Fault ride-through control system of offshore wind power series grid connection and control method thereof

A control system and fault ride-through technology, applied in wind power generation, electrical components, circuit devices, etc., can solve the problems of increasing control complexity and increasing system cost, reducing loss and heat generation, simplifying system structure, and improving available time. Effect

Inactive Publication Date: 2016-02-24
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the control complexity increases, but it will increase the system cost

Method used

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  • Fault ride-through control system of offshore wind power series grid connection and control method thereof
  • Fault ride-through control system of offshore wind power series grid connection and control method thereof
  • Fault ride-through control system of offshore wind power series grid connection and control method thereof

Examples

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Embodiment 1

[0043] The invention of this example provides a fault ride-through control system and control method for offshore wind power series grid-connected, the control system, as attached figure 1 As shown, its topological structure is the topological structure diagram of the DC fan grid-connected system based on the chain structure adopted in the present invention, and the control system includes at least one DC fan, an energy storage unit and corresponding power electronic sub-modules, An auxiliary power loop (LC oscillating loop), an output inductor, a current detection unit, a voltage detection unit and a controller.

[0044] Wherein the DC fan can be a double-fed DC fan or a direct-drive DC fan, and its topology is as follows image 3 shown. The doubly-fed DC fan includes a doubly-fed wind power generator set and a full-power converter, and the direct-drive DC fan includes a direct-drive fan and a full-power converter.

[0045] The full power converter includes a three-phase ha...

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PUM

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Abstract

The present invention relates to a fault ride-through control system of offshore wind power series grid connection and a control method thereof. The control system comprises a DC fan, an energy storage unit which is connected to the DC fan in series, an auxiliary power loop, an output inductor, a current detection unit, a voltage detection unit and a controller. The current detection unit is used for detecting the current of the system. The voltage detection unit is used for detecting the voltage of the system. According to the controller, the low voltage ride-through of the system is realized in the needed condition according to the detected current and voltage. The auxiliary power loop is used for regulating the output voltage of the controller such that the output power of the DC fan is stored in the energy storage unit. The output inductor is used for filtering the output voltage of the DC fan. According to the technical scheme of the invention, the offshore wind power low voltage fault ride-through ability requirement is satisfied, and the reliability of an offshore wind power system is improved.

Description

Technical field: [0001] The invention relates to the field of offshore wind power systems, and more specifically relates to a fault ride-through control system and a fault ride-through control method for offshore wind power series grid-connected with an auxiliary power loop. Background technique: [0002] In the power system, with the continuous improvement of the penetration rate of wind power generation, the requirements of the power grid for the characteristics of wind turbines are also continuously improved. Grid-connected guidelines require that grid-connected wind turbines must have low voltage ride through (LVRT) capability, that is, within a certain time range when a low voltage fault occurs in the grid, not only the generator is not allowed to go off-grid, but also a certain capacity must be provided to the grid. Reactive power support to help restore the grid voltage. [0003] At present, the countermeasures for low voltage ride through of wind turbines are as fol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/001H02J3/32H02J3/386Y02E10/76Y02E70/30
Inventor 曹远志姚良忠丁杰杨波李琰庄俊卢俊峰崔红芬陶以彬冯鑫振李官军周晨鄢盛驰胡金杭刘欢朱红保李跃龙
Owner CHINA ELECTRIC POWER RES INST
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