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Dual Frequency Regulation in Pumping Mode in a Wind–Hydro Isolated System.pdf


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Energies 2018, 11, 2865

3 of 17

Energies 2018, 11, x FOR PEER REVIEW
Energies 2018, 11, x FOR PEER REVIEW

3 of 17
3 of 17

Table
technologyduring
during2016
2016[25].
[25].
Table1.1.Energy
Energysupplied
supplied by
by each
each generation
generation technology
Table 1. Energy supplied by each generation technology during 2016 [25].
EnergySupplied
Supplied
Energy
Demand
Demand
Energy
Supplied
VSWTs
Diesel
Generators
Hydropower Plant
Plant
VSWTs
Diesel
Generators
Demand Hydropower

58.58MWh
MWh
58.58
58.58
100%
100%MWh
100%

Hydropower
Plant 28.88
VSWTs
2.13
2.13 MWh
MWh
28.88MWh
MWh
2.13
MWh
28.88
MWh
3.63%
49.29%
3.63%
49.29%
3.63%
49.29%

Diesel
Generators
27.58
MWh
27.58
MWh
27.58
MWh
47.07%
47.07%
47.07%

In Figure 1, the simplified scheme of the W-PSHP is shown, describing the water and energy
InIn
Figure
the simplified
scheme
of the
W-PSHP
is shown,
describingthe
thewater
waterand
andenergy
energy
Figure1,1,
scheme
W-PSHP
shown,
flow according
to the
the simplified
operation mode
of of
thethe
turbine
and is
the
pump.describing
The wind farm,
at a power
rate
flow
according totothe
mode of
and
the pump.
pump. The
The windfarm,
farm,atata apower
power rate
flow
theoperation
operation
ofthe
the turbine
turbine
and
the
of
11.5according
MW, is equipped
with fivemode
variable-speed
wind
turbines
(VSWTs) wind
ENERCON-E70,
while rate
the
of of
11.5
MW,
is is
equipped
with
five
variable-speed
wind
turbines
(VSWTs)ENERCON-E70,
ENERCON-E70,while
whilethe
the
11.5
MW,
equipped
with
five
variable-speed
wind
turbines
(VSWTs)
four Pelton turbines provide the remaining power of 4 × 2.8 MW [23]. The PSHP includes a pump
four
Pelton
the
power
of
2.8
MW [23].
[23].
The
PSHP
includes
apump
pump
four
Pelton
provide
the
remaining
power
of 44 ×
×is2.8
MW
The
PSHP
includes
station
thatturbines
isturbines
able toprovide
consume
6 remaining
MW.
The pump
station
equipped
with

0.5 MW
FSPs aand

station
that
is
able
to
consume
6
MW.
The
pump
station
is
equipped
with
6
×
0.5
MW
FSPs
station
that
is
able
to
consume
MW.
The
pump
station
is
equipped
with
6
×
0.5
MW
FSPs
and
2and
×
1.5 MW VSPs.

1.5
MW
VSPs.
1.5 MW
VSPs. above, in this paper, a new dual frequency control provided only by the pumping
As stated
AsAs
stated
above,
ininthis
paper,
aanew
frequency
control
provided
only
bythe
thepumping
pumping
above,
this
paper,
new dual
dual
frequency
control
provided
by
station
isstated
proposed
when
there
is high
wind
power
production.
Diesel
units areonly
not connected
to the
station
is
proposed
when
there
is
high
wind
power
production.
Diesel
units
are
not
connected
totothe
station
is
proposed
when
there
is
high
wind
power
production.
Diesel
units
are
not
connected
the
grid. The four generators driven by the Pelton turbines, as shown in Figure 2, operate as synchronous
grid.
The
four
generators
driven
by
the
Pelton
as
shown
in
Figure
2,
operate
as
synchronous
grid.
The
four
generators
driven
by
the
Pelton
turbines,
shown
in
Figure
2,
operate
as
synchronous
condensers and not in no-flow mode [24]. Therefore, they provide voltage regulation and inertia.
condensers
andnot
no-flow
mode
[24]. Therefore,
Therefore,
they
provide
voltage
regulation
inertia.
condensers
and
ininno-flow
mode
[24].
they
provide
voltage
regulation
and
inertia.
Figure
2 shows
a not
simplified
one-line
diagram
of El Hierro
power
system
in this
scenario. and
Figure
2 shows
a simplifiedone-line
one-linediagram
diagramof
ofEl
El Hierro
Hierro power
power system
Figure
2 shows
a simplified
system in
in this
thisscenario.
scenario.

Figure1.1.El
ElHierro
Hierrohybrid
hybrid wind
wind pumped-storage
pumped-storage hydropower
Figure
hydropowerplant
plant(W-PSHP)
(W-PSHP)system.
system.
Figure 1. El Hierro hybrid wind pumped-storage hydropower plant (W-PSHP) system.

Figure
system, simplified
simplifiedone-line
one-linediagram.
diagram.
Figure2.2.El
El Hierro
Hierro power
power system,
Figure 2. El Hierro power system, simplified one-line diagram.