Cape Scott Wind Farm
model validation exercise
Presentation to WECC REMTF
November 18, 2014
99 MW Cape Scott Wind Plant
• Located at the Northern tip of Vancouver Island
• Very weak interconnection (SCR as low as 1.5 on
34.5 KV bus
• Extensive PSCAD simulations done during
interconnection studies
• Custom PSSE models developed by Vestas have
been successfully validated against PSCAD studies
• BC Hydro has asked for generic models to satisfy
WECC requirements
Original Parameters provided by Vestas, with turbines controlling
voltage… Poor comparison with Generic Model, initial conditions
suspect!
Original Parameters provided by Vestas, with turbines controlling
voltage… Poor comparison with Generic Model, initial conditions
suspect!
Most recent generic models provided by Vestas… controlling Q
rather than voltage. Vestas says the model doesn’t work for
voltage control. Note that if the voltage at terminals is initialized
below 1.0 pu, initial condition suspect occur.
/
9073 'USRMDL' 1 'REECAU1' 102 0 6 45 6 9
0 0 1 0 0 0
.9 1.1 .01 -.01 .01 2 1 -1 1 -.11 .4 .4 .005 .5 -.5 1.1 .9 5 5 5 5
0 .01 1 0 1 0 1.2 .01 0 1 .5 1 .8 .36 .85 .25 .1 .45 .6 .45 .8 .45 1 1/
9073 'USRMDL' 1 'REGCAU1' 101 1 1 14 3 4 1
.005 .65 .9 .4 1.22 1.2 .2 .1 -1.3 0.02 1 49 -49 .5/
9073 'USRMDL' 1 'WTPTAU1' 104 0 0 10 3 1
4 .7 4 .7 .7 .3 17 0 10 -10/
9073 'USRMDL' 1 'WTARAU1' 105 0 0 2 0 1
.007 0/
9073 'USRMDL' 1 'WTDTAU1' 103 0 0 5 4 3
4.7 0.0000 0.851 .5275 .5/
9073 'USRMDL' 1 'WTTQAU1' 505 0 1 15 3 3 0
10 10 .4 60 1.003 0 .2 .58 .4 .72 .6 .86 .8 1 28.8/
/
The Vestas parameters were
mainly taken from an EPRI
model document. The
parameters highlighted in
yellow are parameters
which don’t map perfectly
to the PTI PSSE program,
therefore Electranix
guessed at them.
Immediately after the fault, the power reference in the electrical
model (REEC) goes above 1.0 pu, and begins oscillating
sinusoidally. As long as it stays above 1, there is no problem, but if
it dips below 1, problems occur as seen below…
Vestas is still working!
• Some parameters provided by Vestas are not
clear. We have guessed at these.
• Generic model performance doesn’t match
custom model performance
• Inverse current limit characteristic seems to
break PTI instructions for REECA
Conclusion and Status
• Vestas is reviewing the comparison between custom model and
generic model
• Vestas is reviewing inverse characteristic violation of PTI data sheet
• Vestas has been shown the steady state post fault disturbances. These
are not acceptable…
• PTI has been informed that voltage control doesn’t work for the Vestas
model
• Electranix will send the generic model to BC Hydro when the following
criteria are met:
– No initial conditions suspect. (may be subject to voltage being over 1.0)
– No steady state post fault disturbances
– Model will be set up to control Q, and voltage control will be handled by
STATCOM
– Incorrect behaviour based on custom model validation will be acceptable,
provided the plant rides through faults
– A strong recommendation will be made that the generic model not be
used for any studies near Cape Scott