IEEE PES T&D Conference & Exposition 2022 - 79

Since these M-SSSC solutions are modular, the unlikely
failure of a single device does not impact the rest of the
deployment and thus provides greater reliability. FSCs
have several components that represent a single point of
failure. An FSC failure would remove the entire series
compensation until an outage is scheduled and maintenance
work completed resulting in potential negative
impacts on reliability and cost. The M-SSSC deployment
would continue to operate at a slightly reduced compensation
after a device failure.
Section 3: Central Hudson's Approach
to Adopting New Technology
To gain operational experience with the technology,
Central Hudson commissioned a pilot project to install
M-SSSC devices near its Ohioville substation before implementation
at the Hurley Avenue substation. The pilot
included three M-SSSC devices, one per phase, and three
accompanying bypass units. Central Hudson conducted
the installation design effort with Smart Wires guidance.
The installation design utilized an existing guyed
three-pole steel corner dead-end structure just outside of
the Ohioville substation fence, on a 115 kV line between
the Ohioville and Sturgeon Pool substations. The structure
was modified by adding new galvanized steel cross
arms to connect the poles and support the devices. The
addition of post insulators provided lateral stability to
the poles. Suspension insulators added to the cross arms
supported the device's weight. Due to their physical
proximity, Central Hudson added in-line insulators to
existing down-guys to keep them adequately insulated
from the devices.
The Central Hudson construction manager contracted
a crew of five line workers for the installation work and
secured standard transmission line trucks as the primary
lifting equipment. The total installation occurred in 2019
and took approximately two full days in frigid and snowy
conditions. The ground was frozen, facilitating installation
instead of muddy conditions, which are less stable for line
truck work.
The original installation design called for 795 MCM
ACSR jumpers between the line and M-SSSC devices.
However, the ACSR jumpers proved challenging to work
with during lab testing. The team decided to use 500 MCM
Cu instead since it provided flexibility for an easier installation.
Central Hudson installed insulating tape on the
jumpers and terminals to protect against wildlife since
there is a differential potential between the jumpers and
the device enclosure.
The communication and control system was pre-configured
and tested before shipping to Central Hudson. A test
setup was used to verify RF connectivity via the antennas
to the PowerLine coordinators. A spectrum analyzer confirmed
no interference that would adversely impact system
operation.
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Central Hudson installed the system according to a jointly
developed specification, using equipment from SEL to integrate
the M-SSSC communication and control hardware.
Central Hudson provided 125 VDC power to the redundant
power supplies of the M-SSSC control equipment, including
power distribution via a fuse panel. Technicians installed
antennas on a mast outside the substation control house and
used LMR-400 cabling from the antennas to the M-SSSC
communication and control hardware.
The communication and control system established communications
with all three M-SSSC devices after a communication
issue with one device relating to an incorrectly
entered device identifier was resolved. The devices were
placed into injection at 500 VAC to test the system. A measurable
difference was noted in the power flow on the line as
shown in Figure 5.
The EMS integration with the Central Hudson remote
terminal unit lasted approximately 10 person-hours following
the initial commissioning. This work benefited from
figure 4. Installation of M-SSSC Phase 1 Pilot on Central
Hudson's system.
Line Current
240
230
220
210
200
190
180
Injection
tt + 8.33 min t + 16.66 min t + 25 min
Time of Day on 22 February 2019
figure 5. Line Current Measurement for All 3 Phases on
Ohioville-Sturgeon Pool Line.
ieee power & energy magazine
79
Line Current (A)
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