Featured Research

from universities, journals, and other organizations

Improved synchronicity: Preventive care for the power grid

Date:
March 2, 2013
Source:
Northwestern University
Summary:
As the U.S. national power-grid network becomes larger and more complex, achieving reliability across the network is increasingly difficult. Now scientists have identified conditions and properties that power companies can consider using to keep power generators in the desired synchronized state. The design could help reduce both the frequency of blackouts and the cost of electricity as well as offer an improved plan for handling the intermittent power sources of renewable energy, which can destabilize the network.

President Obama in this year's State of the Union address talked about the future of energy and mentioned "self-healing power grids" -- a grid that is able to keep itself stable during normal conditions and also to self-recover in the event of a disturbance caused, for example, by severe weather.

But as the national power-grid network becomes larger and more complex achieving reliability across the network is increasingly difficult. Now Northwestern University scientists have identified conditions and properties that power companies can consider using to keep power generators in the desired synchronized state and help make a self-healing power grid a reality.

The Northwestern team's design for a better power grid could help reduce both the frequency of blackouts and the cost of electricity as well as offer an improved plan for handling the intermittent power sources of renewable energy, such as solar and wind power, which can destabilize the network.

"We will be looking at a completely different power grid in the future," said Adilson E. Motter, who led the research. "The use of renewable energy is growing. More people will be driving electric cars, and the power grid will be delivering this energy, not gas stations. We need a power grid that is more capable and more reliable. This requires a better understanding of the current power grid as well as new ways to stabilize it."

Motter is the Harold H. and Virginia Anderson Professor of Physics and Astronomy at Northwestern's Weinberg College of Arts and Sciences.

The crux of the challenge is that for the U.S. power grid to function the power generators in each of its three interconnections (Eastern, Western and Texas) must be synchronized, all operating at the frequency of 60 hertz. Out-of-synch power generators can lead to blackouts that affect millions of people and cost billions of dollars -- losses similar to those of the Northeast blackout of 2003.

Having a network that can synchronize spontaneously and recover from failures in real time -- in other words, a self-healing power grid -- could prevent such blackouts. To help achieve this, power companies could apply the Northwestern guidelines as they add power generators to the network or tweak existing generators.

A paper describing the researchers' mathematical model, titled "Spontaneous synchrony in power-grid networks," is published in the March 2013 issue of the journal Nature Physics.

When a problem develops in the power-grid network, control devices are used to return power generators to a synchronized state. Motter likens this to using medicine to treat someone who is ill. He and his colleagues are suggesting conditions to keep synchronicity in good shape so interventions are kept to a minimum.

"Our approach is preventive care -- preventing failures instead of mitigating them," said Motter, an author of the paper and an executive committee member of the Northwestern Institute on Complex Systems (NICO). "The guidelines we offer could be very useful as the power grid expands."

The researchers derived a condition under which the desired synchronous state of a power grid is stable. They then used this condition to identify tunable parameters of the power generators that result in spontaneous synchronization. This synchronization can be autonomous, not guided by control devices.

"The blackout at this year's Super Bowl was caused by a device that was installed specifically to prevent blackouts," said Takashi Nishikawa, an author of the paper and a research associate professor of physics and astronomy at Northwestern. "A large fraction of blackouts have human and equipment errors among the causes.

"Reduced dependence on conventional control devices can improve the reliability of the grid," he said. "Our analysis also suggests ways to design control strategies that potentially can improve the existing ones."

Power generators are very different from each other; some are large and others small. Motter and his colleagues identified a "body mass index" for power generators, which they suggest should be kept approximately the same (making, in essence, all generators look the same to the network) in order to strengthen spontaneous synchronicity in the system. If the body mass indices change, they should be changed in a coordinated way.

The researchers demonstrated their model using real power grids of hundreds of power generators, similar to the size of the Texas portion of the U.S. power grid.


Story Source:

The above story is based on materials provided by Northwestern University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Adilson E. Motter, Seth A. Myers, Marian Anghel, Takashi Nishikawa. Spontaneous synchrony in power-grid networks. Nature Physics, 2013; 9 (3): 191 DOI: 10.1038/nphys2535

Cite This Page:

Northwestern University. "Improved synchronicity: Preventive care for the power grid." ScienceDaily. ScienceDaily, 2 March 2013. <www.sciencedaily.com/releases/2013/03/130302125404.htm>.
Northwestern University. (2013, March 2). Improved synchronicity: Preventive care for the power grid. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2013/03/130302125404.htm
Northwestern University. "Improved synchronicity: Preventive care for the power grid." ScienceDaily. www.sciencedaily.com/releases/2013/03/130302125404.htm (accessed July 22, 2014).

Share This




More Matter & Energy News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Government Approves East Coast Oil Exploration

Government Approves East Coast Oil Exploration

AP (July 18, 2014) The Obama administration approved the use of sonic cannons to discover deposits under the ocean floor by shooting sound waves 100 times louder than a jet engine through waters shared by endangered whales and turtles. (July 18) Video provided by AP
Powered by NewsLook.com
Sunken German U-Boat Clearly Visible For First Time

Sunken German U-Boat Clearly Visible For First Time

Newsy (July 18, 2014) The wreckage of the German submarine U-166 has become clearly visible for the first time since it was discovered in 2001. Video provided by Newsy
Powered by NewsLook.com
Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Reuters - US Online Video (July 17, 2014) President Barak Obama stopped by at a lunch counter in Delaware before making remarks about boosting the nation's infrastructure. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

TheStreet (July 16, 2014) Oil Futures are bouncing back after tumbling below $100 a barrel for the first time since May yesterday. Jeff Grossman is the president of BRG Brokerage and trades at the NYMEX. Grossman tells TheStreet the Middle East is always a concern for oil traders. Oil prices were pushed down in recent weeks on Libya increasing its production. Supply disruptions in Iraq fading also contributed to prices falling. News from China's economic front showing a growth for the second quarter also calmed fears on its slowdown. Jeff Grossman talks to TheStreet's Susannah Lee on this and more on the Energy Department's Energy Information Administration (EIA) report. Video provided by TheStreet
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins