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Grid synchronization harmonic phasor measurement method based on binary search

A harmonic phasor and measurement method technology, applied in the field of synchronous harmonic phasor measurement, can solve the problems of inaccurate harmonic phasor measurement, difficulty in dividing harmonic responsibilities, inaccurate harmonic source positioning, etc. Wave suppression and management, rapid convergence, rapid convergence effect

Active Publication Date: 2014-05-21
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

DFT algorithm can detect harmonics under certain conditions and range, but there are certain limitations, and the accuracy of harmonic measurement directly affects harmonic positioning
Inaccurate harmonic phasor measurement will eventually lead to inaccurate positioning of harmonic sources, and it is difficult to divide harmonic responsibilities, which will bring great difficulties to harmonic control

Method used

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  • Grid synchronization harmonic phasor measurement method based on binary search

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Embodiment

[0033] A method for measuring grid synchronous harmonic phasors based on binary search, the steps of which are:

[0034] A. Data collection and preprocessing

[0035] In a measurement cycle (passing 5-30 seconds), the sampler collects the voltage signal or current signal of the grid from the voltage or current transformer installed on the grid, and the numerical signal processor collects the voltage signal or current of the grid The signal is used as the input signal, and the input signal is subjected to discrete Fourier transform to obtain the frequency spectrum of the input signal, and the frequency domain signal of the input signal is obtained by performing least squares fitting on the frequency spectrum;

[0036] B. The numerical signal processor calculates t respectively according to the frequency domain signal of the input signal obtained in step A 1 The phase of the input signal at time and t 2 The phase angle of the input signal at time and using the formula Co...

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Abstract

The invention discloses a grid synchronization harmonic phasor measurement method based on binary search. The method includes the steps: firstly, acquiring and preprocessing signals; secondly, performing search iterative operation for real frequency of harmonic by the aid of a bisection method, ensuring the correct iterative process by comparing and updating harmonic phasor values, performing repeated iterative calculation by taking preset error ratio accuracy as a standard, and approximating the real frequency of the harmonic; and finally, calculating a more accurate harmonic phasor estimation value in an iterative manner. Therefore, the accurate harmonic phasor estimation value is obtained by the aid of traditional Fourier transforming and transferring function amplitude frequency response characteristics. The method can approximate the real frequency and the phasor amplitude of the harmonic and is applied to grid harmonic measurement, positioning accuracy of a harmonic source can be improved, more accurate information is provided for suppressing grid harmonic, and harmonic suppression and management are facilitated.

Description

technical field [0001] The invention relates to a method for measuring synchronous harmonic phasors in the electric power industry. Background technique [0002] In recent years, with the continuous development of industrial technology, the problem of harmonic pollution in power systems has become increasingly serious. Due to the widespread use of nonlinear loads such as electric arc furnaces, a large number of power electronic devices, and electric locomotives, a large number of high-order harmonics are generated, causing voltage and current distortion of the power system, seriously endangering the safe and stable operation of the power system, and affecting the user's safety. Power quality. Therefore, it is very urgent to solve the harmonic problem, and harmonic detection and harmonic positioning are the key prerequisites for harmonic control. [0003] At present, the Discrete Fourier Transform (DFT) algorithm has good application value under static conditions and has be...

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Application Information

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IPC IPC(8): G01R23/16
Inventor 何正友冯玎符玲麦瑞坤
Owner SOUTHWEST JIAOTONG UNIV
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