N. Papanikolaou, A. Kyritsis, Michael Loupis, Christos Tzotzos, Eingel Zoga
{"title":"Design Considerations for Single-Phase Line Frequency Transformers Applied at Photovoltaic Systems","authors":"N. Papanikolaou, A. Kyritsis, Michael Loupis, Christos Tzotzos, Eingel Zoga","doi":"10.1109/JPETS.2015.2433391","DOIUrl":null,"url":null,"abstract":"The issue of dc current injection at low voltage autonomous or interconnected grids as a result of photovoltaic (PV) systems integration is thoroughly discussed in this paper. This paper focuses on the sinusoidal pulsewidth modulation inverter with a low-frequency step-up transformer, as this was widely used in the past at PV grid connected applications, while nowadays, it is a favorable solution in standalone multisource residential applications. This paper highlights the fact that dc current injection is possible even at the presence of a low-frequency transformer. In addition, the impact of the dc current flow on the transformer efficiency is studied, and appropriate design considerations are extracted-thus limiting the dc current component in an efficient manner. The proposed design considerations are validated through experimental results accomplished on laboratory and commercial PV power conversion products.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"44 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2015-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Power and Energy Technology Systems Journal","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/JPETS.2015.2433391","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 9
Abstract
The issue of dc current injection at low voltage autonomous or interconnected grids as a result of photovoltaic (PV) systems integration is thoroughly discussed in this paper. This paper focuses on the sinusoidal pulsewidth modulation inverter with a low-frequency step-up transformer, as this was widely used in the past at PV grid connected applications, while nowadays, it is a favorable solution in standalone multisource residential applications. This paper highlights the fact that dc current injection is possible even at the presence of a low-frequency transformer. In addition, the impact of the dc current flow on the transformer efficiency is studied, and appropriate design considerations are extracted-thus limiting the dc current component in an efficient manner. The proposed design considerations are validated through experimental results accomplished on laboratory and commercial PV power conversion products.