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Method for depicting real-time change rate of wind speeds

A change rate and wind speed technology, applied in the field of wind speed change characterization, can solve the problems of characterization indicators, no wind speed change rate, etc., to achieve the effect of maintaining balance and stability, and maintaining power

Active Publication Date: 2016-02-03
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the reserve capacity of the power system needs to describe the change rate of wind power in the process of stabilizing wind power fluctuations, and there is currently no description index for the change rate of wind speed

Method used

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  • Method for depicting real-time change rate of wind speeds
  • Method for depicting real-time change rate of wind speeds
  • Method for depicting real-time change rate of wind speeds

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Experimental program
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specific Embodiment approach 1

[0038] Specific implementation mode one: combine figure 1 To describe this embodiment,

[0039] A method for describing the real-time change rate of wind speed, comprising the following steps:

[0040] Step 1: Define the real-time change rate description index of wind speed The expression of is as follows:

[0041] Δ v · ( t , Δ t ) = 1 N Σ i = 1 N [ v ( t i + Δ t ) - v ( t i ) ...

specific Embodiment approach 2

[0051] Specific implementation mode two: the pair sequence S described in this implementation mode i When performing wavelet decomposition, the sequence S i Carrying out 9-level wavelet decomposition, the obtained low-frequency component is an hour-level component, which is equivalent to the sequence S i Do an hour-level average processing to obtain the required real-time change rate of wind speed to describe the time series of indicators

[0052] Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0053] Specific implementation mode three: the pair described in step two of this implementation mode and hourly average wind speed The fitting process is as follows:

[0054] Delineate indicators according to the real-time change rate of wind speed The hourly average wind speed corresponding to its moment The multi-scale amplitude modulation relationship, and then the and hourly average wind speed Fitting is performed, and then determined according to the fitting result and hourly average wind speed the relationship between, yes and hourly average wind speed Fitting is performed to obtain a power law fitting model.

[0055] Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method for depicting the change of wind speeds, in particular to a method for depicting the real-time change rate of the wind speeds. The method aims at solving the problems that the reserve capacity of an electric system needs to depict the change rate of the wind speeds in the wind power fluctuation stabilizing process, and at present, no depicting indexes about the change rate of the wind speeds are available. According to the method, firstly, depicting indexes, shown in the specification, about the real-time change rate of the wind speeds are defined, Si is equal to the value of [v9ti+delta t]-v(ti)]2, the sequence Si is subjected to wavelet decomposition based on a wavelet multi-scale conversion algorithm, a time sequence, shown in the specification, of the depicting indexes of the real-time change rate of the wind speeds is obtained, the multi-scale amplitude modulation relation between the depicting indexes, shown in the specification, in the real-time change rate of the wind speeds at various moments and hour-level average wind speeds, shown in the specification, corresponding to the moments is analyzed, the value shown in the specification and the hour-level average wind speeds shown in the specification are fit, and a power law fit model is obtained; the depicting indexes, shown in the specification, about the real-time change rate of the wind speeds are quantitatively determined according to the hour-level average wind speeds shown in the specification according to the obtained power law fit model, and then the real-time change rate of the wind speeds is quantitatively depicted. The method is suitable for guiding a power grid to conduct operational control and optimal scheduling.

Description

technical field [0001] The invention relates to a description method of wind speed change. Background technique [0002] With the depletion of traditional fossil energy and the continuous growth of energy demand, wind power, as one of the most promising new energy sources in renewable energy, has been favored and valued by more and more countries. However, compared with traditional power generation methods, wind has the characteristics of randomness, volatility, and intermittence. After large-scale wind power grid integration, a strong random uncertainty film is injected into the power generation side of the grid, which affects the stable and safe operation of the grid. Therefore, it is very necessary to predict wind speed and wind power, and this has become a research hotspot and technical need in the wind power industry. At present, wind power forecasting is divided into deterministic forecasting and uncertain forecasting. The forecast results of deterministic forecast g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 万杰任国瑞赵鑫宇刘鑫刘金福于达仁
Owner HARBIN INST OF TECH