Time hacking and punctuality system and method based on temperature compensation

Abstract

The invention provides a time hacking and punctuality system and method based on temperature compensation for intelligent substation intelligent devices. The method includes that firstly, crystal oscillator frequency measuring is finished through outer pulse per second, and frequency measuring precision of a crystal oscillator is greatly improved; secondly, temperature measuring of a crystal oscillator environment is finished in real time through a temperature measuring chip on the periphery of the crystal oscillator; thirdly, crystal oscillator temperature frequency coefficient calculation is finished through a temperature frequency characteristic equation of the crystal oscillator by considering actual measurement errors; fourthly, the width of the pulse per second is calculated in real time through the temperature frequency coefficient; fifthly, under the condition that the outer pulse per second is normal, the outer pulse per second is output directly; sixthly, under the condition that the outer pulse per second is disappeared, the pulse per second obtained through calculation is used as output. Under the condition of keeping the time hacking and punctuality precision, technical index requirements of the crystal oscillator can be effectively reduced, design cost is reduced, and reliability and environment applicability of the system and method are improved.

Description

technical field [0001] The invention designs a time synchronization system and method based on temperature compensation, and belongs to the technical field of intelligent substation automation. Background technique [0002] With the deepening of the construction of intelligent substations, the indicators of intelligent secondary equipment have been greatly improved. In order to obtain high-precision process layer sampling data, new requirements are put forward for the clock accuracy of process layer equipment. Especially for the merging unit, it is proposed that the sampling synchronization error should not be greater than ±1μs, and after the external synchronization signal disappears, it can meet the synchronization accuracy requirement of 4μs at least within 10min. This requires that the clock error of the secondary smart device must be less than 1 μs when the external clock is normal, and can maintain an accuracy of 4 μs within 10 minutes when the external clock is lost....

AI Technical Summary

Problems solved by technology

The aging rate of the crystal oscillator at high temperature is much higher than that at low temperature. The aging of the constant temperature crystal oscillator will greatly reduce the service life of the equipment. In severe cases, it may cause frequency drift and cause the entire clock system to be disordered.

In addition, the volume and cost of the constant temperature crystal oscillator are also higher than that of the temperature compensated crystal oscillator.

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