DC Voltage Switch with Disconnectable Longitudinal Source
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Solution Overview
Problem
Existing DC voltage switch devices are inefficient for long-term load flow control due to continuous losses from the longitudinal voltage source, which is unsustainable from an efficiency and ecological perspective.
Innovation Solution
Incorporating means for connecting and disconnecting electrical energy, allowing for efficient use of power output by the longitudinal voltage source, and enabling coupling with other devices for power exchange through a low-voltage busbar, reducing power exchange expenditure and enabling load flow control in high-voltage direct current networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the longitudinal voltage source operates continuously to control load flow, then the DC voltage switch can effectively interrupt current and protect the network, but continuous energy losses occur making it unsustainable for long-term operation
Solution Approach 1:
The patent changes the operational parameters of the longitudinal voltage source by switching between different operating modes (continuous operation vs. standby mode). During normal operation, the longitudinal voltage source is disconnected or in standby mode with minimal energy consumption. When fault conditions are detected, it activates to provide the necessary back-EMF for current interruption. This parameter change resolves the contradiction by maintaining reliability when needed while minimizing energy losses during normal operation.
2Speed
If the longitudinal voltage source operates continuously to maintain load flow control, then the device can respond to faults immediately, but the sustained power consumption becomes ecologically unsustainable
Solution Approach 1:
The patent implements periodic action by having the longitudinal voltage source operate intermittently rather than continuously. It remains in a low-power state during normal conditions and activates periodically only when faults occur. The system monitors network conditions and triggers the longitudinal voltage source only when necessary for fault protection, thus maintaining fast fault response capability while dramatically reducing overall power consumption and ecological impact.
3Device complexity
If the power output from the longitudinal voltage source is not utilized, then the device structure remains simple, but energy waste increases over time
Solution Approach 1:
The patent applies self-service by having the longitudinal voltage source serve dual purposes: protecting against faults and providing useful power output. The energy that would otherwise be wasted is now utilized to supply connected consumers or charge energy storage systems. This eliminates energy waste while maintaining relatively simple device structure, as the same longitudinal voltage source components serve both protection and power supply functions without requiring entirely separate systems.
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
Enables efficient long-term load flow control by utilizing disconnected power for network supply or energy storage, reducing energy losses and enhancing ecological sustainability by allowing power reuse and efficient distribution across multiple branches of a DC voltage network node.
Implementation Method 1
a longitudinal voltage source for generating a back-emf in the mesh formed by permanent current path and switched current path
Data Source
AI summary
A device switches a direct current in a branch of a direct current voltage network node. The device contains a constant current path extending between two connection terminals, in which a mechanical switch is disposed. The device further has a switching current path bridging the constant current path and a power switching unit is disposed therein. The power switching unit has power semiconductor switches which can be switched on and off and configured to interrupt a short-circuit current in the event of a fault. The device contains a longitudinal voltage source for generating a counter-voltage in a loop formed by the constant current path and the switching current path. The device can be used economically over long periods of time to control the load flow on a network node. Accordingly, the longitudinal voltage source has a circuit for connecting and disconnecting the electrical power.