Multilevel inverter by cascading industrial VSI
Teodorescu, R.
Blaabjerg, F.
Pedersen, J.K.
Cengelci, E.
Enjeti, P.N.
Dept. of Electr. Energy Conversion, Aalborg Univ. ;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Aug 2002
Volume: 49,
Issue: 4
On page(s): 832- 838
ISSN: 0278-0046
INSPEC Accession Number: 7356037
Digital Object Identifier: 10.1109/TIE.2002.801069
Current Version Published: 2002-11-07
Abstract
In this paper, the modularity concept applied to medium-voltage adjustable speed drives is addressed. First, the single-phase cascaded voltage-source inverter that uses series connection of insulated gate bipolar transistor (IGBT) H-bridge modules with isolated DC buses is presented. Next, a novel three-phase cascaded voltage-source inverter that uses three IGBT triphase inverter modules along with an output transformer to obtain a 3-p.u. multilevel output voltage is introduced. The system yields in high-quality multistep voltage with up to four levels and low dv/dt, balanced operation of the inverter modules, each supplying a third of the motor rated kVA. The concept of using cascaded inverters is further extended to a new modular motor-modular inverter system where the motor winding connections are reconnected into several three-phase groups, either six-lead or 12-lead connection according to the voltage level, each powered by a standard triphase IGBT inverter module. Thus, a high fault tolerance is being achieved and the output transformer requirement is eliminated. A staggered space-vector modulation technique applicable to three-phase cascaded voltage-source inverter topologies is also demonstrated. Both computer simulations and experimental tests demonstrate the feasibility of the systems.
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