Single Phase Asymmetric Switched-Inductor Quasi-Z-Source CHB Multilevel Inverter
Asymmetric Switched-Inductor Quasi-Z-Source Cascaded H-Bridge Multilevel Inverter (A-SL-qZS-CHB-MLI) with seven-level high-boosted load voltage is discussed in this article. Each unit of the proposed A-SL-qZS-CHB-MLI is comprised of a Quasi-Z-Source (qZS)
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Abstract Asymmetric Switched-Inductor Quasi-Z-Source Cascaded H-Bridge Multilevel Inverter (A-SL-qZS-CHB-MLI) with seven-level high-boosted load voltage is discussed in this article. Each unit of the proposed A-SL-qZS-CHB-MLI is comprised of a Quasi-Z-Source (qZS) network with SL cell and H-Bridge unit. The SL cell is formed with three diodes and two inductors. The qZS network facilitates the operation of shoot-through (ST) state control to provide boosted output voltage. The inclusion of SL cell increases the boosted output for the same ST duty ratio as compared with conventional qZS-CHB-MLI. The performance analysis of this topology in connection with THD for load voltage obtained from simple boost control and multicarrier PWM method is presented. Simulation results obtained from the proposed A-SL-qZS-CHB-MLI reveals high boost output voltage with reduced THD as compared with the traditional qZS-CHB-MLI.
G. Prem Sunder (&) Department of Electrical and Electronics Engineering, Mailam Engineering College, Mailam, Tamil Nadu, India e-mail: [email protected] B. Shanthi Centralized Instrumentation and Service Laboratory, Annamalai University, Chidambaram, Tamil Nadu, India e-mail: [email protected] Alamelu Nachiappan Department of Electrical and Electronics Engineering, Pondicherry Engineering College, Pondicherry, India e-mail: [email protected] S.P. Natarajan Department of Electronics and Instrumentation Engineering, Annamalai University, Chidambaram, Tamil Nadu, India e-mail: [email protected] P. Sanjeevikumar Department of Electrical and Electronics, University of Johannesburg, Auckland Park, Johannesburg, South Africa e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2018 A. Garg et al. (eds.), Advances in Power Systems and Energy Management, Lecture Notes in Electrical Engineering 436, https://doi.org/10.1007/978-981-10-4394-9_29
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Keywords Quasi-Z-Source network Switched-inductor cell Simple boost control Multicarrier PWM THD
CHB-MLI
1 Introduction In recent research works, many of the researches focused on renewable energy power generation systems. Unfortunately, the input voltage obtained from the renewable energy sources is sometimes low, discontinuous and affected by the environment. Multilevel inverters are effectively employed in power-conversion systems for high-power applications [1, 2]. The CHB multilevel inverters are readily utilized in renewable energy applications as it provides output voltage with reduced THD using multiple input dc voltage sources. The CHB-MLI has reduced number of switches in its configuration as compared with diode-clamped- and capacitor-clamped MLIs for a given number of voltage levels [3]. The CHB-MLIs can only provide the summation of the input voltages, but have no voltage boosting capability. Impedance-source networks (Z-Source networks) are extensively used to increase boost ability of the inverters. Quasi-ZS network is the improvement of the ZS network for providing improved reliability as well
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