Document Type : Original Article
Authors
Yazd University, Yazd, Iran.
10.22044/rera.2026.17583.1521
Abstract
Photovoltaic systems consist of multiple modules connected in series and parallel to produce a specific current and voltage. These modules may experience partial shading, leading to increased power losses, the formation of hot spots, reduced system performance, and physical damage to the modules. Various configurations are presented for connecting modules to each other, each offering advantages in mitigating partial shading effects. This paper proposed a novel configuration called the Step configuration, inspired by the architecture of adjacent buildings sharing a common staircase. This configuration improves the output power of the system under all partial shading patterns. The method is simple, easy to implement, and cost-effective, ensuring lower power losses and higher reliability under partial shading conditions. The approach is tested on a 6×6 sample array and a 14×6 real power plant under various partial shading conditions in MATLAB/Simulink and compared with conventional configurations. According to the test results, the Step configuration generates higher output power compared to other configurations, and uses less wiring compared to total-cross-tied (TCT) configuration, although there is a slight difference in their output power.
Keywords
Main Subjects
[1] Gielena, D., Boshella, F., Saygin, D., Bazilian, M.D., Wagner, N. & Gorini, R. (2019). The role of renewable energy in the global energy transformation, Energy Strategy Reviews, vol. 24, pp. 38–50.
[2] Yousri, D., Thanikanti, S.B., Balasubramanian, K., Osama, A. & Fathy, A. (2020). Multi-objective grey wolf optimizer for optimal design of switching matrix for shaded PV array dynamic reconfiguration, IEEE Access, vol. 8, pp. 159931–159946.
[3] Sinke, W.C. (2019). Development of photovoltaic technologies for global impact, Renewable Energy, vol. 138, pp. 911–914.
[4] Satpathy, P.R., Babu, T.S., Mahmoud, A., Sharma, R. & Nastasi, B. (2021). A TCT-SC hybridized voltage equalizer for partial shading mitigation in PV arrays, IEEE Transactions on Sustainable Energy, vol. 12, no. 4, pp. 2268–2281.
[5] Parida, B., Iniyan, S. & Goic, R. (2011). A review of solar photovoltaic technologies, Renewable & Sustainable Energy Reviews, vol. 15, pp. 1625–1636.
[6] Sharma, S., Varshney, L. & Elavarasan, R.M. (2021). Performance enhancement of PV system configurations under partial shading conditions using MS method, IEEE Access, vol. 9, pp. 56630-56644.
[7] Ahmad, R., Murtaza, A.F., Sher, H.A., Shami, U.T. & Olalekan, S. (2017). An analytical approach to study partial shading effects on PV array supported by literature, Renewable & Sustainable Energy Reviews, vol. 74, pp. 721–732.
[8] Teo, J.C., Tan, R.H.G., Mok, V.H., Ramachandaramurthy, V.K. & Tan, C. (2020). Impact of bypass diode forward voltage on maximum power of a photovoltaic system under partial shading conditions, Energy, vol. 191.
[9] Pourderogar, H., Harasii, H., Alayi, R., Delbari, M. Sadeghzadeh, S.H. & Javaherbakhsh, A. (2019). Modeling and technical analysis of solar tracking system to find optimal angle for maximum power generation using MOPSO algorithm, Renewable Energy Research and Application (RERA), vol. 1, no. 2, pp. 211-222.
[10] Rajani, K. & Ramesh, T. (2021). Maximum power enhancement under partial shadings using a modified Sudoku reconfiguration, CSEE Journal of Power and Energy Systems, vol. 7, no. 6, pp. 1187-1201.
[11] Rafiqnaze, M.N. (2021). Scenario-based investigation on the effect of partial shading condition patterns for different static solar photovoltaic array configurations, IEEE Access, vol. 9, pp. 116050-116072.
[12] Srinivasan, A. (2021). L-shape propagated array configuration with dynamic reconfiguration algorithm for enhancing energy conversion rate of partial shaded photovoltaic systems, IEEE Access, vol. 9, pp. 97661-97674.
[13] Valkealahti, S. & Maki, A. (2013). Effect of photovoltaic generator components on the number of MPPs under partial shading conditions, IEEE Transactions on Energy Conversion, vol. 28, no. 4, pp. 1008-1017.
