Current Contribution from Wind Plant for a System Fault Working Group C17 May 2010 Meeting
Dec 26, 2015
Details• 67 Suzlons S88 2.1MW wind turbine-
generator
• 61 turbine-generators sync. to the system before the fault
• B ph to gnd fault on 138kV tie line to wind plant occurred at 22:40 11/25/2009
Suzlons S88 2.1MW wind turbine-generator
• A type 2 wound rotor induction generator with variable rotor resistance
System One Line
138 kV
Total line length11.9 miles
To Canyon Compression/
Naughton
ToLong Hollow
MUDDY CREEK
143
133
Collector Circuits34.5kV
34.5kV
Fault location mileageFrom Muddy Crk
8.6 miles
MOUNTAIN WIND
9 Turbine Generators
10 Turbine Generators
10 Turbine Generators
9 Turbine Generators
9 Turbine Generators
10 Turbine Generators
10 Turbine Generators
Status at Wind Plant before the
Fault
61 machines sync to system
14.6MW total output
11.4% of nameplate
Using the Asynchronous Generator Values
Xs = 0.0536
Xm = 2.6
Xr = 0.0564
X’ = 0.1088 ohms
Synchronous data
X” = 0.0523 ohms
X’ = 0.0941 ohms
Comparison of ResultsB Phase I1 I2 I0 I1 + I2 + I0
Measured
Time 1 1.1 cycle 1908 398 297 1092 1786
Time 2 1.9 cycle 1850 330 420 1096 1812
Time 3 3.0 cycle 1650 230 379 963 1535
Time Fault Interrupted 4.1 cycles
Fault Study
Subtransient 1786 396 346 1044 1786
Transient (equivalent synchronous) 1713 343 341 1029 1713
Transient (equivalent asynchronous) 1692 327 339 1025 1692
Faulted phase voltage on closest generator's terminals 0.82 pu
Conclusion
• For relay performance the subtransient reactance using the equivalent synchronous data provides the best fault current values
• For breaker interrupting currents the transient reactance using the calculated value from the equivalent asynchronous data provides the best fault current values