A SPWM Full Bridge Inverter With Transformerless PV Grid Connected Inverter

K Ravikumar, K.E.Ch. Vidyasagar, Hidayathulla Patnam, Ponnaganti Siva Ramakrishna

Abstract


Unipolar sinusoidal pulse width modulation (SPWM) full-bridge inverter brings high-frequency common-mode voltage, which restricts its application in transformer less photovoltaic grid-connected inverters. In order to solve this problem, an optimized full-bridge structure with two additional switches and a capacitor divider is proposed in this paper, which guarantees that a freewheeling path is clamped to half input voltage in the freewheeling period. Sequentially, the high-frequency common mode voltage has been avoided in the Unipolar SPWM full-bridge inverter, and the output current flows through only three switches in the power processing period. In addition, a clamping branch makes the voltage stress of the added switches be equal to half input voltage. The operation and clamping modes are analyzed and the total losses of power device of several existing topologies and proposed topology are fairly calculated. Finally, the common mode performance of these topologies is compared by a universal prototype inverter rated at 1 KW.


Keywords


SPWM, transformer less, unipolar

References


European Photovoltaic Industry Association. (2011, May). Global market outlook for photovoltaics until 2015 [Online]. Available: http://www.epia.org

T. Kerekes, R. Teodorescu, P. Rodr´ıguez, G. V´azquez, and E. Aldabas, “A new high-efficiency single-phase transformerless PV inverter topology,”

IEEE Trans. Ind. Electron., vol. 58, no. 1, pp. 184–191, Jan. 2011.

H. Xiao and S. Xie, “Transformerless split-inductor neutral point clamped three-level PV grid-connected inverter,” IEEE Trans. Power Electron.,

vol. 27, no. 4, pp. 1799–1808, Apr. 2012.

H. Cha and T.-K. Vu, “Comparative analysis of low-pass output filter for single-phase grid-connected Photovoltaic inverter,” in Proc. 25th Annu. IEEE Appl. Power Electron. Conf. Expos., 2010, pp. 1659–1665.

M. Liserre, F. Blaabjerg, and S. Hansen, “Design and control of an LCLfilter-based three-phase active rectifier,” IEEE Trans. Ind. Appl., vol. 41,no. 5, pp. 1281–1291, Sep. 2005.

O. Haillant, “Accelerated weathering testing principles to estimate the service life of organic PV modules,” Solar Energy Mater. Solar Cells,

vol. 95, no. 5, pp. 1284–1292, May 2011.

J. M. Fife, M. Scharf, S. G. Hummel, and R. W. Morris, “Field reliability analysis methods for photovoltaic inverters,” in Proc. 35th IEEE Photovoltaic Spec. Conf. (PVSC), Jun. 2010, pp. 2767–2772.

R. Kadri, J.-P. Gaubert, and G. Champenois, “An improved maximum power point tracking for photovoltaic grid-connected inverter based on voltage-oriented control,” IEEE Trans. Ind. Electron., vol. 58, no. 1, pp. 66–75, Jan. 2011.

E. Koutroulis and F. Blaabjerg, “Design optimization of grid-connected PV inverters,” in Proc. 26th Annu. IEEE Appl. Power Electron. Conf. Expos., Mar. 2011, pp. 691–698.

P. Chaparala, E. Li, and S. Bhola, “Reliability qualification of photovoltaic smart panel electronics,” in Proc. 17th IEEE Int. Symp. Phys. Failure Anal. Integr. Circuits, Jul. 2010, pp. 1–4.


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