Converter Valve Cell Layout for Compact High-Voltage Spacing
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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 arrangement of converter cells into equal groups in parallel planes with a common voltage difference and their shortest dimension perpendicular to the plane, connected in series both within and between groups, reduces the risk of electrical arcing and optimizes spatial arrangement, allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If converter cells are arranged in traditional configurations, then the valve assembly can be constructed, but the voltage difference between spatially adjacent components increases, leading to higher risk of electrical arcing
Solution Approach 1:
The patent applies equipotentiality by arranging converter cells in parallel planes such that spatially adjacent cells have equal or equalized voltage differences. This is achieved by connecting cells in series within each plane and arranging planes such that corresponding cells in adjacent planes have matching voltage potentials, thereby minimizing voltage differentials between neighboring components and reducing electrical arcing risk.
Solution Approach 2:
The patent transitions from traditional linear or planar arrangements to a three-dimensional configuration with multiple parallel planes stacked along an axis. By organizing converter cells across multiple spatial dimensions (planes stacked in sequence), the invention achieves better voltage distribution while maintaining compact form factor, resolving the contradiction between reliability and complexity.
2Volume of stationary object
If converter cells are placed closer together to reduce valve hall volume, then space utilization improves, but the risk of electrical arcing increases due to higher voltage differences between adjacent cells
Solution Approach 1:
By equalizing voltage differences between spatially adjacent converter cells through the parallel plane arrangement, the patent enables cells to be placed closer together without increasing arcing risk. The equipotential design ensures that even at reduced spacing, the voltage differential between neighboring cells remains minimal, allowing compact construction while maintaining safety.
Solution Approach 2:
The patent introduces intermediate insulating structures and support frameworks that facilitate close spacing of converter cell planes while maintaining electrical isolation. These intermediary elements enable the compact three-dimensional arrangement by providing structural support and electrical insulation, allowing reduced volume without compromising reliability.
3Ease of manufacture
If non-uniform voltage distribution is accepted in traditional arrangements, then construction is simpler, but electrical arcing risk increases and space utilization decreases
Solution Approach 1:
The patent segments the converter cell assembly into multiple parallel planes, each containing a subset of cells connected in series. This segmentation allows independent arrangement of each plane to achieve uniform voltage distribution across spatially adjacent cells, while the modular nature of the segmentation maintains manufacturing simplicity. Each plane can be constructed and tested independently before assembly into the complete three-dimensional structure.
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 an axis (8). Converter cells (3a-j) in a group (6a) are connected in series and arranged with their shortest dimension perpendicular to the plane (7a), 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.