What is a photovoltaic power plant?

Photovoltaic (PV) plants, as typical renewable energy, are widely integrated with the power system [4, 5]. In developing countries such as China, connecting large-scale PV plants has continuously strengthened the decarbonization capability of the power grid.

Can Superconducting fault current limiters improve the LVRT capability of PV plants?

This is because the LVRT can prevent PV plants from being immediately disconnected during grid faults, which helps avoid slower recovery and extended power outages. Hence, this work proposes to enhance the LVRT capability of the PV plant using superconducting fault current limiters (SFCLs).

Can SFCLs be used if a PV plant is grid-connected?

Compared with the single-circuit transmission line scenarios, the fault current will be much higher in the double-circuit transmission line scenarios, which can trigger the SFCLs to present a sizeable current-limiting impedance. Hence, the SFCLs can be utilized when the PV plant is grid-connected via double-circuit transmission lines.

What happens if a grid fault causes a PV plant to sag?

Nevertheless, when a grid fault occurs and causes a voltage sag at the point of common coupling (PCC), the inverter of the PV plant may experience excessive DC voltages and AC currents. This poses a risk of the inverter burning out, leading to the PV plant being disconnected as a protective measure.

How does a superconducting coil work?

The AC coils are connected in series to the transmission lines, and the superconducting coil can supply DC through the magnetization circuit without any power loss. During normal operation, the DC supply provides an exciting current to the superconducting coil. Thus, the coil generates a biased magnetic field, deeply saturated the iron cores.

Can a fault cause a short-circuit fault in a PV plant?

Additionally, when PV plants are grid-connected via double-circuit transmission lines, a fault on one line can cause significant short-circuit fault current from the grid through the other line, posing a substantial challenge to power equipment such as breakers, which existing research also struggles to address effectively. Table 1.