Multiplex Power Converter Neutral Isolation Against Failure Spread
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Solution Overview
Problem
In multiplex power conversion systems, a short-circuit failure between direct-current positive and negative sides or neutral points in one unit power converter can cause a short-circuit current to flow between other unit power converters through the bus, potentially spreading the failure to normal units.
Innovation Solution
The system prevents neutral points from being short-circuited, ensuring that direct-current neutral points are not connected between unit power converters, thereby eliminating the flow of short-circuit current and allowing for a simple configuration to prevent failure spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If direct-current neutral points are short-circuited via bus to ensure stability in potential, then potential stability is improved, but failure may spread to other normal unit power converters
Solution Approach 1:
The invention segments the direct-current neutral points of different unit power converters, preventing them from being short-circuited together. Each unit power converter's neutral point is kept electrically isolated from others, so that a short-circuit failure in one unit cannot propagate to other units through the neutral point connection. This segmentation resolves the contradiction by maintaining potential stability within each unit while preventing failure spread between units.
2Reliability
If neutral points are not short-circuited to prevent failure spread, then reliability is improved, but potential stability may be affected
Solution Approach 1:
By segmenting and isolating the neutral points of different unit power converters, the invention prevents failure propagation while maintaining potential stability within each individual unit. The segmentation ensures that each unit operates independently regarding neutral point potential, avoiding the risk of inter-unit potential instability caused by shared connections.
3Device complexity
If neutral points are short-circuited to simplify configuration, then device complexity is reduced, but short-circuit current flows between units causing failure spread
Solution Approach 1:
The invention adopts a segmented configuration where neutral points are not short-circuited between unit power converters. This segmentation, while slightly increasing connection complexity compared to a fully shorted configuration, eliminates the harmful short-circuit current paths that would cause failure spread. The segmentation approach prioritizes reliability over minimal connection complexity.
4Reliability
If neutral points are not short-circuited to prevent short-circuit current flow, then reliability is improved, but device complexity increases
Solution Approach 1:
The segmented configuration isolating neutral points achieves reliability improvement with minimal complexity increase. Instead of requiring complex protection circuits or active control mechanisms, the invention uses a simple passive segmentation approach where neutral points are left unconnected between units. This elegant segmentation solution prevents short-circuit current flow without introducing significant complexity.
Data Source
AI summary
A multiplex power conversion system enabling preventing a failure from spreading, with a simple configuration. The multiplex power conversion system includes a plurality of unit power converters. In the plurality of unit power converters, respective direct-current positive sides are connected. Respective direct-current negative sides are connected. Respective direct-current neutral points are not short-circuited. For example, the respective direct-current neutral points are not connected. Therefore, a failure in a power converter can be prevented from spreading.