Photovoltaic inverter drive overcurrent

What is over current protection mechanism in PV inverter?

As previously discussed, the simultaneous injection of peak active power from PVs and reactive power into the grid for voltage support can trigger the over current protection mechanism in PV inverter. The triggering of over current protection will lead to disconnection of inverter from the grid which is unfavourable during LVRT period.

Can a PV module be connected without an overcurrent device?

Possible cost savings. Two strings of PV modules may be connected to a single utility-interactive inverter input without an overcurrent device if the inverter cannot backfeed currents into the dc array wiring. The amount of inverter backfeed current, or lack thereof, is (or should be) included in the inverter specifications.

How to avoid over current in PV inverters during fault-ride-through period?

Hence, to avoid over current in PV inverters during fault-ride-through period, active power curtailment is necessary. The authors have formulated an expression to evaluate pseudo inverter capacity (PIC) for over current limitation as in (25). $$PIC= \frac {1-VUF} { {u}_ {base}}\times {u}^ {+}\times S$$

Do photovoltaic power systems need overcurrent protection?

Photovoltaic power systems, like other electrical power systems, require overcurrent protection for conductors, bus bars, and some equipment. However, some of the electrical sources in PV systems are unique when compared with the typical utility source provided by the utility grid.

Why does a PV inverter have an overvoltage problem?

The first is the overcurrent which may arise at the AC-side of the inverter in addition to the overvoltage of the DC-link in the DC-side. This issue occurs because of the inequality between the incoming energy from the PV side and the energy delivered into the electric grid (Perpinias et al., 2015).

Why is AC-side inverter overvoltage important?

First, the AC-side inverter overcurrent in addition to DC-side (DC-link) overvoltage. The unbalance in the flow of energy from the PV side and electric grid creates this issue . Second, the injection of reactive current, which is vital for voltage recovery and supporting the power system to tackle the fault incidents .