Transformerless PV inverters - recent test results and a discussion of DC current injection and safety issues

Calais, Martina, Ruscoe, Andrew, Morris, Claude, Dymond, Mike, & Pezeshki, Houman (2010) Transformerless PV inverters - recent test results and a discussion of DC current injection and safety issues. In Proceedings of Solar 2010 - the 48th Conference : Solar for a Sustainable Future, Australian Solar Council, Australian National University, Canberra.

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With the variety of PV inverter types and the number of transformerless PV inverters on the Australian market increasing, we revisit some of the issues associated with these topologies. A recent electric shock incident in Queensland (luckily without serious outcome) associated with a transformerless PV system, highlights the need for earthing PV array structures and PV module frames to prevent capacitive leakage currents causing electric shock. The presented test results of the relevant voltages associated with leakage currents of five transformerless PV inverters stress this requirement, which is currently being addressed by both the Clean Energy Council and Standards Australia. DC current injection tests were performed on the same five inverters and were used to develop preliminary recommendations for a more meaningful DC current test procedure for AS4777 Part 2. The test circuit, methodology and results are presented and discussed. A notable temperature dependency of DC current injections with three of the five inverters suggests that DC current injection should be tested at high and low internal inverter temperatures whereas the power dependency noted only for one inverter does not seem to justify recommendations for a (rather involved) standard test procedure at different power levels.

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ID Code: 79457
Item Type: Conference Paper
Refereed: Yes
Keywords: DC curr ent injection, grid connected PV systems, standards, transformerless PV inverters
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 [Please consult the Authors]
Deposited On: 15 Dec 2014 05:11
Last Modified: 06 Jan 2015 04:56

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