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Energies 2017, 10(1), 120; doi:10.3390/en10010120

Analysis of Dynamic Characteristic for Solar Arrays in Series and Global Maximum Power Point Tracking Based on Optimal Initial Value Incremental Conductance Strategy under Partially Shaded Conditions

1
College of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
2
School of Electrical Engineering, Tianjin University of Technology, Tianjin 300384, China
3
College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China
*
Author to whom correspondence should be addressed.
Academic Editor: Senthilarasu Sundaram
Received: 21 November 2016 / Revised: 31 December 2016 / Accepted: 12 January 2017 / Published: 19 January 2017
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Abstract

Partial shading (PS) is an unavoidable condition which significantly reduces the efficiency and stability of a photovoltaic (PV) system. With PS, the system usually exhibits multiple-peak output power characteristics, but single-peak is also possible under special PS conditions. In fact it is shown that the partial shading condition (PSC) is the necessary but not sufficient condition for multiple-peak. Based on circuit analysis, this paper shows that the number of peak points can be determined by short-circuit currents and maximum-power point currents of all the arrays in series. Then the principle is established based on which the number of the peak points is to be determined. Furthermore, based on the dynamic characteristic of solar array, this paper establishes the rule for determination of the relative position of the global maximum power point (GMPP). In order to track the GMPP within an appropriate period, a reliable technique and the corresponding computer algorithm are developed for GMPP tracking (GMPPT) control. It exploits a definable nonlinear relation has been found between variable environmental parameters and the output current of solar arrays at every maximum power point, obtained based on the dynamic performance corresponding to PSC. Finally, the proposed method is validated with MATLAB®/Simulink® simulations and actual experiments. It is shown that the GMPPT of a PV generation system is indeed realized efficiently in a realistic environment with partial shading conditions. View Full-Text
Keywords: photovoltaic (PV); dynamic characteristic; necessary condition; global maximum power point tracking (GMPPT); partial shading condition (PSC) photovoltaic (PV); dynamic characteristic; necessary condition; global maximum power point tracking (GMPPT); partial shading condition (PSC)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhao, J.; Zhou, X.; Ma, Y.; Liu, Y. Analysis of Dynamic Characteristic for Solar Arrays in Series and Global Maximum Power Point Tracking Based on Optimal Initial Value Incremental Conductance Strategy under Partially Shaded Conditions. Energies 2017, 10, 120.

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