Reconfigurable Transformer Converter Topology for Filterless Power Conversion
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Solution Overview
Problem
Existing AC/DC, DC/AC, and DC/DC converters used in DC transmission and distribution networks are expensive and have significant overall dimensions, limiting their spread due to the need for large filters to eliminate waveform distortions.
Innovation Solution
A converter system utilizing a three-phase transformer with reconfigurable connection modules and a control device to dynamically vary the transformation ratio, eliminating the need for filters by canceling out alternating components and maintaining direct components, thus reducing size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional AC/DC converters (LCC, VSC-PWM, VSC-MMC) are used, then power conversion function is achieved, but device dimensions and cost increase significantly
Solution Approach 1:
The converter is divided into multiple independent reconfigurable connection modules (first, second, third modules) that can be selectively connected. Each module contains switching devices that can independently configure connection topologies, allowing the system to achieve power conversion through modular reconfiguration rather than requiring a complete converter structure.
Solution Approach 2:
The converter employs dynamic reconfiguration of connection modules through switching devices (thyristors, IGBTs, or MOSFETs) that can change the circuit topology in real-time. The control device dynamically adjusts which modules are active and how they are connected, enabling the same hardware to perform different conversion functions (AC/DC, DC/AC, DC/DC) without physical reconfiguration.
2Object-generated harmful factors
If LCC converters with filters are used, then waveform distortion is eliminated, but overall dimensions and housing requirements increase
Solution Approach 1:
The invention converts the potentially harmful waveform distortions into beneficial alternating components that can be systematically canceled. By configuring reconfigurable connection modules to produce equal and opposite alternating components, the system transforms what would be harmful distortions into useful cancellation elements, eliminating the need for large filtering infrastructure.
Solution Approach 2:
The converter proactively generates counteracting alternating components through its reconfigurable modules before waveform distortions can cause harm. The control device calculates and applies opposite-phase components in advance, preventing distortion accumulation rather than requiring post-processing filters to correct them.
3Adaptability or versatility
If dynamic transformation ratio variation is used, then power factor is improved, but device complexity increases
Solution Approach 1:
The reconfigurable connection modules serve multiple functions: they enable dynamic transformation ratio variation for power factor improvement, perform AC/DC conversion, enable DC/AC conversion, and support DC/DC conversion. The same modular switching structure handles all these functions, reducing overall system complexity compared to having separate dedicated circuits for each function.
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 provides a compact and cost-effective solution with minimal waveform distortion, ensuring high-quality service without the need for large filters, and allows for adjustable output voltage and power management.
Implementation Method 1
a first primary winding (3-T), a second primary winding (3-S) and a third primary winding (3-R) which receive, respectively, a sinusoidal phase voltage
Data Source
AI summary
AC/DC converter wherein a three-phase trans former (2) comprises a plurality of first secondary windings (4-a, 4-b, . . . 4-n) magnetically linked with a first primary winding (3-T), a plurality of second secondary windings (5-a, 5-b, . . . 5-n) magnetically linked with a second primary winding (3-S) and a plurality of third secondary windings (6-a, 6-b, . . . 6-n) magnetically linked with a third primary winding (3-R). There is provided a plurality of first, second and third reconfigurable connection modules each of which is respectively connected on the input side with a first, a second and a third secondary winding; the outputs of the first reconfigurable connection modules being connected in series to one another, the outputs of the second reconfigurable connection modules being connected in series to one another and the outputs of the third reconfigurable connection modules are connected in series to one another. Each reconfigurable module comprises electronic switches selectively controllable so that three connections can be made, including a direct connection, wherein the voltage supplied at the input of the reconfigurable connection module is transferred to its output with the same polarity, a bypass connection, wherein the output of the re configurable connection module is short-circuited and the output voltage at the module is substantially equal to zero, and a reverse connection, wherein the voltage supplied at the input of the re configurable connection module is transferred to its output with reversed polarity.