DIAGNOSIS OF OPEN-CIRCUIT FAULT OF SWITCH TUBE OF CASCADED H-BRIDGE PHOTOVOLTAIC INVERTER

Wang Fusheng; Chen Tao; Dou Sheng; Weng Sai

doi:10.19912/j.0254-0096.tynxb.2020-0438

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (5) : 187-192. DOI: 10.19912/j.0254-0096.tynxb.2020-0438

DIAGNOSIS OF OPEN-CIRCUIT FAULT OF SWITCH TUBE OF CASCADED H-BRIDGE PHOTOVOLTAIC INVERTER

Wang Fusheng, Chen Tao, Dou Sheng, Weng Sai

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Abstract

Multilevel inverters contain a large number of semiconductor switches. Taking cascaded H-bridge photovoltaic inverters as an example, a rapid fault diagnosis and treatment method for open-circuit fault of switch tubes is proposed. The output voltage of each H-bridge module is sampled at the top or bottom of the carrier and used as the criterion to judge the open-circuit fault of the switch tube. After the diagnosis is completed, the corresponding measures should be taken to reduce the degree of fault. This method can accurately locate the fault switch tube in one carrier cycle. Experimental results demonstrate the effectiveness of this method.

Key words

PV inverters / switch tube / fault diagnosis / at the top or bottom of the carrier

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Wang Fusheng, Chen Tao, Dou Sheng, Weng Sai. DIAGNOSIS OF OPEN-CIRCUIT FAULT OF SWITCH TUBE OF CASCADED H-BRIDGE PHOTOVOLTAIC INVERTER[J]. Acta Energiae Solaris Sinica. 2022, 43(5): 187-192 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0438

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