Modeling and control of photovoltaic energy conversion connected to the grid

doi:10.1007/s11708-012-0169-y

Front Energ

2012, Vol. 6

Issue (1) : 35-46 https://doi.org/10.1007/s11708-012-0169-y

RESEARCH ARTICLE

Modeling and control of photovoltaic energy conversion connected to the grid

Rebei NAJET(

), Ben Ghanem BELGACEM, Hasnaoui OTHMAN

Unit of Research (RME), INSAT, Tunisia; Centre Urbain Nord, BP 676, 1080 Tunis Cedex, Tunisia

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Abstract

This paper presents modeling and control of a photovoltaic generator (PVG) connected to the grid. The parameters of the PVG have been identified in previous work (series and parallel resistance, reverse saturation current and thermal voltage) using Newton-Raphston and the gradient algorithm. The electrical energy from a PVG is transferred to the grid via two static converters (DC/DC and DC/AC). The objective of the proposed control strategy is to maximize energy captured from the PVG. The adapted control law for extracting maximum power from the PVG is based on the incremental conductance algorithm. The developed algorithm has the capability of searching the maximum photovoltaic power under variable irradiation and temperature. To control the DC/AC inverter, an intelligent system based on two structures is constructed: a current source control structure and a voltage source control structure. The system has been validated by numerical simulation using data obtained from the PVG installed in the laboratory research (INSAT, Tunisia).

Keywords photovoltaic generator (PVG) maximum power point tracker grid-connected static converters

Corresponding Author(s): NAJET Rebei,Email:najet_r@yahoo.com

Issue Date: 05 March 2012

Cite this article:

Rebei NAJET,Ben Ghanem BELGACEM,Hasnaoui OTHMAN. Modeling and control of photovoltaic energy conversion connected to the grid[J]. Front Energ, 2012, 6(1): 35-46.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-012-0169-y
https://academic.hep.com.cn/fie/EN/Y2012/V6/I1/35

Fig.1 General diagram of grid connected PV system

Fig.2 Solar panels

Fig.3 Equivalent electrical-circuit for a real PV cell

Fig.4 Equivalent circuit

Fig.5 Vector diagram editing energy transfer network

Fig.6 Evolution of the production of the solar cells in the world

Fig.7 Voltage control of the transfer power

Fig.8 Current control of the transfer power

Fig.9 Flowchart of the proposed MPPT method

Fig.10 p=(p) characteristics of a PV cell

Fig.11 Comparison between the experimental curve and those calculated with the extracted parameters at 15°C

Fig.12 Comparison between the experimental . curves and those calculated with the extracted parameters at 32°C

Tab.1 Characteristics of the PV module

Tab.2 Evolution of , , and under different irradiance at =15°C

Tab.3 Evolution of , , and under different irradiance at =35°C

Fig.13 Evolution of active power (reference/measure) injected in the grid

Fig.14 Evolution of voltages (reference/measure) injected in the grid

Fig.15 Solar radiation

Fig.16 Variation of active and reactive power (reference/measure) injected in the grid

Fig.17 Evolution of voltages (reference/measure) injected in the grid

Fig.18 Inverter output voltage after and before filtering

Fig.19 Effeciency of transferred power to the grid with voltage control

Fig.20 Variation of active and reactive power (reference/measure) injected in the grid

Fig.21 Evolution of currents (reference/measure) injected in the grid

Fig.22 Zoom in evolution of currents (reference/measure) injected in the grid

Fig.23 Variation of active and reactive power (reference/measure) injected in the grid

Fig.24 Zoom in evolution of current (reference/measure) injected in the grid

Fig.25 Evolution of the current injected in the grid

Fig.26 Efficiency of the transferred power to the grid with current control

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