Abstract
The design and performance analysis of an open-ended three-phase induction motor, driven by an Infinite Level Inverter (ILI) with its speed control using scalar and direct vector control techniques are presented in this paper. The ILI belongs to an Active-Front-End (AFE) Reduced-Device-Count (RDC) Multi-level Inverter (MLI) topology. The fundamental structure of this inverter topology is a dc-to-dc buck converter followed by an H-bridge. This topology performs a high-quality power conversion without any shoot-through issues and reverse recovery problems. The performance of the proposed topology is validated using a resistive load. The THD of output voltage waveform obtained is 1.2%. Moreover, this topology has exhibited a high degree of dc-source voltage utilization. ILI considerably reduces the switching and conduction losses, since only one switch per phase is operated at high frequency, and other switches are operated at power frequency. The overall efficiency of the inverter is 98%. The speed control performance of the ILI topology using three-phase open-ended induction motor has been further validated through scalar and direct vector control techniques. Results obtained from simulation studies are verified experimentally.
Highlights
N OWADAYS dc-to-ac inverters are playing a crucial role in power electronic areas such as electric drives, electric vehicles/hybrid electric vehicles, uninterruptable power supplies, HVDC power transmission, renewable energy integration, Flexible AC Transmission Systems (FACTS) and static VAR compensators
This paper presents five Main Submodules (SMs)to be used as the basic structures of MLIs and has widely reviewed almost all presented multilevel inverters in these manuscripts based on the proposed Sub Modules (SM) with variety connections
This study presents a new inverter topology based on a mixture of cascaded basic units and one H-bridge unit
Summary
N OWADAYS dc-to-ac inverters are playing a crucial role in power electronic areas such as electric drives, electric vehicles/hybrid electric vehicles, uninterruptable power supplies, HVDC power transmission, renewable energy integration, Flexible AC Transmission Systems (FACTS) and static VAR compensators. Based on the development and the nature of output voltage waveform, the inverters are broadly classified as two-level or square wave inverters, quasi-square wave inverters, two-level PWM inverters and multilevel inverters (MLI). The major problems associated with conventional or two-level inverters include the requirement of semiconductor devices of higher power ratings. To obtain the required voltage/current capacity, many devices need to be connected in series/parallel strings. As a result, these inverters generate low power quality output waveforms along with more conduction loss. To overcome the aforementioned drawbacks, MLI can be chosen as a better alternative [1]
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