Three-to-Two Phase Transformer for High-Capacity Load Power Supply
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Solution Overview
Problem
Existing technologies for supplying high-capacity loads, such as arc furnaces and grid energy storage, face high costs due to the excessive current-carrying capacity of known modular multilevel power converters, making them impractical for single-phase high-capacity applications.
Innovation Solution
A three-to-two phase transformer apparatus with partial converters that can be connected in series or parallel, utilizing a Scott or Leblanc transformer, and equipped with semiconductor switches in full- or half-bridge circuits, to efficiently supply high-capacity loads with reduced costs and enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a three-phase modular multilevel power converter is used for high-capacity load supply, then high DC voltage generation capability is achieved, but current-carrying capacity becomes excessively high and costs increase
Solution Approach 1:
The invention divides the power conversion system into separate single-phase converter units that can be independently configured. Instead of using a single three-phase converter with excessive current capacity, the system segments the conversion function into multiple single-phase modules (first and second partial converters) that can be connected in series or parallel to match the specific voltage and current requirements of the load, thereby avoiding over-provisioning of current-carrying capacity.
Solution Approach 2:
The invention transitions from a three-phase system to a single-phase system dimension, using a three-to-two phase transformer to convert three-phase grid input into two single-phase outputs. This dimensional change allows the use of single-phase converters with appropriate current ratings instead of requiring a three-phase converter with excessively high current capacity, thus resolving the contradiction between voltage generation capability and current-carrying capacity.
2Power
If a three-phase converter is used for single-phase high-capacity loads, then power conversion capability is sufficient, but costs become prohibitive
Solution Approach 1:
The invention segments the power conversion function into separate single-phase converter units that can be manufactured and procured at lower cost than a single three-phase converter. The first and second partial converters are independent single-phase units that can be connected through the three-to-two phase transformer to achieve the required power conversion capability at reduced cost.
Solution Approach 2:
By changing from a three-phase converter architecture to a single-phase converter architecture with a three-to-two phase transformer, the system achieves equivalent or superior power conversion capability while using less expensive single-phase converter components, thereby reducing overall system cost.
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 solution provides a cost-effective and reliable power supply to high-capacity loads with high voltage or high current demands, reducing the need for expensive three-phase converters and enabling flexible configuration for various load requirements.
Implementation Method 1
a three-to-two phase transformer which comprises, on the input side, a three-phase transformer terminal for connection to a three-phase supply grid and, on the output side, a first output-side single-phase transformer terminal and a second output-side single-phase transformer terminal
Implementation Method 2
a converter arrangement having a first partial converter, which comprises a first input-side, single-phase AC voltage terminal for connection to the first output-side transformer terminal of the three-to-two phase transformer
Data Source
AI summary
An apparatus for supplying power to a high-capacity load includes a three-to-two phase transformer including an input side three-phase transformer terminal for connection to a three-phase supply grid and output side first and second output-side single-phase transformer terminals. A converter arrangement has a first partial converter including a first input-side, single-phase AC voltage terminal for the first output-side transformer terminal and a first single-phase output terminal. A second partial converter has a second input-side single-phase AC voltage terminal for the second output-side transformer terminal and a second single-phase output connector. The partial converters are mutually connectable by the output terminals in an output-side series and/or parallel circuit and form a single-phase load terminal for the high-capacity load. A method for supplying power to a high-capacity load is also provided.