The
new
code
demands
that
projects
use
only
turbines
with
low-voltage
ride-through
(
LVRT)
capability.
This
technology,
which
keeps
turbines
operating
even
after
a
large
drop
in
voltage,
has
become
increasingly
vital
following
a
series
of
major
outages
at
wind
farms
this
year.
On
17
April,
702
turbines
tripped
off
the
grid
at
a
wind
farm
in
Jiuquan,
Gansu
province,
after
two
box
transformers
broke
down,
causing
a
dip
in
voltage.
On
the
same
day,
644
turbines
had
to
be
disconnected
in
Zhangjiakou,
Hebei
province,
for
the
same
reason.
Two
similar…
