Communications of the ACM
Smart Electric Vehicle Charger Won't Strain the Power Grid
Engineer Michael Kintner-Meyer (foreground) and his team at PNNL developed the Smart Charger Controller to manage peak demands in the electric grid.
Pacific Northwest National Laboratory
Using a new technology developed at the U.S. Department of Energy's Pacific Northwest National Laboratory, electric vehicle owners can plug in their cars and forget about them, knowing they'll get the cheapest electricity available and won't crash the grid. The Smart Charger Controller automatically recharges electric vehicles during times of least cost to the consumer and lower demand for power. Widespread use of these devices could help advance a smart power grid.
Electric vehicles will ultimately reduce the nation's dependency on oil. While the new vehicles will serve as an additional source of power demand, they also could contribute to an even "smarter" grid if equipped with controller technology.
"If a million owners plug in their vehicles to recharge after work, it could cause a major strain on the grid," said PNNL engineer Michael Kintner-Meyer. "The Smart Charger Controller could prevent those peaks in demand from plug-in vehicles and enable our existing grid to be used more evenly."
That efficiency translates to a more stable grid and cheaper power.
"Using the device could save up to $150 a year for electric vehicle owners who pay based on when they charge their vehicle," Kintner-Meyer said.
How it Works
Electric vehicles will become widely available starting in 2011. The Obama Administration supports a goal of one million electric vehicles on the road by 2015. A previous PNNL study showed that America's existing power grid could meet the needs of about 70 percent of all U.S. light-duty vehicles if battery charging was managed to avoid new peaks in electricity demand.
The Smart Charger Controller does just that. Owners program the controller to charge at a specific time of day or night or at a set price point. The controller uses a low-range wireless technology to communicate with the power grid and determine the best and cheapest time to recharge vehicles. By charging vehicles during off-peak times, the controller saves consumers money.
Previous PNNL studies with household appliances show that "smart" technologies also save the grid from brown-outs with little impact to the consumer. Grid Friendly™ xxxxxxx technology inside the Smart Charger Controller senses stress conditions on the grid. When the grid says more power is needed, the controller can temporarily stop charging the vehicle until the stress subsides.
This instant reduction in charging load, multiplied on a large scale with many vehicles, could serve as a shock absorber for the grid. The technology would relieve load instantly and give grid operators time to bring new power generation sources on line to stabilize the grid — a process that usually takes several minutes.
The Road Ahead is Now
With more electric vehicles on the horizon, road-ready, smart charging technology can be used now, according to Kintner-Meyer. Advancing technologies like the Smart Charger Controller today will enable the new generation of electric vehicles to be "smarter" once they're available commercially, he noted.
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