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During unbalanced grid voltage faults the Power injected to the grid experiences 100Hz oscillations
as a result of interactions between positive and negative sequence components of three-phase voltages
and currents. These oscillations can become as high as %50 percent of the rated power. In this article
an improved controller is proposed which present different behavior during normal operation and faults
to keep track of non-sinusoidal current reference signals. The reference signals are calculated to obtain
zero power oscillations. Reconfigurable resonant controllers are used for this purpose applied to 3-level
Neutral-point-clamped converter in the megawatt range.
CitationMiranda, H. [et al.]. DC-link voltage oscilations reduction during unbalanced grid faults for high power wind turbines. A: European Conference on Power Electronics and Applications. "EPE 2011: 14th European Conference on Power Electronics and Applications: 30 August to 1 September 2011, Birmingham, UK". Birminghan: 2011, p. 1-11.
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