in vector The DFIG control performance of the control is degraded. [0003] The controllers currently used in doubly-fed asynchronous generators include: through the traditional PI controller, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/13H02P9/00H02P101/15H02J3/38
CPCY02E10/76
Inventor 李生民陆梦云韩钊王季龙
Owner XIAN UNIV OF TECH
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