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Hardware-in-the-loop grid simulator system and method

United States Patent

9,651,629
May 16, 2017
View the Complete Patent at the US Patent & Trademark Office
A hardware-in-the-loop (HIL) electrical grid simulation system and method that combines a reactive divider with a variable frequency converter to better mimic and control expected and unexpected parameters in an electrical grid. The invention provides grid simulation in a manner to allow improved testing of variable power generators, such as wind turbines, and their operation once interconnected with an electrical grid in multiple countries. The system further comprises an improved variable fault reactance (reactive divider) capable of providing a variable fault reactance power output to control a voltage profile, therein creating an arbitrary recovery voltage. The system further comprises an improved isolation transformer designed to isolate zero-sequence current from either a primary or secondary winding in a transformer or pass the zero-sequence current from a primary to a secondary winding.
Fox; John Curtiss (Clemson, SC), Collins; Edward Randolph (Clemson, SC), Rigas; Nikolaos (North Charleston, SC)
Clemson University (Clemson, SC)
13/ 943,200
July 16, 2013
STATEMENT OF GOVERNMENT SUPPORT The present invention is supported by government funding under Grant No. DE-EE-0005723 from the U.S. Department of Energy. The U.S. Government has certain rights in this invention.