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A Hierarchical Detection Method for Low-Frequency Oscillating Modes of Power System Noise-Like Signals

A low-frequency oscillation, power system technology, applied in information technology support systems, electrical components, circuit devices, etc., can solve problems such as large amount of PMU data calculation and speed impact.

Inactive Publication Date: 2018-07-27
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the centralized analysis of all PMU data in the control center requires a large amount of calculation, and the speed is affected

Method used

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  • A Hierarchical Detection Method for Low-Frequency Oscillating Modes of Power System Noise-Like Signals
  • A Hierarchical Detection Method for Low-Frequency Oscillating Modes of Power System Noise-Like Signals
  • A Hierarchical Detection Method for Low-Frequency Oscillating Modes of Power System Noise-Like Signals

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Experimental program
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Embodiment

[0052] Below is the step that adopts the specific embodiment of the present invention, as follows:

[0053] The small disturbance state change process of the whole system can be expressed by a linear time-invariant differential equation:

[0054]

[0055] Among them, x(t) is an n-dimensional state vector, and y(t) is an m-dimensional output vector. u(t) is a k-dimensional input vector. In general steady-state power system low-frequency oscillation detection, it can be considered that small changes such as load fluctuations are the main input disturbances, and u(t) is generally set as zero-mean white noise.

[0056] where the i-th eigenvalue of matrix A is

[0057] lambda i = σ i +jω i

[0058] The corresponding oscillation frequency and damping ratio are respectively

[0059] f i = ω i / (2π)

[0060]

[0061] with lambda i The corresponding modal quantity is its corresponding right eigenvector φ i . φ i The ratio of the l-th and k-th elements is defined as ...

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Abstract

The present invention improves a conventional low-frequency oscillation centralized operational mode into a distributed operational mode, and discloses a low-frequency oscillation mode layered detection method for a power system noise signal, i.e. a low-frequency oscillation monitoring function is deployed on a substation layer and a dispatching center layer. On the substation layer, PMU data of a substation is utilized to carry out local low-frequency oscillation detection and frequency spectrum estimation, and on the dispatching center layer, synthetic estimation is carried out according to low-frequency oscillation result data sent by the substation layer. In order to achieve synthesis of low-frequency oscillation detection results of the substation layer on the dispatching center layer, firstly, all the PMU data of all systems are identified, then a least squares support vector machine (LSSVM) is adopted to carry out fitting with the low-frequency oscillation detection result of the substation layer, and finally, all the systems can be subjected to rapid synthetic judgment only according to the low-frequency oscillation results uploaded by the substation so as to determine an interval oscillation mode and a local oscillation mode of the whole system.

Description

technical field [0001] A new hierarchical detection method for detecting low-frequency oscillation modes is proposed to overcome the need to collect all PMU data in a centralized manner before performing low-frequency oscillation detection in previous methods, reduce communication traffic, and increase computing speed. Background technique [0002] After the large-scale and long-distance interconnection of the power grid, low-frequency oscillation is easy to occur in the system. Although the electromagnetic damping torque provided by the generator rotor winding in the general grid structure system is very large, the weak interconnection between the regional large power grids may greatly reduce the electromagnetic damping between generators in different regions, thereby causing low-frequency oscillations; in addition , as the scale of the system continues to increase, the structure becomes more and more complex, and the operation is getting closer to the critical point, the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J13/00G06Q50/06
CPCG06Q50/06H02J13/0006Y02E60/00Y04S10/16
Inventor 刘栋王东方张海宁李春来杨立滨龚庆武梁志远董可乐关钦月
Owner STATE GRID CORP OF CHINA
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