Multilevel Power Conversion - An Overview Of Topologies And Modulation Strategies

Suh, Bum-Seok; Sinha, Gautam; Manjrekar, Madhav; Lipo, T.Α.

doi:10.1109/optim.1998.708006

Cited by 77 publications

(16 citation statements)

References 60 publications

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“…ASDs in this power level are typically connected to the medium voltage (MV) grids (2.3, 3.3, 4.16 or 6.9kV), while it is still a great challenge to connect the high-speed power semiconductor switches directly to such grids. As a result, significant effort has been directed to the research and development of multilevel inverters for MV applications [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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A New Multilevel Inverter - Hexagram Inverter for Medium-Voltage Adjustable Speed Drive Systems Part I. Six-phase Motor Drive

Wen

Smedley

2007

2007 International Conference on Power Engineering, Energy and Electrical Drives

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A new multilevel inverter -Hexagram inverter 1121, is introduced for medium-voltage adjustable speed drive systems. The new inverter is composed of six interconnected three-phase six-switch modules. With six terminals, Hexagram inverter can be configured for both six-phase and three-phase (floating neutral) motor drive. The focus of this paper is on Hexagram inverter for six-phase motor drive. With proposed Hexagram inverter topology, the semiconductor switches has half of the current stress and one third of the voltage stress compared to a same output power and output voltage VSI system, or the same current stress and one sixth voltage stress when compared to a same output power and output current VSI. With the modular six-switch structure, previously proposed control methods for VSI are all applicable. In this paper, One-Cycle Control and SPWM are respectively used for demonstration, simulation and experimental verification. The eminent characteristics of the Hexagram inverter including modular structure, low component count, low voltage and current stress, and automatic voltage and current balancing, make it an excellent candidate for high power motor drive applications.

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Section: Introductionmentioning

confidence: 99%

“…Compared to the inverter with delta-connected six-switch modules in [ 1], the Hexagram Inverter has following advantages: 1) Constant instantaneous power flow in each of its sixswitch modules.…”

Section: Introductionmentioning

confidence: 99%

A New Multilevel Inverter - Hexagram Inverter for Medium-Voltage Adjustable Speed Drive Systems Part I. Six-phase Motor Drive

Wen

Smedley

2007

2007 International Conference on Power Engineering, Energy and Electrical Drives

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“…The principal ones are classified in Figure 2 By means of Hybrid Modulation type, the goal is the reduction of the switching frequency of the higher power modules to reduce the switching losses in the multilevel converter. The idea is to combine the staircase modulation for the high and medium power modules with the PWM modulation for the low power module, as presented in [1,22,31]. An enhanced Hybrid Modulation was proposed by the authors in [3,32], which results in a lower line-to-line THD output voltage without increase of the switching frequency or losses.…”

Section: Modulation Strategymentioning

confidence: 99%

An Improved Asymmetric Cascaded Multilevel D–STATCOM with Enhanced Hybrid Modulation

2015

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Problems related to power quality, which in the last years were responsible only for small losses in low-voltage distribution systems, are now causing damage to power apparatuses and financial losses also in medium-voltage systems. The necessity of a better quality of power supply encourages the development of new specific custom power devices directly connected in medium-voltage distribution systems. It is well know that the multilevel converters are capable of being installed directly in the medium voltage, and presents several advantages when compared with conventional two-level converters. Some topologies, like the asymmetric cascaded multilevel converter, presents difficulties in regulating the voltages of all isolated dc-link capacitors. In this context, this article presents an asymmetric nineteen-level D-STATCOM (Distribution Static Synchronous Compensator) with a reactive power and dc-link regulation control loops for generic cascaded multilevel converters in order to improve the power quality in medium-voltage distribution systems. The performance of the proposed control method for a multilevel D-STATCOM is presented and evaluated in a downscaled prototype. OPEN ACCESSElectronics 2015, 4 312

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“…Note that the amplitude of current only decides the track speed [4] while the polarity of current will decide the polarity of control signal. The later one is more important during control, so one variable ξ , which has the same polarity with current, is used to replace the current.…”

Section: B Voltage Balance Algorithmmentioning

confidence: 99%

“…Among the possible topologies of multilevel converters, cascaded H-bridge (CHB) topology is of particularly interest for its modular structure, easy implementation and less components [3,4]. Moreover, it can reduce the voltage stress of the power switches and the size of the filter elements on the output of the inverter.…”

Section: Introductionmentioning

confidence: 99%

A novel voltage balance method for cascaded H-bridge rectifier

Xinghua

Sun

2010

2010 IEEE Vehicle Power and Propulsion Conference

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In this paper, a novel algorithm is introduced for DC-link voltage balancing in cascaded H-bridge rectifier. With this method, the modulation index of each cell can be regulated by surveying not only the total DC voltage but also each cell's DC voltage, therefore the modulation index of each cell can match their individual actual active power respectively and achieve the DC voltages balance. Furthermore, the steady area of such cascaded converter is discussed and the relationship of the active power ratio of two cells and the modulation index is given. Simulation and experimental results show the proper operation of the proposed topology and the corresponding control strategy.

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Multilevel Power Conversion - An Overview Of Topologies And Modulation Strategies

Cited by 77 publications

References 60 publications

A New Multilevel Inverter - Hexagram Inverter for Medium-Voltage Adjustable Speed Drive Systems Part I. Six-phase Motor Drive

A New Multilevel Inverter - Hexagram Inverter for Medium-Voltage Adjustable Speed Drive Systems Part I. Six-phase Motor Drive

An Improved Asymmetric Cascaded Multilevel D–STATCOM with Enhanced Hybrid Modulation

A novel voltage balance method for cascaded H-bridge rectifier

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