Simple Technique Reducing Leakage Current for H-Bridge Converter in Transformerless Photovoltaic Generation
| Autor: | Sebastian Stynski, Mariusz Malinowski, Jaroslaw Zaleski, Radoslaw Kot, Krzysztof Stepien |
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| Rok vydání: | 2016 |
| Předmět: |
Forward converter
Engineering Flyback converter business.industry Buck converter 020208 electrical & electronic engineering Photovoltaic system Ćuk converter Buck–boost converter 02 engineering and technology H bridge Control and Systems Engineering Boost converter 0202 electrical engineering electronic engineering information engineering Electronic engineering Electrical and Electronic Engineering business |
| Zdroj: | Journal of Power Electronics. 16:153-162 |
| ISSN: | 1598-2092 |
| DOI: | 10.6113/jpe.2016.16.1.153 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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