Time synchronizing method capable of recognizing GPS input signals in self-adapting manner

Abstract

The invention discloses a time synchronizing method capable of recognizing GPS input signals in a self-adapting manner, relating to a technology for realizing precise time synchronization for a relay-protection and automatic device of an electric power system by utilizing a GPS. In the method, GPS time-synchronizing signals are judged and are unified to be synchronous PPS (Pulse Per Second) signals to be transmitted, thus the self-adaptation of various GPS time-synchronizing signals can be realized, and a set of equipment can be suitable for various situations and has strong applicability, so that the investment of the equipment is reduced. The function is realized by utilizing an FPGA (Field Programmable Gate Array) existing in the equipment, and the problem that transformer substations utilize different types of GPS time-synchronizing information is solved on the premise of not increasing any hardware costs. When an IRIG-B (Inter-Range Instrumentation Group-B) signal and a pulse signal exist at the same time, the IRIG-B signal containing more information content is preferably selected as the reference to carry out corresponding PPS pulse output, thus the stability and the precision of the electric power system are improved. In addition, the PPS pulse transmission can be carried out according to an original clock under the condition that the GPS signals are lost so that the system can be ensured to run normally.

Description

technical field [0001] The invention relates to a time synchronization method for adaptively identifying GPS input signals. Background technique [0002] Various automation devices are installed in the modern power system, such as the measurement and control unit of the monitoring system, RTU, fault recorder, microcomputer protection device, SCADA, and so on. These devices have real-time clocks inside, but these clocks will inevitably have errors. If they are not calibrated in time, the errors will accumulate and become larger and larger. In the power system, automatic information transmission, relay protection and automatic devices all need an accurate and unified clock. Based on this unified time base, when an abnormality or fault occurs in the power system, the waveform provided by the unified clock is of reference value, and can correctly judge the cause of the fault, the sequence of actions of various protections and automatic devices, and the evolution and evolution o...

AI Technical Summary

Problems solved by technology

[0005] (2) Time message, including time information and other information, there is no unified format at present, and RS-232 serial port is generally used for transmission;

In these methods, either cannot flexibly adapt to the needs of the site, are prone to errors and make the relay protection and automatic devices work abnormally, or increase the complexity of the system and increase the cost

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