Improved Y-Source Single-Stage Transformerless Micro-Inverter for PV Residential Applications
Engineering and Technology Journal,
2020, Volume 38, Issue 9, Pages 1327-1341
AbstractY-Source Impedance Network (YSN) is one of the most suitable for providing high voltage gain. It generatesa high voltage gain by using a small shoot-through duty cycle, which makes it suitable in applications require a wide range of input voltages such as the Photovoltaic (PV) power plants. However, traditional (YSNs) are unable to boost low voltages in certain applications to the DC-link voltage (about 400V) since it requires a high number of the turns ratio. Higher turns ratio implies higher leakage inductance resulting in higher DC-link voltage spikes. Also, traditional YSNs have high voltage stresses across the components. In this paper, a developed new transformerless Micro-Inverter (MI) is presented that can overcome all the aforementioned drawbacks. The proposed MI has been developed and designed to eliminate both the leakage inductance due to three-winding coupled transformer and leakage current due to using transformerless MI configuration. In addition, the proposed MI reduced the components' stress significantly and increases the converter voltage gain capability in one single-stage. The proposed high boost ratio transformerless MI is analyzed through the PLECS software simulator and implemented in a small scale MI prototype to ensure the results agree with the analysis and simulation results
 K. Jerin George and K. Muhammedali Shafeeq, “Continuous operation of micro-inverter for constant supply in grid-connected and off-grid operation,” 2014 Int. Conf. Comput. Power, Energy, Inf. Commun. ICCPEIC 2014, pp. 224–228, 2014.
 K. S. Tey and S. Mekhilef, “A reduced leakage current transformerless photovoltaic inverter,” Renew. Energy, vol. 86, pp. 1103–1112, 2016.
 Y. M. Chen and C. Y. Liao, “Three-port flyback-type single-phase micro-inverter with active power decoupling circuit,” IEEE Energy Convers. Congr. Expo. Energy Convers. Innov. a Clean Energy Futur. ECCE 2011, Proc., vol. 2, pp. 501–506, 2011.
 J. Roy and R. Ayyanar, “GaN-based transformer-less microinverter with coupled inductor interleaved boost and half bridge voltage swing inverter,” Conf. Proc. - IEEE Appl. Power Electron. Conf. Expo. - APEC, vol. 2018–March, pp. 381–386, 2018.
 L. Hongpeng, R. Yan, L. Kuan, W. Wei, and X. Dianguo, “A Modified Single-Phase Transformerless Y-Source PV Grid-Connected Inverter,” IEEE Access, vol. XX, no. c, pp. 1–1, 2018.
 Y. P. Siwakoti, F. Blaabjerg, and P. C. Loh, “Quasi-Y-Source Boost DC-DC Converter,” IEEE Trans. Power Electron., vol. 30, no. 12, pp. 6514–6519, 2015.
 X. Ding, Z. Qian, S. Yang, B. Cui, and F. Peng, “A high-performance Z-source inverter operating with small inductor at wide-range load,” Conf. Proc. - IEEE Appl. Power Electron. Conf. Expo. - APEC, pp. 615–620, 2007.
 M. K. Nguyen, Y. C. Lim, and Y. J. Kim, “A modified single-phase quasi-Z-source ac-ac converter,” IEEE Trans. Power Electron., vol. 27, no. 1, pp. 201–210, 2012.
 H. Fathi and H. Madadi, “Enhanced-Boost Z-Source Inverters with Switched Z-Impedance,” IEEE Trans. Ind. Electron., vol. 63, no. 2, pp. 691–703, 2016.
 W. Qian, F. Z. Peng, and H. Cha, “Trans-Z-Source Inverters,” vol. 26, no. 12, pp. 3453–3463, 2011.
 P. C. Loh, D. Li, and F. Blaabjerg, “Γ-Z-Source Inverters Poh,” IEEE Trans. Power Electron., vol. 28, no. 11, pp. 4880–4884, 2013.
 D. Li, P. C. Loh, M. Zhu, F. Gao, and F. Blaabjerg, “Cascaded multicell trans-Z-source inverters,” IEEE Trans. Power Electron., vol. 28, no. 2, pp. 826–836, 2013.
 H. Liu et al., “High Step-Up Y-Source Inverter with Reduced DC-Link Voltage Spikes,” IEEE Trans. Power Electron., vol. 8993, no. c, pp. 1–13, 2018.
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