IEEE Power & Energy Magazine - November/December 2017 - 90

Recent and Ongoing
Wide-Area
Planning Efforts
United States

Wind Speed
m/s
>10.5
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
<4.0

Existing Transmission
HVdc
HVac
Voltage
345-499 kV
500-699 kV
700-799 kV
800-1,000 kV

figure 4. U.S. wind resources and the existing extra-high-voltage grid.
(Source: NREL).

Juan de
Fuca Cable

West
Coast
Cable

Western
Alberta
Transmission
Line

Eastern
Alberta
Transmission
Line

Zephyr

Transwest
Express

Centennial West

The U.S. grid is planned, regulated,
and operated by a wide range of entities. While the advent of RTOs and
recent FERC orders have sought to
lessen this, great hurdles remain for
planning and siting long-distance
transmission that would enable vast
amounts of renewables to be tapped.
Aside from regulatory and siting
challenges, technical challenges of
siting high-voltage dc (HVdc) in
relatively weak parts of the grid
also exist. Traditional HVdc (current
source-converter) projects suffer
from the potential need for additional fast-acting reactive support
or additional inertial support that
add costs and complexity. Voltage

Labrador
Island
Transmission
Link

Bipole
III
Champlain
Power
Express
Lake Erie
Clean Power
Connector

Roc

Green
Line

k Isl

and

DATC 4
Grain Belt
Express

Plai
ns an
d

DATC 2

Atlantic
Wind
Connection

Ea ster n
Southern
Cross

figure 5. The proposed HVdc projects in North America. DATC: Duke Energy & American Transmission Company
90

ieee power & energy magazine

november/december 2017



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - November/December 2017

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IEEE Power & Energy Magazine - November/December 2017 - Cover3
IEEE Power & Energy Magazine - November/December 2017 - Cover4
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