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JACIII Vol.16 No.7 pp. 881-887
doi: 10.20965/jaciii.2012.p0881
(2012)

Paper:

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A Variable Step Size Incremental Conductance Direct MPPT Method for Stand-Alone PV Systems

Jae-Hoon Cho*1, Jin-Il Park*1, Won-Pyo Hong*2,
and Myung-Geun Chun*3,*4

*1Smart Logistics Technology Institute, Hankyong National University, 327 Chungang-ro, Anseong-si, Gyeonggi-do 456-749, Korea

*2Department of Building Science and Plant Engineering, Hanbat National University, 16-1 Dukmyung-dong, Yuseong-gu, Daejeon 305-719, Korea

*3College of Electrical and Computer Engineering, Chungbuk National University, 410 Seongbong-ro, Cheongju, Chungbuk 361-763, Korea

*4Corresponding author

Received:
October 5, 2012
Accepted:
November 5, 2012
Published:
November 20, 2012
Creative Commons License
Keywords:
direct maximum power point tracking, standalone photovoltaic, dc-dc converter, fuzzy membership
Abstract
This paper presents a variable step size incrementalconductance direct Maximum Power Point Tracking (MPPT) method using fuzzy membership for a standalone photovoltaic (PV) system under rapidly changing irradiation. MPPT techniques have been widely applied in PV systems to make a PV array generate maximum power, which depends on solar irradiation. In most applications of MPPT technologies, MPPT algorithm design methods are performed and tested under slowly changing atmospheric conditions such as irradiation and temperature. The short-term effect under rapidly changing irradiation should be considered, however, to improve the dynamic performance of PV system. Our proposed MPPT method is based on an incremental conductance algorithm with a direct control scheme that can directly adjust the duty cycle for the PI controller. A fuzzy membership function is adopted to determine the variable step size according to rapidly changing irradiation. The proposed methods thus has not only faster dynamic performance but also high tracking accuracy. In order to show the effect of the proposed method, the simulation model and proposed MPPT is designed with MATLAB/Simpower and simulated with MATLAB/Stateflow.
Cite this article as:
J. Cho, J. Park, W. Hong, and M. Chun, “A Variable Step Size Incremental Conductance Direct MPPT Method for Stand-Alone PV Systems,” J. Adv. Comput. Intell. Intell. Inform., Vol.16 No.7, pp. 881-887, 2012.
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