Highly Efficient Single-Phase Transformerless Inverters for Grid-Connected Photovoltaic Systems

By S. Araújo, P. Zacharias, R. Mallwitz. IEEE transactions on industrial electronics (1982. Print), 2010

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Transformerless Inverter Topologies for Single-Phase Photovoltaic Systems: A Comparative Review (2020, background): “The main disadvantage of this topology is the higher conduction losses through the three associated series switches in the active phase [105].”
Leakage Current Reduction in a Single-Phase Bidirectional AC–DC Full-Bridge Inverter (2012, methodology): “The modified bridgeless power factor correction (PFC) topology and Karschny topology are discussed in [4] and [22].”
Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression (2015, neutral): “4(b) with similar operation modes [66].”
Transformerless Inverter With Virtual DC Bus Concept for Cost-Effective Grid-Connected PV Power Systems (2013, methodology): “Other transformerless inverter topologies: (a) Karschny inverter [19]; (b) paralleled-buck inverter [20]; (c) H6 inverter with capacitor voltage divider [21].”
Decoupling of Fluctuating Power in Single-Phase Systems Through a Symmetrical Half-Bridge Circuit (2015, background): “It may also become problematic in H5 inverters, where the full-bridge circuit will be intermittently isolated from the dc link in order to eliminate the leakage current [20].”