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SUMMARY:Sum of squares programming for discrete-time non-linear systems - 
 with application to power converters - Morten Hovd\, Norwegian University 
 of Science and Technology
DTSTART:20151029T140000Z
DTEND:20151029T150000Z
UID:TALK61454@talks.cam.ac.uk
CONTACT:Tim Hughes
DESCRIPTION:The presentation will give a brief introduction to sum of squa
 res (SOS) programming\, and will present some key issues and steps in appl
 ying this to Lyapunov-based synthesis for discrete-time nonlinear systems.
  The focus will be on bilinear systems as many power converters can be mod
 elled as bilinear systems\, but the concepts can be generalized to polynom
 ial nonlinear systems that are affine in the inputs.\n\nThe controller syn
 thesis method will then be illustrated on the control of a Modular Multile
 vel Converter (MMC) for HVDC. The MMC has several advantages compared to c
 onventional converters for HVDC.  However\, the internal control of the co
 nverter is a challenge due to a high number of internal switches. With an 
 SOS-based controller we are able to obtain good results.\n\nFinally\, some
  robustness issues in the SOS design will be addressed\, and illustrated o
 n the averaged model of a boost converter (which also is described by a bi
 linear model).\n
LOCATION:Cambridge University Engineering Department\, LR12
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