Loop signal analysis method and device for DC control protection board

A DC control protection, board technology, applied in the field of signal processing, can solve problems such as the inability to effectively suppress the spectrum leakage of the analysis loop signal, and achieve the effects of avoiding mutual leakage interference, reducing spectrum leakage, and increasing the time domain range

Active Publication Date: 2017-05-31
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] The purpose of the present invention is to provide a loop signal analysis method and device for a DC control protection board, whi

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  • Loop signal analysis method and device for DC control protection board
  • Loop signal analysis method and device for DC control protection board
  • Loop signal analysis method and device for DC control protection board

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[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0030] Since the UHV DC transmission is the power supply end of the entire system, the output stability of the UHV DC transmission has a huge impact on the entire power supply system. Therefore, a control and protection board is installed for the DC control and protection platform. The control and protection board can provide a certain degree of protection for the DC control and protection platform, but the control and protection board may also fail. It is necessary ...

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Abstract

The invention discloses a loop signal analysis method and a device for a DC control protection board, which relate to the technical field of signal processing and aim at solving the problem that spectrum leakage generated during a loop signal analysis process can not be effectively restrained. The method mainly comprises steps: according to a preset sampling frequency, board loop signals are sampled uniformly, and discrete signals are acquired; the discrete signals are intercepted according to a mixed convolution window, and filter signals are acquired; the result of carrying out FFT (Fast Fourier Transformation) on the filter signals is determined to be a harmonic spectrum; in the harmonic spectrum with the distance with a preset basic frequency point to be smaller than preset frequency offset, a peak frequency point nearest to the preset basic frequency point and with the maximum amplitude is searched; according to the amplitudes corresponding to the preset basic frequency point and the peak frequency point, the amplitude offset is calculated; and according to the offset, every-order harmonic parameters in the harmonic spectrum are calculated, wherein the harmonic parameters comprise the amplitude, the phase and the frequency. The method and the device are mainly applied to loop signal analysis for the DC control protection board.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a loop signal analysis method and device for a DC control and protection board. Background technique [0002] UHV DC transmission refers to DC transmission with a voltage level of ±800kV and above. UHV DC transmission has the characteristics of large transmission capacity, long transmission distance, high voltage, and can be used for asynchronous networking of power systems, and its application range is becoming wider and wider. In order to meet the development needs of UHV DC transmission, it is particularly important to carry out research work on the safe and stable operation of DC control and protection systems. The DC control board is used to control the DC output circuit board. If the DC control board fails and causes DC blocking, it will seriously affect the safe operation of the power grid. Therefore, a control protection board is set for the DC control board t...

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 邢超李胜男刘明群郭成覃日升周鑫赵勇帅何鑫杨楠
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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