Locating Method of Generating Unit Disturbance Source Based on FFT Algorithm

A technology for generator sets and power plants, which is applied in the direction of motor generator testing, electricity measurement, and electrical variable measurement. It can solve the problems of inability to locate the disturbance source and consider the location of the disturbance source, and achieve the effect of convenient calculation and less collection

Active Publication Date: 2021-11-19
STATE GRID HUNAN ELECTRIC POWER +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this method can only locate the disturbance source at the power plant level, but cannot locate the disturbance source to a specific generator set, let alone consider the disturbance source location under the coexistence of multiple dominant oscillation modes

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  • Locating Method of Generating Unit Disturbance Source Based on FFT Algorithm
  • Locating Method of Generating Unit Disturbance Source Based on FFT Algorithm
  • Locating Method of Generating Unit Disturbance Source Based on FFT Algorithm

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Embodiment Construction

[0039] The embodiments of the present invention are described in detail below. This embodiment is developed based on the technical solutions of the present invention, and provides detailed implementation modes and specific operation processes, and further explains the technical solutions of the present invention.

[0040] The method for locating the disturbance source of the generator set based on the FFT algorithm provided by the embodiment of the present invention specifically includes the following steps:

[0041] The first step is to install a synchrophasor measurement unit PMU at the end of each generator set in the power plant to continuously record the active power and frequency of the generator set. The data sampling frequency is 100Hz, that is, the interval between two data points is 10ms.

[0042] In the second step, after the wide-area measurement system WAMS sends out the alarm information of low-frequency oscillation of the power system, the synchrophasor measurem...

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Abstract

The invention discloses a generator set disturbance source location method based on FFT algorithm, which includes: when low-frequency oscillation occurs in the power system, the electric quantity recording wave of each generator set in the power plant during the whole process of low-frequency oscillation is called; Units: select their active power and frequency in the steady-state oscillation stage from the electrical quantity recording, and use FFT to process the active power and frequency respectively, and extract the N dominant oscillation mode components of the generator set in the steady-state oscillation stage ; For each dominant oscillation mode component of the generator set, calculate its oscillation energy and extract the aperiodic component; then superimpose the aperiodic components of the N dominant mode oscillation energies of the generator set to obtain the total aperiodic energy of the generator set; For each generator set in the power plant: judge whether it is a disturbance source according to the slope of the total non-periodic energy curve of the generator set. The invention can accurately locate the disturbance source under the coexistence of several dominant oscillation modes.

Description

technical field [0001] The invention belongs to the field of power system analysis, and in particular relates to a method for locating a disturbance source of forced power oscillation in a power system. Background technique [0002] With the large-scale grid connection of wind power and other new energy units and the commissioning of UHV DC transmission projects, the complexity of the power grid structure and operation mode has greatly increased, and the problem of low frequency oscillation of the power system has become more and more prominent. In recent years, in addition to the low-frequency oscillation between system regions caused by the traditional weak damping mechanism, forced power oscillations caused by the abnormality of the prime mover and the speed control system have also occurred in the power grid many times. [0003] Forced power oscillation is a low-frequency oscillation of a resonant power system. When the frequency of the disturbance source is close to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
CPCG01R31/343G01R31/346
Inventor 郭思源赵永生李理崔挺左剑张可人宋军英呙虎陈道君沈阳武王玎向萌
Owner STATE GRID HUNAN ELECTRIC POWER
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