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United low-frequency oscillation online monitoring method of wide area measurement systems of multiple dispatching centers

A wide-area measurement system and low-frequency oscillation technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc.

Active Publication Date: 2012-09-19
国家电网华中电力调控分中心 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • United low-frequency oscillation online monitoring method of wide area measurement systems of multiple dispatching centers
  • United low-frequency oscillation online monitoring method of wide area measurement systems of multiple dispatching centers

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Embodiment Construction

[0028] 1) The present invention will be described in further detail below in conjunction with accompanying drawings and examples. In the actual power grid, according to the scope and level of the dispatching center involved in the joint low-frequency oscillation, the wide-area measurement system of the highest-level dispatching center is usually selected to realize the master station of the joint low-frequency oscillation monitoring, such as the national dispatching center (referred to as national dispatching center), when When the national dispatch is not involved, select an important large regional power grid dispatching center (referred to as network dispatching, such as the North China Dispatching Center). The sub-stations for joint low-frequency oscillation monitoring are usually provincial adjustment and network adjustment. In the following embodiments, three joint low-frequency oscillation monitoring sub-stations and one master station are taken as examples to illustrat...

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Abstract

The invention discloses a united low-frequency oscillation online monitoring method of wide area measurement systems of multiple dispatching centers, comprising the following steps of: selecting one from the wide area measurement systems of the multiple dispatching centers as a united oscillation monitoring main station, and taking the wide area measurement systems of other dispatching centers as sub-stations; when any sub-station or main station monitors low-frequency oscillation, triggering total network united low-frequency oscillation analysis; performing spectrum analysis on respective measurement points by each sub-station, and gathering analysis results to the main station to perform modal analysis such as coherency clustering of oscillation nodes of the total network and calculation of the relative contribution degree of each node to oscillation; returning the global results of analysis to each sub-station and performing visual display in the form of renderings. By the method, the wide area measurement system of each dispatching center can timely know detailed oscillation modal information of a low-frequency oscillation event influencing own grid, such as oscillation range, node clustering situation, interface position, degree of participation of own grid unit in oscillation, and the like.

Description

technical field [0001] The invention belongs to the technical field of power system security and stability analysis, and in particular relates to the content of joint low-frequency oscillation online monitoring performed by a wide-area measurement system of multiple dispatch centers. Background technique [0002] The low-frequency oscillation of the power system is a phenomenon in which the rotor of the generator continues to sway relative to each other after the power system is disturbed, resulting in periodic oscillations of active power in these units and the transmission lines connecting these units. The generators participating in the oscillation can be roughly divided into two coherent groups according to whether the absolute value of the relative phase of the rotor power angle is greater than 90° (the units in the coherent group have similar oscillation directions), and the units between the two groups The cut sets of transmission lines can constitute the interface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01R25/00
Inventor 刘涛段刚肖小刚吴京涛汤卫东杨东李晓红谢晓冬于宏文许君德王健詹庆才
Owner 国家电网华中电力调控分中心
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