Power limitation occurs during inverter operation

How is maximum exploitation of the inverter's capacity achieved?

It is clearly evident that maximum exploitation of the inverter’s capacity is achieved due to simultaneous injection of active and reactive power without curtailing the active power as shown in Fig. 8 d.

Why is transient current limitation important in a GFM inverter?

Transient current limitation is critical during the first cycles after the sag. Unlike GFL inverters, GFM inverters behaving as voltage sources will be prone to overcurrents due to the voltage difference between the inverter terminal and the PCC voltage.

What are the performance criteria for inverter limiting methods?

With this approach, we evaluate various performance criteria for different limiting methods, such as fault current contribution, voltage support, stability, and post-fault recovery. We also discuss the latest standards and trends as they require inverter dynamics under off-nominal conditions and outline pathways for future developments.

How to provide voltage support in PV inverter?

To provide voltage support at the PCC, reactive power is injected into the grid under fault conditions as per the specified grid codes. 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.