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Statcom controls for operation with unbalanced voltages

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2 Author(s)
Hochgraf, C. ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; Lasseter, R.H.

Voltage sourced static VAr compensators such as the Statcom need to be able to handle unbalanced voltages. Mild imbalance can be caused by unbalanced loads while severe short-term imbalance can be caused by power system faults. A synchronous frame voltage regulator is presented that works even when three phase symmetry is lost. This regulator addresses voltage imbalance by using separate regulation loops for the positive and negative sequence components of the voltage. The proposed regulator allows the Statcom to ride through severe transient imbalance without disconnecting from the power system and, further, to assist in rebalancing voltages. The regulator maintains sufficient bandwidth to perform flicker compensation. The controller's performance is simulated for a Statcom in a model distribution system where it is subjected to a severe single line to ground fault and a rapidly varying three phase load

Published in:

Power Delivery, IEEE Transactions on  (Volume:13 ,  Issue: 2 )

Date of Publication:

Apr 1998

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