Multi-machine phase synchronization system and method based on optical fiber transmission

Abstract

The invention discloses a multi-machine phase synchronization system and method based on optical fiber transmission, the system comprises a master device and a plurality of slave devices, an optical fiber transmitting interface of the master device is connected with an optical fiber receiving interface of one slave device, and the slave device connected with the master device is sequentially connected with other slave devices in series. The master device transmits the phase information of the digital reference source of the device as a system synchronization phase signal to the slave device connected with the master device, and the slave device uses the received system synchronization phase signal as the digital reference source phase of the device; the system synchronous phase signal is sent to the slave device connected with the slave device optical fiber emission interface through the optical fiber emission port, and when the last slave device is connected with the master device, the master device and the slave device form a closed-loop communication test. Synchronous phase code values are transmitted in real time in high-speed optical fiber communication, accuracy is high, phase changes can be tracked in real time, and good synchronization performance and expansibility are achieved in a multi-machine power system.

Description

technical field [0001] The invention relates to the technical field of multi-machine systems, in particular to a multi-machine phase synchronization system and method based on optical fiber transmission. Background technique [0002] Multi-machine phase synchronization is widely used in power system. In the multi-phase system, the slave device realizes the phase difference to the master device on the basis of synchronizing the phase of the master device; the multi-machine power supply device also inverts the phase by adding a 180-degree phase difference after synchronizing the phase, and then realizes the boost in series. The real-time performance and accuracy of multi-machine phase synchronization are the two main points in the application. At present, there are two main methods for phase synchronization in the multi-machine system. One is to transmit the zero-crossing signal. The master device sends the synchronous zero-crossing signal to the slave device. The slave devic...

AI Technical Summary

Problems solved by technology

At present, there are mainly two methods for phase synchronization in multi-machine systems. One is to transmit the zero-crossing signal. The master device sends a synchronous zero-crossing signal to the slave device, and the slave device receives the synchronous zero-crossing signal. Phase synchronization has strong real-time performance, but the accuracy is not high. It is synchronized once in a cycle, especially when the frequency changes, the phase change cannot be accurately tracked, and a phase mutation will occur; the other is the reference source phase-locked technology, which will The analog reference source is sent to the slave device, and the slave device discriminates its frequency, locks the phase, and obtains the phase information

The accuracy is high, and it can track the change of the phase, but the implementation circuit is relatively complicated, and the real-time performance cannot meet the requirements, and there is a certain delay effect

Images