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Idle grid connection control method for speed variant frequency constant dual feedback asynchronous wind power generator set

A wind power generation unit, double-fed asynchronous technology, applied in the direction of generator frequency and voltage control, single-grid parallel feeding arrangement, etc., can solve the problem of low success rate of grid connection, long time of grid connection, and weak robustness To achieve the effect of shortening the grid connection time, suppressing the impact of grid connection, and improving the success rate of grid connection

Inactive Publication Date: 2009-08-05
TIANJIN UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0006] The above-mentioned existing no-load grid-connection control method has the following defects: it cannot suppress the impact of doubly-fed asynchronous motor parameter disturbance on grid-connection, the robustness of the entire system is not strong, the grid-connection time is long, and the success rate of grid-connection is not high

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  • Idle grid connection control method for speed variant frequency constant dual feedback asynchronous wind power generator set
  • Idle grid connection control method for speed variant frequency constant dual feedback asynchronous wind power generator set
  • Idle grid connection control method for speed variant frequency constant dual feedback asynchronous wind power generator set

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Embodiment Construction

[0025] A variable-speed constant-frequency doubly-fed asynchronous asynchronous wind power generating set no-load grid-connected control method, characterized in that the method includes a doubly-fed asynchronous motor stator voltage negative feedback and rotor current negative feedback double closed-loop control method, the specific steps are:

[0026] (1) Negative feedback of the stator voltage is characterized in that it is composed of the following steps:

[0027] ① Detect and calculate the amplitude of the phase voltage of the stator winding of the double-fed electric machine (7), and obtain the ratio of the amplitude to the detected phase voltage amplitude of the grid-connected node of the power grid (1);

[0028] ② The product of the ratio and the three-phase voltage space vector amplitude of the grid-connected node of the grid (1) is used as the feedback value of the voltage negative feedback loop, and the three-phase voltage space vector amplitude of the grid-connected...

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Abstract

The invention provides a method for controlling the empty-load grid-connection of a variable-speed constant-frequency double-fed asynchronous wind-driven generating set. The method is characterized in that the method comprises a double closed loop control method for the negative feedback of the stator voltage of the double-fed asynchronous motor and the negative feedback of the rotor current; and has the advantages of effectively inhibiting the effects of the parameter disturbance of the double-fed asynchronous motor on the grid connection, obviously shortening the grid-connection time and greatly improving the success rate of the grid connection.

Description

(1) Technical field: [0001] The invention relates to a control method of a variable-speed constant-frequency double-fed asynchronous wind power generating set, in particular a variable-speed constant-frequency double-fed asynchronous wind power generating set no-load grid-connected control method. (two) background technology: [0002] The variable-speed constant-frequency doubly-fed asynchronous wind power generating set no-load grid-connected control method in the prior art includes: an open-loop control method without feedback and a closed-loop control method including d-axis current feedback. [0003] figure 2 and image 3 It is a schematic diagram of the no-load grid connection control method in the prior art. [0004] Such as figure 2 As shown, firstly, the voltage of the power grid (1) and the speed of the doubly-fed machine (7) are detected, and after data processing is carried out through the control algorithm in the controller (10), the reference value of the thr...

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Application Information

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IPC IPC(8): H02J3/38H02P9/44
Inventor 马幼捷尹向前周雪松周永兵许立瑾张书瑞
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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