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Multi-terminal VSC-HVDC grid-connected transmission system controlling method applied to wind power plant

A VSC-HVDC, transmission control technology, applied in the field of multi-terminal VSC-HVDC grid-connected transmission control system, can solve problems such as VSC-HVDC system paralysis

Inactive Publication Date: 2013-12-18
HUNAN UNIV
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Problems solved by technology

[0004] Most of the existing light-duty DC transmission systems use two-port DC transmission, that is, there is only one rectifier station (sending end) and one inverter station (receiving end). Once one of the VSC converter stations fails and exits, the VSC-HVDC system will paralyzed

Method used

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  • Multi-terminal VSC-HVDC grid-connected transmission system controlling method applied to wind power plant
  • Multi-terminal VSC-HVDC grid-connected transmission system controlling method applied to wind power plant
  • Multi-terminal VSC-HVDC grid-connected transmission system controlling method applied to wind power plant

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Embodiment Construction

[0039] Further illustrate the present invention below in conjunction with accompanying drawing.

[0040] Wind farm grid side converter station control

[0041] According to the theory of instantaneous reactive power, the instantaneous active power P and instantaneous reactive power Q flowing through the VSC converter station in the abc three-phase stationary coordinate system are respectively

[0042] { P = u s a i s a + u s b i s b ...

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Abstract

The invention discloses a multi-terminal VSC-HVDC grid-connected transmission system controlling method applied to a large wind power plant. Wind power plant side convertor station outer ring power conducts inner ring current PI control, a grid field side convertor station outer ring direct voltage conducts inner ring current feedback linearization decoupling control, and therefore response characteristics and dynamic performance of a controller are improved. When operation of the wind power plant fluctuates greatly and a system loses capacity for adjusting the direct voltage, multi-terminal direct voltage control of direct voltage deviation is led into other convertor stations of the wind power plant for replacing a grid side convertor station to execute a voltage regulating task, therefore, power balance is maintained, normal operation of the system is ensured, and the effect that the system operates stably at a new operating point is also ensured.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a multi-terminal VSC-HVDC grid-connected transmission control system applied to wind farms. Background technique [0002] The wind farm adopts VSC-HVDC power transmission technology. The system can not only supply power to the active network, but also flexibly and independently control active power and reactive power at the same time. It can also directly connect weak AC power networks with small short-circuit capacity or even passive network systems. VSC can function as a static var compensator, dynamically compensates the reactive power of the AC bus, and stabilizes the voltage of the AC bus; it adopts high-power full-control switching devices such as IGBT, which has convenient commutation, fast switching adjustment, and low harmonic content. Its power transmission capacity ranges from a few MW to several hundred MW. Since wind farms are usually located in relatively remote are...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/36
CPCY02E10/76Y02E60/60
Inventor 王辉汪小黄守道李孟秋高剑
Owner HUNAN UNIV
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