ge 2.x zero power voltage regulation measurement results vincent schellings ge energy
TRANSCRIPT
GE 2.x
Zero Power Voltage Regulation Measurement Results
Vincent Schellings
GE Energy
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February, 2006
Introduction
• Voltage Regulation
• Zero Power Voltage Regulation Concept
• Measurement Results
• Conclusions
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February, 2006
Voltage Regulation
To support the network voltage, GE wind turbines supply reactive
power
The GE Wind Farm Management
System controls the wind farm
voltage (or power factor) by
measuring voltage and current at the
substation
The Wind Farm Management System then compares the
actual wind farm output to the
voltage or parameter settings
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Voltage Regulation Example - Colorado Green
Voltage at POI
Wind farm power output
75km
SCR ~3.5
Collector Bus
UtilityTransmissionBus (POI)
Individual WTG
~20 km
20% variability in real power <1% variability in voltage
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Zero Power Voltage Regulation (ZPVR) Concept
Wind turbines generally operate unless:
• Low wind speeds
• High wind speeds, resulting in sudden loss of power
• Abnormal grid conditions
Through appropriate controls in the GE 2.x its converter can deliver reactive power (kVAR) without
wind (kW)
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ZPVR Benefits for the Grid
• Voltage support and regulation continues without active power generation
• Adverse voltage impact due to tripping wind turbines is greatly reduced or eliminated
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ZPVR benefits for the grid
Benefits are greatest in:• Weak grids (e.g. geographically remote systems, end of
long lines)
• Systems with high wind penetration
Alternatives are:• Separate dynamic VAR sources within the farm
• Grid reinforcements
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Measurement results
1. Turbine out of operation
2. Turbine supplies 200 kVAR reactive power and no active power
3. Turbine supplies 1100 kVAR reactive power and no active power
-200
100
400
700
1000
1300
1600
0 19 37 56 75 94 112 131
time (s)
Po
wer
(kW
) / R
eact
ive
po
wer
(kV
AR
)
active power reactive power
2
3
1
5980
6000
6020
6040
6060
6080
6100
6120
0 19 37 56 75 94 112 131
time (s)
volt
age
(V)
2
3
1
1. Mean value of 6025.8 V
2. Mean value of 6033.4 V
3. Mean value of 6083.7 V, an increase in grid voltage of 1%
Grid voltage can be influenced with a non-operating turbine
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Measurement results
-200
100
400
700
1000
1300
501 513 526 538 550 563 575 588 600
time (s)
po
wer
(kW
) /
reac
tive
po
wer
(k
VA
R)
power reactive power
Turbine continues constant supply of reactive power during operation of the turbine
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February, 2006
Conclusions
•Wind turbines can stabilize the grid voltage by supplying and absorbing reactive power
•The GE 2.x wind turbine contains a “Zero Power Voltage Regulation“ feature to provide reactive power without active power generation
•Zero Power Voltage Regulation is benificial for weak grids and systems with high wind penetration
•As a result of Zero Power Voltage Regulation, considerable savings can be achieved on the need for grid reinforcements or VAR sources in the wind farm
Thank youfor yourattention!
GE Energy