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Method for monitoring low-frequency oscillating source based on PMU data

A low-frequency oscillation, real-time monitoring technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of little practical value, obtaining input signals, air disasters, etc. Effects of Component Parameter Accuracy Dependence

Active Publication Date: 2015-08-26
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In terms of locating the low-frequency oscillation source, there have been many documents and patents published, but the method of locating the oscillation source in these patents and documents is relatively difficult when obtaining the input signal, and has little practical value

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  • Method for monitoring low-frequency oscillating source based on PMU data
  • Method for monitoring low-frequency oscillating source based on PMU data
  • Method for monitoring low-frequency oscillating source based on PMU data

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Embodiment Construction

[0022] Below in conjunction with example and accompanying drawing, the present invention is described in further detail.

[0023] as attached figure 1 Shown is a schematic flow chart of the method for real-time monitoring of low-frequency oscillation sources based on PMU data in the present invention, and the described method for locating low-frequency oscillation sources in power systems includes the following steps:

[0024] 1) Obtain the attached data through the PMU device figure 2 The real-time discrete data on the outlet side of the power plant generator bus shown in , specifically include the active output power P, reactive output power Q, voltage phase angle θ, voltage amplitude U and generator power angle δ of the power plant outlet bus.

[0025] 2) Use the generator power angle δ for pre-analysis, and the criterion used is as follows:

[0026] max n = 1,2 , . ...

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Abstract

The invention provides a method for monitoring a low-frequency oscillating source based on PMU data, and relates to safety operation of an electric system. The method comprises: using a phasor measurement unit PMU to obtain information of a bus outlet side of a generator of an electric power system power plant, the information specifically including active output power, reactive output power, voltage phase angles, voltage amplitude values, and power angles of the power plant outlet bus, and according to the obtained data, calculating oscillation energy of the power plant bus, and using a TLS-ESPRIT algorithm to identify the obtained data, extracting a dominant oscillation mode of a power plant generator side, and obtaining corresponding oscillation characteristic parameters. If an oscillation source is in the power plant, oscillation energy flows out of the power plant, an oscillation energy flow is a positive value, and conversely, the oscillation energy flow is a negative value. The method is advantaged in that the PMU can be directly used to obtain input signals and monitor the low-frequency oscillating source of the electric power system in real time, and the method is convenient and fast, and is fast in computation speed, and is good in practicability.

Description

technical field [0001] The invention belongs to the field of real-time monitoring of low-frequency oscillation sources in power systems, and in particular relates to a method for real-time monitoring of low-frequency oscillation sources based on PMU data. Background technique [0002] Although grid interconnection has greatly improved the reliability and economy of power generation and transmission, and brought a series of economic benefits, it has also brought some new problems to the safe operation of the grid, such as interconnection lines within the large grid or with other grids. issues such as power flow control and stability control. The large-capacity, long-distance power transmission and heavy-load interconnected grid have a small damping coefficient. When the system is disturbed, it will cause power system oscillations, resulting in relative swings between generator rotors, which will cause low-frequency oscillations in the power system, threatening Safe and stabl...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 李阳海杨涛刘魏然黄树红高伟
Owner STATE GRID CORP OF CHINA
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