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Power Harmonic Analysis Method

A technology of power harmonics and analysis methods, applied in the field of electrical automation, can solve problems such as long startup time and inability to use, and achieve the effects of improving accuracy, suppressing harmonic analysis errors, and high computing efficiency

Active Publication Date: 2019-07-05
WASION GROUP HLDG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This algorithm can only be used on SAR ADCs. High-resolution, highly integrated and low-cost Σ-Δ ADCs have too long start-up time to use this technology. Analog sampling in high-precision energy metering systems usually requires Σ-Δ ADCs. -Δ ADC

Method used

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Embodiment Construction

[0034] like figure 1 Shown is the basic principle block diagram of the present invention: the present invention is mainly based on Lagrange interpolation and FFT resampling technology. First, use Σ-Δ ADC to collect voltage and current, obtain discrete voltage sampling value and current sampling value sequence, and calculate the cycle value of voltage; then interpolate and resample voltage and current according to the cycle of voltage; then use FFT algorithm to interpolate Harmonic analysis is performed on the final voltage and current data sequence; finally, harmonic measurement indicators such as harmonic voltage, harmonic current, and total harmonic active power are calculated according to the FFT analysis results.

[0035] like figure 2 Shown is the method flowchart of the present invention: this power harmonic analysis method provided by the present invention comprises the following steps:

[0036] S1. Obtain the actual number of periodic sampling points of the input vo...

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Abstract

The invention discloses a power harmonic analysis method. The method comprises a step of obtaining an input voltage actual sampling point number, a step of calculating a translation amount needed by each sampling point, a step of calculating a total translation amount needed by an interpolation point, a step of taking the integral part of the total translation amount as an offset to obtain a corresponding actual sampling point value, carrying out secondary interpolation according to obtained three sampling values and the decimal part of the total translation amount to obtain interpolation data corresponding to the interpolation point, a step of repeating the above steps until a processed point number reaches a total point number, and thus obtaining a new interpolation sequence, and a step of carrying out analysis by using stored interpolation sequences of voltage and current and calculating power harmonic parameters. According to the method, a harmonic analysis error caused by the spectral leakage of an FFT in non-synchronous sampling is effectively restrained, a complex phase-locked loop circuit in hardware synchronous sampling is omitted, the fine tuning of an ADC sampling interval is not needed, and thus the application scope is wide, the attenuation of each subharmonic amplitude by interpolation is reduced effectively, and the harmonic analysis accuracy and operation efficiency are greatly improved.

Description

technical field [0001] The invention belongs to the field of electric automation, and in particular relates to an electric power harmonic analysis method. Background technique [0002] With the rapid development of power electronics technology, such as photovoltaic power, wind power, electric arc furnace, electrified railway and rolling mill and other loads are widely used, the proportion of non-linear loads in the power grid is gradually increasing. At present, the problem of harmonic pollution caused by nonlinear loads in the power grid is becoming more and more prominent, and the power management department is paying more and more attention to the measurement accuracy of harmonic meters. In 2014, the country released and implemented the harmonic meter standard "GB / T17215.302-2013 Static Harmonic Active Energy Meter", which standardized and unified the harmonic meter so that it can be used more effectively and reasonably in the power grid. effect. [0003] At present, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 汪龙峰周杰文任智仁
Owner WASION GROUP HLDG
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