A SPWM Full Bridge Inverter With Transformerless PV Grid Connected Inverter
Journal Title: International Journal of Science Engineering and Advance Technology - Year 2014, Vol 2, Issue 5
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.
Authors and Affiliations
K. Ravikumar| Working as, Associative professor in the EEE Dept, Priyadarshini Institute of Technology & Science, Chintalapudi, K. E. Ch. Vidyasagar| Working as, Assistant professor in the EEE Dept, Adama Science & Techonology university, Adama, Ethiopia, Hidayathulla Patnam| Working as, Assistant professor in the EEE Dept, in MJR, Ponnaganti Siva Ramakrishna | He is pursuing M.Tech in Electrical Power systems, in JNTU Kakinada
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