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In this paper a direct method to estimate maximum power points (MPPs) in PV arrays subjected to mismatching conditions is presented. The method uses the lossless single-diode model (SDM) which is parameterized using the data of inflection and maximum power points of each panel. The reconstruction of power vs. voltage curve is obtained by one explicit equation, thus avoiding the use of recursive non-linear...
Most of the large-scale PV power plants are based on central inverters, in which the PV panels are concentrated in single or few MPPTs and connected to the grid through three-phase inverters. Although its high conversion efficiency, extracting the total available power from an association of a large number of PV panels represents an issue in these systems. The irregular shading effects added to the...
The z source inverter is a moderately modern power converter topology that has been established in the prose to exhibit voltage-buck and voltage-boost capability. In this proposed system z source theory can be applied to two-level inverters. Two level z source inverter receiving the power supply from photovoltaic system. Output voltage of z source inverter produce twice increased of applied input...
Renewable Energy Sources are gaining momentum and are consistently increasing their footprint in the power sector due to increased awareness of environmental impacts from widespread utilization of fossil fuels. Solar-energy-based photovoltaic (PV) systems are quickly growing source of distributed generation (DG) and are connected to the power distribution system. The advancement in the field of power...
Power amplifier suitable for booster of small-size nonlinear power source such as photovoltaic (PV) cells is presented. The amplifier is developed to simulate large size of nonlinear power source and is utilized to examine various PV power systems. The amplifier is simple and compact to carry. Principle of PV cell booster with the amplifier is described. Prototype of the amplifier utilized as PV cell...
To optimize performance of dense array concentrator photovoltaic (CPV) system, we have acquired real time flux distribution pattern using novel optical scanner and then fed the data to computational modeling algorithm for the sake of designing optimized configuration of dense-array layout. As a case study, a prototype of non-imaging planar concentrator (NIPC) capable of producing reasonable uniform...
Performance of Photovoltaic (PV) system is greatly dependent on the solar irradiation and operating temperature. Due to partial shading condition, the characteristics of a PV system considerably change and often exhibit several local maxima with one global maxima. Conventional Maximum Power Point Tracking (MPPT) techniques can easily be trapped at local maxima under partial shading. This significantly...
A photovoltaic (PV) array performance depends on various operating conditions. Solar irradiation is considered the most important factor. The shading on PV array can result from passing clouds, trees, utility, telephone poles, or neighboring buildings. It causes not only power losses, but also increases non-linearity of V-I characteristics of PV array. This phenomenon has been studied in many research...
This paper proposes a MATLAB Simulink simulator for photovoltaic (PV) system. The main contribution of this work is the utilization of the two-diode model to represent the PV cell. This model is known to have better accuracy at low irradiance level which allows for a more accurate prediction of PV system performance. To reduce computational time, the input parameters are reduced to four and the values...
A generalized photovoltaic array simulation model in Matlab/Simulink environment is developed and presented in this paper. The model includes PV module and array for easy use on simulation platform. The proposed model is designed with a user-friendly icon and a dialog box like Simulink block libraries. This makes the generalized PV model easily simulated and analyzed even with a maximum power point...
This paper presents an improved mathematical and simulation model for Solar Photovoltaic (PV) cells and compares it to an existing model. The model is able to simulate both the I-V characteristics curves and the P-V characteristics curves. The model is used to study different parameters variations effects on the PV array including operating temperature and solar irradiation level The results of the...
This paper reviews the PVUSA power rating method and presents two additional methods that seek to improve this method in terms of model precision and increased seasonal applicability. It presents the results of an evaluation of each method based upon regression analysis of over 12 MW of operating photovoltaic (PV) systems located in a wide variety of climates. These systems include a variety of PV...
The techno-economic optimum sizing of a stand-alone photovoltaic (PV) system is a basic requirement for its proliferation. One of the primary concerns in designing a stand-alone PV system is the determination of an optimum relationship between the PV array and storage battery capacity to supply the required energy at a specified energy load fraction. In this paper, a complete analytical methodology...
This paper presents a maximum power point tracker method using sliding mode control for a photovoltaic module to produce and maintain the maximum power possible for a configuration of the array and the environmental variables. This is obtained using a variable structure control system to control the duty cycle of a DC-DC converter. The variable structure control system is a sliding mode control that...
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