Timon Singh

Power Grid To Struggle With Off-Peak Renewable Energy Demand?

by , 08/04/11

MIT smart grid, MIT renewable energy power grid, renewable energy power grid, smart grid overload, off peak energy demand

One major concern for many countries has been how to make their existing power grids ‘smarter’ so that they are more compatible with renewable forms of energy. However a report from MIT has stated that despite the increase in ‘smart meters’ (that allow people to see electricity cost fluctuations in real-time), a rise in demand could overload the power grid.

MIT smart grid, MIT renewable energy power grid, renewable energy power grid, smart grid overload, off peak energy demand

How might this happen you ask? Well if you were to wait until late at night to charge your phone or to do the laundry, then it is possible others will do the same. During this ‘off peak’ period, these energy-intensive tasks would not use renewable sources of energy such as wind and solar, but instead fire up backup generators.

According to the MIT researchers, this swing in demand could overload the power grid causing it to crash. And Despite the fact that many customers receive energy bills quarterly or every six months, utilities costs are constantly fluctuating. However, price varies according to demand, not demand varying according to price. Smart meters would and could change that, changing the dynamics of the system.

Lead MIT research scientist Mardavij Roozbehani and professors Sanjoy Mitter and Munther Dahleh believe that most consumers have a “utility function” which is a period when it is simply inconvenient for them to defer electricity usage.

The researchers assumed that on average, consumers will seek to maximize the difference between the utility function and the cost of electricity, however this will cause dangerous oscillations in demand.

“For the system to work, supply and demand must match almost perfectly at each instant of time,” Roozbehani says. “The generators have what are called ramp constraints: They cannot ramp up their production arbitrarily fast, and they cannot ramp it down arbitrarily fast. If these oscillations become very wild, they’ll have a hard time keeping track of the demand. And that’s bad for everyone.”

So what’s the solution?

“As far as I know, very, very few people are analyzing the dynamics of electricity markets with experience from control theory,” says Eugene Litvinov, senior director of business architecture and technology at ISO New England, the organization that oversees the operation of the electrical grid in the six New England states. “I think we should encourage these kinds of studies, because regulatory bodies and government are pushing for certain things, and they don’t realize how far they can push. For example, they want to have 30 percent wind penetration by 2020, or something like this, but that could cause serious issues for the grid. Without that kind of analysis, the operators would be very uncomfortable just jumping over the cliff.”

Oh great. There isn’t one.

+ MIT

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