An overlapping multi-hexagon space vector modulation scheme for modular multilevel cascade converters

Efika, Ikenna; Zhang, Li; Watson, Alan J.; Clare, John

doi:10.1109/epe.2013.6634486

Cited by 6 publications

(7 citation statements)

References 7 publications

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“…Modulation controls for this topology have already been investigated in detail in [5,6] and phase Shift PWM control will be discussed here in brief. For this investigation a unipolar phase-shifted PWM (PS-PWM) scheme is applied for the MMFCC-STATCOM.…”

Section: Phase Shift Pwm For Mmfcc-statcommentioning

confidence: 99%

“…So far in literature no work has been published on STATCOM with this configuration. Some work has been done with regards to investigating the converter structures for high power applications and pulse width modulation and space vector schemes [5][6][7]whilst most of other STATCOM schemes implemented focus mainly on the Cascaded Hbridge MMCC topology [4,8,9].…”

Section: Introductionmentioning

confidence: 99%

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Reactive Power Compensation by Modular Multilevel Flying Capacitor Converter-Based STATCOM Using PS-PWM

Efika¹,

Nwobu²,

Zhang³

2014

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

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This paper presents a simulation study into the implementation of a modular multi-level flying capacitor converter as a STATCOM. The converter modulation scheme applied is based on Phase Shifted PWM and the two scenarios which require compensation are investigated to verify this topology. The two scenarios are PCC voltage regulation through reactive power compensation and power oscillation damping through reactive current compensation. Simulation results verify the performance of the chosen topology.

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Section: Phase Shift Pwm For Mmfcc-statcommentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reactive Power Compensation by Modular Multilevel Flying Capacitor Converter-Based STATCOM Using PS-PWM

Efika¹,

Nwobu²,

Zhang³

2014

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

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“…Besides these two types, current developments in MMCC topologies also consider other structures, particularly the 5-level NPC (5L-NPC) and 5-level FC (5L-FC) types [13,[16][17][18][19] and their hybrid combinations. The advantages of these 5-level modules are that they offer more switching states and voltage levels per module, hence with the same number of modules as when using 3L-FBs, the converter output voltage is higher and harmonic performance is better.…”

mentioning

confidence: 99%

Control of Modular Multilevel Converters Using an Overlapping Multihexagon Space Vector Modulation Scheme

Oghorada

Zhang

Efika

et al. 2019

IEEE J. Emerg. Sel. Topics Power Electron.

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Adapting the conventional Space Vector modulation (SVM) scheme for modular multilevel cascaded converters is complicated as the number of switching vectors increases with the number of voltage levels. This paper introduces a novel SVM scheme that can be applied for the control of modular multilevel cascade converters (MMCC) with any number of levels. Instead of extending a single hexagon to the regions corresponding to the number of levels, the proposed method treats the three-phase MMCC as multiple inverters with a phase limb being a chain of basic three level H-bridge, five-level flying capacitor, or neutral point clamped inverters. Basic two or three level hexagons can be applied to determine the switch states and duty cycles separately within one tier of the converter and many such hexagons can be overlapped, with phase shift relative to each other, for the control of a complete MMCC. This approach simplifies the modulation algorithm and brings flexibility in shaping the output voltage waveforms for different applications. Simulation results confirm the good waveform performance of this scheme. An experimental 5-level MMCC, with a total of six H-bridges as the basic modules, is presented to validate the advantageous features of the method.

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“…This paper presents a new STATCOM for unbalanced load compensation using a variant of the SSBC-MMCC [10] known as the single star flying capacitor converter MMCC (SSFCC-MMCC). Each module is a basic single phase three-level full bridge flying capacitor converter (3L-FCC) which synthesizes three voltage levels (0, ±0.5VDC, ±VDC) [11]. Comparing to the MMCC using H-bridge cells the main advantage of this topology is having more degrees of freedom in control at the sub-module level, hence it is more flexible for converters requiring high performance dynamic control.…”

Section: Introductionmentioning

confidence: 99%

Control of a Single-Star Flying Capacitor Converter Modular Multi-level Cascaded Converter (SSFCC-MMCC) STATCOM for Unbalanced Load Compensation

Oghorada

Nwobu

Zhang

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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This paper presents a simulation study into the implementation of the single star flying capacitor converter modular multi-level cascaded converter (SSFCC-MMCC) as a STATCOM for unbalanced load compensation. The paper proposes a new concept of voltage source current control for the reference current tracking of the compensated currents. This control strategy enables the STATCOM system to compensate for both positive sequence reactive and negative sequence currents. Not only compensates for unbalanced load, but also keep the module Dc-link and flying capacitor voltages maintained at their rated values. Simulation results verify the performance of the chosen topology.

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An overlapping multi-hexagon space vector modulation scheme for modular multilevel cascade converters

Cited by 6 publications

References 7 publications

Reactive Power Compensation by Modular Multilevel Flying Capacitor Converter-Based STATCOM Using PS-PWM

Reactive Power Compensation by Modular Multilevel Flying Capacitor Converter-Based STATCOM Using PS-PWM

Control of Modular Multilevel Converters Using an Overlapping Multihexagon Space Vector Modulation Scheme

Control of a Single-Star Flying Capacitor Converter Modular Multi-level Cascaded Converter (SSFCC-MMCC) STATCOM for Unbalanced Load Compensation

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