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High voltage ride-through control method for double-fed fan after considering power constraint of converter

A power-constrained, doubly-fed wind turbine technology, applied in wind power generation, information technology support systems, single-grid parallel feeding arrangements, etc., can solve problems such as DC bus voltage fluctuations and grid-side current distortion, and achieve the effect of ensuring safe operation.

Inactive Publication Date: 2019-11-01
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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Problems solved by technology

[0019] In view of this, the purpose of the present invention is to propose a high-voltage ride-through control method for doubly-fed wind turbines after considering the power constraints of the converters, which solves the problem of DC bus voltage fluctuations and grid-side current distortions caused by overvoltages in the transient process. problem, ensuring the safe operation of the wind power system during fault ride-through

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  • High voltage ride-through control method for double-fed fan after considering power constraint of converter
  • High voltage ride-through control method for double-fed fan after considering power constraint of converter
  • High voltage ride-through control method for double-fed fan after considering power constraint of converter

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[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combina...

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Abstract

The invention relates to a high voltage ride-through control method for a double-fed fan after considering a power constraint of a converter. When a doubly-fed wind turbine encounters a high voltage of a system, the main control gives control of the wind turbine power to a converter, the controller performs control, and a DC unloading Chopper circuit connected on a DC bus in parallel is input to develop the high-through control; after the high voltage is over, the main control restores control of the wind turbine power. The high voltage ride-through control method solves the problems of DC busvoltage fluctuation and grid side current distortion due to the overvoltage in the transient process, and ensures the safe operation of the wind power system during the fault ride-through.

Description

technical field [0001] The invention relates to the technical field of grid-connected new energy power generation units, in particular to a high-voltage ride-through control method for a doubly-fed fan after considering the power constraint of a converter. Background technique [0002] Similar to voltage sag, voltage swell will also trigger a series of electromagnetic transient changes on the stator and rotor sides of the wind turbine. The stator side of the doubly-fed wind turbine is directly connected to the grid, and the sudden rise of the grid voltage will cause the change of the flux linkage between the stator and the rotor of the doubly-fed generator. Since the flux linkage cannot be mutated, transient DC components will appear in the stator and rotor windings. Due to the high-speed rotation of the rotor of the induction motor, the DC transient component will lead to an increase in the induced voltage and current in the stator-rotor circuit, and in severe cases, it wil...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/76Y04S10/52
Inventor 黄道姗李琰黄霆迟永宁徐振华汤海雁林焱田新首苏清梅苏媛媛张慧瑜刘超林因张小瑜陈伯建王志冰林芳刘宏志魏春霞胡健祖唐冰婕雷雨肖宇樊肖杰徐鹏超郑广泛张钦智王艺朱迅君
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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