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The PV current contains high frequency components when an arc occurs. The DC component is eliminated when the current passes the current sensor, leaving only the AC components. The arc can be quickly identified with the help of FFT and AI analysis. The arc detection signal is also instantly switched from low to high level.
The availability of low-cost and high-performance silicon combined with innovative detection algorithms enables developers to implement reliable safety mechanisms without false detects. As arc detection technology gains traction in the solar industry, other industries will begin to require it as well.
Figure 9: Arc detection can be added into a variety of high-voltage applications to mitigate the risks associated with high voltages. In an electrical vehicle, for example, arc detection can monitor the high-voltage DC busses between the primary batteries and inverter stages that are known to be a common cause of catastrophic vehicle fires.
From Fig. 17, the detection time is less than 200 ms. Fig. 17. Experiment result when an arc happens. When an arc occurs, Fig. 18 displays another experiment outcome. From it, the PV current contains high frequency components when an arc occurs. The sensor eliminates the DC component, leaving only the AC components.
Fonrich (ShangHai) New Energy Technology Co., Ltd. was fournded in 2011, with a technology-oriented focus on PV new energy field, our products cover PV Smart Module Level Safety IProtection
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