Modeling and maximum power point tracking (MPPT) method for PV array under partial shade conditions |
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| Affiliation: | 1. Institut UTINAM UMR CNRS 6213, Université de Franche-Comté, UFR Sciences et Techniques, 16 Route de Gray, 25030 Besançon Cédex, France;2. Solaronix SA, 129, rue de l''Ouriette, 1170 Aubonne, Switzerland;1. College of Mechanical Engineering, Chongqing University, Chongqing 400044, China;2. College of Economics and Management, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;3. Weichai Power Co., Ltd., WeiFang 261041, China;1. Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47907, USA;2. Biobased Products and Energy Center, Department of Biosystems & Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078, USA;1. Dipartimento di Ingegneria dell''Impresa, Università degli Studi di Roma “Tor Vergata”, Via del Politecnico 1, 00133 Roma, Italy;2. Dipartimento di Ingegneria Meccanica ed Aerospaziale, “Sapienza” Università degli Studi di Roma, Via Eudossiana 18, 00184 Roma, Italy |
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| Abstract: | Influenced by partial shade, PV module aging or fault, there are multiple peaks on PV array's output power–voltage (P–V) characteristic curve. Conventional maximum power point tracking (MPPT) methods are effective for single peak P–V characteristic under uniform solar irradiation, but they may fail in global MPP tracking under multi-peak P–V characteristics. Existing methods in literature for this problem are still unsatisfactory in terms of effectiveness, complexity and speed. In this paper, we first analyze the mathematical model of PV array that is suitable for simulation of complex partial shade situation. Then an adaptive MPPT (AMPPT) method is proposed, which can find real global maximum power point (MPP) for different partial shade conditions. When output characteristic of PV array varies, AMPPT will adjust tracking strategies to search for global peak area (GPA). Then it is easy for conventional MPPT to track the global MPP in GPA. Simulation and experimental results verify that the proposed AMPPT method is able to find real global MPP accurately, quickly and smoothly for complex multi-peak P–V characteristics. Comparison analysis results demonstrate that AMPPT is more effective for most shade types. |
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| Keywords: | Photovoltaic(PV) array Maximum power point tracking (MPPT) Partial shade Global maximum power point (MPP) |
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