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
Reduction of low-frequency harmonics in modular multilevel converters (MMCs) by harmonic function analysis
TL;DR: In this paper, the authors derive algebraic formulae of harmonic voltage components of open loop control and derive feed-forward control to reduce low-frequency harmonics in MMC.
Journal ArticleDOI
Elimination of DC-Link Current Ripple for Modular Multilevel Converters With Capacitor Voltage-Balancing Pulse-Shifted Carrier PWM
Fujin Deng,Zhe Chen +1 more
TL;DR: In this paper, a control strategy is proposed for the current ripple elimination in the three-phase MMC, where the phase-shifted angles of the carrier waves are controlled to eliminate the ripple on the dc link.
Journal ArticleDOI
Asymmetric Mode Control of MMC to Suppress Capacitor Voltage Ripples in Low-Frequency, Low-Voltage Conditions
TL;DR: In this paper, an asymmetric mode control for a modular multilevel converter (MMC) operating at low-frequency and low-output-voltage conditions is proposed, where one arm does not produce output current and applies the major dc-link voltage, whereas the other arm sustains almost all output current with low dclink voltage.
Journal ArticleDOI
An Integrated Converter and Machine Control System for MMC-Based High-Power Drives
Mauricio Espinoza-B.,Roberto Cardenas,Jon Clare,Diego Soto-Sanchez,Matias Diaz,Enrique Espina,Christoph M. Hackl +6 more
TL;DR: A new integrated control scheme is discussed to regulate the voltage fluctuations of the modular multilevel converter, based on closed-loop vector-control of the Voltage fluctuations, maintaining them inside a predefined threshold.
Journal ArticleDOI
Application of Third-Order Harmonic Voltage Injection in a Modular Multilevel Converter
TL;DR: This study adopts the method of third-order harmonic voltage injection (THVI) to move the peak value of a reference voltage toward the high capacitor voltage and increase the utilization rate of the capacitor voltage.
References
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Journal ArticleDOI
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.
Book
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.
Book
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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