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A method for detecting sub-supersynchronous harmonics in power systems based on vector matching

A power system and harmonic detection technology, which is applied in the field of sub-supersynchronous harmonic detection in power systems based on vector matching, can solve problems such as frequency and amplitude fluctuations that cannot truly reflect the time changes of sub-supersynchronous signals

Active Publication Date: 2019-10-22
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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Problems solved by technology

The sub-supersynchronous signal obtained by filtering the signal is a reflection in a frequency band, and cannot truly reflect the frequency and amplitude fluctuations of the sub-supersynchronous signal over time

Method used

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  • A method for detecting sub-supersynchronous harmonics in power systems based on vector matching
  • A method for detecting sub-supersynchronous harmonics in power systems based on vector matching
  • A method for detecting sub-supersynchronous harmonics in power systems based on vector matching

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Embodiment Construction

[0035] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0036] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0037] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] Such as figure 1 As shown, a method for detecting sub-supersynchronous harmonics in a power system based on vector matching includes the following steps:

[0039] S1. Obtain the current sampling sequence x(n) from the wave recording device, and filter out the power frequency component to obtain the sequence y(n):

[0040] In this embodiment, samples are taken from the line current monitored by the PMU device of the wind power collection station. The order of the band-stop filter used is 6, the stop-band cut-off frequencies are 45 Hz and 55 Hz, the pass-ba...

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Abstract

The invention discloses an electric power system sub-hyper-synchronous harmonic wave detection method based on vector matching. The method comprises steps that a series y(n) is acquired by filtering out power frequency components from a current sequence x(n); vector matching fitting of spectrums in sub-synchronous and hyper-synchronous frequency band scopes of the sequence y(n) is carried out, incombination with the extremum, preliminary sub-hyper-synchronous harmonic waves are discriminated; clustering of the preliminary sub-hyper-synchronous harmonic waves in a preset time window is carriedout to identify real sub-hyper-synchronous harmonic waves. The method is advantaged in that the Fourier theory and the intelligent machine theory in the harmonic wave analysis category between electric power systems are fully utilized, and quasi-real-time monitoring of the sub-hyper-synchronous harmonic waves in the electric power under the complex time-varying operating environment is realized.After new energy grid connected, the advantages are more obvious under the coexistence background of a large number of power electronic control devices. The method is of great importance for timely finding and removing harmonic sources in the power grid affecting stability of the system.

Description

technical field [0001] The invention relates to the field of dynamic oscillation monitoring and analysis of power systems, and more specifically, to a method for detecting sub-supersynchronous harmonics in power systems based on vector matching. Background technique [0002] With the large-scale development and utilization of new energy sources such as wind power and photovoltaics, the power system dominated by conventional thermal power units is gradually transforming into a new energy power system. While enhancing the flexibility of the new energy power system, power electronics technology also brings new disturbances and hidden dangers to the system. Different from the concepts of synchronous and asynchronous in traditional power grids, after sub-supersynchronous harmonics are induced by power electronic devices in the system, they may still run on the grid and continue to threaten the machine network, seriously affecting the safe operation of the machine network. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 焦邵麟曾耿晖李一泉刘玮屠卿瑞张智锐
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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