Simulation Analysis of Really Occurred Accident Caused by Short Circuit Failure of Blocking Diode and Bypass Circuit in the Photovoltaics System

Ishikura, Norio; Okamoto, Tomoki; Nanno, Ikuo; Hamada, Toshiyuki; Oke, Shinichiro; Fujii, Masayuki

doi:10.1109/icrera.2018.8566896

Cited by 13 publications

(3 citation statements)

References 8 publications

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“…The aforementioned heat-generation process involves a reverse current that is notably larger than that regularly generated in a short-circuited bypass diode. Therefore, attention should be given to the high risk of bypass diode burnout [10]. Effective measures for such reverse currents include installing fuses, not just reverse-current blocking diodes.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, if a reverse-current blocking diode fails in addition to the bypass diode within a PV array, the inverse current from the sound PV array flows into the short-circuited bypass diode, increasing the risk of heat generation and burnout [9]. Therefore, it is important to ascertain the characteristics of bypass diode failure owing to indirect lightning in mechanisms wherein the bypass diode may generate heat and burnout [10]. However, the detailed failure characteristics of the bypass diode that fail because of indirect lightning surges are not clear.…”

Section: Introductionmentioning

confidence: 99%

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Breakdown Characteristics of Schottky Barrier Diodes Used as Bypass Diodes in Photovoltaic Modules under Lightning Surges

Hamada,

Nanno,

Ishikura

et al. 2023

Energies

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Damage to photovoltaic power-generation systems by lightning causes the failure of bypass diodes (BPDs) in solar cell modules. Bypass diodes damaged by lightning experience high-resistance open- or short-circuit failures. When a bypass diode experiences short-circuit failure due to indirect lightning, the damage may not be immediately visible. When solar radiation is subsequently received, the current circulating in the closed circuit formed by the cell string and short-circuited bypass diode flows, resulting in overheating and burnout of the short-circuited bypass diode. The authors’ research group previously reported that when a bypass diode fails within a range of approximately 10−1 Ω to 10 Ω, the heat generated by the failed bypass diode is high, posing the risk of burnout. However, the detailed failure characteristics of the bypass diode that fail because of indirect lightning surges are not clear. In this study, we performed indirect lightning fracture tests and clarified the dielectric breakdown characteristics of Schottky barrier diodes (SBDs) contained in the bypass diodes of photovoltaic solar cell modules, which are subjected to indirect lightning surges. Furthermore, we attempted to determine the conditions of indirect lightning that resulted in a higher risk of heat and ignition. As a result, short-circuit failures occurred in all the Schottky barrier diodes that were destroyed in the forward or reverse direction because of the indirect lightning surges. Moreover, the fault resistance decreased as the indirect lightning surge charge increased. These results indicate that the risks of heat generation and burnout increase when the Schottky barrier diode fails with a relatively low electric charge from an indirect lightning surge. In addition, we observed that for a forward breakdown of the Schottky barrier diode, the range of the indirect lightning surge that results in a fault condition with a higher risk of heat generation and burnout is wider than that for a reverse breakdown.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Breakdown Characteristics of Schottky Barrier Diodes Used as Bypass Diodes in Photovoltaic Modules under Lightning Surges

Hamada,

Nanno,

Ishikura

et al. 2023

Energies

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“…The recent study showed simulation results that damaged bypass diodes by lightning strikes to lead reverse current flowed from normal string to the failed string, which generates heat and burns out. [11,12]. Furthermore, bypass diodes can deteriorate due to the high temperature of thermal runaway by rapid transitioning from forwarding bias state to reverse bias [12,13,14].…”

Section: Bypass Diode Faultmentioning

confidence: 99%

Simulation of fault detection in photovoltaic arrays

Lipták

Bodnár

2021

Anal. Tech. Szeged.

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In solar systems, faults in the module and inverter occur in proportion to increased operating time. The identification of fault types and their effects is important information not only for manufacturers but also for investors, solar operators and researchers. Monitoring and diagnosing the condition of photovoltaic (PV) systems is becoming essential to maximize electric power generation, increase the reliability and lifetime of PV power plants. Any faults in the PV modules cause negative economic and safety impacts, reducing the performance of the system and making unwanted electric connections that can be dangerous for the user. In this paper have been classified all possible faults that happen in the PV system, and is presented to detect common PV array faults, such as open-circuit fault, line-to-line fault, ground fault, shading condition, degradation fault and bypass diode fault. In this studies examines the equivalent circuits of PV arrays with different topological configurations and fault conditions to evaluate the effects of these faults on the performance of a solar system, taking into account the influence of temperature and solar radiation. This work presents the validation of a simulated solar network by measuring the output curves of a low-power photovoltaic array system under real outdoor conditions. This method can be useful in future solar systems.

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Characteristics of Failed Bypass Diodes for Photovoltaic Module by Artificial and Natural Lightning

Hamada

Nakamoto

Nanno

et al. 2019

Lecture Notes in Electrical Engineering

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Simulation Analysis of Really Occurred Accident Caused by Short Circuit Failure of Blocking Diode and Bypass Circuit in the Photovoltaics System

Cited by 13 publications

References 8 publications

Breakdown Characteristics of Schottky Barrier Diodes Used as Bypass Diodes in Photovoltaic Modules under Lightning Surges

Breakdown Characteristics of Schottky Barrier Diodes Used as Bypass Diodes in Photovoltaic Modules under Lightning Surges

Simulation of fault detection in photovoltaic arrays

Characteristics of Failed Bypass Diodes for Photovoltaic Module by Artificial and Natural Lightning

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