Method of controlling reactive voltage at grid connection point of wind power plant

A voltage control method and point voltage control technology, which is applied in AC network voltage adjustment, wind power generation, reactive power compensation, etc., can solve the problem of limited reactive power adjustment capacity of wind turbines, and achieve good regulation and control effects, accounting for small area effect

Active Publication Date: 2015-06-10
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology

[0002] At present, most large-scale wind farms operate in the constant power factor mode, and the reactive power adjustment capability of the wind turbine itself is very limited. The voltage regulation of the grid-connected point of the wind farm can only rely on the reactive power compensation device of the step-up station and the voltage regulation of the on-load voltage regulating transformer. accomplish

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  • Method of controlling reactive voltage at grid connection point of wind power plant
  • Method of controlling reactive voltage at grid connection point of wind power plant

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Embodiment

[0025] Reactive power and voltage control of wind farm grid-connected points, that is, each wind farm grid-connected point uses the installed reactive power compensation equipment to perform reactive power and voltage control. According to national regulations, each wind farm grid-connected point should be equipped with various reactive power compensation equipment, such as shunt capacitors, reactors, SVC, SVG, etc., and the transformer of the wind farm step-up station should be an on-load regulating transformer.

[0026] The active output of the wind farm has strong fluctuation and instability, and the fluctuation range of the active output of the wind farm has a great influence on the voltage characteristics of the grid-connected point of the wind farm. When the active output of the wind farm varies greatly, the voltage fluctuation of the grid-connected point of the wind farm is also large. The wind power output may rise or fall rapidly and greatly in a relatively short peri...

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Abstract

The invention relates to a method of controlling a reactive voltage at a grid connection point of a wind power plant; the method is adopted to adjust the reactive voltage at the grid connection point of the wind power plant and comprises the following steps: (1) measuring a rated voltage UN at the grid connection point of the wind power plant, setting a voltage control and setting range of the grid connection point of the wind power plant to be 1.0-1.06 UN and controlling a setting value to be 1.04UN; (2) predicting the output of the wind power plant according to a real-time voltage U at the grid connection point of the wind power plant; (3) primarily controlling the reactive voltage at the grid connection point of the wind power plant by means of a capacitor switching-on / switching off manner according to the real-time voltage U and the predicted output of the wind power plant, and meanwhile, utilizing SVG (Scalable Vector Graphics) to perform precise control. Compared with the prior art, the method has the advantages of being good in control effect, advanced in technology and low in cost and the like.

Description

technical field [0001] The invention relates to a reactive power voltage control method, in particular to a reactive power voltage control method of a grid-connected point of a wind farm. Background technique [0002] At present, most large-scale wind farms operate in the constant power factor mode, and the reactive power adjustment capability of the wind turbine itself is very limited. The voltage regulation of the grid-connected point of the wind farm can only rely on the reactive power compensation device of the step-up station and the voltage regulation of the on-load voltage regulating transformer. accomplish. The voltage at the grid-connected point of the wind farm has a strong correlation with the level of active output. When the active output of the wind farm increases, the reactive power loss and voltage loss on the wind power feeder and transformer increase. The voltage of the grid-connected point of the wind farm is due to reactive power When the active output of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16
CPCH02J3/16H02J3/386H02J3/50Y02E10/76Y02E40/30
Inventor 费斐李亦农张旭航庞爱莉张中言胡晓光周明欧阳荭一赵晶晶
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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