Multimachine Phase Synchronization via Optical Fiber Encoding

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Solution Overview

Problem

Existing multimachine phase synchronization methods in power supply systems face challenges in achieving real-time accuracy and tracking phase changes, with either high real-time capability but low accuracy using zero-crossing signals, or high accuracy but low real-time capability using reference source phase-lock techniques.

Innovation Solution

A system and method for multimachine phase synchronization based on optical fiber transmission, where a master generates a digital reference source and encodes phase information to create a synchronous phase code value, transmitted through optical fibers to slaves, enabling real-time phase synchronization with high accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If zero-crossing signal transmission is used for phase synchronization, then real-time capability is improved, but accuracy deteriorates

Engineering Contradiction:

Improvereal-time capabilityVSAvoidsynchronization accuracy

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The patent replaces traditional electrical signal transmission (zero-crossing signals) with optical fiber transmission. The master converter encodes phase information into optical signals that are transmitted to slave converters, achieving both high real-time capability and high synchronization accuracy. The optical transmission medium eliminates the limitations of electrical signal methods while maintaining real-time performance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If reference source phase-lock technique is used for phase synchronization, then accuracy is improved, but real-time capability deteriorates

Engineering Contradiction:

Improvesynchronization accuracyVSAvoidreal-time capability

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The patent replaces complex electrical phase-locking circuits with optical fiber transmission of encoded phase information. The master converter encodes phase data into optical signals that are transmitted to slaves, which decode and apply the phase information directly. This eliminates the delay effects and circuit complexity of traditional phase-lock techniques while maintaining high accuracy and real-time performance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses digital encoding to create a copy of the master's phase information and transmits it optically to slaves. Instead of requiring slaves to actively lock onto the master's reference source, the system simply copies and transmits the phase data, which slaves then apply to their local references. This copying approach dramatically reduces complexity and improves real-time capability while maintaining accuracy.

Inventive Principle:

Principle #26Copying

3Reliability

If analog reference source transmission is used, then phase change tracking is improved, but device complexity increases

Engineering Contradiction:

Improvephase change trackingVSAvoidimplementation circuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces analog reference source transmission with digital optical transmission. The master converter encodes phase information into digital optical signals that are transmitted to slave converters. This substitution eliminates the need for complex analog phase-locking circuits while maintaining the ability to track phase changes in real-time. The digital encoding approach simplifies the overall system architecture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Measurement precision

If optical fiber transmission is used for phase synchronization, then synchronization accuracy is improved, but transmission delay may increase

Engineering Contradiction:

Improvesynchronization accuracyVSAvoidtransmission delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent implements a pre-negotiated optical transmission path between master and slave converters. The physical connection is established in advance, and the transmission characteristics are known and stable. This preliminary setup allows the system to compensate for fixed transmission delays through calibration, ensuring that the optical transmission does not introduce significant timing errors while maintaining high synchronization accuracy.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12278697B2System and method for multimachine phase synchronization based on optical fiber transmission

Publication Date: 2025.04.15 ILD ELECTRONICS CO LTD

AI summary

A system and a method for multimachine phase synchronization based on optical fiber transmission are provided. The system includes a master and a plurality of slaves, where an optical fiber transmitting interface of the master is connected to an optical fiber receiving interface of one slave, the slave connected to the master is connected in series with the other slaves in turn, the master transmits phase information of a digital reference source thereof as a system synchronous phase signal to the slave connected to the master, the slave takes the received system synchronous phase signal as a phase of the local digital reference source, and transmits the system synchronous phase signal to a slave connected to an optical fiber transmitting interface of the slave through the optical fiber transmitting interface, and when the last slave is connected to the master, the master and the slaves form a closed-loop communication test.