Investigation on cascade multilevel inverter with symmetric, asymmetric, hybrid and multi-cell configurations

Suresh, Y.; Venkataramanaiah, J.; Panda, Anup Kumar; Dhanamjayulu, C.; Venugopal, Prakash

doi:10.1016/j.asej.2016.09.006

Cited by 41 publications

(13 citation statements)

References 14 publications

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“…Circuit diagrams as illustrated before in Fig. 2 are still applicable for 17-L operation, except the magnitude of DC sources are governed by (6), and the states are different.…”

Section: Asymmetrical DC Sourcesmentioning

confidence: 99%

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Multilevel inverter with improved basic unit structure for symmetric and asymmetric source configuration

Hamidi

Ishak

Zainuri

et al. 2020

IET Power Electronics

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An improved multilevel inverter (MLI) topology using a new basic unit structure with a reduced number of components is proposed in this study. Its single compact module is made up of two basic units connected to the left and right sides of a packed H-bridge. The topology produces 9-Level output when operated symmetrically and 17-Level output when operated asymmetrically. Identical magnitude of DC sources is used for the symmetrical operation, while non-identical magnitudes in a trinary sequence are used for the asymmetrical operation. The low-frequency modulation scheme is applied for the switching control where the switching angles are pre-calculated. The mathematical formulations for the switching are also considered to reduce the total harmonic distortion (THD) at the output. The proposed topology is also found to be superior in terms of the required number of switches per output level and total blocking voltage compared to conventional and recently reported MLIs. With these merits, real-time installation of the proposed topology will potentially require lesser space and become cheaper. The feasibility of the proposed topology is validated for its 9-Level and 17-Level operations through experimental verification on output characteristics, THD, blocking voltage, power-sharing and efficiency.

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“…Circuit diagrams as illustrated before in Fig. 2 are still applicable for 17-L operation, except the magnitude of DC sources are governed by (6), and the states are different.…”

Section: Asymmetrical DC Sourcesmentioning

confidence: 99%

“…Among the three, CHB is the only topology that utilises isolated input sources. This enables the topology to utilise different source configurations such as the symmetrical and asymmetrical configurations [6].…”

Section: Introductionmentioning

confidence: 99%

Multilevel inverter with improved basic unit structure for symmetric and asymmetric source configuration

Hamidi

Ishak

Zainuri

et al. 2020

IET Power Electronics

View full text Add to dashboard Cite

show abstract

“…A survey of topologies, controls and applications of multilevel inverters was done in 2002 [3]. The investigation of cascaded MLIs with asymmetric, symmetric, multi-cell and hybrid configurations were presented in [4]. In which, a new symmetric dc-source hybrid MLI topology with minimal number of switch counts was proposed [5].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Implementation of a 31-Level Asymmetrical Cascaded Multilevel Inverter for Dynamic Loads

et al. 2019

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Among the renewable energy applications, the most popular inverters are cascaded multilevel inverters. Irrespective of numerous benefits these inverters face reliability issues due to the presence of more circuit components in the design. This has been a critical challenge for researchers in designing inverters with enhanced reliability by reducing the total harmonic distortion (THD). This paper proposes a 31-level asymmetric cascaded multilevel inverter for renewable energy applications. The proposed topology produces waveforms consisting of the staircase with a high number of output levels with lesser components with low THD. The investigations on the feasibility and performance of MLI under steady-state, transient, and dynamic load disturbances. The results are validated from a 1.6kW system which provides the proposed inverter.INDEX TERMS Multilevel inverter (MLI), total harmonic distraction (THD), staircase modulation technique.

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“…Symmetrical DC source configuration requires identical values of DC sources, while asymmetrical DC source configuration uses different value of DC sources selected either by the binary or trinary method [11]. For the same number of switching devices used, the asymmetrical configuration is able to produce a higher number of output levels [12]. To the best of authors knowledge and from the literature review done, comparative analysis on the symmetrical and asymmetrical configurations of the MLDCL inverter is still inadequate to fully understand the operation of the topology especially in terms of power sharing at each power stages of the topology.…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of multilevel DC link inverter using symmetrical and asymmetrical DC sources

Hamidi

Ishak

Zainuri

2019

Journal of Electrical Engineering

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This paper presents a comparative evaluation of multilevel DC link inverter of photovoltaic (PV) renewable energy system using either symmetrical or asymmetrical dc sources. The four units of dc source can have the same dc voltage level, ie 81.32 V, resulting in symmetrical dc sources. The asymmetrical dc sources consist of input dc voltages in binary sequence, 21.68 V, 43.37 V, 86.74 V and 173.48 V. The boost converters with maximum power point tracking (MPPT) capability which is regulated by perturb and observe (P&O) based control are connected between the PV panels and the four dc sources. The varying dc voltages from the PV panels are regulated to track the maximum power available regardless of the irradiance and temperature conditions. The symmetrical dc sources will facilitate the generation of 9 levels of staircase ac waveform rms of 230 V after the H-bridge inverter. Whereas, the asymmetrical dc sources are able to produce 31 levels of staircase ac waveform also with rated rms 230 V. Detailed analysis and comparison on the powers, ac output voltage, output current, total harmonic distortions, and MPPT achievement are described.

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Investigation on cascade multilevel inverter with symmetric, asymmetric, hybrid and multi-cell configurations

Cited by 41 publications

References 14 publications

Multilevel inverter with improved basic unit structure for symmetric and asymmetric source configuration

Multilevel inverter with improved basic unit structure for symmetric and asymmetric source configuration

Real-Time Implementation of a 31-Level Asymmetrical Cascaded Multilevel Inverter for Dynamic Loads

Comparative evaluation of multilevel DC link inverter using symmetrical and asymmetrical DC sources

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