A Novel Four-Level Voltage Source Inverter-Influence of Switching Strategies on the Distribution of Power Losses

In this paper, a novel four-level inverter will be presented and analyzed. The proposed inverter topology, which is composed of a conventional two-level and a three-level neutral-point clamped (NPC) inverter, is suitable for high-voltage and high-power applications. The proposed inverter, when it is...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2007-01, Vol.22 (1), p.149-159
Main Authors: Perantzakis, G.S., Xepapas, F.H., Manias, S.N.
Format: Article
Language:English
Subjects:
Applied sciences
Circuits
Connection and protection apparatus
Convertors
DC-Link capacitor voltage balance
Electric potential
Electrical engineering. Electrical power engineering
Electrical machines
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Inverters
Modulation
multilevel voltage source inverter (VSI)
Power electronics, power supplies
Power loss
Power semiconductor devices
Power semiconductor switches
Power supply
Pulse inverters
Pulse modulation
Pulse width modulation inverters
Reactive power
semiconductor device power losses
Semiconductors
sinusoidal pulsewidth modulation (SPWM)
Strategy
Switched capacitor circuits
Switching
Switching loss
Topology
Voltage
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Summary:In this paper, a novel four-level inverter will be presented and analyzed. The proposed inverter topology, which is composed of a conventional two-level and a three-level neutral-point clamped (NPC) inverter, is suitable for high-voltage and high-power applications. The proposed inverter, when it is compared with the conventional four-level NPC pulsewidth modulation inverter, exhibits the following advantages: a) ability of changing the power losses distribution profile among the devices by selecting a suitable switching strategy; b) reduction of total inverter power semiconductor device losses; c) ability of bidirectional operation for all power semiconductor switches; and d) easy implementation using existing power semiconductor modules. The effect of conduction and switching losses profiles of the proposed inverter for different switching strategies is examined under different loads, power factors, and modulation indices. The dc-link capacitors voltages are effectively balanced via a proposed self-voltage balancing topology, without the need of isolated dc voltage sources or additional voltage stabilizing circuits. Finally, the theoretical results are confirmed by simulation and experimental results
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2006.886627