Delta-connected cascaded H-bridge multilevel photovoltaic converters

Publication Type:
Conference Proceeding
IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society, 2015, pp. 2229 - 2234
Issue Date:
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© 2015 IEEE. Multilevel cascaded H-bridge converters are becoming popular for next generation large-scale photovoltaic power converters. However, the power generation levels in the three phases can be significantly unequal, especially in a large plant, owing to the non-uniform irradiance levels and/or ambient temperatures. This paper proposes the delta-connected cascaded H-bridge converter for large-scale photovoltaic farms. Compared to the existing star connection, the delta connection reduces the converter overrating required. Experimental results obtained from a 430 V, 10 kW, three-phase, seven-level, delta connected cascaded H-bridge converter prototype are provided to demonstrate the superiority of the delta connection.
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