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SUMMARY:Controller Design of a Grid-tie Inverter to Enhance Fault-Ride-Thr
 ough Capability - Yoshito Ohta\, Kyoto University
DTSTART:20140826T130000Z
DTEND:20140826T140000Z
UID:TALK53575@talks.cam.ac.uk
CONTACT:Tim Hughes
DESCRIPTION:The use of photovoltaic (PV) and wind power generation is grow
 ing.  With the increase of distributed generators\, inverters are subject 
 to stricter rules for connection and/or disconnection.  The rules include 
 fault-ride-through (FRT) capability: inverters are required to keep operat
 ing even if the voltage or frequency of the grid changes in a short period
  of time.  This talk proposes a novel approach for the controller design o
 f a three-phase grid-tie inverter to enhance FRT capability. First\, we an
 alyze the input-output map of the system consisting of the cascade connect
 ion of a diagonal transfer function pre- and post-multiplied by DQ (direct
 -quadrature) and inverse DQ transformations which are prevalently used as 
 a controller for systems with a rotating axis.  We show that when the angu
 lar velocity is constant the map is time-invariant.  Second\, we analyze t
 he effects of positive and negative phase sequence disturbances\, and show
 s that the conventional method has poor ability to reject negative phase s
 equence disturbances.  Finally\, we apply the analysis to the controller d
 esign for a gridtie inverter bypassing DQ transformation. The efficacy of 
 the proposed method is verified by a simulation and an experiment.
LOCATION:Cambridge University Engineering Department\, LR5
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