Accessing windpower module output in Python

ozsolarwind
Topic Author

02 Jan 2019 04:10 #6575 by ozsolarwind

Accessing windpower module output in Python was created by ozsolarwind

I've recently noticed that retrieving the 'gen' array - Total electric power to grid' is much slower than earlier releases of the SDK. The change actually occurred somewhere between Build 174 and 180. Is there a better way to access this data or is it due to some internal change?

I'm using Python 2.7 and the relevant code is:

Code:

clock_start = time.clock()
module = ssc.Module('windpower')
print time.clock() - clock_start
farmpwr = self.data.get_array('gen')
print time.clock() - clock_start

Build 174 and prior would take about 2 seconds to execute the module and retrieve the data and it's now around 14 seconds. Below is a small execution log for two runs:

Code:

38:23. SAM SDK Core: Version = 174. Build info = Linux 64 bit GNU/C++ Jun 19 2017 05:06:12.
38:32. Processing Collgar Wind Farm
38:32. (0.000110 seconds)
38:34. (1.951400 seconds)
39:03. Power plot completed for Collgar Wind Farm. 568,148.0 MWh; CF 0.31

48:52. SAM SDK Core: Version = 180. Build info = Linux 64 bit GNU/C++ Oct 30 2017 03:52:08.
49:05. Processing Collgar Wind Farm
49:05. (0.000062 seconds)
49:19. (14.434305 seconds)
49:26. Power plot completed for Collgar Wind Farm. 573,984.0 MWh; CF 0.32

Kind regards

Angus

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pgilman

04 Jan 2019 14:51 #6576 by pgilman

Replied by pgilman on topic Accessing windpower module output in Python

Dear Angus,

We've fixed this problem. Thank you for pointing it out. For more on the problem, see:

github.com/NREL/ssc/issues/222

Best regards,
Paul.

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