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Window length variable quasi-synchronization grid-connecting parameter measuring method

A parameter measurement and quasi-synchronous technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of large spectrum leakage and reduced calculation amount

Active Publication Date: 2019-03-22
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0005] The purpose of the present invention is to provide a quasi-synchronous grid-connected parameter measurement method with variable window length, which can solve the problem that the spectrum leakage is still relatively large when the existing algorithm deviates from the full-cycle sampling, and the entire calculation amount is greatly reduced

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  • Window length variable quasi-synchronization grid-connecting parameter measuring method
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  • Window length variable quasi-synchronization grid-connecting parameter measuring method

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[0073] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0074] like figure 1 As shown, a quasi-synchronous grid-connected parameter measurement method with variable window length includes the following steps:

[0075] Step A: According to the fluctuation range of the frequency, determine the range of sampling points for L periods, and generate the convolution window corresponding to N points offline for each even number N in the range, and then generate the sine and cosine factors offline Then multiply the convolution window corresponding to N points and the sine...

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Abstract

The invention provides a window length variable quasi-synchronization grid-connecting parameter measuring method. The window length variable quasi-synchronization grid-connecting parameter measuring method inhibits spectrum leakage through a Hanning convolution window, measures fundamental frequency of voltage signals on both sides of a grid-connecting point through a window length variable phasedifference method, adjusts the length of the Hanning convolution window according to the measured fundamental frequency to reduce time errors of full-period sampling, accelerates timeliness of algorithms by offline generating convolution windows of different lengths and calculating the product of the convolution windows and sine and cosine factors and establishing a weighing coefficient table, deduces a convenient and rapid Hanning convolution window amplitude correcting formula, and is easy to implement and low in calculation volume.

Description

technical field [0001] The invention relates to the field of grid-connected parameter measurement, in particular to a quasi-synchronous grid-connected parameter measurement method with variable window length. Background technique [0002] During the operation of the power grid, it is often necessary to parallel the generator or micro-grid with the large power grid. This operation of merging the small system into the large system through switchgear such as circuit breakers is called synchronous operation. The so-called synchronization means that the voltages, frequencies, and phases on both sides of the switchgear are equal. The function of the synchronization device is to judge whether the two sides of the circuit breaker have reached the synchronization condition, so as to determine whether the closing and grid connection can be performed. The key lies in Fast and accurate measurement of the frequency, amplitude and phase of voltage signals on both sides of the grid. For t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00H02J3/40
CPCG01R31/00H02J3/40
Inventor 张鸿博蔡晓峰李雪王文星陆靖滨
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER