An Improved Virtual Space Vector Modulation Scheme for Three-Level Active Neutral-Point-Clamped Inverter

Hu, Cungang; Yu, Xinghuo; Holmes, D.G.; Shen, Weixiang; Wang, Qunjing; Luo, Fang Lin; Liu, Nian

doi:10.1109/tpel.2016.2621776

Cited by 95 publications

(24 citation statements)

References 24 publications

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“…This can control the neutral point (NP) at any modulation index (MI), but it cannot reduce the switching losses or suppress the CM voltage. Therefore, an improved VSVM to reduce the efficiency and switching losses by selecting two pairs of small vectors based on the NP charge and the pulse sequence was developed [16]. The results of the improved VSVM method confirm the flexibility in balancing the NP voltage with different MI.…”

Section: Introductionmentioning

confidence: 84%

Open-Circuit Fault Tolerance Method for Three-Level Hybrid Active Neutral Point Clamped Converters

2020

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Three-level converters are the most important technologies used in high power applications. Among these technologies, active neutral point clamped (ANPC) converters are mainly used for industrial applications. Meanwhile, recent developments have reduced losses and increased efficiency by using a hybrid combination of Si-IGBT and SiC-MOSFET switches to achieve hybrid ANPC (HANPC) converters. Open-circuit failure is regarded as a common and serious problem that affects the operational performance. In this paper, an effective fault-tolerant method is proposed for HANPC converters to safely re-utilize normal operation and increase the reliability of the system under fault conditions. Sequentially, regarding different topologies with reference to earlier fault tolerance methods which could not be applied to the HANPC, the proposed strategy enables continuous operation under faulty conditions effectively without using any additional devices by creating new voltage references, voltage offset, and switching sequences under the faulty conditions. Consequently, no additional costs or changes are associated with the inverter. A detailed analysis of the proposed strategy is presented highlighting the effects on the voltage, currents, and the corresponding total harmonic distortion (THD). The simulation and experimental results demonstrate the capability and effectiveness of the proposed method to maintain normal operation and eliminate the output distortion.

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Section: Introductionmentioning

confidence: 84%

Open-Circuit Fault Tolerance Method for Three-Level Hybrid Active Neutral Point Clamped Converters

2020

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“…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

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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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“…In this paper, the virtual space vector modulation (VSVM) for the AC-DC MC is proposed to reduce the DC current ripples within the whole modulation range. Previously, the VSVM concept was proposed to suppress the common-mode voltage of a two-level voltage source inverter (VSI) [26], and balance the neutral-point potential of a three-level neutral-point-clamped (NPC) inverter [27,28]. However, none of these approaches have been tried to reduce the DC current ripples using the VSVM, at the best knowledge of the authors.…”

Section: Introductionmentioning

confidence: 99%

Reduction of DC Current Ripples by Virtual Space Vector Modulation for Three-Phase AC–DC Matrix Converters

2019

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In this paper, the virtual space vector modulation for the AC–DC (alternating current–direct current) matrix converters is proposed to reduce the DC current ripples in the whole modulation index range. In the proposed method, each virtual vector is synthesized by the two nearest original active vectors. To synthesize the current reference vector, two virtual vectors and one zero vector are used in every switching period. The main principle of the proposed method is to reduce the dwelling period of the largest active current vector in each sector. In addition, the optimized switching patterns are proposed to further reduce the DC current ripples at both high- and low-power operation. Finally, simulation and experimental results are illustrated to validate the effectiveness of the proposed strategy.

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An Improved Virtual Space Vector Modulation Scheme for Three-Level Active Neutral-Point-Clamped Inverter

Cited by 95 publications

References 24 publications

Open-Circuit Fault Tolerance Method for Three-Level Hybrid Active Neutral Point Clamped Converters

Open-Circuit Fault Tolerance Method for Three-Level Hybrid Active Neutral Point Clamped Converters

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

Reduction of DC Current Ripples by Virtual Space Vector Modulation for Three-Phase AC–DC Matrix Converters

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