Design and implementation of a sic based three phase grid-connected current source inverter for solar applications

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2017
Bay, Olcay
In this thesis, analysis, design and implementation of a three-phase 400V, 20 kVA Current Source Inverter (CSI) have been carried out for grid-connected photovoltaic applications based on the multi-string inverter concept. This inverter can be used in large scale photovoltaic (PV) applications by connecting many in parallel at 400V and coupling to medium voltage through a common transformer. The power stage of the inverter is based on the basic full-bridge CSC topology and each power semiconductor which must have bipolar voltage blocking and unidirectional current carrying capability is formed by connecting a Silicon Carbide (SiC) MOSFET and a SiC Shottky Barrier Diode (SBD) in series and switched by employing Pulse Width Modulation (PWM) method with a carrier frequency of 25 kHz. The Current Source Inverter (CSI) offers several advantages for PV applications in terms of its ability to transfer power through a single power conversion stage over the entire MPP voltage range, direct output current controllability, and low Total Harmonic Distortion (THD) values over a wide range of output power with simpler AC filter. Results of this research have shown that CSI will become a strong alternative to Voltage Source Inverter (VSI) for PV applications with the widespread use of high voltage and current SiC power semiconductors.

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Citation Formats
O. Bay, “Design and implementation of a sic based three phase grid-connected current source inverter for solar applications,” M.S. - Master of Science, Middle East Technical University, 2017.