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High-precision time keeping method and device suitable for power distribution network measuring device

A distribution network, high-precision technology, applied in the direction of measuring devices, circuit devices, devices for measuring time intervals, etc., can solve the problem of discontinuity of the second pulse signal, uncertainty of left shift or right shift, and clock time accuracy that cannot meet the requirements and other issues to achieve the effect of improving clock accuracy and promoting synchronous clock design

Pending Publication Date: 2022-04-15
国网内蒙古东部电力有限公司通辽供电公司 +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, since the second pulse signal generated by the lock ring circuit is discontinuous, it cannot be determined whether it is shifted to the left or to the right, so the time accuracy of the clock in this method cannot meet the requirements.

Method used

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  • High-precision time keeping method and device suitable for power distribution network measuring device
  • High-precision time keeping method and device suitable for power distribution network measuring device
  • High-precision time keeping method and device suitable for power distribution network measuring device

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Embodiment 1

[0048] The following is a further description of a high-precision timekeeping method suitable for distribution network measurement devices provided by the embodiments of the present invention in conjunction with the accompanying drawings and specific embodiments. See the following description for details:

[0049] see Figure 1 to Figure 3 , the embodiment of the present invention is a modeling based on the dual-mode satellite signal data received by the device. First, the adaptive Kalman filter based on wavelet analysis is used to process the received time data to increase the utilization rate of the data. The preprocessed data is modeled by the least square method to realize the prediction of the clock offset of the crystal oscillator. The specific steps are:

[0050] Step 101: establishing a mathematical model of a time-linear discrete system;

[0051] Y i = θ i,i-1 Y i-1 +L i V i-1 ,i≥1

[0052] x i =H i Y i +W i (1)

[0053] Among them, Y i ∈ R n×1 is the s...

Embodiment 2

[0086] A high-precision timing device suitable for distribution network measurement devices, see Figure 4 , the device includes: a processor 1 and a memory 2, the memory 2 stores program instructions, and the processor 1 invokes the program instructions stored in the memory 2 to make the device perform the following method steps in Embodiment 1:

[0087] Establish a mathematical model of a time-linear discrete system to realize mathematical modeling of crystal oscillator time data;

[0088] Use wavelet transform to determine the noise level and estimate the noise variance of the discrete system;

[0089] Adaptive Kalman filter based on wavelet transform to estimate the variance matrix of measurement noise online;

[0090] Establish temperature change and frequency change curves, and substitute the temperature change curve into the formula of frequency change curve to obtain the formula of frequency change with time;

[0091] Establish the relationship between crystal oscill...

Embodiment 3

[0110] Based on the same inventive concept, an embodiment of the present invention also provides a computer-readable storage medium, the storage medium includes a stored program, and when the program is running, the device where the storage medium is located is controlled to execute the method steps in the above embodiments.

[0111] The computer-readable storage medium includes, but is not limited to, flash memory, hard disk, solid-state hard disk, and the like.

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Abstract

The invention discloses a high-precision time keeping method and device suitable for a power distribution network measuring device, and the method comprises the following steps: building a mathematical model of a time linear discrete system, and achieving the mathematical modeling of crystal oscillator time data; determining the noise level by using wavelet transform, and estimating the noise variance of the discrete system; evaluating the variance matrix of the measurement noise on line based on adaptive Kalman filtering of wavelet transform; establishing a temperature change curve and a frequency change curve, and substituting the temperature change curve into a frequency change curve formula to obtain a formula that the frequency changes along with time; establishing a relationship between the crystal oscillator time and the standard time and a relationship between the crystal oscillator frequency and the standard frequency, and calculating a frequency value of a local clock generated by the crystal oscillator and the standard time; a deviation curve of the temperature and the time relative to a crystal oscillator local clock and a standard clock is fitted by using a least square method, and the deviation curve is used for improving the precision of a system synchronous clock. The device comprises a processor and a memory. The device improves the precision of the synchronous clock.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a high-precision timekeeping method and device suitable for distribution network measuring devices. Background technique [0002] The main supporting role in my country's current energy structure is still traditional energy. Although the proportion of new energy is increasing year by year, it is still only a small part of the overall energy structure. Energy consumption is increasing day by day, and traditional energy is mostly non-renewable, while new energy is generally based on renewable energy such as water energy, solar energy, wind energy, and tidal energy. Therefore, compared with traditional energy, new energy is more environmentally friendly. It is more beneficial, but the power generation of new energy is unstable. If a large number of distributed new energy is connected to the distribution network, and a large number of power electronic devices are involved in the distributi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G01S19/25G04F8/02G06F17/18
Inventor 于泽龙梁帅赵新力袁在吉曹志刚丁仁杰冷长山张翼翔李曙光王长江
Owner 国网内蒙古东部电力有限公司通辽供电公司
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