IEEE Power & Energy Magazine - November/December 2015 - 28

Wind generation is now reaching substantial penetration levels in
many regions, and grid integration has emerged as a potential limit
on further development of this environmentally friendly resource.
Voltage Regulation

other mainstream manufacturers choose to provide dynamic
reactive capability with another flexible alternating current
transmission system device, such as a static synchronous
compensator (STATCOM). The end result, however, is
functionally the same in regard to tightly controlled plantlevel voltage regulation performance. Voltage regulation
from wind plants is a proven technology that has been
available for many years. The plant control system can also
control VAR at a point of interconnection a distance away
from the wind plant, coordinate additional static capacitor/reactor banks, and control the startup and shutdown
sequence of the wind plant.

Wind Plant Voltage

Figure 5 shows the response of a wind plant, consisting
of 108 GE 1.5 MW WTGs, to 60 minutes of highly variable wind speed. This wind plant is connected to the grid
by a dedicated 42-mi, 230-kV transmission line. The short
circuit capacity at the remote point of grid interconnection is quite low compared to the 162-MW rating of the
wind plant, approximately 670 MVA, yielding a plant level
short circuit ratio around four p.u. under normal operation.
Accounting for the wind plant collector system, the short
circuit strength ratio is even lower, around 2.3 p.u. under
some conditions.

Wind Speed

Voltage at POI

(a)

Wind Speed
Wind Plant Power Output

(b)

figure 5. A demonstration of voltage regulation performance during variable power output conditions: (a) the wind plant voltage and the voltage at the point of interconnection with the grid; (b) the wind plant power output for the same wind speed.
28

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november/december 2015



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - November/December 2015

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