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This paper presents a fault-tolerant two-level single phase voltage source inverter (VSI). The proposed topology requires four additional bidirectional switches and it can continue to operate at rated power under both open circuit and short circuit faults of any switching device. Fault tolerant operation is achieved by swapping the inverter output terminals using the additional switches. Furthermore,...
A novel full-bridge single-phase neutral point clamped (NPC) transformerless inverter for grid-connected photovoltaic system is proposed in this paper with the intent to improve the reliability and reduce the common-mode leakage current. The proposed inverter incorporates two coupled inductors along with series connected switch on ac side that operate alternately in positive and negative half period...
Characterized by high efficiency and low cost, single-phase transformerless inverters are suitable for grid-connected photovoltaic (PV) generation especially at low power (<5kW). Since galvanic isolation is omitted, leakage current can flow through stray capacitance between the PV array terminals and the ground. Therefore, the leakage current generated by transformerless inverter has to be regulated...
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