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A noise-like identification method for low-frequency oscillation characteristics of power systems

A power system and low-frequency oscillation technology, applied in information technology support systems, electrical components, circuit devices, etc., can solve problems such as difficult to identify low-frequency oscillation characteristic information of power systems

Inactive Publication Date: 2015-11-25
SHENZHEN UNIV
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Problems solved by technology

However, the analysis found that if the Prony method is directly used to process noise-like signals, it is difficult to identify and obtain accurate characteristic information of low-frequency oscillations in power systems

Method used

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  • A noise-like identification method for low-frequency oscillation characteristics of power systems
  • A noise-like identification method for low-frequency oscillation characteristics of power systems
  • A noise-like identification method for low-frequency oscillation characteristics of power systems

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Embodiment Construction

[0046] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0047] The method of the invention comprehensively uses the stochastic decrement technique and the Prony method, and realizes the low-frequency oscillation characteristic identification of the power system based on the wide-area measurement noise-like signal.

[0048]The study found that directly using the Prony method to process noise-like signals cannot accurately estimate the system oscillation mode parameters, and this method is not suitable for direct identification of noise-like signals with low-frequency oscillation characteristics of power grids. The reason is that the noise-like signal is caused by continuous small fluctuations in the power system, and there is a close relationship between this random response signal and the system input signal; while the Prony method believes that the value of the analyzed signal at the c...

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Abstract

The invention discloses a low-frequency oscillation character noise-like identification method in an electric power system. The method comprises the following steps: a), injecting a small random disturbance timing signal into a load of an emulation electric power system and collecting a small wave response timing signal of the emulation electric power system; b), inputting the small wave response timing signal into a noise-like signal processing module which is based on the random decrement technology to extract a system free decay response signal; and c), inputting the system free decay response signal into a low-frequency oscillation character analyzing module which is based on the Prony method to identify the low-frequency oscillation character parameter of the electric power system. The low-frequency oscillation character noise-like identification method in the electric power system can be processed at any time during the normal operation process of the electric power system (the power grid), can reflect the current dynamic characters of the electric power system timely and precisely, lays a good foundation for more adaptable system analysis and controller designing, and has a high application value in a practical electric power system.

Description

technical field [0001] This application relates to a method for identifying low-frequency oscillation characteristics of power systems based on wide-area measurement noise-like signals, and belongs to the technical field of power system stability analysis. Background technique [0002] With the continuous expansion of the scale of the power system and the extensive use of interconnection and fast excitation systems for large-scale units, the problem of low-frequency oscillation has become increasingly prominent, which seriously threatens the safe and stable operation of the interconnected power grid. Timely and accurate grasp of low-frequency oscillation characteristic information has become an important basis for effectively suppressing low-frequency oscillation phenomena in power systems. [0003] The emergence of wide-area measurement systems provides favorable conditions for the monitoring, analysis and control of large-scale interconnected power grids, and realizes the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50H02J3/00
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 吴超
Owner SHENZHEN UNIV
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