Power Generation Of Photovoltaic Array Research Articles

WITHDRAWN: Enhance Power Generation of PV Array under Partial Shading Conditions by a Lo Shu and Optimal SuDoKu Puzzle Fusion Topology

A novel Lo Shu and Optimal SuDoKu Puzzle Fusion Topology (LS-OSDKP) is presented to disperse shading effects and enhance photovoltaic (PV) array output power under partial shading conditions (PSCs). Incorporating the ancient Chinese Lo Shu magic square puzzle and the Optimal SDKP topologies, the proposed LS-OSDKP is capable of alleviating current mismatch losses, decreasing wiring loss, simplifying the P-V curves of the array, and significantly improving shading dispersion. Under six PSCs, the performance of the proposed topology was evaluated using a 9 × 9 PV array and compared to the total-cross-tied (TCT), Twisted Two-Step, SDKP, Optimal SDKP, and Lo Shu topologies. Simulation results confirmed that the proposed method could extract the highest averaged power of the PV array among the six topologies, with a 10.47% power improvement when compared to the TCT. Additionally, the LS-OSDKP is capable of effectively reducing the wiring length by 29.09% compared to the Lo Shu. Moreover, the proposed method has the highest potential for energy savings and revenue generation. Compared to the conventional TCT configuration, it could improve extracted energy by approximately 9.58% and shorten payback time by approximately 9.06%. Consequently, the advantages of the proposed LS-OSDKP topology include an increase in extracted power, a reduction in wiring loss, and a shorter energy payback period.

An adaptive two-step staircase static reconfiguration method for improving the power generation of PV array

Partial shading of solar photovoltaic (PV) panels can significantly affect the performance of solar PV arrays. Various reconfiguration techniques have been explored in recent years. Still, their applicability to actual PV power generation is controversial due to the number of electrical switches, physical locations, interconnections and complexity. This study proposes an adaptive two-step staircase (A2SS) static reconfiguration method. The technique is experimentally validated in several conditions and compared with the conventional TCT connection, single-step staircase (1SS) static reconfiguration method, Arrow soduku, modified odd–even–prime (MOEP) and two-step staircase(2SS) static reconfiguration method. For the eight shading cases of LN, LW, LD, Ran, Cen, Cor, CD, and Plus at SET#1, after reconfiguring the PV array using A2SS, the power has a significant improvement of 17.6%, 17.0%, 13.4%, 13.4%, 20.6%, 20.2%, 3.1%, and 0.82% than TCT. In the four shading cases of Lr. C, Lr. O, Lr. T, and Lr. U at SET#2, the power showed a significant improvement of 11.8%, 9.2%, 10.7%, and 15.8% compared to TCT. It also has the best performance in various reconfiguration techniques, which are mentioned. In addition, the A2SS reconfiguration method can be better applied to various sizes of PV arrays. By optimizing the shading distribution and adjusting the row irradiance deviation, the power stability of PV power generation is improved while maximizing energy efficiency.

Shade diffusion of partial shaded PV array by using odd-even structure

This paper proposes an improved permanent structuring technique to configure the panels in photo voltaic (PV) array so that optimum power output can be achieved under partial shading conditions. The proposed technique enables the structure to redistribute shading effect on complete PV array by using panel physical positions alternatively. The PV modules are connected in TCT configuration and this TCT configured array is structured based on ODD-EVEN pattern. The ODD-EVEN structures of panels don’t change electrical connections of TCT connected PV array. The rendition of proposed structure of PV array is investigated under various shading conditions. The proposed technique has resulted in an appreciably improved power generation of PV array at output terminals. The technique mitigates occurrence of multiple local maxima and thus avoids the necessity of complex maximum power point tracking algorithm. The simple and cost-effective PV array structure is the additional merit associated with this configuration.

The Impact Mitigation of Partial Shading on PV Array Power Generation

The impact of partial shading on photovoltaic (PV) array is discussed in this paper. The partial shading on PV array can significantly decrease the power generation of PV array. This study examines the modeling of PV module which relates with solar irradiation, temperature, and shading pattern. There are different shading patterns on PV array, such as one-string shading, two-strings shading, and much more. The characteristics of current-voltage (I-V) and voltage-power (V-P) curves for each individual the PV array can be different dependent on the multiple MPPs, maximum power points (MPPs). These multiple MPPs are basically lower than the MPP in case of no shading. Therefore, the total generated energy in an interested time period is usually reduced. As a result, this paper proposes the appropriate arrangement of PV modules in a PV array in order to mitigate the impact of partial shading. Finally, the proposed arrangement of PV modules is tested in a testing system. All the obtained results confirms that the proposed arrangement of PV modules is effective and can be applied in practice.