Wind farm equivalent method based on wind farm input wind speed and wind direction chance fluctuation

Abstract

The invention discloses a method for establishing a wind farm random model based on factors such as wind farm input wind speed and wind direction chance fluctuation, wake flow effect between wind generating sets, an electric network in a wind farm and the like. The technical scheme comprises the following steps of: grouping the wind generating sets based on the wind farm wind speed and wind direction chance fluctuation; equating wind farm power according to a constant power exchange principle between the wind farm and a power grid before and after the equating; equating model parameters such as a generator of a wind generating set, a shaft system, a control system and the like according to a principle that the dynamic characteristic of the wind farm is constant before and after the equating; and keeping the detailed degree of an equivalent wind generating set model the same as that of a single wind generating set by rationally selecting an equivalent wind generating set reference value. When wind farm interconnecting analysis is performed by the model established by the method, the defects brought on the basis of the absence of the factors such as the wind farm input wind speed and wind direction chance fluctuation, the wake flow effect between the wind generating sets, the electric network and the like are overcome, and more accurate wind power data is provided for power grid dispatching and reasonable production plan arrangement.

Description

technical field [0001] The present invention relates to an equivalent method for grid-connected wind farms, in particular to a wind farm using constant-speed wind turbines, which considers random fluctuations in the input wind speed and wind direction of the wind farm, and is used for large-scale wind farms to be connected to the grid analyze. Background technique [0002] With the rapid development of wind power generation in my country in recent years, the research and evaluation of wind farm access to the power system, and the research on the ability of the system and key nodes to receive wind power are important issues that need to be solved urgently in the current development of wind power. From the perspective of the power system, the research on the wind farm is not concerned with the characteristics of each wind turbine inside the wind farm, but the dynamic characteristics of the wind farm as a whole and its impact on the power system. In the analysis, it is impossi...

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Problems solved by technology

[0024] (2) When establishing the wind farm model, factors affecting the output characteristics of the wind farm, such as the internal electrical network of the wind farm and the wake effect between wind turbines, were not considered

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