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Wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition

An empirical mode decomposition and sub-synchronous oscillation technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve the problem of inability to reflect the instantaneous frequency of oscillation and damping characteristics, inability to provide active support for a long time, and inability to locate disturbance periods and other issues to achieve the effect of improving simplicity and flexibility

Inactive Publication Date: 2016-04-20
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology

Invention patent CN104009495A proposes a wind power subsynchronous oscillation suppression method, but its detection and suppression method is only for flexible direct current transmission systems, and cannot provide active support for a long time
Among them, the fast Fourier transform lacks the ability to analyze the local characteristics of the oscillation, and cannot reflect the instantaneous frequency and damping characteristics of the oscillation; the results of the wavelet analysis method are greatly affected by the basis function. The characteristics of the mode itself can adaptively locate the disturbance period, and the time-varying characteristics of the oscillation mode require follow-up work to extract

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  • Wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition
  • Wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition
  • Wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition

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Embodiment Construction

[0042] The present invention is described in detail below in conjunction with accompanying drawing:

[0043] In this example, the rated power of the wind farm is 40MW, and the AC bus voltage of the wind power is 110kV / 50Hz. The subsynchronous oscillation judgment, extraction and suppression of phase A current is taken as an example to illustrate.

[0044] refer to figure 2 , first, through the transformer set on the wind power grid-connected AC bus, the current of phase a is sampled, and the current obtained by sampling within a period of time t is stored as X(t).

[0045] refer to figure 1 , decompose and extract the sampled wind power signal through the following steps

[0046] Step (1): Sampling and storing the three-phase current of wind power grid-connected in real time.

[0047] Step (2): Treat the current sampled by each item as a time series, set the time series as X(t), and obtain all local extreme points;

[0048] Step (3): Find all the maximum points of the cur...

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Abstract

The invention discloses a wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition, comprising: employing an empirical mode decomposition algorithm to respectively rapidly decompose collected three phase current signals, respectively comparing the amplitude of each decomposed low frequency signal with a set value, and determining occurrence of subsynchronous oscillation according to comparison results. The subsynchronous oscillation decomposition and extraction method based on empirical mode decomposition can perform decomposition completely according to the self time scale characteristic of current signal data; a decomposition process more comprehensively extracts and maintains the main characteristics of an original signal, and meanwhile improves the conciseness and flexibility of signal expression.

Description

technical field [0001] The invention relates to the technical field of power system control, and is applicable to wind power subsynchronous oscillation detection and suppression, in particular to a wind power subsynchronous oscillation detection and suppression method based on empirical mode decomposition. Background technique [0002] The large-scale development of wind energy is an important part of my country's energy strategy. The reverse distribution of resources and load centers in my country makes the long-distance transmission of large-scale wind power inevitable. As two important ways to improve the stability limit of wind power system and improve the transmission capacity, power transmission is widely used in high-voltage transmission lines. However, when the degree of series compensation is high or when the subsynchronous control interacts with the induction power generation effect, electrical resonance with a frequency lower than the rated frequency may be generat...

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386Y02E10/76
Inventor 王瑞琪杨明辉马杰孙树敏韩德顺王昭鑫袁帅于芃李广磊赵鹏张用
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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