EPE Association: EPE 2023 - DS1j: Solar-Energy Systems

EPE 2023 - DS1j: Solar-Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2023 - DS1j: Solar-Energy Systems

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   A Real-time Power Management Strategy based on Artificial Potential Field for Residential PV Systems
By Xiangqiang WU, Zhongting TANG, Tamas KEREKES [View]
[Download]

Abstract: In order to avoid invalid optimization of day-ahead energy management strategies due to power fluctuations, a real-time strategy based on the artificial potential field is proposed in this paper. Based on one-year data, it has been validated that the proposed strategy can decrease battery degradation effectively, hence reducing the total operation cost by 4.7\%.

   Enhancing Primary Frequency Control in Microgrids through Self-Smoothing Photovoltaic Systems
By Nida RIAZ, Lasse PELTONEN, Sami REPO, Pertti JÄRVENTAUSTA [View]
[Download]

Abstract: The intermittency of solar photovoltaic (PV) generation creates challenges for the frequency control which raises the need of employing fast acting reserves e.g., Battery Energy storage systems (BESS) to improve the system frequency response. This paper explores the concept of orientational smoothing together with frequency control of the deloaded PV systems to improve self-balancing, reduce reliance on battery energy storage systems (BESS), and ensure more consistent availability of regulation reserves. The methodology involves EMT-type simulations for 7 different cases of distributed PV orientations. These cases are studied for three different frequency control scenarios of a microgrid. The results demonstrate that PV systems with real rooftop and east-west orientations exhibit reduced frequency deviations and rate of change of frequency.

   Impacts of High-Frequency Harmonics of Input Current on a Multi-String Full-Bridge Solar Inverter
By Behzad SOLEYMANI, Suzan EREN [View]
[Download]

Abstract: This paper presents a comparative loss analysis of the inverter both with and without employing a DC filter at the input. The experimental results of a multi-string PV system were obtained to confirm the theoretical analysis and demonstrate the adverse effects of the input harmonics on inverter efficiency and reliability.

   Long Term Evaluation of a Pantile-based Maximum Power Point Tracking DC-DC Power Converter for Solar Roof Tiles
By Tobias ZEKORN, Léon WEIHS, Kenny VOHL, Michael HANHART, Leo ROLFF, Wunderlich RALF, Stefan HEINEN [View]
[Download]

Abstract: This paper presents a pantile-based maximum power point tracking DC-DC Converter for solar roof tiles with one year of real world longterm measurements. By individually tracking the maximum power point and stepping up the output voltage of the pantiles used the total amount of harvested energy is increased by 14.2\% under ideal circumstances for the array of solar tiles. Further, the performance of the individual maximum power point tracking (MPPT) strongly profits from nonidealcircumstances like shadowing or leaves on the solar tiles compared to the cluster tracking. The integrated asynchronous switched-mode DC-DC converter has a peak efficiency of 94.95\%, an input power range of 0.2W to 22W and a measured temperature range of -18°C to 80°C. The described setup was measured on a test stand on the roof under real world conditions for more than a year in a long term evaluation.

   Optimization and Analysis of a 50 KW Photovoltaic Power Plant with Examination of Partial Shading Conditions
By Maryam SEPEHRINOUR, Hamed KARIMI, Alireza SIADATAN [View]
[Download]

Abstract: Renewable energy is considered a suitable alternative for the growing needs of energy demand in the country. The Iranian government recently announced that it plans to achieve 45 GW of solar capacity by 2030, of which 40 percent is expected to be dedicated to rooftop solar projects. One of these projects is a 50-kilowatt photovoltaic (PV) power plant on the roof of the central building of Tehran Electricity Distribution Company. This power plant produces 118.3 MWh/year of electricity annually and has reduced greenhouse gas emissions by 4070 kg per month. Therefore, it can be effective in encouraging investment in the construction of these small power plants in the residential sector.

   Passivity-Based Stability of LCL-Type Grid-Connected Inverter via All-Pass Filters
By Jiacheng SUN, Wenli YAO, Ting WANG, Jinxin LIU, Xiaobin ZHANG, Dao ZHOU [View]
[Download]

Abstract: The impedance interaction between the variable grid impedance and the LCL-type inverter leads to resonance of the system. Passivity-based stability design is widely used for grid-connected applications. In this paper, an all-pass filter-based grid current feedback is proposed to reshape the phase response of the control output impedance, which is easy to implement, and simulations verify the effectiveness of the proposed method while ensuring the dynamic performance.

   Thermal Stress Balancing for Lifetime Improvement of H6 Solar Inverter
By Abhishek CHANEKAR, Nachiketa DESHMUKH, Akash GANGWAR, Sandeep ANAND [View]
[Download]

Abstract: The thermal stress of power semiconductor devices (PSDs) of the H6 solar inverter dictates their lifetime. Two existing modulation schemes for H6 inverter are studied, and their thermal stress distribution is analyzed. It is found that unequal stress distribution exists among PSDs for both modulation strategies. This leads to the earlier failure of some PSDs than others. To address this issue, this paper proposes a hybrid modulation strategy and associated thermal controller for the lifetime enhancement of PSDs in the H6 solar inverter. The proposed thermal controller dictates the hybridization angle to equalize the thermal stress of the PSDs. The proposed technique is estimated to achieve up to 26.5\% improvement in a lifetime for the selected mission profile. The impact of the proposed thermal controller on the efficiency of the converter is also studied. It is estimated that a 26.5\% enhancement in lifetime is achieved for a 0.23\% drop in conversion efficiency.

