Method and device for generating high-precision synchronous clock

Abstract

The invention discloses a method and device for generating a high-precision synchronous clock. The method is used for generating and outputting a second second impulse synchronizing with a first second impulse of a first clock source. The method comprises the steps of: comparing phase relations of the second second impulse and the first second impulse; regulating a frequency division factor according to the phase relations; and controlling the quantity of impulses of a crystal oscillator corresponding to the second second impulse according to the frequency division factor to output the second second impulse. The device comprises a phase comparing unit, a PID (Proportion Integration Differentiation) control unit and a synchronizing signal output unit. According to the invention, the frequency division factor of the crystal oscillator second clock is controlled through measuring the phase different between a GPS second clock and the crystal oscillator second clock, and a cumulative error of the crystal oscillator second clock is eliminated in real time, thus a high-precision second clock is generated. The invention has the advantages of good stability, high synchronism and simple implementation process.

Description

technical field [0001] The invention belongs to the technical field of synchronous control, in particular to a method and device for generating a synchronous clock. Background technique [0002] Global Positioning System (GPS) synchronous clock has been widely used in power system, and people are exploring various new methods to develop power system monitoring, protection and control by utilizing its excellent time synchronization performance. At present, power grid fault analysis requires the time information of each microcomputer device to be accurate within 1 ms, the phase measurement of the power grid requires clock accuracy as high as microseconds, and the clock accuracy requirements for traveling wave ranging and traveling wave protection reach 1 μs or even higher. . The clock of the satellite positioning system, such as the Global Positioning System (GPS), as a navigation, timing and positioning system, has the characteristics of high timing accuracy, free of charge ...

AI Technical Summary

Problems solved by technology

However, the calculation of the compensation scheme of this method is more complicated, and the amount of sample data is larger, which has higher requirements on the computing power of the CPU.

In addition, in the new method of GPS high-precision synchronous clock generation based on the principle of digital phase-locking ("Power System Automation", Volume 33, Issue 18, 2009), a method for realizing a high-precision clock with a relatively simple compensation scheme is proposed, but this method The real-time performance is not high, and its application is limited

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