HVDC Redundant Control Optical Communication Modules
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Solution Overview
Problem
Redundant control devices in high voltage direct current (HVDC) transmission systems face issues with data disconnection and noise interference, leading to malfunction, particularly when using SCSI cables for communication.
Innovation Solution
A redundant control device with a new structure utilizing optical communication modules between systems and change over logic units to monitor and switch control between active and standby systems, ensuring reliable data transmission and minimizing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SCSI cables are used for communication between redundant control devices, then data transmission is established, but disconnection and noise interference occur leading to malfunction
Solution Approach 1:
The patent replaces electrical signal transmission through SCSI cables with optical signal transmission through optical communication modules. This substitution eliminates electromagnetic interference and noise issues inherent in electrical cable systems, thereby resolving the contradiction between establishing data transmission and avoiding noise interference.
Solution Approach 2:
The patent introduces optical communication modules as an intermediary between the first and second control devices. These modules convert electrical signals to optical signals for transmission, acting as a mediator that isolates the control devices from electrical interference while maintaining reliable data communication.
2Measurement precision
If voltage checking is performed to verify counterpart system operation, then system monitoring is achieved, but noise affects the voltage signal causing malfunction
Solution Approach 1:
The patent replaces electrical voltage-based status checking with optical signal-based status checking. The optical communication modules transmit status information through optical signals that are immune to electromagnetic noise, thereby achieving precise system monitoring without noise interference.
Solution Approach 2:
The patent uses optical copies of status information transmitted through optical communication modules instead of directly measuring electrical voltages. This copying approach allows status verification without exposing the measurement system to electrical noise.
3Ease of operation
If redundant control devices are connected through electrical cables, then communication is established, but wiring problems and disconnection occur
Solution Approach 1:
The patent substitutes electrical cable connections with optical communication module connections. This replacement eliminates the wiring and disconnection problems associated with electrical cables while maintaining ease of system connection through standardized optical interfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables reliable data transmission and improved system stability by using optical communication modules to monitor connection states and data validity in real-time, reducing malfunctions and enhancing the reliability of HVDC transmission systems.
Implementation Method 1
there are optical communication modules between the first system and the first COL, between the first COL and the second COL, and between the second system and the second COL to transmit and receive data
Data Source
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AI summary
A redundant control device of a high voltage direct current (HVDC) transmission system is provided. The redundant control device includes a first system and a second system that performs a function corresponding to that of the first system; and a first change over logic (COL) and a second COL that determine whether to switch between the first system and the system, wherein there are optical communication modules between the first system and the first COL, between the first COL and the second COL, and between the second system and the second COL to transmit and receive data, and the first COL and the second COL includes a monitoring control unit that checks a connection or wiring state of the optical communication modules and validity of transmission data.