Converter Valve Cell Layout for Compact Arc-Resistant Assembly
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Solution Overview
Problem
Converter valve assemblies in power grid systems face challenges in optimizing the arrangement of converter cells to minimize voltage differences and reduce the risk of electrical arcing, particularly in high-voltage applications like offshore wind installations, where space is limited and costly.
Innovation Solution
The converter valve assembly is arranged with two or more equal groups of prismatic converter cells in parallel planes, connected in series, with a uniform voltage difference between adjacent cells, allowing for closer spacing and reduced overall volume, and includes a support structure to mitigate seismic risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If converter cells are arranged in a conventional configuration, then the valve assembly can be constructed, but the voltage difference between spatially adjacent converter cells is large, increasing the risk of electrical arcing
Solution Approach 1:
The patent transitions from conventional linear or planar arrangements to a three-dimensional spatial configuration where converter cells are positioned at vertices of a polyhedron. This dimensional change allows optimization of voltage difference distribution in multiple spatial directions simultaneously, reducing maximum voltage differences between adjacent cells while maintaining compact overall volume.
Solution Approach 2:
The patent systematically varies the spatial parameters (positions and orientations) of converter cells within the polyhedral structure to achieve uniform voltage difference distribution. By adjusting geometric parameters of the arrangement, the design optimizes the voltage potential landscape to minimize arcing risk without increasing volume.
2Volume of stationary object
If converter cells are placed closer together to reduce volume, then the overall volume of the valve assembly is reduced, but the voltage difference between adjacent cells increases, raising the risk of electrical arcing
Solution Approach 1:
By utilizing three-dimensional polyhedral geometry, the patent achieves compact cell spacing in all directions while maintaining adequate voltage clearance through strategic positioning. The polyhedral structure allows cells to be closer in volume-critical directions while preserving safety margins in voltage-stress directions.
Solution Approach 2:
The patent arranges converter cells to create a more uniform voltage potential distribution throughout the assembly. By positioning cells at polyhedral vertices and optimizing their configuration, the design equalizes voltage differences between adjacent cells, preventing localized high-stress regions that would necessitate larger spacing.
3Reliability
If converter cells are arranged to minimize voltage difference between adjacent cells, then the risk of electrical arcing is reduced, but the arrangement complexity increases
Solution Approach 1:
The patent divides the converter cell assembly into modular polyhedral units with standardized vertex configurations. This segmentation allows complex voltage-optimized arrangements to be constructed from repeating geometric modules, simplifying the overall design and fabrication process while maintaining the voltage-difference minimization benefits.
Solution Approach 2:
The patent employs a composite structural approach, combining the functional converter cells with a geometric framework (polyhedral structure) that provides both mechanical support and voltage optimization. This composite design separates the electrical function from the spatial optimization function, making the complex arrangement more manageable and manufacturable.
Data Source
AI summary
There is disclosed herein a converter valve assembly (20) for a power grid system, comprising two or more equal groups (6a, 6b, 6c) of prismatic converter cells (3a-ad), each group (6a, 6b, 6c) being arranged in a respective plane (7a, 7b, 7c) of a plurality of parallel planes spaced apart along a horizontal axis (8). Converter cells (3a-j) in a group (6a) are connected in series, and the groups (6a, 6b, 6c) are connected in series along the axis (8). The prismatic converter cells (3a-j) in a group (6a) are arranged such that there is a corresponding voltage difference between each converter cell (3a-j) in the group (6a) and each corresponding converter cell (3k-t) in an adjacent group (6b) that is a spatially nearest to said each converter cell (3a-j), during operation of the converter valve assembly (20). Therefore, a spacing between groups may be reduced and an overall volume of the converter valve assembly may be reduced.