Realization of a Generalized Switched-Capacitor Multilevel Inverter Topology with Less Switch Requirement

Anzar Ahmad, Anas Mu, Adil Sarwar, Mohammad Zaid, Mohd Tariq, Javed Ahmad and Abdul R. Beig
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Anzar Ahmad: Department of Electrical Engineering, ZHCET, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
Anas Mu: Department of Electrical Engineering, ZHCET, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
Adil Sarwar: Department of Electrical Engineering, ZHCET, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
Mohammad Zaid: Department of Electrical Engineering, ZHCET, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
Mohd Tariq: Department of Electrical Engineering, ZHCET, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
Javed Ahmad: Department of Electrical Engineering, ZHCET, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
Abdul R. Beig: Advanced Power and Energy Center, Department of Electrical and Computer Engineering, Khalifa University, Abu Dhabi 127788, UAE

Energies, 2020, vol. 13, issue 7, 1-21

Abstract: Conventional multilevel inverter topologies like neutral point clamped (NPC), flying capacitor (FC), and cascade H bridge (CHB) are employed in the industry but require a large number of switches and passive and active components for the generation of a higher number of voltage levels. Consequently, the cost and complexity of the inverter increases. In this work, the basic unit of a switched capacitor topology was generalized utilizing a cascaded H-bridge structure for realizing a switched-capacitor multilevel inverter (SCMLI). The proposed generalized MLI can generate a significant number of output voltage levels with a lower number of components. The operation of symmetric and asymmetric configurations was shown with 13 and 31 level output voltage generation, respectively. Self-capacitor voltage balancing and boosting capability are the key features of the proposed SCMLI structure. The nearest level control modulation scheme was employed for controlling and regulating the output voltage. Based on the longest discharging time, the optimum value of capacitance was also calculated. A generalized formula for the generation of higher voltage levels was also derived. The proposed model was simulated in the MATLAB ® /Simulink 2016a environment. Simulation results were validated with the hardware implementation.

Keywords: multilevel inverter (MLI); switch count; switched-capacitor cell; capacitor voltage balancing (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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