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Electrical phasor measuring method and device adapting to frequency conversion process

A phasor measurement and electrical quantity technology, applied in the field of current and voltage phasor measurement, can solve problems such as inability to measure measurement errors, and achieve the effect of simple and convenient implementation and solving inaccurate calculation.

Active Publication Date: 2016-01-27
NR ELECTRIC CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for measuring electrical quantity phasors that adapts to the frequency conversion process, and solve the problem that the previous methods cannot measure or have large measurement errors under the condition of rapid frequency changes

Method used

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  • Electrical phasor measuring method and device adapting to frequency conversion process

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Embodiment Construction

[0038] The overall flow chart of this method is as follows figure 1 shown. The protection device uses a fixed sampling frequency to collect the voltage and current of the secondary side of the voltage transformer and / or the current transformer, and uses the frequency measurement algorithm to detect the voltage and current signal frequency f e . Determine the data window length N according to the sampling frequency and the current voltage and current frequency, and calculate the new N data values ​​through the interpolation method in the current data window, and the time interval between adjacent data points in the new N data values ​​is A phasor calculation is performed on the N data values ​​using a phasor algorithm to obtain a phasor of voltage and current.

[0039] Taking the Fourier algorithm as an example, the present invention will be further described in conjunction with the accompanying drawings:

[0040] (1) The device collects the voltage and current of the secon...

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Abstract

The invention discloses an electrical phasor measuring method and device adapting to a frequency conversion process. The method comprises the steps: (1) a protective apparatus acquires secondary side voltages and currents of a voltage transformer and / or a current transformer by means of a fixed sampling frequency, and detects the voltage and current signal frequency fe through a frequency measurement algorithm; (2) the length N of a data window is determined according to the sampling frequency and the current voltage and current frequency, and new N data values are obtained in the current data window through an interpolation method, wherein the time interval of every two adjacent data points in the new N data values is shown in the description; and (3) phasor calculation is conducted on the N data values through a phasor algorithm, and then the phasors of voltages and currents are obtained. The invention also provides a device utilizing the above method. The electrical phasor measuring method and device help to solve the problem of great phasor calculation errors when the electrical signal frequency significantly deviates from a rated frequency value.

Description

technical field [0001] The invention relates to the measurement of electrical quantities in a power system, in particular to a method and a device for measuring current and voltage phasors in the process of frequency conversion of electrical equipment. Background technique [0002] The measurement of the current and voltage phasors of the power system is the first problem to be solved in the protection and control system, and the calculation accuracy of it will directly affect the performance of the protection and control components. At present, the main methods of phasor measurement calculation are: [0003] (1) Fourier algorithm with fixed data window. The protection control system uses a fixed sampling frequency to obtain discrete signals of current and voltage; take a fixed data window, for example, corresponding to a power frequency cycle, the data window takes 24 points; and then uses the Fourier algorithm to calculate the real part of the current and voltage and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
Inventor 沈全荣王凯王光陈俊严伟
Owner NR ELECTRIC CO LTD
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