With over 6,000 plants transmitting electricity to homes and businesses across the country via 600,000 miles of power lines, today’s power grid can be thought of as the world’s largest single machine.
Credit: NASA Earth Observatory/NOAA NGDC
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The unmatched ability of the human brain to process and make sense of large amounts of complex data has caught the attention of engineers working in the field of control systems.
"The brain is one of the most robust computational platforms that exists," says Ganesh Kumar Venayagamoorthy, Ph.D., director of the Real-Time Power and Intelligent Systems Laboratory at Clemson University. "As power-systems control becomes more and more complex, it makes sense to look to the brain as a model for how to deal with all of the complexity and the uncertainty that exists."
Led by Venayagamoorthy, a team of neuroscientists and engineers is using neurons grown in a dish to control simulated power grids. The researchers hope that studying how neural networks integrate and respond to complex information will inspire new methods for managing the country's ever-changing power supply and demand.
In other words, the brainpower behind our future electric power grid might not be what you think.
Power to the people
America's strategy for providing power began in the late 1800s as a number of isolated generating plants serving regional customers. Over the next 50 years, the electric system was rapidly transformed into an inter-connected "grid" that ensured access to power when equipment failed or during periods of unexpected demand.
Today, with nearly 200,000 miles of high-voltage lines connecting over 6,000 power plants, America's power grid has been called the world's largest single machine.
Unfortunately, the grid's aging infrastructure wasn't built to handle today's ever-increasing demand. According to the U.S. Department of Energy, the average power generating station in the United States was built in the 1960s, using even older technology. Today, the average substation transformer is 42 years old, two years past its expected life span.
Another problem is that while the system has a great capacity to produce power, it doesn't actually have a way to store power.
This can spell trouble during periods of unexpected high demand, which can result in a massive loss (blackout) or reduction (brownout) in electricity. In 2003, 50 million people in 8 states and 1 Canadian province were left without power when a single transmission line in Ohio was damaged by a tree limb.
Tomorrow's power grid will need to be able to anticipate usage and quickly compensate for unexpected need.
The "on-demand" power production strategy of our current system also makes it difficult to incorporate renewable sources of energy, such as wind and solar power, which can't be cranked up or down in response to peaks and lulls in power consumption.
"In order to get the most out of the different types of renewable energy sources, we need an intelligent grid that can perform real-time dispatch and manage optimally available energy storage systems," says Venayagamoorthy.
A smarter electric power grid
While technologies such as solar panels, wind turbines and hybrid electric vehicles will help reduce our non-renewable energy consumption, experts believe the development of a "smart" grid, capable of monitoring and controlling the flow of electricity from power plants down to individual appliances, will have the largest impact.
According to the Department of Energy, if the current grid were just 5 percent more efficient, the energy savings would be equal to removing 53 million cars from the planet.
While a number of strategies have been proposed to optimize grid performance and incorporate intermittent energy sources, the ultimate goal is to create a distributed energy delivery network characterized by a two-way flow of electricity and information.
For Venayagamoorthy, looking to the brain for inspiration was a no-brainer.
"What we need is a system that can monitor, forecast, plan, learn, make decisions," says Venayagamoorthy. "Ultimately, what we need is a control system that is very brain-like."
What would the brain do?
Because the brain operates in a completely different way than traditional computing systems, the first step was to try to make sense of how the brain integrates and responds to data. To do so, Venayagamoorthy enlisted the expertise of neuroscientist Steve Potter, Ph.D., director of the Laboratory for NeuroEngineering at the Georgia Institute of Technology.
A leader in the field of learning and memory research, Potter recently pioneered a new method for understanding how the brain integrates and responds to information at the network level. The technique involves growing neurons in a dish containing a grid of electrodes that can both stimulate and record activity. The electrodes connect the neuronal network to a computer, allowing two-way communication between the living and the electronic components.
Potter's group has had success with this approach in the past, having shown that living neuronal networks can be made to control computer-simulated animals and simple robots.
In the current project, the network is trained to recognize and respond to voltage and speed signals from Venayagamoorthy's power grid simulation.
"The goal is to translate the physical and functional changes that occur as living neuronal network learns into mathematical equations, ultimately leading to a more brain-like intelligent control system," says Venayagamoorthy.
The purpose is to develop brain-inspired computer code, meaning living brain cells won't be part of the final equation.
What have we learned so far?
The collaboration has already yielded encouraging results.
The investigators have successfully "taught" a living neuronal network how to respond to complex data, and have incorporated these findings into simulated versions called bio-inspired artificial neural networks (BIANNS). They are currently using the new and improved BIANNS to control synchronous generators connected to a power system.
Venayagamoorthy and his team hope that this work will pave the way for smarter control of our future power grid.
For more information about this project, check out brain2grid.org.
Editor's Note: The research depicted in this article has been supported by the National Science Foundation, the federal agency charged with funding basic research and education across all fields of science and engineering. Any opinions, findings, and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation. See the Behind the Scenes Archive.