Study on maximum power point tracking of photovoltaic array in irregular shadow |
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| Affiliation: | 1. School of Information and Engineering, China University of Mining and Technology, 221008 Xuzhou, China;2. Department of Mechanical and Electrical Engineering, Xuzhou College of Industrial and Technology, 221140 Xuzhou, China;1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, Jiangsu 210098, China;2. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing, Jiangsu 210098, China;3. Key Laboratory of Engineering Sediment of Ministry of Transport, Tianjin Research Institute for Water Transport Engineering, M.O.T, Tianjin 300456, China;4. Faculty of Civil Engineering, University of Transport and Communications, Hanoi, Vietnam;1. Babe?-Bolyai University, Faculty of Physics, 400084 Cluj-Napoca, Romania;2. Université Grenoble Alpes, Institut Néel, Grenoble F 38042, France;3. CNRS, Institut Néel, Grenoble F 38042, France;1. School of Electrical and Computer Engineering, Ajou University, Suwon, Republic of Korea;2. Department of Computer Science and Engineering, Hanyang University, Ansan, Republic of Korea;1. Faculty of Materials & Manufacturing Processes, Malek-Ashtar University of Technology, Tehran, Iran;2. Material and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, Tehran, Iran |
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| Abstract: | Traditional maximum power point tracking (MPPT) methods can hardly find global maximum power point (MPP) because output characteristics curve of photovoltaic (PV) array may have multi local maximum power points in irregular shadow, and thus easily fall into the local maximum power point. To address this drawback, Considering that sliding mode variable structure (SMVS) control strategy have such advantages as simple structure, fast response and strong robustness, and P&O method have the advantages of simple principle and convenient implementation, so a new algorithm combining SMVS control method and P&O method is proposed, besides, PI controller is applied to reduce system chattering caused by switching sliding surface. It is applied to MPPT control of PV array in irregular shadow to solve the problem of multi-peak optimization in partial shadow. In order to verity the rationality of the proposed algorithm, the experimental circuit is built, which achieves MPPT control by means of the proposed algorithm and P&O method. The experimental results show that compared with the traditional P&O algorithm, the proposed algorithm can fast track the global MPP, tracking speed increases by 60% and the relative error decreased by 20%. Moreover, the system becomes more stable near the MPP, the fluctuations of output power is greatly reduced, and thus make full use of solar energy. |
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| Keywords: | Photovoltaic (PV) array Irregular shadow Maximum power point tracking (MPPT) Sliding mode variable structure (SMVS) control Perturbation and observation (P&O) method PI controller |
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