Synchronous phasor self-adaptation calculation method based on verification

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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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 algorithm based on the dynamic model in the frequency domain, which uses the responses of different frequency filters in the same data window to correct the estimation results of DFT, which improves the response speed to dynamic processes such as sudden changes, but this algorithm has weak noise and harmonic suppression capabilities. , and the problem of low accuracy in the fault process

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