Wind and storage system based dispersed generation contribution to power grid ancillary services and

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Wind and storage system based dispersed
generation contribution to power grid ancillary
services and network reliability
Arnaud DAVIGNY Ludovic LECLERCQ Aymeric
ANSEL Benoît ROBYNS Laboratoire
dElectrotechnique et dElectronique de Puissance
de Lille École des Hautes Études dIngénieur
(HEI), LILLE
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Introduction
- Participation to the ancillary services of a
variable speed wind turbine associated with
flywheel energy storage system (Generating
System) .
- The interconnection of two of them connected
to a grid is considered with a major event the
grid disconnection (islanding).
- A solution is proposed to allow the wind
generator based generating systems to work as
voltage sources with the help of a frequency
droop.
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Scheme of a Generating System (GSM)
PMSG
Network Or Isolated loads
Shaft 1
3?
IM
Shaft 2
3?
4
NETWORK INTERFACE
Converter 3
L2
L1
Network or isolated loads
C
Pg ref
Modulator and Connection generator
Pg mes
Angle ? and Uref calculation
Power calculation
Qg mes
-
?

Oscillator
-
U ref
?

Controller
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NETWORK INTERFACE
Converter 3
L2
L1
Network or isolated loads
C
Pg ref
Modulator and Connection generator
Pg mes
Angle ? and Uref calculation
Power calculation
Qg mes
-
?

Oscillator
-
U ref
?

Controller
6
NETWORK INTERFACE
Converter 3
L2
L1
Network or isolated loads
C
Pg ref
Modulator and Connection generator
Pg mes
Angle ? and Uref calculation
Power calculation
Qg mes
-
?

Oscillator
-
U ref
?

Controller
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NETWORK INTERFACE
Converter 3
L2
L1
Network or isolated loads
C
Pg ref
Modulator and Connection generator
Pg mes
Angle ? and Uref calculation
Power calculation
Qg mes
-
?

Oscillator
-
U ref
?

Controller
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Active power set point determination
DC bus control
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Simulated network configuration

Grid
SIMULATION
Islanding at time 150 s
Pgrid
BB2
line 1
line 2
BB1
BB3
Pg1
Pg2
Load 4 P4 300 kW Q4 50 kVar
Load 3 P3 100 kW Q3 50 kVar
Load 1 P1 300 kW Q1 100 kVar
Load 2 P2 100 kW Q2 50 kVar
GS1
GS2
vw1
vw2
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SIMULATION - ISLANDING Wind speeds m/s
Time (s)
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SIMULATION - ISLANDING Wind generator active
powers kW
Time (s)
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SIMULATION - ISLANDING Generating system and grid
active powers kW
Time (s)
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SIMULATION - ISLANDING Flywheel rotating speeds
rpm
Time (s)
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SIMULATION - ISLANDING Bus bar rms voltages kV
Time (s)
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SIMULATION - ISLANDING Generating system
reference frequencies Hz
Time (s)
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Conclusion
- The possibility of a generating system, which
associates a variable speed wind turbine and a
flywheel energy storage system, to participate to
the ancillary services has been investigated.
- The interconnection of two of them connected
to a grid has been considered.
- A solution has been proposed to allow the wind
generator based generating systems to work as
voltage sources with the help of a frequency
droop.
- It has been shown that the power generated by
each generating system can be controlled by
fixing the power set point when they are
connected to the grid, and that, in case of
islanding, they can share the global load of the
isolated network.
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Some Perspectives
- To improve the supervisory, for instance by
introducing a voltage droop and by taking into
account other events as balanced and unbalanced
voltage sags.
- To improve the power and energy storage
requirement determination by taking into account
the power smoothing effect induced by the
association of numerous generators in a wind
farm.
- To test the proposed generating system on a 3
kW test bench.
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3 kW Test Bench
Grid
PMSG
Filter
Isolated Load
MAS
FESS
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3 kW Test Bench