Ring Bus Fault Protection for Dynamic Positioning Vessels
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Solution Overview
Problem
Dynamically positioned vessels face challenges in maintaining power system integrity and efficiency during high-risk operations due to fault propagation, leading to increased fuel consumption, maintenance costs, and blackout risks.
Innovation Solution
A fault protection system with a power distribution bus configured in a ring with bus ties and circuit breakers, utilizing differential and directional protection relays to isolate faults quickly and prevent propagation, ensuring continued operation of critical components like thrusters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power system sections are electrically isolated to prevent fault propagation, then reliability is improved, but fuel consumption increases due to multiple engines running at reduced load
Solution Approach 1:
The system dynamically adjusts the configuration of bus ties based on operational conditions. During normal operation, bus ties are closed to allow interconnected operation for fuel efficiency. During fault conditions, the protection system dynamically opens specific bus ties to isolate faults while maintaining operational sections, enabling the system to transition between connected and isolated states as needed
Solution Approach 2:
The power distribution bus is segmented into multiple bus subsections with individual circuit breakers and protection zones. This segmentation allows selective isolation of faulted sections while maintaining connectivity in non-faulted sections, enabling the system to operate with fewer engines at higher load rather than requiring all engines to run at reduced load
2Use of energy by moving object
If bus ties are connected to allow interoperation of power system sections, then fuel consumption decreases, but fault propagation risk increases leading to total blackout
Solution Approach 1:
Differential protection relays act as intermediaries that continuously monitor current flow through bus ties and circuit breakers. These relays detect faults through current imbalance measurements and trigger selective tripping of circuit breakers to isolate faults while maintaining connectivity in non-faulted sections, enabling fuel-efficient interconnected operation with protected fault isolation capability
Solution Approach 2:
The protection system uses continuous feedback from differential protection relays that monitor current flow through bus ties and circuit breakers. When a fault is detected through current imbalance, the system provides feedback signals to trip appropriate circuit breakers, automatically adjusting the system configuration to maintain reliability while allowing interconnected operation for fuel efficiency
3Reliability
If multiple engines run in parallel at reduced load to supply isolated power system sections, then power system integrity is maintained, but maintenance costs increase due to soot accumulation and higher operating hours
Solution Approach 1:
The system dynamically reconfigures power distribution based on operational needs, allowing engines to operate at optimal load levels when sections are interconnected. This reduces unnecessary operating hours and soot accumulation compared to continuous operation at reduced load, while maintaining the ability to isolate sections when faults occur
Solution Approach 2:
The segmented bus structure with individual circuit breakers enables selective operation of power system sections. This allows engines to supply larger loads efficiently when sections are connected, reducing total operating hours and maintenance needs compared to running multiple engines at reduced load in isolated configurations
Data Source
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AI summary
A fault protection system of a power system of a dynamically positioned vessel is provided. The power system has a power distribution bus separated into three or more bus subsections, electric connections including bus ties which connect the bus subsections in a ring configuration and circuit breakers connected between the bus subsections to break the electric connections. For at least one of the bus subsections, the fault protection system includes a generator circuit breaker for coupling a generator to the bus subsection, one or more feeder circuit breakers for coupling one or more loads to the bus subsection, a first circuit breaker via which a first end of the bus subsection is connected to a bus tie, the bus tie providing the electric connection to another bus subsection in said ring configuration, the first circuit breaker being a bus tie breaker, a second circuit breaker for coupling a second end of the bus subsection to a further bus subsection in said ring configuration, protection relays coupled to the circuit breakers for operating the circuit breakers, and communication links between the protection relays, the protection relays being configured to exchange information via said communication links.