EPE Association: EPE 2022 - DS2i: Solar-Energy Systems

EPE 2022 - DS2i: Solar-Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2022 - DS2i: Solar-Energy Systems

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   A Topology-Morphing Series Resonant Converter for Photovoltaic Module Applications
By Grigorios SERGENTANIS [View]
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Abstract: Residential solar photovoltaic (PV) installations frequently use power optimizers to increase their energy production. In this application, the ability to regulate a wide range of voltage with high efficiency is highly desirable. Thus, this paper proposes a novel hybrid-controlled series resonant converter (SRC) for photovoltaic power optimizers. The converter utilizes the advantage of GaN devices, which have improved switching transition times compared to Si devices, hence providing a lower switching loss. Regulation is achieved with fixed-frequency PWM control on the secondary side, while ZVS and ZCS of the devices are achieved with the proposed resonant tank design. The proposed converter maintains high efficiency over a wide voltage range, making the PV system shade-tolerant while keeping the number of switching devices low. The paper presents the operating principles, the design methodology, and simulation results. The results show a high efficiency over a wide voltage range, as well as a wide load range.

   Analog MPPT Comparison for Interplanetary Small Satellites Missions
By Cristian TORRES VERGARA [View]
[Download]

Abstract: This paper describes and compares two different Maximum Power Point Tracking (MPPT) techniques devised for micro satellite Solar Array Regulation (SAR). An Analog Global MPPT is introduced and compared with an Analog Oscillating MPPT. Advantages and limitations are discussed. Experimental validation has been carried out using a Power Conditioning Unit and different I/V curves.

   Boost/Buck-boost Based Grid Connected Solar PV Micro-inverter with Reduced Number of Switches and Having Power Decoupling Capability
By Arup Ratan PAUL [View]
[Download]

Abstract: A boost/buck-boost based transformer-less micro-inverter suitable for interfacing a 35 V, 220 W PV module to a single phase 220 V ac grid is proposed in this paper. The intermediate capacitor between the the boost stage and the buck-boost stage helps in achieving power decoupling between the dc side and the ac side. Since the inverter is endowed with inherent power decoupling feature, it is more reliable compared to the inverters utilizing high value electrolytic capacitors. The micro-inverter utilizes six switches, two of them operating at high frequency, two at line frequency and the rest two switches operate at high frequency either during the positive half cycle or in the negative half cycle. Both the boost stage and buck-boost stage is operated in discontinuous conduction mode for all possible operating conditions in order to achieve higher voltage gain, and negligible turn on losses of the high frequency switches. The direct connection between the negative terminal of the PV module and the grid neutral ensures the leakage current flow to be zero. The analyses of the proposed micro-inverter is carried out. The viability if the proposed scheme is validated by detailed simulation studies in the MATLAB/Simulink platform.

   Cost Comparison for Different PV-Battery System Architectures Including Power Converter Reliability
By Martijn DECKERS [View]
[Download]

Abstract: This paper compares the levelized energy cost of a commercial DC-coupled photovoltaic battery systems with a multiple input multiple output converter. The comparison is based on an electrothermal simulation allowing to include the actual converter efficiency and degradation in different use cases. The multiple input multiple output converter proofs to be less expensive and more reliable, however, the lower efficiency causes the final levelized energy cost to be higher.

   Dynamic Maximum Power Point Tracking Method including Detection of Varying Partial Shading Conditions for Photovoltaic Systems
By Rosalie ROUPHAEL [View]
[Download]

Abstract: Photovoltaic (PV) systems, being one of the promising power generation systems, need performance optimization typically under partial shading conditions (PSCs). In such non-uniform irradiation conditions, not only conventional maximum power point tracking (MPPT) algorithms but also advanced techniques fail in operating at the power peak. So, global maximum power point tracking (GMPPT) methods are needed when several local maximum power points exist under PSCs. The major difficulty is not in detecting the GMPP but in finding the new one when the PSCs change. Consequently, the challenge becomes in detecting the variation of PSCs. The proposed method relies on monitoring the rate change on power at the output of the PV panel. Proving that this criterion alone is not accurate, a measurement Q is introduced and used as a watchdog for critical partially shaded cases. When in such case, a timer alternates between a scanning process and a dual-mode MPPT method based on perturb and observe (P&O) and constant voltage algorithms. Otherwise, the MPPT work in not interrupted unless a drastic power change takes place. The proposed algorithm proved its efficiency in all partially shaded irradiation conditions when implemented in a MATLAB/Simulink environment. Furthermore, it is compared to other partial shading detection (PSD) methods to verify the algorithm's performance in a generic case.

