Reduction of Common-Mode Voltages for Five-Level Active NPC Inverters by the Space-Vector Modulation Technique

Le, Quoc Anh; Lee, Dong-Choon

doi:10.1109/tia.2016.2640200

Cited by 61 publications

(12 citation statements)

References 23 publications

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“…To better explain the proposed LMZV-DPC method, let us consider a case study where the gird VF vector Ψ g is located within sector 1. The closest active vectors to Ψ g are V 16 and V 17 . According to the relationship given in (7), the use of the large vector V 17 will increase the amplitude of both the d-axis and q-axis components of Ψ i k + 1 as shown in Fig.…”

Section: Large Medium Zero Vectors Dpc (Lmzv-dpc)mentioning

confidence: 99%

“…Indeed, due to the lack of galvanic isolation, the high-frequency variation of this voltage induces a leakage current that may circulate to the ground through the leakage capacitor that links the PV cells to the grounded frame. This current worsens the quality of the line current, increases the power conversion system's loss and electromagnetic emissions (EMI), and would shorten the life time of the PV cells [1,[15][16][17]. According to the German standards VDE-0126-1-1, the recommended leakage current amplitude is limited to 300 mA in transformerless PV systems [3].…”

Section: Introductionmentioning

confidence: 99%

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Direct power control with common mode voltage reduction of grid‐connected three‐level NPC inverter

Mahmoud

Hamouda

Khedher

2019

IET Power Electronics

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This paper proposes three new direct power control (DPC) algorithms which minimise the variation of the common mode voltage (CMV) provided by a transformerless grid-connected three-level neutral point clamped (3L-NPC) inverter. The proposed techniques make use of three reduced switching tables designed with the aim to control the active and reactive powers and to minimise the variation of the CMV. The first switching table uses large, medium and zero vectors of the space vector diagram; it is therefore named large medium zero vectors DPC. The second table uses the medium and zero vectors. It is referred to as medium zero vectors DPC. The third one namely medium vectors DPC, uses only medium vectors. Numerical simulations and experimental tests carried out on a laboratory prototype of the 3L-NPC inverter confirm the feasibility and effectiveness of the proposed algorithms.

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Section: Large Medium Zero Vectors Dpc (Lmzv-dpc)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct power control with common mode voltage reduction of grid‐connected three‐level NPC inverter

Mahmoud

Hamouda

Khedher

2019

IET Power Electronics

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“…Therefore, it is necessary to suppress CMV. The method of suppression is mainly focused on the structure of the machine, the structure of the converter, the modulation algorithm and the design of the filter [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Six‐phase SVPWM with common‐mode voltage suppression

Zheng

Rong

et al. 2018

IET Power Electronics

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There are two common-mode voltages (CMVs) in a six-phase machine with two Y-connected windings shifted by 30°, which bring adverse effects on the six-phase system. In this study, a method of six-phase space vector pulse width modulation (SVPWM) is proposed, which can suppress the magnitude and frequency of the two CMVs. First, all basic vectors are divided into 16 classes, from which two classes of basic vectors are selected. With these two classes of basic vectors, some auxiliary vectors are constructed according to an optimisation model. Then a reference vector is synthesised by using these auxiliary vectors. There are two kinds of synthesis schemes, single-class synthesis and two-class synthesis. Finally, optimal sequences of the basic vectors that play a role in each switching period are obtained. The experimental results show that the peak-to-valley value of CMV is only one-third of the DC-bus voltage of the converter in the two-class synthesis, and the frequency of CMV is only three times of the line voltage fundamental frequency, which is far below the switching frequency of the converter.

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“…The Space Vector Modulation (SVM) scheme offers attractive features and both two and three-dimensional versions are widely known and applied [28][29][30][31][32][33][34][35]. However, for an MMCC having many voltage levels per phase, using conventional SVM technique, the number of switching states escalates, and on-line switching vector selection and duty cycle calculation become complicated [36][37][38].…”

mentioning

confidence: 99%

“…Calculation of selected vector duty cycle and selection of switching states can then be carried out as in a two level inverter. Extension of this approach to five-level space vector plane has also been attempted, and meanwhile optimal switching sequence for achieving good harmonic performance and capacitor voltage balance has been proposed [31][32][33][34]. The main problem with the space vector plane division approach lies in the use of lookup tables for generating the gate pulses for the switching devices.…”

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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Reduction of Common-Mode Voltages for Five-Level Active NPC Inverters by the Space-Vector Modulation Technique

Cited by 61 publications

References 23 publications

Direct power control with common mode voltage reduction of grid‐connected three‐level NPC inverter

Direct power control with common mode voltage reduction of grid‐connected three‐level NPC inverter

Six‐phase SVPWM with common‐mode voltage suppression

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

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