Adjustable Proportional Hybrid SVPWM Strategy for Neutral-Point-Clamped Three-Level Inverters

Xia, Changliang; Hong-jun, Shao; Zhang, Yun; He, Xiuyu

doi:10.1109/tie.2012.2213558

Cited by 100 publications

(33 citation statements)

References 23 publications

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“…To overcome the drawbacks of the NTV PWM and to achieve full control of the neutral-point voltage, a novel scheme referred to as virtual space vector PWM was presented in [10] and further developed in [8], [9], [13], [15], [16], [25]. The virtual space vector is a linear combination of basic space vectors as shown in Fig.…”

Section: B Ntv 2 Pulse Width Modulationmentioning

confidence: 99%

“…There are some other methods that involve improving the modulation algorithm itself to obtain the NP potential balance. Compared with the hardware approaches, the second type does not need extra equipment and reduces the system size [8]. When the voltages on the dc-link capacitors are not kept constant by external DC sources, the modulations must take over the NP voltage balance by themselves [9].…”

Section: Introductionmentioning

confidence: 99%

“…The nearest-three-vector (NTV) method is one of the most commonly used multilevel space vector pulse width modulation (SVPWM) techniques. It has the advantages of a low switching frequency and good output voltage quality [8]. However, the application of the NTV modulation technique in three level NPC converters causes a low frequency oscillation of the NP potential [10], especially systems operating under a high modulation index and a low power factor [2], [11].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Virtual Space Vector Modulation Strategy for the Neutral-Point Potential Comprehensive Balance of Neutral-Point-Clamped Converters

Zhang¹,

Tang²,

Han³

et al. 2016

Journal of Power Electronics

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A novel Virtual Space Vector (VSV) modulation strategy for complete control of potential neutral point (NP) issues is proposed in this paper. The neutral point potential balancing problems of multi-level converters, which include elimination of low frequency oscillations and self-balancing for NP dc unbalance, are investigated first. Then a set of improved virtual space vectors with dynamic adjustment factors are introduced and a multi-objective optimization algorithm which aims to optimize these adjustment factors is presented in this paper. The improved virtual space vectors and the multi-objective optimization algorithm constitute the novel Virtual Space Vector modulation. The proposed novel Virtual Space Vector modulation can simultaneously recover NP dc unbalance and eliminate low frequency oscillations of the neutral point. Experiment results show that the proposed strategy has excellent performance, and that both of the neutral point potential issues can be solved.

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Section: B Ntv 2 Pulse Width Modulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Virtual Space Vector Modulation Strategy for the Neutral-Point Potential Comprehensive Balance of Neutral-Point-Clamped Converters

Zhang¹,

Tang²,

Han³

et al. 2016

Journal of Power Electronics

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“…The Nearest-three-virtual-vector (NTV 2 ) strategy was first put forward in [12] and then many researchers develop this method [13,14]. The main idea is to synthesize the virtual space vectors, which can produce zero average NP current.…”

Section: Nearest-three-virtual-vectormentioning

confidence: 99%

Improved predictive current control of NPC multilevel inverters

Mao

2016

IEICE Electron. Express

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Abstract:The three-level neutral-point-clamped (NPC) inverter, which is a widely used topology of grid-connected multilevel inverters, suffers the drawback of the NP voltage drift. This paper introduced an improved predictive direct current control strategy to improve grid-connected current quality of the system. The proposed strategy uses the nearest-three-virtualvector (NTV2) modulation strategy which can get rid of the NP voltage balance problem for any range of inverter output voltage. Since the disadvantages of a lot of calculation for NTV2 algorithm in real-time control, the vectors in other sextants are mapped into the first sextant by a simple coordinate transformation. The time derivatives of currents for each selected vectors are used to get the application times that minimize objective function. In addition, comparing with SVPWM approaches the proposed strategy have a constant switching frequency and better line current total harmonic distortion (THD), its validity is verified by the simulation and experiment.

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“…Different modulation techniques were used in the models. These include the Sinusoidal PWM (SPWM) [22], saw-tooth PWM [23], space vector PWM (SVPWM) [24], Third Harmonic Injection PWM with 25% of main carrier (THIPWM(4)) [25], Third Harmonic Injection with a coefficient of 16% of main carrier (THIPWM(6)) [26], Triple Harmonic Injection PWM (TRIPWM) [27], Inverted Sine Carrier PWM (ISCPWM) [28] and Inverted Sine Carrier Third Harmonic Injection PWM (ISCTHIPWM) [29]. These PWM techniques are conventionally used in vehicle applications.…”

Section: Electric Vehicle Drive-train Modelmentioning

confidence: 99%

An Evaluation of Silicon Carbide Unipolar Technologies for Electric Vehicle Drive-Trains

Jahdi

Alatise

Fisher

et al. 2014

IEEE J. Emerg. Sel. Topics Power Electron.

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Adjustable Proportional Hybrid SVPWM Strategy for Neutral-Point-Clamped Three-Level Inverters

Cited by 100 publications

References 23 publications

A Novel Virtual Space Vector Modulation Strategy for the Neutral-Point Potential Comprehensive Balance of Neutral-Point-Clamped Converters

A Novel Virtual Space Vector Modulation Strategy for the Neutral-Point Potential Comprehensive Balance of Neutral-Point-Clamped Converters

Improved predictive current control of NPC multilevel inverters

An Evaluation of Silicon Carbide Unipolar Technologies for Electric Vehicle Drive-Trains

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