EPE Association: EPE 2017 - LS3f: Photovoltaics

EPE 2017 - LS3f: Photovoltaics
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 05: Renewable Energy Power Systems > EPE 2017 - LS3f: Photovoltaics

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   Analysis and prototyping of distributed series connected DC/AC converters integrated in PV panels
By Lyubomir KERACHEV [View]
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Abstract: This paper presents the design and the implementation of distributed, series connected DC/AC microconverters in a multi panel/cell photovoltaic system for stand-alone applications. The proposed topology is based on the direct, low voltage DC/AC energy conversion at PV panel/cell level using micro-inverters, integrated in a standard CMOS ASIC. In such a way, they can be physically implemented into the junction box on the backside of each PV module, replacing the bypass diodes. This approach maximizes the amount of harvested energy thanks to the single stage conversion architecture and the individual maximum power point tracking (MPPT) for each PV module. Among other advantages, this distributed approach benefits from interleaved control strategies allowing down scaling of the volume of the output inductor and the EMI filters and offering an increased apparent switching frequency and a reduced current ripple. The experimental validation of the approach is carried out with a string of four low power PV tiles (10W).

   Evaluation of Photovoltaic Microinverter Configurations based on Different Converter Stages and Step-up Voltage Ratios
By Diana LOPEZ [View]
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Abstract: Microinverters connect a single photovoltaic (PV) module to the grid, and therefore require a high voltage step-up conversion ratio. This is usually achieved in a two-stage approach with a step-up dc-dc converter followed by a step-down inverter. More recently single-stage step-up inverters have been proposed under the assumption that less stages improves efficiency. This paper compares these two approaches and proposes an alternative solution based on a two-stage configuration consisting of a step-up dc-dc converter followed by a step-up inverter, distributing the elevation ratio among the two stages.

   Highly Efficient and Compact Single Phase PV Inverter with GaN Transistors at 250 kHz Switching Frequency
By David DERIX [View]
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Abstract: The application of Gallium Nitride (GaN) power transistors in a single phase inverter for photovoltaic(PV) systems is presented inverter. The power of the system is 2 kW. For both stages (DC boost stageand inverter stage), a very high switching frequency of 250 kHz is used. By this, a highly compactdesign for the inverter (200 x 150 x 80 mm2 / 2.4 l) was reached. The power to weight ratiocorresponds to 1.2 kW/kg and the power to volume ratio to 0.85 kW/l. Despite the high switchingfrequency, a maximum efficiency of 98% is reached. Compared to state of the art PV inverters, thesize of the developed inverter was reduced by a factor of 5 while still maintaining a similar or evenhigher efficiency by means of an about 10 times higher switching frequency which is made possiblewith the use of GaN transistors.

   Model Predictive Control Based Current Ripple Damping in Single-Phase quasi-Impedance-Source Inverter
By Sertac BAYHAN [View]
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Abstract: A single-phase quasi-impedance source inverter (qZSI) has become an attractive solution for residential PV applications. However, due to the nature of this inverter topology, double-frequency (2_) power ripple issue should be considered since this issue has a negative impact on the system performance. This paper presents model predictive control (MPC) based current ripple damping control technique for single-phase qZSI. The main aim of the proposed control technique is suppressing the 2_ ripple in the input current by means of a simple and effective control technique without using any auxiliary circuit. The performances of the proposed control technique are investigated with MATLAB/Simulink and further validated experimentally.

EPE 2017 - LS3f: Photovoltaics
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 05: Renewable Energy Power Systems > EPE 2017 - LS3f: Photovoltaics
	[return to parent folder]

	Analysis and prototyping of distributed series connected DC/AC converters integrated in PV panels By Lyubomir KERACHEV	[View] [Download]
Abstract: This paper presents the design and the implementation of distributed, series connected DC/AC microconverters in a multi panel/cell photovoltaic system for stand-alone applications. The proposed topology is based on the direct, low voltage DC/AC energy conversion at PV panel/cell level using micro-inverters, integrated in a standard CMOS ASIC. In such a way, they can be physically implemented into the junction box on the backside of each PV module, replacing the bypass diodes. This approach maximizes the amount of harvested energy thanks to the single stage conversion architecture and the individual maximum power point tracking (MPPT) for each PV module. Among other advantages, this distributed approach benefits from interleaved control strategies allowing down scaling of the volume of the output inductor and the EMI filters and offering an increased apparent switching frequency and a reduced current ripple. The experimental validation of the approach is carried out with a string of four low power PV tiles (10W).

	Evaluation of Photovoltaic Microinverter Configurations based on Different Converter Stages and Step-up Voltage Ratios By Diana LOPEZ	[View] [Download]
Abstract: Microinverters connect a single photovoltaic (PV) module to the grid, and therefore require a high voltage step-up conversion ratio. This is usually achieved in a two-stage approach with a step-up dc-dc converter followed by a step-down inverter. More recently single-stage step-up inverters have been proposed under the assumption that less stages improves efficiency. This paper compares these two approaches and proposes an alternative solution based on a two-stage configuration consisting of a step-up dc-dc converter followed by a step-up inverter, distributing the elevation ratio among the two stages.

	Highly Efficient and Compact Single Phase PV Inverter with GaN Transistors at 250 kHz Switching Frequency By David DERIX	[View] [Download]
Abstract: The application of Gallium Nitride (GaN) power transistors in a single phase inverter for photovoltaic(PV) systems is presented inverter. The power of the system is 2 kW. For both stages (DC boost stageand inverter stage), a very high switching frequency of 250 kHz is used. By this, a highly compactdesign for the inverter (200 x 150 x 80 mm2 / 2.4 l) was reached. The power to weight ratiocorresponds to 1.2 kW/kg and the power to volume ratio to 0.85 kW/l. Despite the high switchingfrequency, a maximum efficiency of 98% is reached. Compared to state of the art PV inverters, thesize of the developed inverter was reduced by a factor of 5 while still maintaining a similar or evenhigher efficiency by means of an about 10 times higher switching frequency which is made possiblewith the use of GaN transistors.

	Model Predictive Control Based Current Ripple Damping in Single-Phase quasi-Impedance-Source Inverter By Sertac BAYHAN	[View] [Download]
Abstract: A single-phase quasi-impedance source inverter (qZSI) has become an attractive solution for residential PV applications. However, due to the nature of this inverter topology, double-frequency (2_) power ripple issue should be considered since this issue has a negative impact on the system performance. This paper presents model predictive control (MPC) based current ripple damping control technique for single-phase qZSI. The main aim of the proposed control technique is suppressing the 2_ ripple in the input current by means of a simple and effective control technique without using any auxiliary circuit. The performances of the proposed control technique are investigated with MATLAB/Simulink and further validated experimentally.