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A Software Synchronous Sampling Method for Power Harmonic Parameters

A technology of synchronous sampling and power harmonics, applied in the direction of spectrum analysis/Fourier analysis, etc., can solve the problems of complex calculation and unsatisfactory accuracy, achieve accuracy and real-time performance, reduce calculation, and accurately The effect of length of time

Active Publication Date: 2020-03-17
HARBIN INST OF TECH
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Problems solved by technology

Among them, the software synchronous sampling method is simpler than the hardware synchronous sampling method, but the calculation amount of the currently applied software synchronous sampling method is relatively complicated, or the accuracy cannot meet the requirements

Method used

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  • A Software Synchronous Sampling Method for Power Harmonic Parameters
  • A Software Synchronous Sampling Method for Power Harmonic Parameters
  • A Software Synchronous Sampling Method for Power Harmonic Parameters

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Embodiment Construction

[0037] The present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0038] Such as figure 1 As shown, it is a flow chart of a method for synchronous sampling of electric power harmonic parameters software in the present invention, and its specific process is as follows:

[0039] a1: Set the number of sampling points per cycle N;

[0040] In this step, the number of sampling points in one measurement period can be set as N, where N>2M is guaranteed (M is the highest harmonic order of the signal under test).

[0041] a2: Measure the time length Xi (i=1, 2...W) of the first W cycles and store it. This detection method can be performed through zero-crossing detection. The zero-crossing detection uses a comparator zero-crossing comparison circuit, which can be mor...

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Abstract

The invention discloses a novel synchronous sampling method for power harmonic parameter software. The method comprises the following steps: a1: setting the number N of sampling points per cycle, wherein N is the number of sampling points per cycle; a2: measuring and storing the time length Xi of the first W cycles, wherein i=1, 2...W; a3: calculating a smoothing coefficient alpha according to themeasured time length of the first W cycles, and storing the alpha value; a4: predicting the time length of next sampling period according to a cubic exponential smoothing model; a5: calculating a sampling time interval according to the formula Ts=T / N, performing next cycle of sampling, and storing the sampling value; a6: judging whether the number of sampled cycles has reached W, if so, enteringa7, otherwise, entering a8; a7: removing the data of the earliest cycle, adding the sampling value of the latest cycle, calculating harmonic parameters through a discrete Fourier transform method, andentering a8; and a8: removing the data of the earliest cycle, storing the time length of the latest cycle through zero-crossing detection, and returning to a3.

Description

technical field [0001] The invention relates to the field of electric energy quality parameter measurement, in particular to a control method for software synchronous sampling. Background technique [0002] Synchronous sampling refers to the signal period T, the sampling period interval T s , and the number of sampling points N strictly satisfies the equation T=NT s sampling method. Theoretically, as long as T=NT is satisfied s And N>2M (M is the highest harmonic order of the measured signal), there is no error in the measurement method for synchronous sampling, but because the measurement of the signal period T is not always accurate, and the frequency of the power grid signal is always within a certain range Therefore, in the actual sampling process, the sampling period and the period of the measured signal cannot be synchronized, resulting in spectrum leakage and fence effects. [0003] There are two methods of synchronous sampling: hardware synchronous sampling an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 佟为明金显吉李中伟林景波刘勇赵志衡陶耕宇
Owner HARBIN INST OF TECH
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