研究目的
To investigate the impact of lightning on the bypass diode (BPD) in a photovoltaic module (PV-MDL) and to clarify the lightning-induced BPD failure mechanism.
研究成果
The study demonstrated that BPDs in a PV module containing a metal frame fail at distances of 0.15 m or less from the lightning current, while those without a metal frame failed at distances as far as 0.4 m away. All BPD failures associated with the induced lightning were characterized as short circuit failures, and the failure resistance of the BPDs decreased as they were placed closer to the impulse current. The metal frame of the PV module was shown to suppress the induced current, reducing the negative impact of lightning strikes.
研究不足
The study focused on the impact of induced lightning on BPDs and did not consider the effects of direct lightning strikes or other environmental factors. The impulse current waveform used in the test had a rise time of about 20 μs, which may not fully represent all lightning strike scenarios.
1：Experimental Design and Method Selection:
An impulse current test was conducted to simulate a lightning strike near the PV-MDL. The impulse current with a peak of 100 kA was used to simulate the direct current lightning.
2：Sample Selection and Data Sources:
CS-236B31 (18 cells 3 clusters) was used as the PV-MDL. The BPD used was FSQ 30A045, with a repetitive peak reverse voltage of 45 V and a forward current of 30 A.
3：List of Experimental Equipment and Materials:
A current surge generator (ICG-200K; Otowa Denki Co., Ltd.) was used to generate the impulse current.
4：Experimental Procedures and Operational Workflow:
The PV-MDL was directed vertically to the ground and in the same direction as the impulse current. The output end of the PV-MDL was kept open to eliminate the adverse inductive effect of wires, and the light-receiving surface was shielded.
5：Data Analysis Methods:
The current–voltage (I–V) characteristics of the BPD were analyzed to determine the failure mechanism.
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