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Dynamic phasor estimation method and system based on Kaiser window

A dynamic phasor and phasor technology, applied in complex mathematical operations, spectral analysis/Fourier analysis, etc., can solve problems such as large frequency spectrum, decreased measurement accuracy, fence effect, etc., and achieve the effect of high dynamic estimation accuracy

Pending Publication Date: 2021-03-02
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that when low-frequency oscillations occur at the same time in amplitude and phase, the measurement accuracy of the existing synchronized phasor measurement method drops sharply, and it is difficult to meet the requirements of synchronized phasor measurement. The purpose is to provide a dynamic The phasor estimation method and system solve the problem that the traditional discrete Fourier transform may produce large spectrum leakage and fence effect when the power oscillation occurs in the power system, which leads to the problem that the measurement value error of the phasor estimation is too large

Method used

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  • Dynamic phasor estimation method and system based on Kaiser window
  • Dynamic phasor estimation method and system based on Kaiser window
  • Dynamic phasor estimation method and system based on Kaiser window

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Embodiment 1

[0066] A dynamic phasor estimation method based on Kaiser window, such as figure 1 shown, including the following steps:

[0067] Step 1: According to the dynamic characteristics of the signal after the power system power oscillation occurs, the Taylor series is used to perform polynomial decomposition on it, and the fundamental frequency phasor model X(t) of the power oscillation signal is obtained, and then the discretization is obtained by further derivation through the Euler formula signal model x(k);

[0068] Step 2: Based on fixed sampling technology, use a digital-to-analog converter to f s The voltage / current signal in the power grid is discretely sampled for the sampling frequency, and the discrete sequence x(k) of the voltage / current signal of the power grid is obtained; then, the time at the center of the data window is taken as the reference time t ref , using a set of Kaiser windows K with different Bessel parameters β aiser (k, β) perform short-time Fourier tr...

Embodiment 2

[0111] Embodiment 2 is based on Embodiment 1, a dynamic phasor estimation system based on Kaiser window, including:

[0112] Processing module: used to establish a phasor estimation model of the power oscillation signal; adjust the Kaiser window Bessel parameter β in the phasor estimation model to obtain the amplitude-frequency response of the oscillation signal under different sidelobe attenuation; establish a multi-Kaiser window-based The Taylor derivative estimation equations are used to improve the phasor estimation accuracy under power oscillation; the least squares estimation method is used to solve the Taylor derivatives to be found in the equations to obtain the fundamental component of the power oscillation fundamental frequency signal;

[0113] Deviation correction module: it is used to correct the deviation between the reference time and the report time of the satellite timing service system by phase shift operation, and output the final accurate result of phasor est...

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Abstract

The invention discloses a dynamic phasor estimation method and system based on Kaiser windows. The method comprises the following steps: firstly, building a phasor estimation model of a power oscillation signal, obtaining the amplitude-frequency response of the oscillation signal under different side lobe attenuation conditions through adjusting a Bessel parameter beta of the Kaiser windows, and building a Taylor derivative estimation equation set based on a plurality of Kaiser windows in order to improve phasor estimation precision under power oscillation; and secondly, solving a Taylor derivative to be solved in an equation set by using a least square estimation method to obtain a fundamental component of the electric power oscillation fundamental frequency signal. In practical application, phase shift operation is adopted to correct deviation between reference time and report time of a satellite time service system, and a final accurate result of phasor estimation is output. Accurate phasor measurement under the power oscillation condition is achieved, and the test results of standard dynamic modulation and RTDS signal generation show that when power oscillation happens to a power system, the method has high dynamic estimation precision and meets various indexes of the measurement standard.

Description

technical field [0001] The invention relates to the field of synchronized phasor measurement in electric power systems, in particular to a dynamic phasor estimation method and system based on a Kaiser window. Background technique [0002] With the continuous expansion of the scale of the power system, the equipment in the power grid monitoring system, such as the monitoring and data acquisition system and the wide-area measurement system, all play an important role in the real-time data acquisition and status monitoring of the power system. Since the wide-area measurement system and the phasor measurement unit have high transmission rate and high phase angle estimation accuracy, they have made great contributions to the safe operation of the power grid, so they have received extensive attention. [0003] However, as more and more distributed power sources are connected to the grid, power oscillation has gradually become the cause of abnormal swing of the rotor angle of the m...

Claims

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Application Information

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IPC IPC(8): G01R23/16G06F17/14
CPCG01R23/16G06F17/14Y02E60/00
Inventor 李小鹏滕予非冯世林孙永超
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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