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Real-time Monitoring Algorithm for Low Frequency Oscillation in Power System

A low-frequency oscillation, real-time monitoring technology, applied in the field of monitoring to ensure normal and stable operation and solve real-time monitoring problems

Inactive Publication Date: 2011-11-30
SHANGHAI RUNIWILL AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no algorithm that can solve the problem of real-time monitoring of low-frequency oscillations in power systems.

Method used

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  • Real-time Monitoring Algorithm for Low Frequency Oscillation in Power System
  • Real-time Monitoring Algorithm for Low Frequency Oscillation in Power System

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Embodiment Construction

[0023] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and all similar methods and similar changes of the present invention should be included in the protection scope of the present invention.

[0024] An embodiment of the present invention provides a real-time monitoring algorithm for low-frequency oscillations in a power system according to the present invention, which includes two parts: capturing the starting point of low-frequency oscillations and identifying logic for low-frequency oscillations. The algorithm for capturing the starting point of low-frequency oscillations is based on the characteristics of low-frequency oscillations to describe that low-frequency oscillations have an oscillation period smaller than Tz (default is 20s) and amplitude greater than Pz (default is 50MW), and a mutation trigger scheme can b...

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Abstract

The invention discloses a real-time monitoring algorithm for low-frequency oscillation of a power system, which relates to the technical field of monitoring; what is to be solved is the technical problem of being able to realize real-time on-line monitoring of the low-frequency oscillation of the system; the flow of the algorithm is as follows: 1) The low-frequency oscillation start criterion, When there is new data, the low-frequency oscillation start criterion works once every time a new data is received; 2) Initialize the initial value of Pe and process the initial value of P in the buffer; 3) Determine whether there is a start flag? If there is, go to 4); if not, wait for new data; 4) Preprocess the data: process all extreme points; 5) Discriminate the first low-frequency oscillation: clear the oscillation counter, oscillation mark, and oscillation cycle time interval accumulator; 6) Subsequent LFO discrimination. The invention has the characteristics of being able to realize the real-time on-line monitoring of the low-frequency oscillation of the system so as to ensure the normal and stable operation of the system.

Description

technical field [0001] The invention relates to a monitoring technology, in particular to a technology of a real-time monitoring algorithm for low-frequency oscillation of a power system in the field of automatic control. Background technique [0002] In the early stage of power system development, the structure of the system is relatively simple and loose, and its static stability problem usually manifests as aperiodic out-of-synchronization between the generator and the system. With the continuous expansion of the power system, the interconnection of large-scale power systems has appeared, the system connection has become more and more close, and the entire power system has become more and more complex. Therefore, the static stability problem of the system is often manifested as the power dynamic oscillation between the generator sets, especially in the tie line of the interconnected system, the performance of this oscillation is more prominent. Because the frequency of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/24G01R31/08
Inventor 章良栋张卫红
Owner SHANGHAI RUNIWILL AUTOMATION TECH
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