Optimal bypass diode configuration for PV arrays under shading influence

Duong, Minh Quan; Sava, Gabriela Nicoleta; Ionescu, Gabriela; Necula, Horia; Leva, Sonia; Mussetta, Marco

doi:10.1109/eeeic.2017.7977526

Cited by 17 publications

(10 citation statements)

References 8 publications

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“…The outputs were compared by configurating a PV cell based on the nonlinear I-V characteristics of a solar cell, KVL (Kirchhoff's Voltage Law), and KCL (Kirchhoff's Current Law) or the series and parallel connection of the solar cells [7,8]. Furthermore, the I-V characteristics of the PV module and arrays by the configuration of bypass diodes and shading ratio were calculated from a conventional simulation tool [9,10]. Additionally, it has been reported that developing a new type of bypass diode or circuit, the electrical and thermal characteristics of the PV module were improved [11,12].…”

Section: Introductionmentioning

confidence: 99%

Origin of Bypass Diode Fault in c-Si Photovoltaic Modules: Leakage Current under High Surrounding Temperature

Shin

Song

et al. 2018

Energies

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Bypass diodes have been widely utilized in crystalline silicon (c-Si) photovoltaic (PV) modules to maximize the output of a PV module array under partially shaded conditions. A Schottky diode is used as the bypass diode in c-Si PV modules due to its low operating voltage. In this work, we systematically investigated the origin of bypass diode faults in c-Si PV modules operated outdoors. The temperature of the inner junction box where the bypass diode is installed increases as the ambient temperature increases. Its temperature rises to over 70 °C on sunny days in summer. As the temperature of the junction box increases from 25 to 70 °C, the leakage current increases up to 35 times under a reverse voltage of 15 V. As a result of the high leakage current of the bypass diode at high temperature, melt down of the junction barrier between the metal and semiconductor has been observed in damaged diodes collected from abnormally functioning PV modules. Thus, it is believed that the constant leakage current applied to the junction caused the melting of the junction, thereby resulting in a failure of both the bypass diode and the c-Si PV module.

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Section: Introductionmentioning

confidence: 99%

Origin of Bypass Diode Fault in c-Si Photovoltaic Modules: Leakage Current under High Surrounding Temperature

Shin

Song

et al. 2018

Energies

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“…The prime aim of the control method is to feed the power generated by solar PV array into the grid at the power factor of unity. Blocking diode and bypass diode [21,23] are used with solar PV array for optimal performance during partially shaded solar PV array.…”

Section: System Configurationmentioning

confidence: 99%

“…A thorough review of literature for ‘strategies for control for the solar PV integration with grid systems’ shows lately, research studies have introduced a variety of adaptive control techniques [11–41], such as control based on learning, adaptive fuzzy control, control based on power delta method etc. Still, their results on different abnormal conditions of distribution grid performance are not reported, which is an important parameter to deal with.…”

Section: Introductionmentioning

confidence: 99%

Intuitive control technique for grid connected partially shaded solar PV‐based distributed generating system

Kumar

Saxena

Singh

et al. 2020

IET Renewable Power Generation

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In this study, an intuitive control technique based on 'fifth-order generalised-integrator (FOGI)' is proposed for gridconnected solar photovoltaic (PV) energy conversions system (SECS). In the grid-tied SECS, a single-phase single-stage topology is considered. Moreover, on solar PV array, partially shaded condition is considered, where for global maximum power point tracking, the human psychology optimisation is utilised. The prime intention of the control technique is, feed all the generated solar power at the unity power factor into the grid, which is successfully achieved by the FOGI-based control method. During the evaluation of the performance of control based on FOGI, different adverse conditions related to the grid and dynamic change of solar insolation are considered, where the proposed control technique's performance illustrates the fulfilment of the motive of the work.

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“…This problem has a negative effect on the output power captured where it may be decreased by 70% [1]. Furthermore, hot spot and thermal breakdown problems may occur, where the protection of the PV modules using bypass diodes is inevitable [2][3][4][5][6]. Mitigation of the PS effects and tracking the global maximum power (GMP) available from the PV system under PS is a very hot research area because it can improve the power system quality, reliability and overall efficiency of the partially shaded PV (PSPV) systems [7,8].…”

Section: Introductionmentioning

confidence: 99%

Interleaved boost converter for global maximum power extraction from the photovoltaic system under partial shading

Farh

Eltamaly

Al-Saud

2019

IET Renewable Power Generation

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Partial shading (PS) condition has a negative effect on the shaded photovoltaic (PV) modules/arrays itself. In addition, it reduces the output power generated considerably. The PV system configuration represents one of the effective solutions to alleviate the PS effects and extract the global maximum power (GMP) available from the partially shaded PV (PSPV) system. This study introduces a detailed performance analysis and comparisons of four proposed PV system configurations [module integrated converter (MIC), multi-strings interfaced interleaved boost converter (MSIBC), multi-arrays interfaced IBC and single array single converter (SASC)] in terms of output power generated and mismatch loss (MML) index. The selection of the best PV system configuration, which not only mitigates the PS effects but also extracts the GMP available from the PSPV system, depends on a trade-off between the generated power, cost and complexity before judging which one is preferable. Although the MIC PV system has the highest output power generated (33 kW) and MML (100%), it increases the PV system complexity. Whereas, MSIBC has the second highest output power generated (28 kW) and MML compared to MIC. SASC has the lowest generated power and MML among the four configurations. The finding proves that MSIBC has superior performance compared to the other PV system configurations considering both the technical and economic assessment.

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Optimal bypass diode configuration for PV arrays under shading influence

Cited by 17 publications

References 8 publications

Origin of Bypass Diode Fault in c-Si Photovoltaic Modules: Leakage Current under High Surrounding Temperature

Origin of Bypass Diode Fault in c-Si Photovoltaic Modules: Leakage Current under High Surrounding Temperature

Intuitive control technique for grid connected partially shaded solar PV‐based distributed generating system

Interleaved boost converter for global maximum power extraction from the photovoltaic system under partial shading

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