Browsing by Author "Sai Krishna, G.S."

Now showing 1 - 4 of 4

Comparative Study on Solar Photovoltaic Array Configurations under Irregular Irradiance Conditions
(IEEE Computer Society help@computer.org, 2018) Sai Krishna, G.S.; Moger, T.
Power delivered by a Photovoltaic (PV) cell decreases significantly due to non-uniform irradiance condition. Consequently, in case of PV module or array, the generated output power get reduces and further deteriorates the overall system performance. Many solutions have been reported to reduce partial shadings. Among all, PV array configurations is the effective solution for this problem. Various PV array configurations are mentioned in the literature to mitigate partial shading condition (PSC). This paper presents the comparative study on PV array configurations reported in the literature such as Â»Series-Parallel (SP), Total-Cross-Tied (TCT), Bridge-Link (BL), Honey-Comb (HC), Modified Bridge-Link (MB), hybrid SP-TCT, hybrid BL-TCT along with proposed hybrid HC-TCTÂ» under partial shading conditions on 4 4 PV array. Further, the performances of all configurations areÃ—investigated by comparing the global maximum power point (GMPP), voltage at the global maximum power (VGMPP ), fill-factor (FF) and possible local peaks (PLP) by using MATLAB-SIMULINK. Â© 2018 IEEE.
Enhanced power generation for total-cross-tied pv array using simulated annealing under partial shading conditions
(John Wiley and Sons Inc, 2020) Sai Krishna, G.S.; Moger, T.
Shade phenomena affect the PV module's power output, introduce multiple peak points in PV characteristics, and shorten the expected life cycle of the module. In order to prevent this issue, PV modules should reconfigure, namely, altering the electrical connections between PV modules based on the irradiance without changing their physical locations. As a result, the shading effects can distribute over the array and increase power output. This paper proposed a novel reconfiguration technique based on the simulated annealing algorithm to distribute shading impacts on 9×9 total-cross-tied (TCT) PV array. In this work, the proposed algorithm produces a reconfigured connection matrix for 9×9 TCT array that can minimize the current differences in each row and improve the power output. Various shading conditions have been taken to investigate the proposed technique by obtained global maximum power point (GMPP), current at GMPP, power loss, fill-factor, and efficiency. Further, the performance of the proposed technique is validated with other existing reconfiguration methods under partial shadings. In comparison with existing methods, the result shows that the proposed simulated annealing enhanced the power generation of the TCT array under all shading patterns. © The Institution of Engineering and Technology 2020.
Modelling and Analysis of PV array Connections under Non-Uniform Irradiance Conditions
(Institute of Electrical and Electronics Engineers Inc., 2021) Sai Krishna, G.S.; Moger, T.
Partial shading is the most significant factor affecting the PV array's maximum power production. Interconnection between PV modules in different styles inside the array is one way to mitigate this issue. The literature reported that PV modules can be connected in 'simple-series (SS), series-parallel (SP), total-cross-tied (TCT), bridge-link (BL) and honey-comb (HC)' ways to reduce partial shadings. Under the influence of shading, however, the modelling and analysis of PV array connections is a difficult task. Therefore, this work presents modelling and analysis of PV array connections under partial shadings. The performance of each PV array connection is analysed under different shading conditions on 9\times 9 array in this work, and further, comparative study has been performed by obtained various index parameters. As per the study, it is identified that the TCT and BL PV arrays are showing better results under all considered shading conditions compared to other connections. Â© 2021 IEEE.
SuDoKu and Optimal SuDoKu Reconfiguration for TCT PV array under Non-Uniform Irradiance Condition
(Institute of Electrical and Electronics Engineers Inc., 2018) Sai Krishna, G.S.; Moger, T.
Power delivered by a Photovoltaic (PV) array reduces significantly due to non-uniform irradiance condition. The reduction of output power is not directly proportional to the shading area but depends on the shading pattern, array configuration and the physical location of modules in PV array. Many techniques have been reported in the literature to reduce partial shading effects. One of the effective technique is reconfiguration strategies. This paper presents the comparative study on SuDoKu and optimal SuDoKu reconfiguration techniques for 9\times 9 Total-Cross-Tied (TCT) PV array under partial shading condition (PSC). In this approach, the physical location of modules in TCT PV array are changing based on SuDoKu and optimal SuDoKu patterns without altering any electrical connections. In addition to this, the performance analysis is carried out by comparing the global maximum power point (GMPP) and voltage at the global maximum power (V-{GMPP}) under different shading conditions by using MATLAB-SIMULINK. Â© 2018 IEEE.