Simple Technique Reducing Leakage Current for H-Bridge Converter in Transformerless Photovoltaic Generation

Radoslaw Kot; Sebastian Stynski; Krzysztof Stepien; Jaroslaw Zaleski; Mariusz Malinowski

Simple Technique Reducing Leakage Current for H-Bridge Converter in Transformerless Photovoltaic Generation

Vol. 16, No. 1, pp. 153-162, Jan. 2016

10.6113/JPE.2016.16.1.153

Leakage currents

Pulse width modulation (PWM)

Renewable energy

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Abstract

Given their structural arrangement, photovoltaic (PV) modules exhibit parasitic capacitance, which creates a path for high-frequency current during zero-state switching of the converter in transformerless systems. This current has to be limited to ensure safety and electromagnetic compatibility. Many solutions that can minimize or completely avoid this phenomenon, are available. However, most of these solutions are patented because they rely on specific and often complex converter topologies. This study aims to solve this problem by introducing a solution based on a classic converter topology with an appropriate modulation technique and passive filtering. A 5.5 kW single-phase residential PV system that consists of DC-DC boost stage and DC-AC H-bridge converter is considered. Control schemes for both converter stages are presented. An overview of existing modulation techniques for H-bridge converter is provided, and a modification of hybrid modulation is proposed. A system prototype is built for the experimental verification. As shown in the study, with simple filtering and proper selection of switching states, achieving low leakage current level is possible while maintaining high converter efficiency and required energy quality.

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Cite this article

[IEEE Style]

R. Kot, S. Stynski, K. Stepien, J. Zaleski, M. Malinowski, "Simple Technique Reducing Leakage Current for H-Bridge Converter in Transformerless Photovoltaic Generation," Journal of Power Electronics, vol. 16, no. 1, pp. 153-162, 2016. DOI: 10.6113/JPE.2016.16.1.153.

[ACM Style]

Radoslaw Kot, Sebastian Stynski, Krzysztof Stepien, Jaroslaw Zaleski, and Mariusz Malinowski. 2016. Simple Technique Reducing Leakage Current for H-Bridge Converter in Transformerless Photovoltaic Generation. Journal of Power Electronics, 16, 1, (2016), 153-162. DOI: 10.6113/JPE.2016.16.1.153.