EPE Association: EPE 2017 - DS1i: Solar Energy Systems I

EPE 2017 - DS1i: Solar Energy Systems I
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 - DS1i: Solar Energy Systems I

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   An Open-Circuit Faults Diagnostic Algorithm for Solar Cell System
By Li WANG [View]
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Abstract: In this paper, a multi-degree open-circuit faults diagnostic algorithm, for improving condition monitoring ability of spacecraft solar cell system, has been proposed. This algorithm combines the output parameter, output voltage, output current and the impedance of solar cell system under low frequency domain. The algorithm can be used to diagnose the degree of faults quantitively and quickly. The feasibility and accuracy of the method has been proven through simulation and experiment.

   Application of Enhanced Simulated Annealing GMPPT Algorithm for Different PV Systems in Mismatch
By Feng WANG [View]
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Abstract: PV systems are influenced by disproportionate impacts on energy production due to mismatch cases frequently. The occurrence of multiple maximum power points (MPPs) adds complexity to the tracking process in different PV systems. However, current Maximum Power Point Tracking (MPPT) techniques exhibit limited performance. This paper introduces an Enhanced simulated annealing (ESA) based GMPPT technique against multiple MPP issues in P-V curve with different PV system structures. The proposal can not only distinguish the global and local MPPs, but also performs fast convergence speed, high tracking accuracy detection of irradiance changing and restart ability. Moreover, the proposed global maximum power tracking algorithm can be applied in the central converter of DMPPT and hybrid PV system to meet different application scenarios. The effectiveness is verified by simulation and test results.

   Four-level double star multilevel converter for grid-connected photovoltaic systems
By Sebastian RIVERA [View]
[Download]

Abstract: Medium voltage grids are a suitable selection for the connection of high power applications.However, for certain applications, such as PV energy conversion systems or fast charging stations for PEVs, the DC voltages are limited to be below 1000 V, making difficult their connection to such grids without the use of a step-up transformer. Multilevel converters allow the grid connection of such DC loads, by connecting them in one of their multiple dc sources, however, due the nature of these applications unbalanced operation is inherent, and cannot be completely solved by the modulation stage, thus additional circuitry is required. On the other hand, the use of a multilevel converter provides higher efficiency in the power conversion stage, higher power quality and reduced stress on the switching devices, which is also beneficial due the power ratings being reached by the mentioned applications.This paper explores a four-level double star multilevel converter as interface for central or multistring inverter for grid-connected photovoltaic energy systems. The topology is capable of handling three PV arrays with different MPPT (with or without additional dc-dc converters), with the use of an additional balancing stage. The four-level output voltage improves the power quality of the PV energy conversion system, while reducing the grid filter size. This paper presents the operating principle of the converter, the control scheme and the simulation results, that show this topology can be an interesting alternative for large-scale PV plants.

   Modulation strategy for a multi-drive PV pumping system
By Javier RIEDEMANN [View]
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Abstract: A multiple drives solar-pumping system is presented in this paper. The system is based on a single-stage photovoltaic (PV) topology where an array of solar panels is connected to multiple inverters supplying equal centrifugal pumps. The inverters are operated to obtain maximum power from the PV system and a standard indirect vector control strategy is used to regulate the machines currents. Moreover a modulation strategy aiming to reduce the ripple of the inverters common DC link is presented. Simulations results are shown and discussed.

   Shade-Tolerant Photovoltaic Microinverter with Time Adaptive Seamless P-V Curve Sweep MPPT
By Dmitri VINNIKOV [View]
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Abstract: This paper proposes a novel approach to photovoltaic (PV) module level power electronics (MLPE). Functionally, it is a hybrid of PV power optimizer and microinverter with such key features as shadetolerant (or global) maximum power point tracking (MPPT), galvanic isolation, direct AC connectivity, PV module level monitoring and safety cut-off, flexibility of installation and PV power system sizing. Focus is on the realization of the shade-tolerant MPPT, which is a new feature of the PV microinverters. Explanations are provided both from the hardware and software point of view. The experimental results, challenges and possibilities of future development of the proposed approach are analyzed and discussed.

   Single Stage Soft-Switching Tri-port Converter For Integrating Renewable Source And Storage With Grid Through Galvanic Isolation
By Nishant BILAKANTI [View]
[Download]

Abstract: The paper presents a single stage soft-switching tri-port converter for integrating renewable sources like PV, and battery storage with grid through high-frequency isolation. The proposed tri-port converter can be easily configured to connect to single or three phase ac grids and is capable of realizing soft-switching across the entire range of operating load levels. The single stage approach reduces the semiconductor requirement rating while the soft-switching feature realizes higher efficiencies, compared with the state-of-art approach. This paper presents the concept, principle of operation, simulation and experimental results for this new topology.

   Takagi-Sugeno fuzzy logic applied to a photovoltaïc system for power maximization
By Bogdan COJOCARIU [View]
[Download]

Abstract: This paper deals with Takagi-Sugeno fuzzy logic applied to an autonomous photovoltaic system for power maximization. It includes a DC-DC buck converter state model connected between the PV panel and the loadin order to maximize the output power. The TS fuzzy MPPT controller is compared to the classical P&O andfuzzy Mandani algorithms. Results show that: thanks to its capacity to transform the non-linear system in a set oflocal linear sub-systems, Takagi-Sugeno approach leads to better performances.

