Ameren Corp. and S&C Electric Co.
conducted a successful 24-hour islanding test at the recently deployed Ameren
microgrid in Champaign, Illinois. The
microgrid has been operational since
May and can provide a transition from
grid-connected to island mode.
The test focused on the 50 k W microgrid at the site, which powers an Ameren
research facility. The complete microgrid
includes 225 k W of renewable generation
(PV solar and wind) and 250 kW/500
k Wh of battery energy storage.
The August test began with the battery’s state of charge at 97 percent capacity. Once the battery was depleted to 90
percent capacity, solar and wind generation kicked in, simultaneously carrying
the load and charging the battery.
This pattern continued throughout the
day, never letting the battery fall lower than
88 percent capacity. In short, the microgrid
functioned without any human interaction,
automatically coordinating resources and
ensuring power never faltered.
Upon conclusion of the 24-hour test,
the microgrid successfully moved back
into grid-connected mode without any
loss of power for end users.
“We have one of the few microgrids
in the world that operates at utility-scale
voltages and can seamlessly transition
from grid-connected to islanded mode,”
said Ron Pate, senior vice president,
operations and technical services at
Ameren Illinois. “This successful test pro-
vided tangible proof that the system can
accomplish what it was designed to do.
The microgrid isn’t theoretical and our
tests don’t need to be lab simulations.”
During the test, the Ameren microgrid
functioned on 100 percent renewable
energy throughout the day. Many micro-
grids of this scale need to rely on rotating
machines or generators, which prevent
100 percent penetration of renewable
energy in these situations.
At the Ameren microgrid, when the
generation exceeds the load, the excess
powers the battery. With a rotating
machine, the influx of generation would
have caused the system to trip due to
“When designing this microgrid, we
were confident that the seamless transition and the ability to run solely on
renewable generation would be two of the
biggest features to this system,” said David
Chiesa, senior director, business development at S&C. “Microgrids are becoming
more commonplace on the grid, and this
test continues to prove how impactful
they can be for energy users.”
S&C ELECTRIC, AMEREN PULL OFF ISLANDING TEST ON ILLINOIS MICROGRID
Duke Energy Kentucky launched its
smart meter deployment program last
month, bringing new digital technology
to customers in northern Kentucky.
The Kentucky Public Service Commission
approved the smart meter rollout in
May. Duke has about 143,000 electric
customers in five Kentucky counties.
The new meters offer several enhanced
services that will provide customers with
more control over their energy use as
well as tailored bill payment options.
Customers with smart meters will have
the opportunity to pick billing due dates
and receive alerts that will guide their
monthly budgeting and help them man-
age their personal energy lifestyle.
“Customers have told us they want
more timely access to their energy usage
information, and bringing these smart
meters to Kentucky is a way for us
to meet those expectations,” said Jim
Henning, president, Duke Energy Ohio
and Kentucky. “We know our customers
also want more control over their energy
usage, their utility bills and tools to help
them make smart energy choices to best
fit their needs.”
Deployment will take approximately
DUKE COMMENCING SMART METER ROLLOUT IN KENTUCKY