Multilevel inverter by cascading industrial VSI
- 7 November 2002
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Industrial Electronics
- Vol. 49 (4), 832-838
- https://doi.org/10.1109/tie.2002.801069
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.Keywords
This publication has 4 references indexed in Scilit:
- Assessment of medium voltage PWM VSI topologies for multi-megawatt variable speed drive applicationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- A new modular motor-modular inverter (MM-MI) concept for medium voltage adjustable speed drive systemsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- A new medium-voltage PWM inverter topology for adjustable-speed drivesIEEE Transactions on Industry Applications, 1999
- Medium-voltage adjustable-speed drives-users' and manufacturers' experiencesIEEE Transactions on Industry Applications, 1997