EPE 2017 - DS1i: Solar Energy Systems I
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 - DS1i: Solar Energy Systems I
	[return to parent folder]

	An Open-Circuit Faults Diagnostic Algorithm for Solar Cell System By Li WANG	[View] [Download]
Abstract: In this paper, a multi-degree open-circuit faults diagnostic algorithm, for improving condition monitoring ability of spacecraft solar cell system, has been proposed. This algorithm combines the output parameter, output voltage, output current and the impedance of solar cell system under low frequency domain. The algorithm can be used to diagnose the degree of faults quantitively and quickly. The feasibility and accuracy of the method has been proven through simulation and experiment.

	Application of Enhanced Simulated Annealing GMPPT Algorithm for Different PV Systems in Mismatch By Feng WANG	[View] [Download]
Abstract: PV systems are influenced by disproportionate impacts on energy production due to mismatch cases frequently. The occurrence of multiple maximum power points (MPPs) adds complexity to the tracking process in different PV systems. However, current Maximum Power Point Tracking (MPPT) techniques exhibit limited performance. This paper introduces an Enhanced simulated annealing (ESA) based GMPPT technique against multiple MPP issues in P-V curve with different PV system structures. The proposal can not only distinguish the global and local MPPs, but also performs fast convergence speed, high tracking accuracy detection of irradiance changing and restart ability. Moreover, the proposed global maximum power tracking algorithm can be applied in the central converter of DMPPT and hybrid PV system to meet different application scenarios. The effectiveness is verified by simulation and test results.

	Four-level double star multilevel converter for grid-connected photovoltaic systems By Sebastian RIVERA	[View] [Download]
Abstract: Medium voltage grids are a suitable selection for the connection of high power applications.However, for certain applications, such as PV energy conversion systems or fast charging stations for PEVs, the DC voltages are limited to be below 1000 V, making difficult their connection to such grids without the use of a step-up transformer. Multilevel converters allow the grid connection of such DC loads, by connecting them in one of their multiple dc sources, however, due the nature of these applications unbalanced operation is inherent, and cannot be completely solved by the modulation stage, thus additional circuitry is required. On the other hand, the use of a multilevel converter provides higher efficiency in the power conversion stage, higher power quality and reduced stress on the switching devices, which is also beneficial due the power ratings being reached by the mentioned applications.This paper explores a four-level double star multilevel converter as interface for central or multistring inverter for grid-connected photovoltaic energy systems. The topology is capable of handling three PV arrays with different MPPT (with or without additional dc-dc converters), with the use of an additional balancing stage. The four-level output voltage improves the power quality of the PV energy conversion system, while reducing the grid filter size. This paper presents the operating principle of the converter, the control scheme and the simulation results, that show this topology can be an interesting alternative for large-scale PV plants.

	Modulation strategy for a multi-drive PV pumping system By Javier RIEDEMANN	[View] [Download]
Abstract: A multiple drives solar-pumping system is presented in this paper. The system is based on a single-stage photovoltaic (PV) topology where an array of solar panels is connected to multiple inverters supplying equal centrifugal pumps. The inverters are operated to obtain maximum power from the PV system and a standard indirect vector control strategy is used to regulate the machines currents. Moreover a modulation strategy aiming to reduce the ripple of the inverters common DC link is presented. Simulations results are shown and discussed.

	Shade-Tolerant Photovoltaic Microinverter with Time Adaptive Seamless P-V Curve Sweep MPPT By Dmitri VINNIKOV	[View] [Download]
Abstract: This paper proposes a novel approach to photovoltaic (PV) module level power electronics (MLPE). Functionally, it is a hybrid of PV power optimizer and microinverter with such key features as shadetolerant (or global) maximum power point tracking (MPPT), galvanic isolation, direct AC connectivity, PV module level monitoring and safety cut-off, flexibility of installation and PV power system sizing. Focus is on the realization of the shade-tolerant MPPT, which is a new feature of the PV microinverters. Explanations are provided both from the hardware and software point of view. The experimental results, challenges and possibilities of future development of the proposed approach are analyzed and discussed.

	Single Stage Soft-Switching Tri-port Converter For Integrating Renewable Source And Storage With Grid Through Galvanic Isolation By Nishant BILAKANTI	[View] [Download]
Abstract: The paper presents a single stage soft-switching tri-port converter for integrating renewable sources like PV, and battery storage with grid through high-frequency isolation. The proposed tri-port converter can be easily configured to connect to single or three phase ac grids and is capable of realizing soft-switching across the entire range of operating load levels. The single stage approach reduces the semiconductor requirement rating while the soft-switching feature realizes higher efficiencies, compared with the state-of-art approach. This paper presents the concept, principle of operation, simulation and experimental results for this new topology.

	Takagi-Sugeno fuzzy logic applied to a photovoltaïc system for power maximization By Bogdan COJOCARIU	[View] [Download]
Abstract: This paper deals with Takagi-Sugeno fuzzy logic applied to an autonomous photovoltaic system for power maximization. It includes a DC-DC buck converter state model connected between the PV panel and the loadin order to maximize the output power. The TS fuzzy MPPT controller is compared to the classical P&O andfuzzy Mandani algorithms. Results show that: thanks to its capacity to transform the non-linear system in a set oflocal linear sub-systems, Takagi-Sugeno approach leads to better performances.