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Fractional frequency transmission wind power generation system and method based on isolation type variable frequency transformer

A technology of wind power generation system and frequency conversion transformer, which is applied in wind power generation, electrical components, circuit devices, etc., and can solve problems such as complex topology, high difficulty in control, and high cost

Active Publication Date: 2019-08-27
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technology requires power electronic conversion of all wind power, and large-scale power electronic devices are required to realize large-scale wind power access, which has complex topology, high cost, low reliability, and high difficulty in control

Method used

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  • Fractional frequency transmission wind power generation system and method based on isolation type variable frequency transformer
  • Fractional frequency transmission wind power generation system and method based on isolation type variable frequency transformer
  • Fractional frequency transmission wind power generation system and method based on isolation type variable frequency transformer

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Embodiment

[0046] The invention includes an overall system scheme, a starting method and a maximum power tracking control method for a wind farm to be connected to a power grid through an isolated frequency conversion transformer.

[0047] Part 1: The overall system scheme of the frequency division transmission wind power generation system composed of isolated frequency conversion transformers

[0048] Based on the constant voltage-to-frequency ratio characteristic of the secondary port voltage of an isolated frequency conversion transformer, the present invention proposes a system scheme and a control method for centralized frequency conversion of a wind farm and transmission of electricity through frequency division.

[0049] The overall system solution includes wind turbines, wind farm intranet, wind farm step-up transformers (optional), low-frequency AC transmission lines, step-down transformers (optional), isolated frequency conversion transformers (or multiple sets of isolated frequ...

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Abstract

The invention relates to a fractional frequency transmission wind power generation system and method based on an isolation type variable frequency transformer. The isolation type variable frequency transformer is of concentrated variable frequency of a wind power plant, and variable speed operation and maximum power tracking of a whole wind power generation set are realized, so that a frequency converter does not need to be configured for each single wind power generation set, the technology is applied to wind power generation, the system can be simplified greatly, the reliability is improved,only small converter capacity is needed, the system has the advantages of fractional frequency transmission in the aspect of long-distance power transmission, and the system is particularly applicable for offshore wind power with far offshore distance. The invention discloses a novel wind power system scheme, a starting method under the system scheme, and a maximum power tracking control method.Compared with the prior art, the system has the advantages of low cost, high reliability, high stability, few harmonic waves inside a wind power plant and the like.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a frequency division transmission wind power generation system and method based on an isolated frequency conversion transformer. Background technique [0002] Currently commercial variable-speed wind turbines use a single wind turbine for independent frequency conversion and then connect to the constant-voltage and constant-frequency power grid. Each wind turbine needs to be equipped with an independent converter. The low-voltage converter commonly used in existing wind turbines is the key factor restricting the unit's outlet voltage, while the medium-voltage converter is expensive, and its technology maturity and control reliability are far lower than low-voltage inverters. In addition, a large number of converters composed of power electronic devices are scattered in the wind farm, resulting in poor reliability and high operation and maintenance costs. In the off...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386Y02E10/76
Inventor 贾锋符杨
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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