EPE Association: EPE 2016 - LS2d: Solar Energy Systems

EPE 2016 - LS2d: Solar Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 05: Renewable Energy Power Systems > EPE 2016 - LS2d: Solar Energy Systems

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   Evaluation of a NPC1 phase leg built from three standard IGBT modules for 1500 VDC photovoltaic central inverters with 500 kVA and beyond
By Uwe JANSEN [View]
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Abstract: This paper presents the concept and characterization of a NPC1 phase leg built up out of threePrimePACK 2 power modules with .XT and 1200 V IGBT5. The target application of such atopology is 1500 V solar central inverter. After a short description of the cosmic ray reliability issuesleading to the NPC1 approach, different design concepts will be discussed. Double pulsemeasurements have been used to characterize the overvoltage during the long commutation in reactivepower mode. The moderate stray inductance of the long commutation path within the design of thePrimePACK 2 NPC1 phase leg allows a safe turn-off without the need of clamping diodes in thedriver. Furthermore the power conversion efficiency as well as the maximum power rating of a solarcentral inverter using the presented concept has been investigated by feeding the measured switchingenergies into simulations. It turns out that a power rating of more than 800 kVA can be reached due tothe higher power density and more efficient switching thanks to the .XT and IGBT5 technology.

   Flyback-based Sub-Module PV Micro-inverter
By Hugues RENAUDINEAU [View]
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Abstract: This paper proposes sub-module integration of a photovoltaic (PV) microinverter. It is proposed to remove the existing junction box and replace the by-pass diodes with individual DC-DC converters connected to a single-phase inverter. Particular attention is given to systems operating under long-term non-uniform conditions, such as snow or dust accumulation. A comparison with a classical two-stage interleaved-flyback microinverter is provided to analyze the performance and to quantify the improvements of the proposed structure.

   Photovoltaic Generators Interfacing a DC Micro-Grid: Design Considerations for a Double-Stage Boost Power Converter System
By Rabab ALSHARIF [View]
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Abstract: A photovoltaic generator (PVG) is usually connected to a DC micro-grid via a multi-stage-step-up power converter to improve system modularity, minimise shading effects and boost PVG voltage. Under varying operating conditions, the nonlinear characteristics of a PVG may affect performance of the entire PVG system. Further, if these issues are not properly taken into account at the design stage, significant changes in system dynamics may risk stability of the system. Therefore, it is important to understand interactions between a PVG and the rest of the system. A clear understanding of these interactions can help to set system design recommendations and guidelines. In particular, this paper explores the effects of a nonlinear PVG source interfacing a double-stage conventional boost converter connected to a DC bus. It addresses the impact of these effects on the design of both the power circuit and the control loops. Finally, this paper provides system design recommendations to ensure stability under varying operating conditions.

EPE 2016 - LS2d: Solar Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 05: Renewable Energy Power Systems > EPE 2016 - LS2d: Solar Energy Systems
	[return to parent folder]

	Evaluation of a NPC1 phase leg built from three standard IGBT modules for 1500 VDC photovoltaic central inverters with 500 kVA and beyond By Uwe JANSEN	[View] [Download]
Abstract: This paper presents the concept and characterization of a NPC1 phase leg built up out of threePrimePACK 2 power modules with .XT and 1200 V IGBT5. The target application of such atopology is 1500 V solar central inverter. After a short description of the cosmic ray reliability issuesleading to the NPC1 approach, different design concepts will be discussed. Double pulsemeasurements have been used to characterize the overvoltage during the long commutation in reactivepower mode. The moderate stray inductance of the long commutation path within the design of thePrimePACK 2 NPC1 phase leg allows a safe turn-off without the need of clamping diodes in thedriver. Furthermore the power conversion efficiency as well as the maximum power rating of a solarcentral inverter using the presented concept has been investigated by feeding the measured switchingenergies into simulations. It turns out that a power rating of more than 800 kVA can be reached due tothe higher power density and more efficient switching thanks to the .XT and IGBT5 technology.

	Flyback-based Sub-Module PV Micro-inverter By Hugues RENAUDINEAU	[View] [Download]
Abstract: This paper proposes sub-module integration of a photovoltaic (PV) microinverter. It is proposed to remove the existing junction box and replace the by-pass diodes with individual DC-DC converters connected to a single-phase inverter. Particular attention is given to systems operating under long-term non-uniform conditions, such as snow or dust accumulation. A comparison with a classical two-stage interleaved-flyback microinverter is provided to analyze the performance and to quantify the improvements of the proposed structure.

	Photovoltaic Generators Interfacing a DC Micro-Grid: Design Considerations for a Double-Stage Boost Power Converter System By Rabab ALSHARIF	[View] [Download]
Abstract: A photovoltaic generator (PVG) is usually connected to a DC micro-grid via a multi-stage-step-up power converter to improve system modularity, minimise shading effects and boost PVG voltage. Under varying operating conditions, the nonlinear characteristics of a PVG may affect performance of the entire PVG system. Further, if these issues are not properly taken into account at the design stage, significant changes in system dynamics may risk stability of the system. Therefore, it is important to understand interactions between a PVG and the rest of the system. A clear understanding of these interactions can help to set system design recommendations and guidelines. In particular, this paper explores the effects of a nonlinear PVG source interfacing a double-stage conventional boost converter connected to a DC bus. It addresses the impact of these effects on the design of both the power circuit and the control loops. Finally, this paper provides system design recommendations to ensure stability under varying operating conditions.