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AuthorKhan A.
AuthorBlaabjerg F.
Available date2019-09-30T07:48:38Z
Publication Date2018
Publication NameIEEE International Reliability Physics Symposium Proceedings
AbstractThe Dual Buck Inverter (DBI) possesses no shoot-through concerns and it can improve the efficiency by utilizing power MOSFETs. This is because at accidentally triggered shoot-through states; two inductors are in-parallel with the DC-Side source or capacitor, thus, protecting the DC-Side from short-circuit conditions. Also, the ground leakage current of the conventional DBI is inherently low. Hence, the DBI topology is considered as an attractive option in transformerless Single-Phase grid-connected Photovoltaic (PV) applications. Nevertheless, the inherent 2nd order Single-Phase power ripples may deteriorate the conventional DBIs' reliability. These ripples are normally buffered by utilizing bulky, unreliable and polarized electrolytic capacitors. Therefore, this paper proposes a modified all MOSFET based transformerless DBI topology with an Active Power Decoupling Control (APDC) that relies solely on the Common Mode (CM) operation. The analyses are verified on a 3 kW system. The results indicated that a capacitor of 30 ?? is adequate to achieve a ripple free DC-Bus voltage for a 3 kW inverter. The size of this capacitor is 50 times smaller compared to the original capacitor required by the system. Also, unlike the non-neutral point clamped topologies that eliminate the ground leakage current (e.g. HERIC and H5), the proposed system can attain grid-codes under non-unity power-factor and low solar irradiance level conditions. 2018 IEEE.
PublisherInstitute of Electrical and Electronics Engineers Inc.
SubjectActive Power Decoupling Control (APDC)
SubjectDual Buck Inverter (DBI)
SubjectPhotovoltaic (PV)
TitleModified transformerless dual buck inverter with improved lifetime for PV applications
TypeConference Paper
Volume Number2018-March

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