The Influence of Changing PV Array Interconnections under a Non-uniform Irradiance

Usually, the output characteristics of a photovoltaic (PV) array are significantly affected by non-uniform irradiance which is caused by ambient obstacles, clouds, orientations, tilts, etc. Some local maximum power points (LMPP) in the current-voltage (I-V) curves of a PV array can result in power losses of the array. However, the output power at the global maximum power point (GMPP) is different in different interconnection schemes in a PV array. Therefore, based on the theoretical analysis and mathematical derivation of different topological structures of a PV array, this paper investigated the output characteristics of dual series PV arrays with different interconnections. The proposed mathematical models were also validated by experimental results. Finally, this paper also concluded that in terms of performance, the total cross tied (TCT) interconnection was not always the optimal structure, especially in a dual series PV array. When one of the PV modules was severely mismatched, the TCT worked worse than the series parallel (SP) structure. This research can provide guidance for switching the interconnection to gain the greatest energy yield in a changeable- structure PV system.

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Cite this article

[IEEE Style]

K. Ding, L. Feng, S. Qin, J. Mao, J. Zhang, X. Wang, T. Peng, Q. Zhai, "The Influence of Changing PV Array Interconnections under a Non-uniform Irradiance," Journal of Power Electronics, vol. 16, no. 2, pp. 631-642, 2016. DOI: 10.6113/JPE.2016.16.2.631.

[ACM Style]

Kun Ding, Li Feng, Si-Yu Qin, Jing Mao, Jing-Wei Zhang, Xiang Wang, Tao Peng, and Quan-Xin Zhai. 2016. The Influence of Changing PV Array Interconnections under a Non-uniform Irradiance. Journal of Power Electronics, 16, 2, (2016), 631-642. DOI: 10.6113/JPE.2016.16.2.631.