NYPA Redirects Power
Between 2 Lines by Using Transmission Control Device
September 1, 2004
FOR IMMEDIATE RELEASE
MARCY—An advanced feature of a new
transmission-control device recently completed at the New York Power
Authority’s (NYPA) Frederick R. Clark Energy Center here got its
first use this week, with power redirected from one transmission
line to another in the same substation.
NYPA utilized the new feature shortly before
noon on Monday (Aug. 30) on instructions of the New York Independent
System Operator (NYISO), which determined that system conditions
warranted the transfer capability of the convertible static
compensator (CSC), as the device is known, in addition to other
“The utilization of equipment installed for the
second and final phase of the convertible static compensator
reflects New York State’s recognition under Governor George E.
Pataki of the benefits of new technologies to improve the
versatility and strength of its electric power system,” NYPA
President and CEO Eugene W. Zeltmann said. “The new equipment
allowed us to redirect power between two circuits at Marcy,
responding to system conditions.”
The CSC operated in a mode referred to as static
series synchronous compensator, or SSSC, one of several
configurations the equipment is designed for.
Last June, Governor Pataki announced the
completion of the second phase of the CSC, which was already
providing significant benefits stemming from work finished in
mid-2001. Equipment installed under the project’s first phase
provided voltage support for increasing power flow on the statewide
power grid by up to 114,000 kilowatts (kw). The second phase
increased the total amount to up to nearly 200,000 kw.
The NYISO, which oversees the operation of the
state’s power grid, directed NYPA to activate the Phase 2 equipment
to assist in maintaining reliable power flows.
The ISO issued the directive to make certain
that a circuit between Roseton in Orange County and East Fishkill in
Dutchess County would continue to operate within safe operating
limits in the unlikely event of problems elsewhere on the system.
The ISO asked NYPA to use the Phase 2 equipment to redirect a
portion of the power on the circuit, which is part of the Power
Authority’s Marcy-South transmission line, from Marcy to East
Fishkill, and move it to another 345-kilovolt line extending to New
Scotland in Albany County.
The new equipment operated for about two hours,
before system conditions allowed the CSC to be returned to an
operational mode for voltage support.
The Governor’s announcement in June of the
equipment’s completion coincided with an event led by Lt. Governor
Mary O. Donohue celebrating the milestone.
The $54 million CSC is largely contained in a
gymnasium-sized building at the Clark Energy Center. The operations
of NYPA’s 17 generating facilities and its 1,400 circuit-miles of
transmission lines are monitored, and information is exchanged with
the NYISO, from the Authority’s Energy Control Center at Clark.
NYPA invested more than $41 million in the
transmission-control device, with the remainder provided by various
power industry organizations with an interest in advancing the
technology and sharing what’s learned from NYPA’s experience. They
included EPRI (Electric Power Research Institute), the industry’s
science and technology development organization; Siemens Power
Transmission and Distribution, the manufacturer of the CSC; and more
than 30 other utilities and independent system operators in the
U.S., Canada and New Zealand.
The CSC belongs to a family of so-called FACTS
technology—an acronym for Flexible Alternating Current Transmission
Systems—in which high-speed, solid-state electronics are used rather
than conventional electromechanical devices to control transmission
voltage and power flow.