Longitudinal Voltage Source H-Bridge Electrical Isolation
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Solution Overview
Problem
Existing longitudinal voltage sources for direct current transmission systems lack the ability to achieve complete electrical isolation between H-bridge circuits, limiting their cascading and series connection capabilities, and are not cost-effective due to excessive component counts.
Innovation Solution
Incorporating four switching modules between the capacitor terminals and output terminals of H-bridge circuits allows for complete electrical isolation, enabling cascading and series connection of longitudinal voltage sources while maintaining a low component count, using identical switching modules capable of bidirectional switching and blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switching modules are added between capacitor terminals and H-bridge output terminals to achieve complete electrical isolation, then cascading capability and dielectric strength are improved, but device complexity increases
Solution Approach 1:
The patent divides the longitudinal voltage source into modular H-bridge circuits, each with independent switching modules between capacitor terminals and output terminals. This segmentation enables complete electrical isolation between H-bridge circuits while maintaining a manageable component count through standardized modular design.
2Adaptability or versatility
If four switching modules are provided for complete electrical isolation of H-bridge circuits, then cascading capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs identical switching modules for all four connections between capacitor terminals and H-bridge output terminals. These universal switching modules perform multiple functions including isolation, cascading enablement, and bidirectional switching, thereby reducing manufacturing costs through standardization despite the increased component count.
3Device complexity
If identical switching modules capable of bidirectional switching are used, then device complexity is reduced through standardization, but switching capability requirements increase
Solution Approach 1:
The patent uses identical switching modules throughout the circuit, ensuring homogeneous design that simplifies manufacturing and maintenance. Each switching module is designed to handle bidirectional switching and blocking requirements, meeting enhanced capability demands through standardized component specification rather than diverse component types.
Data Source
AI summary
A longitudinal voltage source interconnects into a first line and a second line and feeds a longitudinal voltage into each of the two lines. The voltage source has first and second H-bridge circuits, each with four switches, and with outer terminals and center terminals. The center terminals are connectable to disconnected locations of the first and second lines. A capacitor has a first capacitor terminal connected to the two first output terminals of the two H-bridge circuits and a second capacitor terminal connected to the two second output terminals of the two H-bridge circuits. One or more switching modules are connected between the first capacitor terminal and the first output terminals of the first and second H-bridge circuits, and one or more switching modules are connected between the second capacitor terminal and the second output terminals of the first and second H-bridge circuits.