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

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2017

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Bay, Olcay

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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.

Subject Keywords

Silicon Carbide., Photovoltaic power generation., Pulse-duration modulation.

URI

http://etd.lib.metu.edu.tr/upload/12621772/index.pdf
https://hdl.handle.net/11511/27031

Collections

Graduate School of Natural and Applied Sciences, Thesis

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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.