توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Study of Leakage Current Phenomena in Hybrid 2\3–Level Three–Phase Transformerless Photovoltaic Grid–Connected Inverters
اطلاعات انتشار: اولین کنفرانس بین المللی دستاوردهای نوین پژوهشی در مهندسی برق و کامپیوتر، سال
تعداد صفحات: ۶
In photovoltaic (PV) applications, it is possible to eliminate the transformer from the PV system in order to improve the efficiency and reduce cost, losses, and size. The main issue arises when the transformer is removed. This issue is due to the presence of a parasitic capacitance between the metal frame of the panel and the PV cells. This stray capacitor causes the leakage current. This current increases current harmonics injected into the utility grid, the radiated and conducted electromagnetic emissions, and losses. In this paper, application of the hybrid 2\3–level converter as grid–connected photovoltaic inverter is studied. Moreover, a novel modulation method is proposed for this topology that can be efficiently implemented to reduce leakage current. Through simulation case studies, the effectiveness of the proposed modulation method is validated; unlike traditional full–bridge inverters, leakage current of hybrid 2\3–level converter meet the requirements of transformerless PV inverters.<\div>

۲A Novel Modulation Method for Capability of Reactive Power Injection in Single–Phase Transformerless Photovoltaic H5 Inverter
اطلاعات انتشار: اولین کنفرانس بین المللی دستاوردهای نوین پژوهشی در مهندسی برق و کامپیوتر، سال
تعداد صفحات: ۶
H5 is among the popular topologies used in the single phase photovoltaic systems due to its low leakage current and high efficiency. As the power capacity of photovoltaic systems is increasingly growing, grid standards should consider reactive power control for distributed solar generation units. In single–phase photovoltaic systems, this capability contributes to power quality of the grid. In this paper, the capability of the H5 topology for operating in power factors other than unity is analyzed in detail. The two conventional modulation methods proposed in earlier works, are evaluated according to the capability of reactive power injection, the leakage current issue, and efficiency of the topology. Moreover, a novel modulation method is proposed enabling the reactive power injection with less switching. In addition, switches’ stresses are reduced owing to the proposed modulation method. The advantages of the proposed method are validated using accurate MATLAB\SIMULINK simulations.<\div>
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