Photovoltaic solar panel arc

Due to the numerous wires on the DC side of the PV system, arc faults are more likely to occur. The figure illustrates the different types of arc faults that can occur within photovoltaic systems.

The undetected grounding faults will then be contributed to parallel arc faults, but it is better to prevent them by improving the detection and protection of grounding faults. Therefore, the relevant standards and codes are mainly focused on series arc fault detection and protection in PV systems.

Typical structure of PV systems. There are mainly two types of arc faults in PV system: series and parallel (including grounding arc fault) arc fault. Parallel and grounding arc fault often draw a large amount of fault current because of the sizeable different potential, which is easier to be detected by traditional protection devices, .

Any arc fault in PV panels can cause variation of the reflection coefficient because of the changing arc impedance, which means the reflected signal from the fault terminal will change over time as well. Then, SSTDR is introduced to calculate the autocorrelation value using both V + and V to detect arc faults.

However, the improper installation, non-frequently scheduled maintenance, and aging effect can accelerate the deterioration of PV system components, which directly increase the possibility of arc fault occurrence. The undetected arc faults pose a severe fire hazard to residential, commercial, and utility-scaled PV systems.

There are three main types of the electric arc model that can be used for simulation: physical principles-based model, traditional V-I empirical models obtained from measurement data, and heuristic models. A summary of arc model that can be used for arc fault simulation in PV system can be found in Table 1. Table 1.