Virtual-Space-Vector PWM for a Three-Level Neutral-Point-Clamped Inverter With Unbalanced DC-Links

Wu, Xiang; Tan, Guojun; Ye, Zongbin; Yao, Guangyao; Li, Zhan; Liu, Guanghui

doi:10.1109/tpel.2017.2692272

Cited by 92 publications

(34 citation statements)

References 34 publications

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“…Several single-phase multilevel inverter topologies were proposed in the literature, and among them, the most famous ones are as follows: flying capacitor (FC), 18 cascaded Hbridge (CHB), 19 neutral point clamped (NPC), 20 and packed U cells (PUC). First, a large filter could be employed to mitigate the harmonics and produce a low THD signal.…”

Section: Single-phase Inverter Designmentioning

confidence: 99%

“…Therefore, the best approach to minimize the filter size while using a medium switching frequency is to use multilevel inverter topologies. Several single-phase multilevel inverter topologies were proposed in the literature, and among them, the most famous ones are as follows: flying capacitor (FC), 18 cascaded Hbridge (CHB), 19 neutral point clamped (NPC), 20 and packed U cells (PUC). 21 The main differences between them lie in the number of components for additional levels and their optimal control strategies.…”

Section: Single-phase Inverter Designmentioning

confidence: 99%

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Mitigation of voltage imbalance in power distribution system using MPC‐controlled packed‐U‐cells converter

Ahmed

Al‐Emadi

Gastli

et al. 2019

Energy Science & Engineering

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Delivering high power quality in single‐phase distribution has witnessed more challenges especially with the increased penetration of single‐phase distributed generation (DG). This paper proposes a smart solid‐state‐based transformer, which aims to replace traditional ones, for single‐phase distribution laterals, and provide load balancing and protection to the three‐phase main feeders, that is based on connecting the single‐phase lateral to the three‐phase main feeder through a power electronics converter. This converter transfers balanced power from and to the three‐phase feeder while automatically regulating the lateral single‐phase voltage, hence, assuring high power quality without requiring any transformer on‐load tap changer. A 7‐level packed‐U‐cells (PUC) single‐phase inverter topology was used to deliver single‐phase regulated sinusoidal voltage to the AC loads, and at the same time, it is able to deliver DC power to DC loads. The simulation and hardware‐in‐the‐loop (HIL) results have shown that the proposed topology delivers high power quality for both AC and DC loads under different operating scenarios. Moreover, the converter can play the role of a solid‐state protection device coordinated with other up‐ and downstream protective devices. Finally, this system can be integrated within the smart grid allowing more flexibility for automation and efficient control of the grid.

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Section: Single-phase Inverter Designmentioning

confidence: 99%

Section: Single-phase Inverter Designmentioning

confidence: 99%

Mitigation of voltage imbalance in power distribution system using MPC‐controlled packed‐U‐cells converter

Ahmed

Al‐Emadi

Gastli

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…Instead of changing hardware, the control algorithms have been used to control the NP in the converters [8]. These control algorithms are generally based on a variety of pulse width modulation (PWM) methods, such as carrier-based sinusoidal PWM (SPWM) [9,10], space vector (SV) PWM [11][12][13], selective harmonic elimination (SHE) PWM [14].…”

Section: Introductionmentioning

confidence: 99%

Neutral-Point Potential Balancing Control Strategy for Three-Level ANPC Converter Using SHEPWM Scheme

Zhang

Wang

et al. 2019

Energies

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A selective harmonic elimination pulse width modulation (SHEPWM) control strategy is proposed to balance the neutral-point potential (NP) of a three-level active neutral-point-clamped (ANPC) converter. In this strategy, the chaotic ant colony algorithm (ACA) is adopted to solve the SHEPWM nonlinear equations, which does not require presetting the initial values of solutions and can get multiple solutions in the same modulation index. The influence of different solutions corresponding to the SHEPWM switching states on the NP is different, namely, some make the NP increase and others make the NP decrease. Therefore, the NP balancing can be effectively controlled by choosing appropriate solutions in different fundamental periods. The simulation and experimental results further verify the feasibility and effectiveness of the control strategy.

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“…To address the distorted output voltage and current due to unbalanced DC-link, several modulation techniques have been developed for 3 levels (3L)-NPC converter based on CBPWM with appropriate zero-sequence component injection or modified SVM [16][17][18][19]. The SVM presented in [16] is based on a complex space vector diagram causing time-consuming calculation of the duty cycles.…”

Section: Introductionmentioning

confidence: 99%

“…The approach of zero-sequence presents some complications for the generalization and the implementation of the modulation strategy [17]. New and interesting approaches are proposed in [18,19] aiming at implementing a fast-processing method to calculate the duty cycles on the basis of virtual output voltage space vectors.…”

Section: Introductionmentioning

confidence: 99%

Induction Motor Drives Fed by an NPC Inverter with Unbalanced DC-Link

et al. 2019

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Neutral Point Clamped (NPC) converters with n levels are traditionally controlled in such a way that the DC-link capacitors operate at 1/(n−1) of the total DC-link voltage level. The voltage level across the DC-link capacitors has to be properly regulated by the capacitor unbalance control to contain the harmonic distortion of the converter output voltages. State-of-the-art modulation techniques address the problem of the DC-link voltage regulation for NPC inverters. However, they highly show reduced performance when unbalanced DC-link voltages are considered. In this paper, a novel Space Vector Modulation (SVM) is proposed for NPC converters with an unbalanced DC-link. At every modulation interval, the technique defines the optimal switching pattern by considering the actual unbalanced DC-link conditions. The proposed modulation allows improving the harmonic content of the NPC converter output voltage with respect to a traditional ML-SVM, when the same operating conditions are considered. As an extension, the proposed modulation technique will guarantee the same output voltage quality of a traditional ML-SVM with unbalanced DC-link, while improving the conversion efficiency thanks to a reduction of switching frequency.

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Virtual-Space-Vector PWM for a Three-Level Neutral-Point-Clamped Inverter With Unbalanced DC-Links

Cited by 92 publications

References 34 publications

Mitigation of voltage imbalance in power distribution system using MPC‐controlled packed‐U‐cells converter

Mitigation of voltage imbalance in power distribution system using MPC‐controlled packed‐U‐cells converter

Neutral-Point Potential Balancing Control Strategy for Three-Level ANPC Converter Using SHEPWM Scheme

Induction Motor Drives Fed by an NPC Inverter with Unbalanced DC-Link

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