Exploring the Technology Behind IIT’s Microgrid

For more than a hundred years the basic architecture of our electrical grid has remained largely unchanged. Big centralized power stations, normally located outside of a city, supplying electricity to homes and businesses via transmission stations, substations and power cables.

But that model of power distribution is changing.

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New technology is enabling the use of power in smarter, more efficient ways, helping manage the load as increased demand puts more stress on the grid.

One way is by creating so-called microgrids – small, independent power grids that may be connected to the main grid but which in an emergency can operate independent of it.

In Chicago, one place with a fully-operational microgrid is on the campus of the Illinois Institute of Technology.

“At IIT when we built this system the primary reason was reliability,” said Dr. Mohammad Shahidehpour, director of the Robert W. Galvin Center for Electricity Innovation IIT and a specialist in creating and managing power systems, including microgrids. “Before we had this microgrid we spent quite a bit of time and money – energy basically – managing outages.”

Using a model of the university campus, Shahidepour explains the layout of IIT’s microgrid which it first began developing in 2008.

“What you see on the east side of the Green Line is mainly residential areas for students, faculty. And what you see on the northwestern part of the campus is primarily classrooms and down here is where I’m standing on the south side of the campus is a lot of research and a lot of operations,” he said.

Different colors denote different minigrids – or loops – that have their own source of power generation matched to particular needs. Purple are student residences that consume the most power in the evenings. Red and orange are classrooms that need power during the day. Blue, green and yellow are research facilities that need power 24/7.

That power comes from rooftop solar panels and wind turbines, and is stored in banks of batteries distributed around campus. Although IIT’s microgrid cannot supply all of the campus’s needs year round, it does supply most of them – generating roughly two-thirds of IIT’s peak summertime demand.

Shahidepour notes that in one sense, this is old technology.

“The first microgrid was basically built in 1881 when Edison built the first generating plant in the southern part of Manhattan,” he said. “That was a microgrid because there was no grid at that time. So he was basically the first one, so microgrids have been around – but the difference is that what we are building now is smart microgrid where you are utilizing a lot of sensors and telecommunication technologies in order to come up with smart decisions.”

And that smart technology can also save money. Batteries are charged from solar panels, wind turbines or from the main grid at off-peak hours – and then that power can be used as needed.

While microgrids can be extremely sophisticated and expensive, they don’t have to be, says Shahidepour.

“It’s like you can buy a very inexpensive car and you can buy an expensive car with lots of gadgets. It’s the same thing with a microgrid. If you want to have lots of loops and lots of sensors and a significant level of control, then the costs are going to add up,” he said. “If you want something very basic, in a sense the project that we are doing currently in third world countries are extremely inexpensive. Because we just go to the base. Everything is very simple in order for those people to afford it.”

Commonwealth Edison is certainly interested in exploring microgrid technology and has been collaborating with IIT. It hopes to build a microgrid in the neighboring Bronzeville community that will connect to IIT’s grid.

Joseph Svachula, vice president of engineering and smartgrid at ComEd, says the utility is interested in how microgrids could be used to make our electrical infrastructure more resilient to weather events or even terrorist attack.

“We are hopeful to do a demonstration of a microgrid to prove the reliability benefits and the resiliency benefits,” Svachula said. “What’s emerging around the country these days are threats that are not only weather, but physical threats. Cyber threats.”

Initially, microgrids could be used to power critical infrastructure but could eventually supply a community’s power needs more broadly, according to Svachula. There is, he says, a new paradigm emerging.

“I think the journey starts with big public purpose, critical infrastructure. I think we start there,” he said. “And I think eventually it finds its way into communities. I don’t think it covers every home in the service territory, but it may start to cover the business districts of small communities. Perhaps, their fire and rescue departments, etc. – the governmental institutions.”

He notes that in a place such as Puerto Rico, which is still largely without power after the devastation wrought by Hurricane Maria, microgrids could, in the future, make a big difference.

“If you look to Puerto Rico, one of the problems that they are dealing with is that they’ve got to build their grid all the way back to the centralized generation … which is why it is taking so long,” he said. “With the microgrid, you may sustain some local damage, I think that is a fair assumption, but you maybe only have to rebuild maybe a few panels and switches – but localized. You would basically have that island up and running pretty quickly.”

In addition to added resilience and reliability, microgrids may also pave the way for a greener energy future, Shahidepour says.

“Just putting solar in individual homes may be a near term solution, but as you go on and build more massive types of installations of renewable energy, definitely putting together a cluster like this where you can utilize everything that is nearby, including renewable energy is going to be the way of the future,” he said.

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