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A hybrid global MPPT scheme based on power closed-loop scanning and P&O method

Author(s): Li Shanshoua,b , Zhang Xinga , Gu Juna *
a HeFei University of Technology, No.193 of Tunxi Road, Hefei 230009, China
b Anhui Jianz hu University, No.292 of Ziyun Road, Hefei 230601, China
International Journal of Smart Grid and Clean Energy, vol. 4, no. 4, October 2015: pp. 291-298
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.4.4.291-298

Abstract: This paper presents a hybrid Global Maximum Power Point Tracking (GMPPT) method. Firstly, an improved global scanning method is presented, which overcomes the difficulty to determine the power step size in "power closed-loop scanning (PCS)”. Secondly, an improved P&O method is employed as the steady-state tracking method, in which some improvement measures was proposed for eliminating the problem of the steady-state oscillation and the dynamic misjudging. Thirdly, a novel restarting strategy is proposed, which happens with a novel criterion for judging the environment change. At last, some comparative experiments with other GMPPT algorithms are presented to highlight the significance of the presented approach.
Keywords: Partial shading, Global Maximum Power Point Tracking (GMPPT), Power Closed-Loop Scanning (PCS), Perturb and Observe (P&O) method

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