A PWM strategy for four-leg voltage source converters and applications to a novel line interactive UPS in a three-phase four-wire system

A four-leg pulse width modulation (PWM) voltage source converter (VSC) is used to supply three phase balanced voltage even under an unbalanced load condition in three phase four wire power distribution network. A novel carrier-based modulation technique for the converter is described with the concep...

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Bibliographic Details
Main Authors: Jang-Hwan Kim, Sul, Seung-Ki, Hyosung Kim, Jun-Keun Ji
Format: Conference Proceeding
Language:English
Subjects:
Applied sciences
Convertors
Electrical engineering. Electrical power engineering
Electrical machines
Electrical power engineering
Exact sciences and technology
Miscellaneous
Phase modulation
Power conversion
Power electronics, power supplies
Power networks and lines
Power systems
Pulse width modulation
Pulse width modulation converters
Regulation and control
Switching converters
Switching loss
Uninterruptible power systems
Voltage
Wire
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Description
Summary:A four-leg pulse width modulation (PWM) voltage source converter (VSC) is used to supply three phase balanced voltage even under an unbalanced load condition in three phase four wire power distribution network. A novel carrier-based modulation technique for the converter is described with the concept of an offset voltage and also is extended to so called 'discontinuous PWM (DPWM)' to minimize switching losses of VSC. As a practical application example of the four-leg VSC, a line interactive uninterruptible power supply (UPS) system is chosen. The feasibility of the proposed PWM strategies and control algorithms has been verified by the simulation and experimental results.
ISSN:0197-2618
2576-702X
DOI:10.1109/IAS.2004.1348782