EPE 2023 - DS1j: Solar-Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2023 - DS1j: Solar-Energy Systems
	[return to parent folder]

	A Real-time Power Management Strategy based on Artificial Potential Field for Residential PV Systems By Xiangqiang WU, Zhongting TANG, Tamas KEREKES	[View] [Download]
Abstract: In order to avoid invalid optimization of day-ahead energy management strategies due to power fluctuations, a real-time strategy based on the artificial potential field is proposed in this paper. Based on one-year data, it has been validated that the proposed strategy can decrease battery degradation effectively, hence reducing the total operation cost by 4.7\%.

	Enhancing Primary Frequency Control in Microgrids through Self-Smoothing Photovoltaic Systems By Nida RIAZ, Lasse PELTONEN, Sami REPO, Pertti JÄRVENTAUSTA	[View] [Download]
Abstract: The intermittency of solar photovoltaic (PV) generation creates challenges for the frequency control which raises the need of employing fast acting reserves e.g., Battery Energy storage systems (BESS) to improve the system frequency response. This paper explores the concept of orientational smoothing together with frequency control of the deloaded PV systems to improve self-balancing, reduce reliance on battery energy storage systems (BESS), and ensure more consistent availability of regulation reserves. The methodology involves EMT-type simulations for 7 different cases of distributed PV orientations. These cases are studied for three different frequency control scenarios of a microgrid. The results demonstrate that PV systems with real rooftop and east-west orientations exhibit reduced frequency deviations and rate of change of frequency.

	Impacts of High-Frequency Harmonics of Input Current on a Multi-String Full-Bridge Solar Inverter By Behzad SOLEYMANI, Suzan EREN	[View] [Download]
Abstract: This paper presents a comparative loss analysis of the inverter both with and without employing a DC filter at the input. The experimental results of a multi-string PV system were obtained to confirm the theoretical analysis and demonstrate the adverse effects of the input harmonics on inverter efficiency and reliability.

	Long Term Evaluation of a Pantile-based Maximum Power Point Tracking DC-DC Power Converter for Solar Roof Tiles By Tobias ZEKORN, Léon WEIHS, Kenny VOHL, Michael HANHART, Leo ROLFF, Wunderlich RALF, Stefan HEINEN	[View] [Download]
Abstract: This paper presents a pantile-based maximum power point tracking DC-DC Converter for solar roof tiles with one year of real world longterm measurements. By individually tracking the maximum power point and stepping up the output voltage of the pantiles used the total amount of harvested energy is increased by 14.2\% under ideal circumstances for the array of solar tiles. Further, the performance of the individual maximum power point tracking (MPPT) strongly profits from nonidealcircumstances like shadowing or leaves on the solar tiles compared to the cluster tracking. The integrated asynchronous switched-mode DC-DC converter has a peak efficiency of 94.95\%, an input power range of 0.2W to 22W and a measured temperature range of -18°C to 80°C. The described setup was measured on a test stand on the roof under real world conditions for more than a year in a long term evaluation.

	Optimization and Analysis of a 50 KW Photovoltaic Power Plant with Examination of Partial Shading Conditions By Maryam SEPEHRINOUR, Hamed KARIMI, Alireza SIADATAN	[View] [Download]
Abstract: Renewable energy is considered a suitable alternative for the growing needs of energy demand in the country. The Iranian government recently announced that it plans to achieve 45 GW of solar capacity by 2030, of which 40 percent is expected to be dedicated to rooftop solar projects. One of these projects is a 50-kilowatt photovoltaic (PV) power plant on the roof of the central building of Tehran Electricity Distribution Company. This power plant produces 118.3 MWh/year of electricity annually and has reduced greenhouse gas emissions by 4070 kg per month. Therefore, it can be effective in encouraging investment in the construction of these small power plants in the residential sector.

	Passivity-Based Stability of LCL-Type Grid-Connected Inverter via All-Pass Filters By Jiacheng SUN, Wenli YAO, Ting WANG, Jinxin LIU, Xiaobin ZHANG, Dao ZHOU	[View] [Download]
Abstract: The impedance interaction between the variable grid impedance and the LCL-type inverter leads to resonance of the system. Passivity-based stability design is widely used for grid-connected applications. In this paper, an all-pass filter-based grid current feedback is proposed to reshape the phase response of the control output impedance, which is easy to implement, and simulations verify the effectiveness of the proposed method while ensuring the dynamic performance.

	Thermal Stress Balancing for Lifetime Improvement of H6 Solar Inverter By Abhishek CHANEKAR, Nachiketa DESHMUKH, Akash GANGWAR, Sandeep ANAND	[View] [Download]
Abstract: The thermal stress of power semiconductor devices (PSDs) of the H6 solar inverter dictates their lifetime. Two existing modulation schemes for H6 inverter are studied, and their thermal stress distribution is analyzed. It is found that unequal stress distribution exists among PSDs for both modulation strategies. This leads to the earlier failure of some PSDs than others. To address this issue, this paper proposes a hybrid modulation strategy and associated thermal controller for the lifetime enhancement of PSDs in the H6 solar inverter. The proposed thermal controller dictates the hybridization angle to equalize the thermal stress of the PSDs. The proposed technique is estimated to achieve up to 26.5\% improvement in a lifetime for the selected mission profile. The impact of the proposed thermal controller on the efficiency of the converter is also studied. It is estimated that a 26.5\% enhancement in lifetime is achieved for a 0.23\% drop in conversion efficiency.