Inter-Island Power Transmission Switching to DC on Cable Fault
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Solution Overview
Problem
Inter-island power transmission systems face challenges in maintaining efficient power delivery when one phase of a three-phase power cable is open, leading to disruptions and potential damage due to direct current conversion inefficiencies.
Innovation Solution
An electronic system is deployed on each end of a medium voltage three-phase power cable that senses an open cable and switches to direct current transmission on the remaining two good cables, with conversion back to three-phase power at the receiving end, utilizing sensors and processors to analyze and adjust power factors for optimal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three-phase power transmission is used on a medium voltage cable between islands, then efficient power delivery is achieved, but the system is vulnerable to disruptions when one phase becomes open
Solution Approach 1:
The system dynamically switches between three-phase AC power transmission and DC power transmission modes based on the operational status of the cables. When an open phase is detected, the system automatically transitions to DC transmission using the remaining two healthy cables, and vice versa, ensuring continuous and reliable power delivery despite cable faults
Solution Approach 2:
The system changes the fundamental transmission parameters by switching between AC and DC power transmission modes. This parameter change allows the system to adapt to different cable configurations and maintain efficient power delivery even when the cable structure is compromised
2Reliability
If the system switches to DC power transmission when one phase is open, then continuous power delivery is maintained, but direct current conversion inefficiencies occur
Solution Approach 1:
The system continuously monitors the operational status of the three-phase cables and provides feedback to the control mechanism. When an open phase is detected, the feedback triggers automatic switching to DC transmission mode. The system also monitors transmission efficiency and can switch back to three-phase mode when all cables are healthy, thereby minimizing energy losses from unnecessary DC conversion
Solution Approach 2:
The system dynamically adjusts the power transmission mode based on real-time cable conditions, switching between AC and DC modes only when necessary. This dynamic adaptation ensures continuous power delivery while minimizing the time and frequency of DC conversion, thereby reducing energy losses associated with conversion inefficiencies
3Adaptability or versatility
If electronic boxes are placed on each end of the power cable to enable switching, then adaptability to faults is improved, but device complexity increases
Solution Approach 1:
The electronic boxes placed at each end of the power cable perform multiple functions: they monitor the operational status of the three-phase cables, control the switching between AC and DC transmission modes, and manage the power conversion processes. This multi-functionality reduces the need for separate dedicated devices for each task, thereby limiting the increase in overall system complexity while maintaining high fault tolerance capability
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
This solution ensures continuous and efficient power transmission by minimizing deviations in phase, amplitude, and power factor variations, extending the life of the cables and maintaining reliable power distribution between islands.
Implementation Method 1
switches to direct current power transmission on the remaining two good cables
Implementation Method 2
The direct current power is converted back to three phase power transmission on the receiving end of the direct current power
Data Source
AI summary
In a particular illustrative embodiment of the present invention, an inter-island power transmission system is disclosed. An electronic box is placed on each end of a medium voltage three phase power cable running between two islands. The electronic box senses an open cable on the three phase cable and switches to direct current power transmission on the remaining two good cables. The direct current power is converted back to three phase power transmission on the receiving end of the direct current power.