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Dynamic power analysis method based on frequency domain interpolation

A dynamic power and frequency domain interpolation technology, applied in electric power measurement through current/voltage, spectrum analysis/Fourier analysis, etc., can solve the problems of error and low accuracy of interpolation results, achieve small calculation amount and ensure accuracy , easy to achieve effect

Active Publication Date: 2019-06-28
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an improved dynamic power analysis method for frequency domain interpolation to solve the problems caused by asynchronous sampling or non-integer cycle truncation of data when the prior art uses windowed interpolation FFT algorithm to calculate frequency. Even if the interpolation algorithm is used, the influence of the negative frequency part is ignored, resulting in the problem that the accuracy of the interpolation result is not high

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  • Dynamic power analysis method based on frequency domain interpolation
  • Dynamic power analysis method based on frequency domain interpolation
  • Dynamic power analysis method based on frequency domain interpolation

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specific Embodiment

[0049] In this embodiment, the voltage and current transformers are used to introduce the electricity used by ordinary residents who are disturbed by the 5th harmonic. Here, the voltage and current transformers convert the voltage and current used by the residents into corresponding amplitude analog signals according to a certain ratio. To a voltage value suitable for A / D conversion. The 16-bit successive approximation A / D converter MAX1166 used in this patent has the advantages of small size, low power consumption, fast conversion speed and high precision. The characteristics of the serial interface make it directly connected with the CPU, which greatly simplifies the design of the input channel. After being converted into a digital signal by A / D, it is sent to a computer for analysis. The specific steps of the actual process are as follows:

[0050] The first step, with f s =3200 is the sampling frequency for discrete sampling of the voltage signal u(t) and current signal...

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Abstract

The invention discloses a dynamic power analysis method based on frequency domain interpolation. The method comprises the following steps: a, discretely sampling actual voltage signals and current signals to obtain a to-be-analyzed sine signal sequence X(n); b, performing fast Fourier transform on the to-be-analyzed sine signal sequence X(n), and calculating spectral interpolation coefficients delta<+> and delta<->; c, calculating weighted spectral interpolation coefficient shown in the description according to amplitudes of two spectral lines adjacent to peak spectral lines; d, calculating the frequency, amplitude and phase of the to-be-analyzed sine signal sequence X(n); e, obtaining the amplitude and phase angle of a voltage sequence to be recorded as Au and theta u respectively, and obtaining amplitude, phase angle and dynamic power of a current sequence. The method solves the problem of low interpolation result precision caused by the fact that when the frequency is calculated with a windowed interpolation FFT algorithm, errors caused by asynchronous sampling or non-integer period truncation of data exist and influence on part of the negative frequency is ignored even if the interpolation algorithm is adopted.

Description

technical field [0001] The invention belongs to dynamic power analysis, in particular to a dynamic power analysis method for improving frequency domain interpolation. Background technique [0002] The continuous development of my country's economy has led to strong domestic power demand, the construction of long-distance and large-scale transmission networks, and the extensive use of various nonlinear loads, and the power quality problem has become increasingly serious. The standard frequency of my country's power system is 50Hz, and the voltage and current are both standard sine waves of 50Hz. However, due to various interferences, in the actual power system, the voltage and current waveforms are always distorted to varying degrees. Effective detection of fundamental wave electric energy has become an issue that experts and scholars pay more and more attention to. [0003] At present, the most commonly used algorithm for frequency analysis of power system signals is Fast F...

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Application Information

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IPC IPC(8): G01R21/06G01R23/16
Inventor 张俊玮温和张秋雁欧家祥单铉昇张博古庭赟牛唯吴冕之安甦丁超孙航王扬王蓝苓胡厚鹏李航锋王泽贤熊德智
Owner GUIZHOU POWER GRID CO LTD
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