EPE 2022 - DS2i: Solar-Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2022 - DS2i: Solar-Energy Systems
	[return to parent folder]

	A Topology-Morphing Series Resonant Converter for Photovoltaic Module Applications By Grigorios SERGENTANIS	[View] [Download]
Abstract: Residential solar photovoltaic (PV) installations frequently use power optimizers to increase their energy production. In this application, the ability to regulate a wide range of voltage with high efficiency is highly desirable. Thus, this paper proposes a novel hybrid-controlled series resonant converter (SRC) for photovoltaic power optimizers. The converter utilizes the advantage of GaN devices, which have improved switching transition times compared to Si devices, hence providing a lower switching loss. Regulation is achieved with fixed-frequency PWM control on the secondary side, while ZVS and ZCS of the devices are achieved with the proposed resonant tank design. The proposed converter maintains high efficiency over a wide voltage range, making the PV system shade-tolerant while keeping the number of switching devices low. The paper presents the operating principles, the design methodology, and simulation results. The results show a high efficiency over a wide voltage range, as well as a wide load range.

	Analog MPPT Comparison for Interplanetary Small Satellites Missions By Cristian TORRES VERGARA	[View] [Download]
Abstract: This paper describes and compares two different Maximum Power Point Tracking (MPPT) techniques devised for micro satellite Solar Array Regulation (SAR). An Analog Global MPPT is introduced and compared with an Analog Oscillating MPPT. Advantages and limitations are discussed. Experimental validation has been carried out using a Power Conditioning Unit and different I/V curves.

	Boost/Buck-boost Based Grid Connected Solar PV Micro-inverter with Reduced Number of Switches and Having Power Decoupling Capability By Arup Ratan PAUL	[View] [Download]
Abstract: A boost/buck-boost based transformer-less micro-inverter suitable for interfacing a 35 V, 220 W PV module to a single phase 220 V ac grid is proposed in this paper. The intermediate capacitor between the the boost stage and the buck-boost stage helps in achieving power decoupling between the dc side and the ac side. Since the inverter is endowed with inherent power decoupling feature, it is more reliable compared to the inverters utilizing high value electrolytic capacitors. The micro-inverter utilizes six switches, two of them operating at high frequency, two at line frequency and the rest two switches operate at high frequency either during the positive half cycle or in the negative half cycle. Both the boost stage and buck-boost stage is operated in discontinuous conduction mode for all possible operating conditions in order to achieve higher voltage gain, and negligible turn on losses of the high frequency switches. The direct connection between the negative terminal of the PV module and the grid neutral ensures the leakage current flow to be zero. The analyses of the proposed micro-inverter is carried out. The viability if the proposed scheme is validated by detailed simulation studies in the MATLAB/Simulink platform.

	Cost Comparison for Different PV-Battery System Architectures Including Power Converter Reliability By Martijn DECKERS	[View] [Download]
Abstract: This paper compares the levelized energy cost of a commercial DC-coupled photovoltaic battery systems with a multiple input multiple output converter. The comparison is based on an electrothermal simulation allowing to include the actual converter efficiency and degradation in different use cases. The multiple input multiple output converter proofs to be less expensive and more reliable, however, the lower efficiency causes the final levelized energy cost to be higher.

	Dynamic Maximum Power Point Tracking Method including Detection of Varying Partial Shading Conditions for Photovoltaic Systems By Rosalie ROUPHAEL	[View] [Download]
Abstract: Photovoltaic (PV) systems, being one of the promising power generation systems, need performance optimization typically under partial shading conditions (PSCs). In such non-uniform irradiation conditions, not only conventional maximum power point tracking (MPPT) algorithms but also advanced techniques fail in operating at the power peak. So, global maximum power point tracking (GMPPT) methods are needed when several local maximum power points exist under PSCs. The major difficulty is not in detecting the GMPP but in finding the new one when the PSCs change. Consequently, the challenge becomes in detecting the variation of PSCs. The proposed method relies on monitoring the rate change on power at the output of the PV panel. Proving that this criterion alone is not accurate, a measurement Q is introduced and used as a watchdog for critical partially shaded cases. When in such case, a timer alternates between a scanning process and a dual-mode MPPT method based on perturb and observe (P&O) and constant voltage algorithms. Otherwise, the MPPT work in not interrupted unless a drastic power change takes place. The proposed algorithm proved its efficiency in all partially shaded irradiation conditions when implemented in a MATLAB/Simulink environment. Furthermore, it is compared to other partial shading detection (PSD) methods to verify the algorithm's performance in a generic case.