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Amplitude detection method and system for sinusoidal signal

A sinusoidal signal, amplitude detection technology, applied in the field of electric power, can solve the problems of low measurement accuracy, poor resistance to harmonics and noise interference, etc.

Active Publication Date: 2018-05-25
深圳市科润宝实业有限公司
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Problems solved by technology

However, the above-mentioned method has low measurement accuracy for low-frequency signals (for example, the rated power frequency of power grid operation is around 50Hz), and has poor anti-harmonic and noise interference

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  • Amplitude detection method and system for sinusoidal signal
  • Amplitude detection method and system for sinusoidal signal
  • Amplitude detection method and system for sinusoidal signal

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Embodiment Construction

[0056] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0057] Although the steps in the present invention are arranged with labels, they are not used to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted.

[0058] In some embodiments, such as figure 1 As shown, the amplitude detection method of a sine signal includes the following steps:

[0059] S101 obtains the preliminary sampling sequence length according to the lower limit of the frequency range of the sinusoidal signal, the preset sampling frequency and the preset number of signal cycles;

[0060] S102 Preliminarily sampling the sinusoidal signal according to the length of the preliminary sampling sequence to obtain a preliminary sam...

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Abstract

The invention relates to an amplitude detection method and an amplitude detection system for a sine signal. The method comprises the following steps: truncating a sampled signal sequence to obtain a truncated signal sequence; respectively multiplying the cosine function of a measured reference frequency and the sine function of the reference frequency by the signal sequence and the truncated signal sequence to generate two sets of real-frequency vector sequences and virtual-frequency vector sequences; digitally trapping the two sets of real-frequency vector sequences and virtual-frequency vector sequences to generate two sets of imaginary vector trap sequences and real vector trap sequences, and generating two sets of imaginary vector integral values and real vector integral values through integration; converting the two sets of imaginary vector integral values and real vector integral values into a sequence amplitude and two phases, and extending the two phases to obtain extended phases; converting the two extended phases into a frequency difference; and converting the sequence amplitude and the frequency difference into the fundamental amplitude of the sine signal. By implementing the method and the system of the invention, fundamental amplitude of high accuracy can be obtained.

Description

Technical field [0001] The present invention relates to the field of electric power technology, in particular to a method and system for detecting the amplitude of a sinusoidal signal. Background technique [0002] The frequency measurement, phase measurement, and amplitude measurement of the power system are essentially the measurement of sinusoidal signal parameters. Fourier transform is a basic method for realizing parameter measurement of sinusoidal signals, and it is widely used in power systems. However, with the development of sine parameter measurement technology, the problems of Fourier transform have become more prominent, and it is difficult to further meet the requirements of the power system for high accuracy calculation of sine parameters. [0003] In the power system sinusoidal signal parameter measurement, there are some improved parameter measurement methods, such as zero-crossing method, filter-based measurement method, wavelet transform method, neural network-ba...

Claims

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Application Information

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IPC IPC(8): G01R19/00H03H17/02
Inventor 徐庆伟李鑫亮
Owner 深圳市科润宝实业有限公司
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