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Title:
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Neutral-point current modeling and control for neutral-point clamped three-level converter drive with small DC-link capacitor
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Author:
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Maheshwari, RamKrishan; Munk-Nielsen, Stig; Busquets Monge, Sergio
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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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A Neutral-Point-Clamped (NPC) three-level
inverter with small DC-link capacitors is presented in this
paper. This inverter requires zero average neutral-point
current for stable neutral-point potential. A simple carrier
based modulation strategy is proposed for achieving zero
average neutral-point current. A new simplified model of the
neutral-point voltage dynamics is derived for the proposed
modulation strategy. This model shows that the neutral-point
current is proportional to the power drawn from the converter
and it enables the use of well established classical control
theory for neutral-point voltage controller design. A PI
controller is used for neutral-point voltage balance. The
implementation of the proposed modulation strategy and
controller is simple. It does not require any information about
the output phase currents. The controller is implemented in a
7.5 kW induction machine based drive with only 14 μF DC-link
capacitors. A fast and stable performance of the neutral-point
voltage controller is achieved and verified by experiments. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència
-Pulse techniques (Electronics)
-Switching circuits
-Electric current converters
-Impulsos(Electrònica)
-Circuits de commutació
-Convertidors de corrent elèctric |
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Rights:
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Document type:
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Article - Published version
Conference Object |
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Published by:
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IEEE Press. Institute of Electrical and Electronics Engineers
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