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Synchronous phasor measuring method suitable for M-class PMU unit

A synchronous phasor measurement and phasor technology, which is applied in the measurement device, the measurement of electrical variables, the phase angle between voltage and current, etc., can solve the problems of DFT spectrum leakage and averaging effect, and achieves heavy computational burden. Effect

Active Publication Date: 2014-09-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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Problems solved by technology

However, there is currently no algorithm based on the dynamic phasor model, which cannot solve the problem of spectral leakage and averaging effects caused by DFT due to dynamic input signals

Method used

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  • Synchronous phasor measuring method suitable for M-class PMU unit
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  • Synchronous phasor measuring method suitable for M-class PMU unit

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Embodiment 1

[0025] figure 1 A flow chart of a synchronized phasor measurement method applicable to an M-type PMU unit provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the method mainly includes the following steps:

[0026] Step 11. Combining the low-pass digital filter for the phasor factor with the discrete Fourier algorithm DFT to calculate and obtain the initial measurement phasor after eliminating the spectrum leakage.

[0027] In the embodiment of the present invention, the low-pass digital filter for the phasor factor is obtained based on the dynamic phasor mathematical model of the second-order Taylor series; the dynamic phasor parameters include amplitude, phase angle, frequency and frequency change rate; the above parameters all change with time within the calculation time window.

[0028] Exemplarily, firstly, the dynamic fundamental frequency signal is expressed as:

[0029]

[0030] Among them, x(t) is the sampling value of the signal, X m...

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Abstract

The invention discloses a synchronous phasor measuring method suitable for an M-class PMU unit. The method includes the steps that a low-pass digital filter regarding a phasor factor is combined with disperse Fourier transform (DFT) algorithm, and an original phasor measured after spectrum leakage is eliminated is worked out; fitting is carried out on the dynamic phasor through second order Taylor series, the measurement error caused by the DFT equalization effect is obtained, compensation is carried out on the original phasor based on the error, and the precise dynamic phasor measurement is obtained; the low-pass digital filter regarding the M-class phasor measurement unit (PMU) is arranged at the phasor uploading position, the precisely measured phasor is used as input, and the final measured phasor is obtained. By means of the synchronous phasor measuring method, when the input is a static signal or a dynamic signal, phasor measurement can be carried out precisely and quickly, and the phasor accuracy can meet the requirements of IEEE C37.118.1, and is higher by an order of magnitude generally.

Description

technical field [0001] The invention relates to the technical field of synchronized phasor measurement, in particular to a synchronized phasor measurement method suitable for M-type PMU units. Background technique [0002] The application of phasor measurement unit (Phasor Measurement Unit, PMU) has brought a revolutionary change to the measurement technology of power system. In addition to providing synchronized phasors, its advantages of high precision and high-speed upload frequency have also become the reason why it is widely used as a phasor data source in dynamic security monitoring. IEEE C37.118.1 stipulates: M-type PMU is mainly used for synchronous measurement and analysis of power system signals. It does not need to have a fast response speed, but requires a wide frequency band for accurate phasor measurement and must have an elimination band function of the external frequency components. Therefore, whether the M-type PMU can obtain accurate measurement phasors i...

Claims

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Application Information

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IPC IPC(8): G01R25/00
Inventor 刘灏毕天姝
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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