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Noise-like signal-based wind farm potential subsynchronous oscillation identification method

A technology of subsynchronous oscillation and identification method, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of subsynchronous oscillation, damage to the unit, and inability to know the specific parameters of the transmission line immediately, and achieve the effect of easy implementation and risk reduction.

Active Publication Date: 2018-08-10
CENT SOUTH UNIV
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Problems solved by technology

However, the current method of adding series compensation capacitors to long-distance large-capacity transmission lines to improve the transmission capacity of the system may cause sub-synchronous oscillation (Sub-synchronous Oscillation) of the wind farm, resulting in damage to the unit
Since the wind farm is on the power generation side, the specific parameters of the transmission line cannot be known in real time, so it will face the potential risk of subsynchronous oscillation at any time

Method used

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  • Noise-like signal-based wind farm potential subsynchronous oscillation identification method
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  • Noise-like signal-based wind farm potential subsynchronous oscillation identification method

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Embodiment Construction

[0024] The wind farm-series compensation network model is built through SIMULINK, and the subsynchronous oscillation of the wind farm can be observed through the electromagnetic torque Tem of the wind farm. figure 1 In order to simulate two types of wind farm-like noise signals with sub-synchronization information generated, the two types of noise signals are generated by two different small disturbances (1) load switching and (2) wind speed fluctuation, and are masked by the noise signals.

[0025] against figure 1 For the signal shown, the present invention adopts the wavelet decomposition method to further extract the effective information in the noise-like signal. Extraction flow chart such as figure 2 shown. Taking the noise-like signal generated by load switching as an example, the specific extraction steps are as follows:

[0026] Step-1 For the noise-like signal X(t) generated by load switching, select the sym5 wavelet base to decompose the signal by wavelet. Sinc...

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Abstract

The invention discloses a noise-like signal-based wind farm potential subsynchronous oscillation identification method. A subsynchronous oscillation frequency range is estimated according to an actualsituation; noise-like signals are extracted from a wind farm; through carrying out wavelet decomposition and reconstruction on the noise-like signals, extraction signals in the needed subsynchronousoscillation frequency range are acquired; and through carrying out mode identification on the extraction signals, wind farm potential subsynchronous oscillation mode information is acquired. Line parameters and a wind farm subsynchronous oscillation mode can be acquired accurately from normal operation data of the wind farm, early warning can be carried out on wind farm potential subsynchronous oscillation risks, and the operation mode of the wind farm can be adjusted timely.

Description

technical field [0001] The invention relates to a method for identifying potential subsynchronous oscillation of a wind farm based on a noise-like signal. Background technique [0002] Since China's total installed wind power capacity reached 44.7 million kilowatts in 2010, my country's wind power installed capacity has always ranked first in the world. Due to the characteristics of wind energy distribution, wind farms are generally far away from power consumption areas. At present, adding series compensation capacitors in long-distance and large-capacity transmission lines to improve the transmission capacity of the system may cause sub-synchronous oscillation of the wind farm, resulting in damage to the unit. Because the wind farm is on the power generation side, the specific parameters of the transmission line cannot be immediately known, so it will face the potential risk of subsynchronous oscillation at any time. [0003] For a wind farm in normal operation, a lot of ...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 刘芳马俊杰刘玲李勇
Owner CENT SOUTH UNIV
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