Synchronous and in-time self-tracking self-compensation method

Abstract

The invention discloses a synchronous and in-time self-tracking self-compensation method, which is characterized by comprising the following steps that: 1) a reference clock data acquisition module receives an external signal, digitalizes the received signal and simultaneously performs advanced fault tolerance judgment on an externally input synchronization signal; 2) if the externally input synchronization signal is judged to be correct, the reference clock acquisition module generates a corresponding internal pulse and acquires and stores crystal oscillation signals at different temperatures; 3) the reference clock acquisition module performs signal decomposition at an equal interval according to an acquired current value and a sampling interval, divides the number of sampling points ina unit time by the current value, and uniformly distributes a remainder into the sampling interval as a synchronous sampling pulse; and 4) after the step 3) is finished and when external reference time input is invalid, stored reference information is extracted according to temperature information.

Description

technical field [0001] The invention relates to a self-tracking and self-compensating method for synchronous time keeping. Background technique [0002] In equipment that needs timekeeping, such as MU (merging unit) or IED equipment (measurement, control and protection device) of the smart grid, in our current time synchronization scheme design, it is required that the device or external equipment accept synchronous clock calibration (such as Beidou Signal or GPS second pulse input signal), and according to the input synchronous pulse, according to the required number of sampling points, it is divided equally, and the synchronous sampling pulse is sent out, the purpose is to ensure the timing and punctuality accuracy between devices (or between devices). The sampling pulse synchronization error between the realization devices should not be greater than 1us. After the input sync pulse disappears, the IED or MU should be able to maintain a high timing accuracy. [0003] Howe...

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Problems solved by technology

[0003] However, in most designs at present, since the synchronization pulse cannot be divisible by the number of sampling points, a large accumulated error is caused, and the accuracy requirement cannot be guaranteed. Moreover, after the synchronization pulse disappears, due to the discreteness of the crystal oscillator and temperature changes, it is impossible to maintain a relatively high frequency. High time keeping accuracy