Method for acquiring steady-state equivalent wind speed and generated power in wind power station based on correlation analysis

A technology of equivalent wind speed and power generation, which is applied in wind power generation, monitoring of wind turbines, wind turbines, etc., and can solve problems such as large measurement errors

Inactive Publication Date: 2010-03-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for calculating the steady-state equivalent wind speed and generating power of a wind farm based on correlation analysis, which solves the long-standing problem of large measurement errors in the prior art, and can more accurately calculate the equivalent wind speed of a wind farm. Wind speed and power generation, with the characteristics of high precision, simple method, convenient operation, etc.

Method used

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  • Method for acquiring steady-state equivalent wind speed and generated power in wind power station based on correlation analysis
  • Method for acquiring steady-state equivalent wind speed and generated power in wind power station based on correlation analysis
  • Method for acquiring steady-state equivalent wind speed and generated power in wind power station based on correlation analysis

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Embodiment

[0102] 1. Data source and preprocessing

[0103] The data used in this embodiment all come from an actual wind farm. The wind farm is equipped with 44 wind turbines, which are divided into two areas, A and B, with 22 wind turbines in each area. For example, figure 1 shown.

[0104] First, the average value of the opening and closing operations is used to form a hybrid filter mathematical morphology filter to filter the original data. The specific method is as follows:

[0105] The filtered output is

[0106] y(n)=[(f)hf(b)](n)=(fоb+f·b) / 2(1)

[0107] After morphological filtering, the number of wind turbines in the entire wind farm is reduced from 44 to 40, and the simulation results show that it can meet the analysis requirements. The sampling interval of the original data used in this example is 40 seconds, and the length is 12 hours. After preprocessing, there are 1080 pairs of data pairs consisting of the wind speed of each fan and the corresponding power generation pow...

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Abstract

The invention provides a method for acquiring steady-state equivalent wind speed and generated power in wind power station based on correlation analysis, belonging to the technical field of wind powergeneration. The method comprises the following steps: preprocessing the operational data in the wind power station; acquiring the steady-state equivalent wind speed in the wind power station by a correlation analysis method; forming a wind speed matrix, calculating correlated matrix of all unit wind speed in the wind power station, acquiring a characteristic value and a characteristic vector of the correlated matrix to obtain the equivalent wind speed finally; and acquiring the generated power in the wind power station, and the like. The method can accurately acquire the equivalent wind speedand generated power in the wind power station, and has the characteristics of high precision, simple method, convenient operation, and the like. The method has wide application range, and can be usedfor equivalent modeling of the wind power station, confirmation of the maximum penetration power of the wind power station, technique and system for predicating the generated power in the wind powerstation, reliability and economy application of the wind power station, analysis of influence of a wind power access network to the power system, and the like, and has great application value for planning and designing a wind power station access system.

Description

technical field [0001] The invention relates to the technical field of wind power generation. Background technique [0002] The calculation of the equivalent wind speed of existing wind farms mainly adopts the following methods: Akhmatov V and Knudsen H ("An aggregate model of grid connected large-scale offshore wind farm for power s stability investigations-importance of windmill mechanical system", Electrical Power and Energy System, 2002, 24(9): 709-717.) or Lang Binbin ("Interconnected Wind Power System Modeling and Simulation Analysis". Northeast Electric Power University, 2008.) proposed to use the average value of wind speed felt by all units in the entire wind farm as the equivalent wind speed. The proposal of this method provides a means for obtaining the equivalent wind speed of a wind farm. For a wind farm with a small number of wind turbines, this method is effective, but the actual wind farm occupies a huge area (such as Chifeng City Balin Zuoqi Wind Farm has ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00F03D9/00F03D9/25F03D17/00
CPCY02E10/72
Inventor 米增强余洋刘兴杰梅华威苏勋文孙蕾陈盈今
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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