Capacitive Step-Wise Voltage Transformation by Resonant Charge Exchange
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Solution Overview
Problem
Magnetically-based AC transformers are inefficient in handling long-distance power transmission due to high costs, toxicity of insulating oil, and limited potential for advancements, while high voltage DC systems require a DC equivalent of transformers for network operation, which is not cost-effective without suitable high voltage DC circuit breakers.
Innovation Solution
A high-speed, three-step process using series-connected capacitors for resonant energy exchange between electrical nodes, allowing for modular, redundant, and phase-shifting capabilities, replacing traditional transformers with a controller managing capacitor configurations for efficient voltage transformation between nodes differing in frequency and waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetically-based AC transformers are used for voltage transformation, then voltage conversion between transmission and distribution systems is achieved, but the system suffers from high costs, toxicity of insulating oil, and limited potential for further advancements
Solution Approach 1:
The patent replaces the magnetic field-based transformation mechanism with an electrostatic field-based capacitive system. The mechanical/electromagnetic transformer core and windings are substituted with capacitive modules arranged in series strings, eliminating the need for magnetic materials and toxic insulating oil while achieving the same voltage transformation function through electrostatic energy storage and release.
Solution Approach 2:
The patent changes the fundamental operating parameter from magnetic flux variation to capacitive voltage division. By using capacitors with specific capacitance values arranged in series, the system achieves voltage transformation through static electric field energy storage rather than dynamic magnetic field induction, thereby eliminating toxic materials while maintaining transformation functionality.
2Reliability
If magnetically-based transformers are used, then voltage transformation is achieved, but long delivery lead time requires spare transformers to be readily available on site
Solution Approach 1:
The patent divides the transformer into multiple independent capacitive modules that can be manufactured separately and assembled on-site. Each capacitive module is a discrete unit that can be independently produced, tested, and replaced, eliminating the need for long lead times associated with manufacturing complete magnetic transformers. This modular segmentation enables rapid deployment and easy replacement without requiring spare entire-transformer units.
Solution Approach 2:
The patent introduces dynamic reconfigurability through switching devices that can rapidly rearrange the capacitive modules between series and parallel configurations. This dynamic switching capability allows the system to adapt its voltage transformation ratio in real-time and provides flexible redundancy management, where individual modules can be taken out of service for maintenance without shutting down the entire system, thereby ensuring continuous power supply.
3Productivity
If traditional AC transformers are used, then power transmission is efficient, but there is little promise of further advances due to mature technology
Solution Approach 1:
The patent creates a universal voltage transformation system that can operate in multiple modes: AC-to-AC transformation, DC-to-DC transformation, and AC-to-DC conversion. The same capacitive module architecture supports different transformation ratios by simply reconfiguring the series/parallel arrangements, providing adaptability for various power system applications including renewable energy integration, electric vehicle charging, and grid modernization initiatives.
Solution Approach 2:
The patent implements dynamic control through electronic switching devices that can rapidly reconfigure the capacitive network in response to changing load conditions and voltage requirements. This dynamic adaptability allows real-time optimization of transmission efficiency and enables the system to accommodate variable frequency and voltage conditions, providing a platform for future smart grid applications and advanced power electronics integration.
4Productivity
If high voltage DC systems are used for long-distance transmission, then low-cost towers and controlled power flow are achieved, but DC equivalent transformers are not cost-effective without suitable high voltage DC circuit breakers
Solution Approach 1:
The patent segments the DC transformer into modular capacitive units that can be independently controlled and protected. Each module contains its own switching devices and can be isolated through circuit breakers designed for lower voltage ratings, avoiding the need for expensive high-voltage DC circuit breakers. The modular architecture allows the system to achieve long-distance transmission capability through series connection of modules while maintaining manageable complexity through parallel protection schemes.
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
This solution eliminates the need for spare transformers, avoids toxic oils, simplifies manufacturing, and enables frequency and waveform conversion, providing internal redundancy and inherent phase shifting, thus improving the efficiency and cost-effectiveness of power transmission.
Implementation Method 1
a first resonant half-cycle exchange of energy between a first voltage node and a column of series-connected capacitors
Implementation Method 2
a column of series-connected capacitors
Data Source
AI summary
A system for transforming the voltage of AC electrical energy by resonant charge exchange between a first node and a second node. The system includes a capacitor or series-connected column of capacitors and a controller that is configured to cause the system to repetitively conduct a primary charge exchange by resonantly exchanging energy between the capacitor or the series-connected column of capacitors and the first node, and then electrically isolate the capacitor or the series-connected column of capacitors. During the electrical isolation the system can electrically reconfigure the series-connected column of capacitors. The system then conducts a secondary charge exchange by resonantly exchanging energy between the capacitor or the reconfigured series-connected column of capacitors and the second node.