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Title:
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Overmodulation of n-level three-leg DC-AC diode-clamped converters with comprehensive capacitor voltage balance
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Author:
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Busquets Monge, Sergio; Maheshwari, RamKrishan; Munk-Nielsen, Stig
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. GREP - Grup de Recerca en Electrònica de Potència |
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Abstract:
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This paper presents a novel pulsewidth modulation
(PWM) strategy for n-level three-leg semiconductor-clamped
dc–ac converters in the overmodulation region, with dc-link capacitor
voltage balance in every switching cycle. The strategy is
based on the virtual-vector concept. Suitable reference vector trajectories
are selected to obtain low weighted total harmonic distortion
and a simple algorithm. A hexagonal-boundary compression
factor is introduced to guarantee, at any operating point, dc-link
capacitor voltage regulation capabilities in every switching cycle
and avoid narrow gate pulses. The detailed PWMalgorithm for an
easy implementation in a digital control platform is also presented.
The good performance of the strategy is verified through both simulation
and experiments in a three-level three-phase neutral-point
clamped converter. |
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Subject(s):
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-Àrees temàtiques de la UPC::Energies::Energia elèctrica
-AC-DC converters
-Capacitor voltage balance
-Diode-clamped multilevel dc–ac converter
-Overmodulation
-Space vector pulsewidth modulation (SVM)
-Three-level neutral-point-clamped converter
-Virtual vectors
-Convertidors altern-continu |
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Rights:
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Document type:
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Article - Published version
Article |
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Published by:
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IEEE Press. Institute of Electrical and Electronics Engineers
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