Multilevel Power Converters: A Survey

Kumar, Atul; Kumar, K. Ramash; Vardan, R.H.; Banakara, Basavaraja

doi:10.47893/ijpsoem.2013.1096

Cited by 4 publications

(1 citation statement)

References 91 publications

(79 reference statements)

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“…The harmonics which are needed to be removed is included in the carrier signal which helps to eliminate the corresponding harmonic elements from PWM pulse. Though SHE PWM eliminates the harmonics, it has few drawbacks like slower reaction during transient conditions, switching angle needs to be maintained below π/2, pre-defined calculations are required etc., [216][217][218][219]. To overcome all these issues, the SVM technique [34] is introduced which also provides the balancing of DC-link voltages and reduction of common mode voltages along with harmonic reduction [35]- [38].…”

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A Comprehensive Review on Space Vector Modulation Techniques for Neutral Point Clamped Multi-Level Inverters

2021

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The Neutral Point Clamped (NPC) Multi-Level Inverters (MLI) have been ruling the power electronics industries for the past two decades. The Multi-Carrier Pulse Width Modulation (MCPWM) is common PWM techniques which are widely used in NPC-MLI applications. However, MCPWM is not having a good impact on the balancing of DC-link voltages, Common Mode Voltage (CMV) and limiting the Total Harmonics Distortion (THD). The Selective Harmonic Elimination (SHE) technique is introduced for reducing the THD, however all the switching angles should be maintained less than π/2 to keep the eliminated harmonics at constant level which narrows down the modulation index range. Hence, in recent days Space Vector Modulation (SVM) technique is widely used in NPC-MLI, which gives better DC-link voltage balancing, self-neutral point balancing, near-zero CMV reduction, better-quality harmonics profile and switching loss minimization. Hence, it is a preferred solution for the majority of electrical conversion applications such as electric traction, high power industrial drives, renewable power generation, and gridconnected inverters, etc. The paper gives a comprehensive review of the SVM for NPC-MLI. First, this paper deliberates the state of art for two-level SVM and extends it to three-level (3L) SVM. Also compares the 3L SVM performance with other MCPWM techniques. Followed by the various modified MLI SVM techniques in terms of their implementations, DC-link capacitor balancing, and reduction of CMV. Further, the review of MLI SVM is widened to open-end winding Inverters and multiphase MLIs. The final part of this paper discussed the future trends and research directions on MLI SVM techniques and its applications.

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