Synchronous phasor measurement method based on self-adoption variable window

A synchronous phasor measurement and self-adaptive technology, applied in measurement devices, measurement of electrical variables, frequency measurement devices, etc., can solve problems such as spectrum leakage and phasor measurement accuracy decline

Inactive Publication Date: 2012-09-19
NAVAL UNIV OF ENG PLA
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Problems solved by technology

But when the frequency offset is large, the accuracy of phasor measuremen...

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  • Synchronous phasor measurement method based on self-adoption variable window

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Embodiment Construction

[0077]The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0078] The self-adaptive sampling synchrophasor method adopted in the present invention is used for the synchrophasor measurement in the ship power system, and the measurement result is compensated for the difference, which greatly improves the accuracy of the synchrophasor measurement. The step phasor The method includes the following steps:

[0079] (1) Variable definition

[0080] φ: is the instantaneous phasor phase angle

[0081] X, x: instantaneous phasor magnitude

[0082] N: Number of sampling points per power frequency cycle

[0083] f s :Sampling frequency

[0084] (2) Estimation of the actual frequency f of the signal at the next sampling moment

[0085] Order T s =Δt, then:

[0086] f = ΔΦ 2 πΔt ...

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Abstract

The invention provides a synchronous phasor measurement method based on a self-adoption variable window, which is used for the field of a synchronous phase measurement of a power system. When being variable, a signal frequency is measured in real time, and the signal frequency in the next sampling time is estimated. The method used by the invention is used for keeping a sampling frequency unchanged rather than adjusting the sampling frequency fs. A data length N belonging to current calculation can be automatically adjusted according to an estimation frequency, so as to keep N*Ts=T (Ts=1/fs is a fixed sampling period, fs is the sampling frequency, T=1/f is an actual signal period value, and f is a signal frequency). Thus, the error compensation precision is improved; the frequency estimation precision is greatly improved. The synchronous phasor measurement method provided by the invention is applicable to synchronous phasor measurement calculation and frequency calculation correction in a ship power system.

Description

technical field [0001] The invention relates to the field of synchronized phasor measurement, in particular to a synchronized phasor measurement method based on an adaptive variable window for a ship power system. Background technique [0002] Most of the existing phasor measurement algorithms are based on discrete Fourier transform (DFT). When the frequency deviation in the power grid is not large, DFT can give satisfactory results no matter the measurement of amplitude and phase. But when the frequency offset is large, the accuracy of phasor measurement will drop rapidly due to the spectrum leakage caused by asynchronous sampling. Contents of the invention [0003] The invention provides a synchronized phasor measurement method based on an adaptive variable window. Aiming at some shortcomings of the current phasor measurement algorithm, an improvement is made on this basis to improve the accuracy of error compensation and greatly improve the accuracy of frequency estimat...

Claims

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Application Information

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IPC IPC(8): G01R25/00G01R23/02
Inventor 夏立王黎明卜乐平邵英王征
Owner NAVAL UNIV OF ENG PLA
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