Abstract
For grid integration photovoltaic (PV) system, either compact high-frequency transformer or bulky low-frequency transformer is employed in the DC- or AC side of the PV inverter, respectively, to step up the low output voltage of the PV modules to the grid voltage. Galvanic isolation is provided and the safety is assured with the use of transformer. Because of the high cost and high loss of the transformer, the PV inverter becomes expensive and low efficient. To mitigate these problems, the transformer is removed from the PV inverter. The transformerless PV inverter is smaller, cheaper, and higher in efficiency. Various transformerless PV inverter topologies, with different circuit configuration and modulation techniques, have been developed recently. The operating principle and the converter structure are evaluated in this chapter. It is expected that the transformerless PV inverter would have great potential for future renewable generation and smart microgrid applications.
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