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Doubly-fed wind turbine generator high-voltage ride through control system and working method thereof

A doubly-fed wind turbine and control system technology, applied in control systems, generator control circuits, wind power generation, etc., to achieve the effects of improving stability, good economic benefits, and low hardware requirements

Pending Publication Date: 2021-01-15
华能山东发电有限公司牟平风电分公司 +3
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Problems solved by technology

[0004] Although the high-voltage ride-through capability of wind turbines is not a mandatory requirement of the power grid, in order to improve the stability and safety of the power system operation, the high-voltage ride-through capability of wind farms will gradually become an inevitable requirement of the power grid

Method used

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  • Doubly-fed wind turbine generator high-voltage ride through control system and working method thereof
  • Doubly-fed wind turbine generator high-voltage ride through control system and working method thereof
  • Doubly-fed wind turbine generator high-voltage ride through control system and working method thereof

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, which are explanations of the present invention rather than limitations.

[0032] When the grid voltage swells symmetrically, there will be attenuated DC components in the stator flux linkage, and for asymmetrical voltage swells, the stator flux linkage will also have negative sequence components, and the DC components and negative sequence components are relatively A large slip ratio is formed, which in turn causes overcurrent and overvoltage on the rotor side, and eventually damages the rotor side converter. The sudden rise of the grid voltage will cause the weakening of the converter's ability to control the DC voltage and other links, which may cause damage to the DC bus capacitor. For the fan system, it will cause insulation aging or insulation decline in the weak link of insulation, and in severe cases, it will cause insulation br...

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Abstract

The invention discloses a doubly-fed wind turbine generator high-voltage ride through control system and a working method thereof, and belongs to the technical field of wind power generation. A Crowbar circuit is connected between the rotor of a doubly-fed wind generator and the machine side of a converter, and an unloading circuit is arranged on a direct current bus between the machine side and the grid side of the converter; and the converter, the Crowbar circuit and the unloading circuit are respectively connected with the converter controller, and the converter controller is connected to amain control system of the doubly-fed wind turbine generator. Through the converter, the converter controller, the Crowbar circuit and the unloading circuit, the problems of overvoltage, overcurrent,direct current bus voltage rise and the like in the voltage rise transient process can be solved when the doubly-fed wind turbine generator generates high-voltage ride-through, so that the generatoris safe, stable and free of off-grid in the high-voltage ride through period, and normal operation and power generation of the wind turbine generator are ensured. The system is reasonable in design, easy to construct and low in hardware requirement, the stability and safety of the system are guaranteed, and good economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a high-voltage ride-through control system of a doubly-fed wind turbine and a working method thereof. Background technique [0002] As the installed capacity of wind power increases year by year, the randomness and volatility of wind energy itself lead to huge challenges in peak regulation, voltage regulation, frequency regulation and power quality of the power grid, and put forward higher requirements for the safe operation of the power grid. According to the statistics of power grid accidents of the power grid company, when the power grid has a serious voltage failure due to some reason, it will cause a large area of ​​wind turbines to go off-grid. In the fault recovery stage of the low-voltage fault of the wind farm grid, because the reactive power compensation of the wind turbine is not withdrawn in time, it may cause overvoltage of the grid-connecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J9/06H02H7/26H02P9/00H02P9/10
CPCH02H7/26H02J3/381H02J9/06H02P9/007H02P9/102H02P9/105H02P2101/15H02J2300/28Y02B10/70Y02E10/76
Inventor 马宏怡刘孟军隋树波吕建波杨亮刘鹏程何兆兰王军刘牧王健壮王献文焦冲郭辰刘鑫
Owner 华能山东发电有限公司牟平风电分公司
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