[14] D’Alessandro, V., Guerriero, P. & Daliento, S. (2014). A simple bipolar transistor-based bypass approach for photovoltaic modules, IEEE Journal of Photovoltaics., vol. 4, no. 1, pp. 505–513.
[15] Peng, B.R., Ho, K.C. & Liu, Y. H. (2018). A novel and fast MPPT method suitable for both fast changing and partially shaded conditions, IEEE Transactions on Industrial Electronics, vol. 65, no. 4, pp. 3240–3251.
[16] Alajmi, B.N., Ahmed, K.H., Finney, S.J. & Williams, B.W. (2013). A maximum power point tracking technique for partially shaded photovoltaic systems in microgrids, IEEE Transactions on Industrial Electronics, vol. 60, no. 4, pp. 1596–1606.
[17] Pankaj, V., Bharat, G., Gaurav, J. & Ravi, H. (2024). A new global maximum power point algorithm for dynamic shading patterns of partial shading, Renewable Energy Research and Application (RERA), vol. 5, no. 2, pp. 211-220.
[18] Mohapatra, M.A., Mohapatra, A., Nayak, B., Das, P. & Mohanty, K.B. (2017). A review on MPPT techniques of PV system under partial shading condition, Renewable & Sustainable Energy Reviews, vol. 80, pp. 854–867.
[19] Mikkili, S. (2018). Modeling, simulation, and performance analysis of PV array configurations (series, series-parallel, bridge linked, and honey-comb) to harvest maximum power under various partial shading conditions, International Journal of Green Energy, vol. 15, no. 13, pp. 795–812.
[20] Devakirubakaran, S., Verma, R., Chokkalingam, B. & Mihet-Popa, L. (2023). Performance evaluation of static PV array configurations for mitigating mismatch losses, IEEE Access, vol. 11, pp. 47725-47749.
[21] Rajani, K. & Ramesh, T. (2022). Reconfiguration of PV arrays (T-C-T, B-L, H-C) considering wiring resistance, CSEE Journal of Power and Energy Systems, vol. 8, no. 5, pp. 1408–1416.
[22] Pachauri, R.K., Kansal, I., Babu, T.S. & Alhelou, H.H. (2021). Power losses reduction of solar PV systems under partial shading conditions using re-allocation of PV module-fixed electrical connections, IEEE Access, vol. 9, pp. 94789-94812.
[23] Mallick, P., Sharma, R., Satpathy, P.R., Thanikanti, S.B. & Nwulu, N.I. (2023). A dimension-independent array relocation (DIAR) approach for partial shading losses minimization in asymmetrical photovoltaic arrays, IEEE Access, vol. 11, pp. 63176-63196.
[24] Saiprakash, C., Mohapatra, A., Nayak, B., Babu, T.S. & Alhelou, H.H. (2022). A novel benzene structured array configuration for harnessing maximum power from PV array under partial shading condition with reduced number of cross ties, IEEE Access, vol. 10, pp. 129712-129726.
[25] Palpandian, M., Winston, D.P., Kumar, B.P., Kumar, C.S., Babu, T.S. & Alhelou, H.H. (2021). A new ken-ken puzzle pattern based reconfiguration technique for maximum power extraction in partial shaded solar PV array, IEEE Access, vol. 9, pp. 65824-65837.
[26] Ramesh, T., Rajani, K. & Panda, A.K. (2021). A novel triple-tied-cross-linked PV array configuration with reduced number of cross-ties to extract maximum power under partial shading conditions, CSEE Journal of Power and Energy Systems, vol. 7, no. 3, pp. 567-581.
[27] Kumar, B.P. (2022). Performance enhancement of partial shaded photovoltaic system with the novel screw pattern array configuration scheme, IEEE Access, vol. 10, pp. 1731-1744.
[28] Horoufiany, M. & Ghandehari, R. (2018). Optimization of the Sudoku based reconfiguration technique for PV arrays power enhancement under mutual shading conditions, Solar Energy, vol. 159, pp. 1037-1046.
[29] Bingol, O. & Ozkaya, B. (2018). Analysis and comparison of different PV array configurations under partial shading conditions, Solar Energy, vol. 160, pp. 336-343.
[30] Niti, A. (2025) Performance of partially shaded series-parallel and total-cross-tied configured PV array, Renewable Energy Research and Applications (RERA), vol. 6, no. 1, pp. 61-73.
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