Siemens is currently installing the first Sitras SES Energy Storage Unit
with supercapacitor technology in the U.S. on the new TriMet
Portland-Milwaukie Light Rail Transit Line. The southeast Portland
Tacoma substation location will house the first U.S. storage unit that
allows for energy created during braking to be stored and then re-used
in one of two forms, energy savings or voltage stabilization during peak
demand times. TriMet will utilize the system in voltage stabilization
In voltage stabilization mode, the Sitras SES allows the system to avoid
problems that have led to disruptions in mass transit operations. If a
number of vehicles accelerate simultaneously, system voltage can drop
below a critical level and result in instances of undervoltage tripping
in vehicles and, consequently, lead to disruptions in passenger service.
The Sitras SES ensures the system voltage always remains within the
required range and voltage-related disruptions no longer occur.
"The regenerative energy storage unit is an important piece of the many
sustainable elements being incorporated in this light rail project,"
said Dan Blocher, executive director of TriMet Capital Projects. "With
Siemens as a partner, we know this pilot project is positioned to bring
a new and efficient technology to the U.S."
The Sitras Energy Storage unit is part of Siemens Smart Grid Rail
Electrification portfolio, providing solutions to reliably connect
railway systems to the power grid. In energy savings mode, the energy
storage unit absorbs the energy generated by braking rail vehicles and
stores it until the system can safely feed it back to the power supply
during vehicle acceleration. As a voltage stabilizer, the energy content
is constantly kept at a high level and energy is discharged when the
system voltage falls below a specified limit. Installation of the Sitras
Energy Storage Unit also allows TriMet to avoid placing a
utility-connected substation in the same location.
"With over 35 light rail systems operating in the U.S. and another 13
systems being built, light rail is an increasingly important method of
transportation for growing cities and the need to make this travel as
efficient and cost-effective as possible is paramount," said Therry
Godart, president of Siemens Smart Grid North America. "Siemens is proud
to offer grid reliability solutions to make rail investments work even
harder for this growing region that is leading the way to provide the
most efficient and accessible transportation systems for their citizens."
The Sitras SES has been successfully installed in Spain and Germany,
reducing the energy demand at Cologne Transit Authority substation by
15,000 kWh in one month. The use of just a single energy storage unit
could save a maximum of 500,000 kWh per year. In addition to the cost
saving, the storage unit can reduce CO2 emissions by 300 tons per year
with this reduction in energy generation.
Siemens is providing additional solutions for the overall 7.3-mile line
extension project that will connect the southeast corridor to downtown
Portland, and other regions that TriMet MAX serves. Siemens Rail Systems
18 rail vehicles at its Sacramento, CA facility for the
Portland-Milwaukie extension and Siemens Mobility and Logistics will be
implementing its Rail Automation signaling and communication (SCADA)
technologies to center control on the line extension.
The first substations will be installed beginning in October 2013. The
Portland-Milwaukie Light Rail Transit Project is set to open in 2015 and
will expand the MAX system to 60 miles and 97 stations.
For further information on the Sitras Energy Storage Unit, please see http://w3.siemens.com/smartgrid/global/en/products-systems-solutions/rail-electrification/dc-traction-power-supply/Pages/stationary-energy-storage.aspx
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The Siemens Infrastructure & Cities Sector (Munich, Germany),
with approximately 90,000 employees, focuses on sustainable technologies
for metropolitan areas and their infrastructures. Its offering includes
products, systems and solutions for intelligent traffic management,
rail-bound transportation, smart grids, energy efficient buildings, and
safety and security. The Sector comprises the divisions Building
Technologies, Low and Medium Voltage, Mobility and Logistics, Rail
Systems and Smart Grid. For more information, visit http://www.siemens.com/infrastructure-cities.
The Siemens Smart Grid Division supplies products and solutions
for intelligent and flexible electrical network infrastructures. To meet
growing energy needs, the networks of today and tomorrow must integrate
all forms of power generation and ensure bi-directional energy and
communication flows. Intelligent networks help make it possible to
generate and use power efficiently and on demand. They contribute to the
electrification of railroads and also supply industrial enterprises,
infrastructure elements and entire cities with electricity. For more
information, visit www.usa.siemens.com/smartgrid.
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