OPERATION AND ANALYSIS OF MODIFIED QZSI IN DCM AND CCM
This paper presents a new functional, powered boost adjusted inverter with improved voltage gain by incorporating an anti-parallel switch with a capacitor that allows two operating modes. These are Continuous Mode of Conduction and Discontinuous Operating Mode. In the proposed qZSI voltage gain is significantly increased without the use of passive components by adding auxiliary switch. The two operating modes are distinguished by varying switched capacitor qZSI inductances and load conditions. The improvement potential of the proposed CC-qZSI can be expanded further (n-stages) by connecting Diodes and Capacitors in n No.of stages. The limiting conditions for CCM / DCM were derived. Detailed analysis of the voltage control power, current inductance ripples, stresses and converter losses on switching devices for CCM and DCM has been carried out. Both modes of operation are simulated and experimentally verified and validated.
 Y. Xue, L. Chang, S. B. Kjaer, J. Bordonau, and T. Shimizu, “Topologies of single-phase inverters for small distributed power generators: An overview,” IEEE Trans. Power Electron., vol. 19, no. 5,pp. 1305–1314, Sep. 2004.
 N. Mohan, W. P. Robbin, and T. M. Undeland, Power Electronics:Converters, Applications, and Design, 2nd ed. Hoboken, NJ, USA:Wiley, 1995.
 G. F. Reed et al., “Applications of voltage source inverter (VSI) based technology for FACTS and custom power installations,” in Proc. Int. Conf. Power Syst. Technol. (PowerCon), vol. 1. Perth, WA, Australia, Dec. 2000, pp. 381–386.
 K. Temma, F. Ishiguro, N. Toki, I. Iyoda, and J. J. Paserba, “Clarification and measurements of high frequency harmonic resonance by a voltage sourced converter,” IEEE Trans. Power Del., vol. 20, no. 1, pp. 450–457,Jan. 2005.
 Y. Liu, H. Abu-Rub, B. Ge, F. Blaabjerg, O. Ellabban, and P. C.Loh, Impedance Source Power Electronic Converters, vol. 1. Hoboken,NJ, USA: Wiley, 2016.
 A. K. Rathore, A. K. S. Bhat, and R. Oruganti, “Analysis, design and experimental results of wide range ZVS active-clamped L-L type current-fed DC/DC converter for fuel cells to utility interface,” IEEETrans. Ind. Electron., vol. 59, no. 1, pp. 473–485, Jan. 2012.
 P. Xuewei and A. K. Rathore, “Novel bidirectional snubberless naturally commutated soft-switching current-fed full-bridge isolated DC/DC converter for fuel cell vehicles,” IEEE Trans. Ind. Electron., vol. 61, no. 5, pp. 2307–2315, May 2014.
 U. R. Prasanna and A. K. Rathore, “Analysis, design, and experimental results of a novel soft-switching snubberless current-fed half-bridge front-end converter-based PV inverter,” IEEE Trans. Power Electron., vol. 28, no. 7, pp. 3219–3230, Jul. 2013.
 A. D. Kiadehi, K. El Khamlichi Drissi, and C. Pasquier, “Angular modulation of dual-inverter fed open-end motor for electrical vehicle applications,” IEEE Trans. Power Electron., vol. 31, no. 4,pp. 2980–2990, Apr. 2016.
 D. Sun et al., “Modeling, impedance design, and efficiency analysis of quasi-Z source module in cascaded multilevel photovoltaic power system,” IEEE Trans. Ind. Electron., vol. 61, no. 11, pp. 6108–6117, Nov. 2014.
 H. Abu-Rub, A. Iqbal, S. M. Ahmed, F. Z. Peng, Y. Li, and G. Baoming, “Quasi-Z-source inverter-based photovoltaic generation system with maximum power tracking control using ANFIS,” IEEE Trans. Power Electron., vol. 4, no. 1, pp. 11–20, Jan. 2013.
 O. Ellabban, H. Abu-Rub, and S. Bayhan, “Z-source matrix converter:An overview,” IEEE Trans. Power Electron., vol. 31, no. 11,pp. 7436–7450, Nov. 2016.
 F. Z. Peng et al., “Z-source inverter for motor drives,” IEEE Trans.Power Electron., vol. 20, no. 4, pp. 857–863, Jul. 2005.
 X. Li, C. Xia, Y. Cao, W. Chen, and T. Shi, “Commutation torque ripple reduction strategy of Z-source inverter fed brushless DC motor,” IEEE Trans. Power Electron., vol. 31, no. 11, pp. 7677–7690,Nov. 2016.
 D. Sri Vidhya and T. Venkatesan, “Quasi-Z-source indirect matrix converter fed induction motor drive for flow control of dye in paper mill,”IEEE Trans. Power Electron., vol. 33, no. 2, pp. 1476–1486, Feb. 2018.
 F. Z. Peng, “Z-source inverter,” IEEE Trans. Ind. Appl., vol. 39, no. 2,pp. 504–510, Mar./Apr. 2003.
 A. Ravindranath, S. K. Mishra, and A. Joshi, “Analysis and PWM control of switched boost inverter,” IEEE Trans. Ind. Electron., vol. 60,no. 12, pp. 5593–5602, Dec. 2013.
 J. Anderson and F. Z. Peng, “Four quasi-Z-source inverters,” in Proc.PESC, Rhodes, Greece, Jun. 2008, pp. 2743–2749.
 S. S. Nag and S. Mishra, “Current-fed switched inverter,” IEEE Trans.Ind. Electron., vol. 61, no. 9, pp. 4680–4690, Sep. 2014.