Time source selecting and switching method capable of improving time service output reliability

A reliable, time-sourced technology, applied in time-division multiplexing systems, electrical components, multiplexing communications, etc. The effect of reliability

Active Publication Date: 2015-12-02
山东中瑞电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process ignores the frequency difference and phase difference between the two time sources. When the frequency difference or phase difference is large, direct switching will cause a large instantaneous jump in the timing output punctual signal.
PMU devices that require high time synchronization accuracy will have a serious impact

Method used

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  • Time source selecting and switching method capable of improving time service output reliability
  • Time source selecting and switching method capable of improving time service output reliability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: as figure 1 As shown, the time source selection and switching method for improving the timing output reliability of the present invention includes a clock synchronization device, the clock synchronization device is provided with a plurality of input time sources, the clock synchronization device is provided with a time source processing unit, and the time source processing unit Select the best time source according to the synchronization situation, phase difference and priority of each time source, switch the best time source to the timing source when the status of each time source changes, and use smooth tracking when switching time sources switch.

Embodiment 2

[0026] Embodiment 2: On the basis of the structure described in embodiment 1, the time source processing unit comprises FPGA1 and 32 processors 2, FPGA1 and 32 processors 2 communicate by data bus and address bus, and 32 processors 2 select at first Synchronized time sources, and then select two time sources whose phase difference is within the standard difference time among the synchronized time sources, and finally sort the selected time sources according to the priority set by the customer, select the first time source, time source Including external time source and local time source, the standard difference time is recorded as P_th, which is 3μs-7μs, and the specific selection logic is: the subscript "0" represents the local time source, the subscript "1-5" represents the external time source, the following The marks "x" and "y" represent arbitrary and different external time sources, for example "|ΔTS 01 |" is the phase difference between the local time source and the fir...

Embodiment 3

[0031] Embodiment 3: on the basis of the structure described in embodiment 2, as figure 2 As shown, the smooth tracking switch includes deviation time, deviation standard time and tracking time. FPGA1 continuously measures the deviation time between the time source to be changed and the original time source, and triggers the 32-bit processor 2 to perform circular tracking when the time source is switched. 32 Bit processor 2 increases the tracking time once in each cycle until the deviation time is less than the deviation standard time, the cycle tracking stops, FPGA1 directly outputs the time of the time source to be changed, the deviation standard time is 0.1μs-1μs, and the tracking time is 0.1μs -0.5μs.

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PUM

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Abstract

The invention provides a time source selecting and switching method capable of improving time service output reliability and belongs to the field of time source switching methods. The time source selecting and switching method comprises: a clock synchronization device is employed, which is provided with a plurality of input time sources and a time source processing unit; the time source processing unit selects the optimal time source according to the synchronization condition, the phase difference and the priority of each time source and switches the optimal time source to a time source for time service when the state of each time source changes; at external time source switching and time-keeping recovery stages, the time source switching is performed in a smooth tracking switching mode to ensure that the clock synchronization device can select the optimal time source according to the continuously changing dynamics of each time source; besides, continuous tracking and gradually approaching can be realized, and over-large spaced skipping can be avoided.

Description

technical field [0001] The invention provides a time source selection and switching method for improving the reliability of timing output, and belongs to the field of time source switching methods. Background technique [0002] The scale of the power grid continues to expand, the power equipment and parameters are more diverse, and the requirements for the reliability of power system clock synchronization are also higher. [0003] In order to improve the reliability of timing output, current clock synchronization devices usually use multiple wireless or local wired timing sources such as external GPS / Beidou, IRIG-B, and internal high-stable crystal oscillators or atomic clocks as input timing sources. For a clock synchronization system, a method of mutual backup of devices is usually adopted. [0004] When the clock synchronization device uses multiple input clock sources, there must be switching problems between different clock sources, including switching between external...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
Inventor 张剑波李为李学鹭宋仁杰
Owner 山东中瑞电气有限公司
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