EPE Association: EPE 2013 - LS5b: Photovoltaic Converters and their Control

EPE 2013 - LS5b: Photovoltaic Converters and their Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 15: Non-rotating power generation and storage systems > EPE 2013 - LS5b: Photovoltaic Converters and their Control

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   A Novel Global MPPT Algorithm for Distributed MPPT Systems
By Stefan DARABAN, Dorin PETREUS, Cristina MOREL, Mohamed MACHMOUM [View]
[Download]

Abstract: This paper is focused on the implementation of an original algorithm for global maximum power pointtracking (GMPPT) in photovoltaic systems. The algorithm detects when partial shading occurs, thuseliminating unwanted voltage sweeping. The paper gives a detailed analysis on how the algorithmsucceeds in finding the global maximum power point (GMPP) in a short time and all its highlights.The system is controlled by a DSP which implements a voltage and a current loop for a better responseof the system in case of a luminosity step change. Simulation and experimental results are finallyprovided to verify the performance of the system.

   Convergence analysis and tuning of Ripple Correlation based MPPT: a sliding mode approach
By Alessandro COSTABEBER, MAURO ZIGLIOTTO, Matteo CARRARO [View]
[Download]

Abstract: The development of fast MPPT (Maximum Power Point Tracking) algorithms for photovoltaic (PV)systems able to track variable irradiation conditions with high bandwidth is becoming attractive,especially for mobile applications. This paper focuses on the well known ripple correlation technique,proposing an analysis that provides an upper bound to the convergence time in response to solarirradiation steps. The availability of an upper bound enables the prediction of the dynamic behaviourof the MPPT, and gives a set of guidelines for a proper tuning of the controller to fit specific dynamicrequirements. The analysis is based on a simple application of sliding control theory, and it alsoincludes chattering phenomena and the effects of parasitic reactive elements of the PV module. Matlabsimulation and experimental tests are provided on a 35W panel interfaced to a 24V battery through aboost converter. A controllable LED illuminator has been used as solar generator, able to provideirradiation step changes with a bandwidth of 1kHz. The results confirm the effectiveness of both theanalysis and tuning.

   Current-Mode Bi-directional Single-Inductor Three-Port DC-DC Converter for Portable Systems with PV Power Harvesting
By Yue WEN [View]
[Download]

Abstract: This work targets low-power portable electronic applications with PV power harvesting. A bidirectional dc-dc converter is required to interface the battery with the load and PV module. A new current-mode scheme is applied to the single-inductor three-port converter, where the peak and valley inductor current are controlled by two separate digital regulation loops. The controller is shown to regulate both the PV voltage and the load voltage in the presence of load and irradiance steps. In solar deficit mode, energy is transferred from the battery to the load indirectly through the PV node, eliminating the two input switches used in conventional dual-input, dual-output converters. The scheme is demonstrated on a digitally controlled 1 W harvester prototype.

EPE 2013 - LS5b: Photovoltaic Converters and their Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 15: Non-rotating power generation and storage systems > EPE 2013 - LS5b: Photovoltaic Converters and their Control
	[return to parent folder]

	A Novel Global MPPT Algorithm for Distributed MPPT Systems By Stefan DARABAN, Dorin PETREUS, Cristina MOREL, Mohamed MACHMOUM	[View] [Download]
Abstract: This paper is focused on the implementation of an original algorithm for global maximum power pointtracking (GMPPT) in photovoltaic systems. The algorithm detects when partial shading occurs, thuseliminating unwanted voltage sweeping. The paper gives a detailed analysis on how the algorithmsucceeds in finding the global maximum power point (GMPP) in a short time and all its highlights.The system is controlled by a DSP which implements a voltage and a current loop for a better responseof the system in case of a luminosity step change. Simulation and experimental results are finallyprovided to verify the performance of the system.

	Convergence analysis and tuning of Ripple Correlation based MPPT: a sliding mode approach By Alessandro COSTABEBER, MAURO ZIGLIOTTO, Matteo CARRARO	[View] [Download]
Abstract: The development of fast MPPT (Maximum Power Point Tracking) algorithms for photovoltaic (PV)systems able to track variable irradiation conditions with high bandwidth is becoming attractive,especially for mobile applications. This paper focuses on the well known ripple correlation technique,proposing an analysis that provides an upper bound to the convergence time in response to solarirradiation steps. The availability of an upper bound enables the prediction of the dynamic behaviourof the MPPT, and gives a set of guidelines for a proper tuning of the controller to fit specific dynamicrequirements. The analysis is based on a simple application of sliding control theory, and it alsoincludes chattering phenomena and the effects of parasitic reactive elements of the PV module. Matlabsimulation and experimental tests are provided on a 35W panel interfaced to a 24V battery through aboost converter. A controllable LED illuminator has been used as solar generator, able to provideirradiation step changes with a bandwidth of 1kHz. The results confirm the effectiveness of both theanalysis and tuning.

	Current-Mode Bi-directional Single-Inductor Three-Port DC-DC Converter for Portable Systems with PV Power Harvesting By Yue WEN	[View] [Download]
Abstract: This work targets low-power portable electronic applications with PV power harvesting. A bidirectional dc-dc converter is required to interface the battery with the load and PV module. A new current-mode scheme is applied to the single-inductor three-port converter, where the peak and valley inductor current are controlled by two separate digital regulation loops. The controller is shown to regulate both the PV voltage and the load voltage in the presence of load and irradiance steps. In solar deficit mode, energy is transferred from the battery to the load indirectly through the PV node, eliminating the two input switches used in conventional dual-input, dual-output converters. The scheme is demonstrated on a digitally controlled 1 W harvester prototype.