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Research Papers

Comparative Evaluation of Maximum Power Point Tracking Methods for Photovoltaic Systems

[+] Author and Article Information
G. M. S. Azevedo, K. C. Oliveira, F. A. S. Neves, Z. D. Lins

Departamento de Engenharia Elétrica e Sistemas de Potência, Universidade Federal de Pernambuco, Rua Acadêmico Hélio Ramos, s/n, Cidade Universitária, Recife, Pernambuco 50740-530, Brazil

M. C. Cavalcanti

Departamento de Engenharia Elétrica e Sistemas de Potência, Universidade Federal de Pernambuco, Rua Acadêmico Hélio Ramos, s/n, Cidade Universitária, Recife, Pernambuco 50740-530, Brazilmarcelo.cavalcanti@ufpe.br

J. Sol. Energy Eng 131(3), 031006 (Jun 10, 2009) (8 pages) doi:10.1115/1.3142827 History: Received April 04, 2008; Revised September 26, 2008; Published June 10, 2009

This paper presents a study of two maximum power point tracking methods for grid connected photovoltaic systems. The best operation conditions for the perturbation and observation and the incremental conductance methods are investigated in order to identify the efficiency performances of these most popular maximum power point tracking methods for photovoltaic systems. Improvements of these methods can be obtained with the best adjustment of the sampling rate and the perturbation size, both in accordance with the converter dynamics. Practical aspects about the incremental conductance method are discussed, and some modifications are proposed to overcome its problems. A procedure to determine the parameters is explained. This procedure helps to identify which method is better suited for grid connected photovoltaic systems with only one conversion stage. The methods’ influences on the quality of the currents injected in the grid are evaluated and compared. The performance improvement achieved with the choice of the best parameters is proved by means of simulation and experimental results performed on a low power test system. The simulation results have been obtained by modeling a photovoltaic system in MATLAB . A simplified model was used that employs only parameters of interest and therefore decreases simulation time. Experimental results corresponding to the operation of a grid connected photovoltaic converter controlled with a digital signal processor have been obtained.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Equivalent circuit of the PV cell

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Figure 2

Grid connected PV system

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Figure 3

Block diagram of the dc link voltage control

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Figure 4

Simulation model for MPPT evaluation

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Figure 5

Characteristic of the output power of the PV module for S=1000 W/m2 and T=50°C

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Figure 6

Simulation results of the P&O technique

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Figure 7

Simulation results of the P&O technique—ΔV=5 V, TMPPT=4τvcc

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Figure 8

The flowchart of the Inc.Cond technique

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Figure 9

The modified flowchart of the Inc.Cond technique

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Figure 10

Coefficient Ĝ in function of irradiance and temperature

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Figure 11

Variation of (I/V+dI/dV) due to the voltage perturbation around VMPP

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Figure 16

Simulation and experimental results for Inc.Cond method

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Figure 17

Reference and dc Link voltages during tracking

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Figure 18

Reference voltage and grid current on phase a during perturbation

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Figure 15

Simulation and experimental results for PO method

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Figure 14

Grid currents using the P&O and Inc.Cond techniques

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Figure 13

Inc.Cond technique for ΔG=1.5 m℧, ΔV=5.0 V, TMPPT=4τvcc

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Figure 12

Inc.Cond technique for conditions of high and low ΔG

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