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Power Quality Issues in Grid Connected Wind Farms

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Title: Power Quality Issues in Grid Connected Wind Farms


1
Power Quality Issues in Grid Connected Wind Farms
  • by
  • A.D.Thirumoorthy
  • Tamil Nadu Electricity Board
  • India

2
Wind Energy
  • Large untapped potential in India 65,000
    100,000 MW
  • Technologies Synchronous and Asynchronous
    Generators (with and without gears), New hybrid
    technologies are being introduced
  • Turbine unit sizes 500 kW to 1.65 MW, may go up
    to 2.0 MW in near future
  • Leading States Tamil Nadu 4200 MW, Maharashtra
    1800 MW, Gujarat 1400 MW
  • Costs Rs 6-6.5 Cr / MW subject to project
    size, location, technology

3
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4
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5
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6
Voltage Vs Var
  • Leading reactive power raises local voltage
  • Lagging reactive power lowers local voltage
  • Add capacitors to counteract low voltage
    conditions
  • Add reactors to counteract high voltage
    conditions, Turn off capacitors

7
VI In Wind Mill
8
Voltage Harmonics
9
Current Harmonics
10
Case Study (Voltage Sag in Wind Mills)
  • This is a typical case of Wind Mills tripping due
    to Voltage Sag
  • Voltage Sag caused by tripping of another feeder
    in the same Sub Station due to earth fault
  • Rise in load current experienced
  • Suspect of induction Generator aiding the fault

11
Sample Dip
12
Voltage Dip in WM Feeder
-49.61
13
Current rise in WM Feeder
268
14
Voltage Dip
-51.4
15
Tripping of WM Due to Sag
Loss of WM Generation -42.5
16
Case Study (Voltage Swell)
  • This a case study of Voltage Swell
  • Voltage swell caused in a Wind Mill connected
    feeder
  • Voltage Swell seen when Wind Mill connected
    feeder is isolated manually
  • Voltage swell due to discharge of Capacitors
    connected for PF correction

17
Voltage Rise in WM During Supply Failure
11.37
18
Voltage Rise in Wind Mill Feeder During Supply
Failure
15.37
19
Bipolar Transient
20
B-Phase voltage Drop put
21
Voltage SAG
22
Voltage Sag
23
Multiple Zero Crossing
24
Phase Shift Event
25
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26
Sample Un-balance of Voltage
27
Transient
28
Transient due Tripping of Breaker due to inrush
current
29
Flicker Data in Wind Mill
30
Sample Surge in Current
31
Swell in Current in Wind Mill
32
Active and Reactive Power in Wind Mill
33
Voltage Variation in Wind Mill
34
Frequency Profile
35
WM Generation Vs 110 KV Bus Voltage
36
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37
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38
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