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Generator set disturbance source positioning method based on FFT algorithm

A technology for generator sets and power plants, which is used in motor generator testing, measurement of electricity, measurement of electrical variables, etc., can solve the problems of inability to locate disturbance sources, cannot consider disturbance source location, etc., to achieve the effect of convenient calculation and less collection

Active Publication Date: 2020-03-13
STATE GRID HUNAN ELECTRIC POWER +2
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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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  • Generator set disturbance source positioning method based on FFT algorithm
  • Generator set disturbance source positioning method based on FFT algorithm
  • Generator set disturbance source positioning method based on FFT algorithm

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Embodiment Construction

[0039] The following is a detailed description of the embodiments of the present invention. This embodiment is carried out based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes to further explain the technical solution of the present invention.

[0040] The method for locating the generator set disturbance source 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 synchronized phasor measurement unit PMU at each generator set end of 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, when the wide-area measurement system WAMS sends out the warning information of low-frequency oscillation of the power system, the electrical quanti...

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Abstract

The invention discloses a generator set disturbance source positioning method based on an FFT algorithm. The method comprises the following steps: calling the electrical quantity recording of each generator set in a power plant in the whole process of low-frequency oscillation when low-frequency oscillation happens to a power system; for each generator set, selecting the active power and frequencyof the generator set in the steady-state oscillation stage from the electric quantity recording, processing the active power and frequency by using FFT, and extracting 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, calculating the oscillation energy of the dominant oscillation mode component and extracting aperiodic components, and superposing the aperiodic components of the oscillation energy of the N dominant modes of the generator set to obtain the total aperiodic energy of the generator set; and for each generator set in the power plant, judging whether the generator set is a disturbance source or not according to the curve slope of the total aperiodic energy of the generator set. According to the invention, a disturbance source under the condition of coexistence of a plurality of dominant oscillation modes can be accurately positioned.

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 grid structure and operation mode has greatly increased, and the problem of low-frequency oscillation in the power system has become increasingly prominent. In recent years, in addition to the low-frequency oscillations between system regions caused by the traditional weak damping mechanism, forced power oscillations caused by abnormal prime movers and speed control systems have also occurred many times in the power grid. [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 natural oscillation f...

Claims

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Application Information

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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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