
GE Research’s innovative gas discharge tube technology that is being applied to develop the MVDC circuit breaker.
“Many big urban cities today are facing higher electricity demands because of growing applications such as electric vehicle charging, with limited options for tapping into new energy sources,” said Timothy Sommerer, Principal Scientist at GE Research and Principal Investigator on the MVDC program. “By upgrading existing AC distributions grids to MVDC grids, it would allow these cities to cast a much wider net in securing new clean renewable energy sources.”
“The new super-fast DC circuit breaker we’re developing is an essential component for enabling the distribution grid upgrade from AC to MVDC,” added Sommerer. “Because DC doesn’t inherently contain natural breaks like AC that help manage faults, you need to have a switch with an extremely fast response time that can create these breaks. That’s exactly the challenge GE’s technology will address.”
The MVDC distribution lines envisioned will support up to 100,000 volts and more than 100 megawatts of power to meet the needs of large cities. The land area required to power a city by renewable sources like wind, solar, and hydro is 3 to 10 times larger than the city itself and is usually some distance from the city. At the same time electric urban power demand is increasing as vehicles and other fuel-burning power users go electric.
In general, the increasing use of DC current in electricity transmission has the potential to greatly expand where utilities can draw power from to meet their energy needs in two important ways. First, electric power can move more efficiently over long distances on high-voltage DC lines vs. AC. And second, an MVDC distribution grid can then take that HVDC power and distribute it more efficiently and effectively into a large urban area.
“The development of DC grid technologies could vastly increase the flexibility utilities have in addressing future power needs,” said Sommerer. “Imagine the day when cities like New York, Chicago, or Los Angeles have the option of accessing electricity from multiple wind installations in the Midwest to meet electric vehicle charging needs.”
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