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System and method for improving performance of DCS platform clock source of nuclear power plant

A nuclear power plant and platform technology, applied in the direction of electrical components, automatic power control, etc., can solve problems such as increased frequency accuracy error, signal-to-noise ratio deterioration, stability and reliability risks, etc.

Active Publication Date: 2021-07-06
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The DCS platform of a nuclear power plant usually uses an ordinary active crystal oscillator as the platform clock source. The frequency accuracy of this clock source is guaranteed by its own stability and aging rate at the starting point of the factory, and its frequency accuracy error will increase with time and The change of environmental factors such as temperature will gradually increase; large clock jitter will lead to the deterioration of the signal-to-noise ratio of the ADC sampling output, and will also increase the bit error rate of the digital communication system, which makes the stability and reliability of the DCS platform of the nuclear power plant have certain problems. risk

Method used

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  • System and method for improving performance of DCS platform clock source of nuclear power plant
  • System and method for improving performance of DCS platform clock source of nuclear power plant
  • System and method for improving performance of DCS platform clock source of nuclear power plant

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Embodiment 1

[0046] This embodiment has proposed a nuclear power plant DCS platform clock source performance improvement system, for example figure 1 As shown, the system of the present embodiment includes a GPS receiver, a digital cable, a digital loop filter, a frequency control word selector, a direct digital frequency synthesizer, and a divider.

[0047] Based on the principle of phase locked loop, the design of digital clarifier, digital loop filter, and direct digital frequency synthesizer.

[0048] This embodiment uses the crystal frequency characteristic training model based on the Kalman algorithm to perform the frequency control word and the linear relationship prediction of the board ambient temperature.

[0049] The module of the system overall architecture will be described in detail below:

[0050] 1.GPS receiver

[0051] The GPS receiver receives the GPS signal, parsing and outputting a 1PPS second pulse signal having high stability, high-precision characteristics as a digital p...

Embodiment 2

[0094] Based on the system proposed in Example 1, this implementation proposes a method of improved clock source performance, which includes:

[0095] 1.GPS signal is present, at which time the system is in a tame mode. Digital phase-locked loop allows system output signals to keep the high stability of the GPS receiver output, high precision 1PPS second pulse signal; at this time, the system output signal is far better than the crystal oscillator provides clock characteristics;

[0096] 2. When the GPS signal is present, the crystal frequency characteristic training model is based on historical frequency control words and historical board temperature and system runtime prediction direct digital frequency synthesizer frequency control word and runtime and temperature of temperature;

[0097] 3. When the GPS signal is lost, the system is in maintenance mode. At this time, the digital phase-locked loop will no longer work, the crystal frequency characteristic training model no longe...

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Abstract

The invention discloses a system and method for improving performance of a DCS platform clock source of a nuclear power plant. The system comprises a GPS receiver, a digital phase discriminator, a digital loop filter, a frequency control word selector and a direct digital frequency synthesizer. The receiver is used for receiving the GPS signal, analyzing the GPS signal and outputting a 1PPS (pulse per second) signal; the digital phase discriminator is used for outputting a control word linearly related to a difference value according to the phase difference value between the input 1PPS of the receiver and the 1PPS of the local clock source subjected to frequency division by the frequency divider; the digital loop filter processes the control word output by the digital phase discriminator and outputs a frequency control word; and the frequency control word selector selects and outputs a corresponding frequency control word according to a system working mode so as to drive the direct digital frequency synthesizer to output a corresponding clock signal of which the performance is superior to the frequency characteristic of a local clock source. The stability and reliability of the DCS platform system of the nuclear power plant are improved.

Description

Technical field [0001] The present invention belongs to the field of nuclear power plant instrument, and therefore refer to a nuclear power plant DCS platform clock source performance improvement system and method. Background technique [0002] Nuclear power plant DCS platform usually uses ordinary active crystals as platform clock sources. The frequency accuracy of this clock source is guaranteed by its own stability and aging rate in its factory starting point. The frequency accuracy error will over time and Changes in environmental factors such as temperature, gradually increase; large clock shake will cause the signal-to-noise ratio of the ADC sampling output to increase the error rate of the digital communication system, so that the stability and reliability of the nuclear power plant DCS platform risk. Inventive content [0003] In order to improve the stability and reliability of nuclear power plants, the present invention provides a nuclear power plant DCS platform clock...

Claims

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Application Information

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IPC IPC(8): H03L7/085H03L7/099H03L7/18
CPCH03L7/085H03L7/099H03L7/18
Inventor 谌志强张文帅赵洋魏荣超水璇璇徐孝芬陈起汪亨
Owner NUCLEAR POWER INSTITUTE OF CHINA