This paper proposes a nine-level PWM gridconnected photovoltaic inverter for single-phase applications. The basic structure relies on two cascaded full-bridges supplied with different voltage levels. A flying capacitor provides the power supply for the lower voltage full-bridge. In order to increase the efficiency and keep the ground leakage current under control, a specific PWM strategy was developed and an additional leakage current reduction circuit was added to the basic structure of the cascaded full-bridge. Moreover, the regulation of the flying capacitor voltage is taken into account. Simulations and experimental results confirm the good performance of the proposed solution.
This paper proposes a nine-level PWM grid-connected photovoltaic inverter for single-phase applications. The basic structure relies on two cascaded full-bridges supplied with different voltage levels. A flying capacitor provides the power supply for the lower voltage full-bridge. In order to increase the efficiency and keep the ground leakage current under control, a specific PWM strategy was developed and an additional leakage current reduction circuit was added to the basic structure of the cascaded full-bridge. Moreover, the regulation of the flying capacitor voltage is taken into account. Simulations and experimental results confirm the good performance of the proposed solution. © 2012 IEEE.
A Nine-Level Grid-Connected Photovoltaic Inverter Based on Cascaded Full-Bridge with Flying Capacitor / Buticchi, G.; Concari, C.; Franceschini, G.; Lorenzani, E.; Zanchetta, P.. - ELETTRONICO. - (2012), pp. 1149-1156. ( 4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012 Raleigh, NC, USA 15-20 Sept. 2012) [10.1109/ECCE.2012.6342688].
A Nine-Level Grid-Connected Photovoltaic Inverter Based on Cascaded Full-Bridge with Flying Capacitor
G. Buticchi;G. Franceschini;E. Lorenzani;
2012
Abstract
This paper proposes a nine-level PWM grid-connected photovoltaic inverter for single-phase applications. The basic structure relies on two cascaded full-bridges supplied with different voltage levels. A flying capacitor provides the power supply for the lower voltage full-bridge. In order to increase the efficiency and keep the ground leakage current under control, a specific PWM strategy was developed and an additional leakage current reduction circuit was added to the basic structure of the cascaded full-bridge. Moreover, the regulation of the flying capacitor voltage is taken into account. Simulations and experimental results confirm the good performance of the proposed solution. © 2012 IEEE.
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