Power distribution systems have changed little in recent decades. From generating set, to national grid, to substation, to local distribution to industry and domestic, there exist several stages of voltage / current transformation, tap changers and circuit breakers. Such transformers have substantially remained unchanged since invented by Michael Faraday in 1831, comprising copper wire wound on a magnetic iron core. Similarly the circuit breakers and tap changes are also archaic relying on electromechanical arrangements. Such means are bulky, heavy and difficult to control with limited sophistication in use.
The Technology
In a patented topology using MOS gate switching devices and low loss high frequency ferrite cored transformer and inductor designs combined with programmable microcontroller, the problems of bulk and weight are addressed whilst adding the benefits of controllable and programmable performance.
The “Bi-Directional Cuk Converter” topology mimics conventional iron / copper transformers in electrical performance with reactive loads whilst allowing ultra fast short circuit / earth fault protection.
The programmable micro controller also allows for point on wave control of voltage / current transformation ratio, harmonic correction, wattless synchronizing, zero crossing turn on / off etc.
Stackable series or parallel modules allow for high voltage and / or high currents.
It is envisaged that the technology disclosed might be used for applications from <1kVA to >500kVA in a single stage module at >2kV >250A with presently available power semiconductor technology.
See: http://www.pi.hitachi.co.jp/ps/images/pdf/IGBT/MBN600H65E.pdf
By arranging the modules in parallel or series or combinations of series parallel it is possible to realise substantially higher kVA ratings per phase.
The single phase modules or combinations of serial / parallel modules may be connected as 3 phase transformer systems in delta or star configurations.
The modules may be designed with or without galvanic isolation.
Switching on or off of the output may be accomplished electronically thus reducing the need for switchgear and problems and cost associated with high voltage electromechanical circuit breakers.
Technology Extrapolation
Development of communication protocol etc. to enable control and optimization of large grid systems with programmed fault detect, disconnect clearance and reconnect strategy.
Key Benefits
Include:
- Fault detection and disconnection
- Automatic voltage control (tighter voltage regulation)
- Smaller footprint
- Lighter weight (for e.g. rural distribution, pole mounting).
Intellectual Property
The technology is protected by patents in a number of territories worldwide, including the US, Europe, Japan, South Korea and India.
Opportunity
Licenses are available for suitable partners to develop and market the technology worldwide.