Neutral point voltage control of neutral point clamped converters

Mohzani, Z 2014, Neutral point voltage control of neutral point clamped converters, Doctor of Philosophy (PhD), Electrical and Computer Engineering, RMIT University.


Document type: Thesis
Collection: Theses

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Title Neutral point voltage control of neutral point clamped converters
Author(s) Mohzani, Z
Year 2014
Abstract The most widely used Medium Voltage multilevel converter is the 3-level AC/DC Neutral-Point Clamped (NPC) converter. It provides: a) twice the voltage rating, b) a reduction in the volumetric size and weight over the traditional 2-level converter. However, these benefits are lost when the Neutral Point (NP) drifts away from its ideal value (0 V).The first method is to modify the modulator of the converter to control the NP. Numerous variations on this control method have been proposed yet there is no comprehensive material that compares these variations in terms of voltage quality, NP ripple, and NP control performance.

Another method exploits the converter's natural ability to recover its NP however little is still understood about this phenomenon. This thesis will: a) compare all the numerous modulator-based strategies and, b) model the natural-balancing phenomenon, c) demonstrate how natural balancing’s performance can be enhanced with an additional RLC element, d) how perfect harmonic output and fast natural balancing can be achieved through DC link compensation. The final aim is to show the reader the best method in controlling the NP of the converter.

Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Electrical and Computer Engineering
Keyword(s) 3-level
Neutral Point Clamped
NPC
NP drift
THD
balancing
midpoint
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Created: Fri, 21 Nov 2014, 09:59:52 EST by Denise Paciocco
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