Journal ArticleDOI
A Medium-Voltage Motor Drive With a Modular Multilevel PWM Inverter
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TLDR
In this article, the authors describe the control and operating performance of a modular multilevel PWM inverter for a transformerless medium-voltage motor drive, where the inverter is prominent in the modular arm structure consisting of a cascaded stack of multiple bidirectional choppercells.Abstract:
This paper describes the control and operating performance of a modular multilevel PWM inverter for a transformerless medium-voltage motor drive. The inverter is prominent in the modular arm structure consisting of a cascaded stack of multiple bidirectional chopper-cells. The dominant ac-voltage fluctuation with the same frequency as the motor (inverter) frequency occurs across the dc capacitor of each chopper-cell. The magnitude of the voltage fluctuation is inversely proportional to the motor frequency. This paper achieves theoretical analysis on the voltage fluctuation, leading to system design. A downscaled model rated at 400 V and 15 kW is designed and built up to confirm the validity and effectiveness of the nine-level (17-level in line-to-line) PWM inverter for a medium-voltage motor drive.read more
Citations
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Journal ArticleDOI
A General Review of Multilevel Inverters Based on Main Submodules: Structural Point of View
TL;DR: Five main submodules (SMs) to be used as the basic structures of MLIs are presented and categorized and investigated with from different perspectives such as the number of components, the ability to create inherent negative voltage, working in regeneration mode and using single dc source.
Journal ArticleDOI
A New Modulation Method for the Modular Multilevel Converter Allowing Fundamental Switching Frequency
TL;DR: In this article, a modulation method for the modular multilevel converter is proposed based on a fixed pulse pattern where harmonic elimination methods can be applied to achieve stable operation at the fundamental switching frequency without measuring the capacitor voltages or using any other form of feedback control.
Journal ArticleDOI
Modular Multilevel Converter With Different Submodule Concepts—Part I: Capacitor Voltage Balancing Method
TL;DR: A modulation strategy for the modular multilevel converter (MMC) which provides the voltage balancing of the capacitors of different submodules comprising the converter and is effective for arrangements with different submodule concepts.
Journal ArticleDOI
Circulating Harmonic Current Elimination of a CPS-PWM-Based Modular Multilevel Converter With a Plug-In Repetitive Controller
TL;DR: In this article, an improved circulating current control method by applying a digital plug-in repetitive controller is discussed for harmonic elimination of a carrier-phase-shift pulse-width-modulation (CPS-PWM)-based modular multilevel converter (MMC).
Journal ArticleDOI
Start-Up and Low-Speed Operation of an Electric Motor Driven by a Modular Multilevel Cascade Inverter
TL;DR: In this article, the authors proposed a square-wave method to suppress the peak circulating current of an electric motor driven by a modular multilevel cascade inverter based on double-star chopper cells.
References
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Instantaneous Reactive Power Compensators Comprising Switching Devices without Energy Storage Components
TL;DR: In this paper, a new instantaneous reactive power compensator comprising switching devices is proposed, which requires practically no energy storage components, and is based on the instantaneous value concept for arbitrary voltage and current waveforms.
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Instantaneous power theory and applications to power conditioning
TL;DR: The p-q theory in three-phase, four-wire Shunt Active Filters as discussed by the authors has been applied to power flow control in power electronics equipment and has been shown to be useful in many applications.
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High-Power Converters and AC Drives
TL;DR: In this article, the authors present a model for high-power switchings with SCR rectifiers and demonstrate how to use SCR Rectifiers to control high power switchings.
Journal ArticleDOI
Control and Experiment of Pulsewidth-Modulated Modular Multilevel Converters
Makoto Hagiwara,Hirofumi Akagi +1 more
TL;DR: In this article, two types of pulsewidth-modulated modular multilevel converters (PWM-MMCs) with focus on their circuit configurations and voltage balancing control are investigated.
Journal ArticleDOI
Active Harmonic Filters
TL;DR: This paper deals with general pure active filters for power conditioning, and specific hybridactive filters for harmonic filtering of three-phase diode rectifiers.
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