Synchronous phasor self-adaptation calculation method based on verification

An adaptive calculation and synchronized phasor technology, applied to the phase angle between voltage and current, measuring devices, measuring electrical variables, etc., can solve the problem of limited response speed of dynamic processes such as sudden changes, weak noise and harmonic suppression capabilities, Difficult to meet the accuracy requirements and other issues, to achieve the effect of taking into account the rapid response

Active Publication Date: 2016-11-23
CHINA SOUTHERN POWER GRID COMPANY +1
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Problems solved by technology

[0003] There is a correction algorithm based on DFT (Discrete Fourier Transform, discrete Fourier transform). Compared with the traditional DFT algorithm, the calculation accuracy is greatly improved, but the response speed to dynamic processes such as sudden changes is limited, and when the amplitude changes at any time Difficult to meet accuracy requirements
However, there is an alg

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  • Synchronous phasor self-adaptation calculation method based on verification
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  • Synchronous phasor self-adaptation calculation method based on verification

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[0028] The present invention will be described in detail below in conjunction with the accompanying drawings. The check-based synchrophasor self-adaptive calculation method proposed by the present invention can be implemented by using various hardware solutions, which will not be repeated here. The measuring algorithm flow process that the present invention proposes is as figure 1 As shown, the flow of the PMU algorithm is as follows figure 2 shown. The measurement method includes the following steps:

[0029] (1) Initialization, determine the number of sampling points N per cycle, the order K of the amplitude and phase angle in the power signal model of the steady-state and dynamic algorithms, and the interval between two data windows in the steady-state algorithm is l points.

[0030] (2) Signal modeling, the method uses complex signal P(t) to represent the dynamic phasor of power signal as P(t)=a(t)e j θ(t) , the power signal x(t) can be expressed as: In the formula...

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Abstract

The invention relates to a synchronous phasor self-adaptation calculation method based on verification. The synchronous phasor self-adaptation calculation method based on verification comprises the following steps that firstly, initialization is carried out, wherein the wave sampling number of each cycle, a signal model order and a time interval of two data windows in a steady state algorithm and a dynamic state algorithm are determined; secondly, a model for electric power signals in the steady state algorithm is established; thirdly, a synchronous phasor of the electric power signals is solved through a DFT result of the two data windows; fourthly, whether a calculation result is correct or not is verified by comparing a back-stepping value and a practically-measured value, the process is ended if verification succeeds, and the fifth step is carried out if the process fails; fifthly, the synchronous phasor is calculated with a dynamic algorithm; sixthly, verification is carried out again, a result of the dynamic algorithm serves as a finial result if verification succeeds, and the result of the steady algorithm serves as a final result if verification fails. Thus, the calculation modes are switched in a self-adaptation mode; according to the synchronous phasor self-adaptation calculation method based on verification, the calculation precision of a steady situation and the dynamic performance of a transient state situation are considered, and the requirements for accuracy and rapidity are considered. The synchronous phasor self-adaptation calculation method based on verification can be widely applied to synchronous phasor calculation of an electric system.

Description

technical field [0001] The invention relates to the technical field of automatic measurement of electric power systems, is a calibration-based synchrophasor self-adaptive calculation method, and particularly relates to a high-precision and fast-response synchrophasor measurement method. Background technique [0002] In recent years, the wide-area measurement system based on the phasor measurement unit (PMU) has been widely used in the fields of power system dynamic process monitoring, online identification, security and stability analysis, and wide-area control. With the continuous deepening of wide-area measurement system application research, PMU devices have higher and higher requirements for synchronized phasor measurement, and the accuracy and speed of its phasor algorithm will directly affect the reliability of related application functions. [0003] There is a correction algorithm based on DFT (Discrete Fourier Transform, discrete Fourier transform). Compared with the...

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Application Information

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IPC IPC(8): G01R25/00
CPCG01R25/00
Inventor 苏寅生唐卓尧李鹏徐全陆超韩英铎吴京涛
Owner CHINA SOUTHERN POWER GRID COMPANY
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