Subsea Control System Redundancy for Bumpless Communication Changeover
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Solution Overview
Problem
Existing subsea control systems lack redundancy and fail to provide seamless transitions between primary and backup controllers, leading to potential communication failures and maintenance challenges in underwater operations.
Innovation Solution
A subsea control system with redundant topside and subsea components, including logic controllers, electronics manifolds, and communication links, enabling instantaneous transitions between primary and backup communication modes to ensure continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant controllers and devices are implemented, then system reliability is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into multiple independent communication channels (first and second communication channels) with separate logic controllers (first and second logic controllers) and electronics manifolds. Each channel operates autonomously, allowing the system to maintain functionality even if one channel fails, thus improving reliability while managing complexity through modular architecture.
Solution Approach 2:
The system implements dynamic parameter changes by enabling instantaneous switching between different communication modes (first communication mode through fourth communication mode) based on detected faults. This allows the system to adapt its communication parameters in real-time to maintain reliability without requiring complete system redesign.
2Loss of time
If instantaneous transition between communication modes is implemented, then loss of time is reduced, but device complexity increases
Solution Approach 1:
The system performs preliminary actions by pre-configuring multiple communication channels and establishing all necessary communication paths before faults occur. The first and second communication channels are both active and ready, with all electronics modules prepared to switch modes instantaneously when needed, eliminating transition delays without requiring complex real-time decision algorithms.
Solution Approach 2:
The electronics manifolds and communication links serve as intermediaries that facilitate instantaneous mode transitions. These intermediary components buffer and manage the switching between communication modes, absorbing the complexity of transition management while presenting a simple, seamless interface to the overall system operation.
3Reliability
If multiple communication channels and redundancy are implemented, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The control system implements self-service by automatically detecting faults and transitioning between communication modes without human intervention. The system monitors its own communication channels and autonomously switches to backup modes when faults are detected, maintaining simple operation for users while ensuring high reliability through automated redundancy management.
Solution Approach 2:
The system employs feedback mechanisms where the detection of communication faults triggers automatic mode transitions. This closed-loop feedback ensures that the system continuously monitors its own status and self-corrects by switching to alternative communication paths, maintaining both reliability and operational simplicity through automated control.
Data Source
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AI summary
A subsea control system includes a first logic controller located topside, a first electronics manifold located subsea, and a first cable operable to provide communication between the first logic controller and the first electronics manifold. A second logic controller is located topside, a second electronics manifold is located subsea, and a second cable is operable to provide communication between the second logic controller and the second electronics manifold. A device includes a lead device operably connected to a lead electronics module, a backup device operably connected to a backup electronics module, a lead connector connected to the lead electronics module, and a backup connector connected to the backup electronics module. A third cable provides communication between the first electronics manifold and the lead connector and a fourth cable provides communication between the second electronics manifold and the backup connector. A first communication link is provided between the first logic controller and the second logic controller, and a second communication link is provided between the lead electronics module and the backup electronics module. The first communication link and the second communication link cooperate to facilitate the instantaneous transition between multiple communication modes.