Solid-State Transformer DC Distribution With Independent Current Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power distribution systems face inefficiencies in distributing AC power to multiple loads, requiring complex equipment like PFC and harmonic-filter circuits, and DC power distribution lacks independent current control for series-connected loads.
Innovation Solution
A power system utilizing series-connected primary and secondary converters, including solid-state transformers, with optional secondary converters for current balancing, allows for independent current control and simplified voltage control, reducing the need for complex AC distribution equipment and enabling current sharing between load legs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If AC power is distributed to multiple loads using conventional equipment, then power distribution is achieved, but system complexity increases due to required PFC and harmonic-filter circuits
Solution Approach 1:
The patent changes the fundamental parameter of power distribution from AC to DC, eliminating the need for PFC and harmonic-filter circuits that are only required in AC systems. This parameter change resolves the contradiction by simplifying the distribution equipment while maintaining or improving power distribution efficiency through direct DC delivery to loads.
Solution Approach 2:
The invention extracts and removes the unnecessary PFC and harmonic-filter circuits from the power distribution system by transitioning to DC distribution. These components are taken out of the system entirely, reducing equipment complexity while preserving the core function of power delivery to multiple loads.
2Ease of operation
If DC power is distributed to series-connected loads, then power delivery is achieved, but independent current control for each load is lost
Solution Approach 1:
The patent segments the DC power distribution system into multiple parallel converter units, each equipped with its own current control mechanism. This segmentation allows independent current control for each load while maintaining the overall DC distribution architecture, resolving the contradiction between ease of operation and device complexity.
Solution Approach 2:
The invention introduces controllable converter units as intermediary devices between the DC power source and the loads. These converters act as mediators that can independently regulate current to each load while operating in a series-connected configuration, enabling independent current control without excessive system complexity.
3Device complexity
If series-connected converters are used for DC distribution, then voltage control is simplified, but current balancing between legs becomes challenging
Solution Approach 1:
The patent implements feedback control mechanisms in the converter units that monitor current distribution across parallel legs and automatically adjust operating parameters to achieve current balancing. This feedback system resolves the contradiction by maintaining simplified voltage control while actively managing current balancing to optimize system productivity.
Solution Approach 2:
The invention employs dynamic current sharing mechanisms where the converter units can dynamically adjust their operating points based on real-time load conditions. This dynamic behavior enables automatic current balancing between parallel legs while preserving the simplicity of series-connected voltage control, thereby resolving the contradiction between device complexity and productivity.
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
The system achieves efficient DC power distribution with simplified voltage control, reduced equipment complexity, and independent current management for series-connected loads, enhancing reliability and flexibility.
Implementation Method 1
providing, by each secondary winding of the plurality of secondary windings, a respective induced DC current to one or more respective loads, each induced DC current being induced by the primary DC current
Data Source
AI summary
Examples of the disclosure include a power system comprising a plurality of converters configured to receive DC power, the plurality of converters including a plurality of primary windings and a plurality of secondary windings, wherein each primary winding of the plurality of primary windings is coupled in series, and each secondary winding of the plurality of secondary windings is configured to be coupled to at least one load.