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Grid-connected PV systems energy extraction improvement by means of an Electric Array Reconfiguration (EAR) strategy: Operating principle and experimental results

Published on Jun 1, 2008 in PESC (Power Electronics Specialists Conference)
· DOI :10.1109/PESC.2008.4592234
Guillermo Velasco Quesada9
Estimated H-index: 9
(UPC: Polytechnic University of Catalonia),
Francisco Guinjoan Gispert21
Estimated H-index: 21
(UPC: Polytechnic University of Catalonia),
Robert Piqué López6
Estimated H-index: 6
Abstract
This paper applies a dynamical electrical array reconfiguration (EAR) strategy on the PV modules of a grid-connected PV system based on a plant oriented (PO) configuration, in order to improve its energy production when the operating conditions of the solar panels are different, such as in the case of partial shadowing or module failure. The EAR strategy is carried out by inserting a controllable switching matrix between the PV generator and the central inverter, which allows the electrical reconnection of the available PV modules depending on their incident irradiance estimated values. As a result, the PV system exhibits a self-capacity for real-time adaptation to the PV generator external operating conditions in order to improve the energy extraction of the system. The paper details both the operating principle and a set of experimental results carried out on a 1.65 kWp EAR-based grid-connected system.
  • References (7)
  • Citations (34)
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This review focuses on inverter technologies for connecting photovoltaic (PV) modules to a single-phase grid. The inverters are categorized into four classifications: 1) the number of power processing stages in cascade; 2) the type of power decoupling between the PV module(s) and the single-phase grid; 3) whether they utilizes a transformer (either line or high frequency) or not; and 4) the type of grid-connected power stage. Various inverter topologies are presented, compared, and evaluated aga...
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#1Guillermo Velasco Quesada (University of Barcelona)H-Index: 9
#2J.J. Negroni (UPC: Polytechnic University of Catalonia)H-Index: 9
Last. Robert Piqué López (UPC: Polytechnic University of Catalonia)H-Index: 6
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Starting from a comparative study of the generated output power in several grid-connected PV system configurations, the work proposes a dynamic interconnection of photovoltaic (PV) modules depending on the irradiance distribution for a plant oriented configuration. Matlab/sup /spl reg// simulation results considering several static and dynamic irradiance distributions reveal that the maximum output power at the PV generator level obtained with this approach is similar to that obtained in the mod...
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#2J.J. NegroniH-Index: 9
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A dynamic interconnection of PV modules based on an irradiance equalization algorithm in grid-connected systems based on a plant oriented configuration is presented. The maximum output power at the PV generator level obtained with approach is similar to that obtained in the module integrated configuration
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As a short introduction on the general development and forecast of world market in photovoltaics (PV) are presented. The general classification introduces grid connected, stand alone, large scale and roof-top PV-systems. The core of presentation concentrates on the development and trends of converters for grid connected PV-systems. The novel multi-string converter is introduced representing one of the major trends in PV system technology towards modular PV-system design based on string converter...
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#2B. Pungsiri (Nippon Institute of Technology)H-Index: 1
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The acceleration from the starting state of a photovoltaic powered car is not favorable when compared with that of current automobiles. This results from the limitation of photovoltaic qualification. In this paper,a method of electrical array reconfiguration management which is appropriate for effectively driving a photovoltaic (PV) powered car is presented. For the purpose of increasing the acceleration, the methods of electrical array reconfiguration (EAR; parallel, series and parallel-series)...
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#1Z.M. SalamehH-Index: 1
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#1Hassan M. H. Farh (KSU: King Saud University)H-Index: 9
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Partial shading condition (PSC) has a bad effect not only on the shaded PV modules/arrays itself but also on the output power generated from the partially shaded photovoltaic (PSPV) system. It reduces the output power generated from the photovoltaic (PV) system and contributes in hot spot problem that may lead to thermal breakdown of shaded PV modules. Under PSC, multiple peaks, one global peak (GP) and many other local peaks (LPs) are generated in the P–V curve. This chapter concentrates on all...
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#1L. BouselhamH-Index: 3
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When the panels in a photovoltaic generator (PVG) are subjected to Partial Shading (PS), some bypass diodes may turn on, and consequently multiple peaks in the Power -Voltage (P-V) characteristic are produced which reduces the output power. For an optimal GPV power extraction, one of emerging PS mitigation techniques is to reconfigure the PVG by altering the electrical connections between panels according to prevailing conditions. This paper presents a reconfigurable PV architecture based on irr...
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#1G. Sai Krishna (KREC: National Institute of Technology, Karnataka)H-Index: 2
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Abstract Mismatch losses ignore the performance of individual photovoltaic (PV) modules and cut back most of the power from the PV array. These losses mainly due to partial shading condition (PSC), are caused by the reduction of spacing between PV modules, passing clouds, and near buildings, etc. Several techniques are present in the literature to cut back the partial shading issues. One of the most effective methods is the reconfiguration techniques, namely reconfigure the location of PV module...
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Photovoltaic (PV) system characteristics are significantly affected by shading conditions and thus the power productivity of the system is subject to vary accordingly. Therefore, this triggers the need for a broad understanding for the power losses caused by partial shading conditions (PSC). This paper presents an indicative analysis of various kinds of PV power losses associated with different shading scenarios that are likely to take place in real PV system based on MATLAB simulations. Further...
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Abstract The Photovoltaic (PV) systems are gaining popularity for both standalone and grid connected applications. These systems offer benefits of being static, modular, environmental friendly; and converts light from the Sun, which is perennial source of clean and green energy. The energy conversion in PV system is although instantaneous, yet less efficient because of optical and electrical losses. The optical loss caused by partial shading reduces a PV system output greatly, if not properly mi...
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