Maximum grid-connected inverter

What are the goals of grid-connected PV inverters?

Under grid voltage sags, over current protection and exploiting the maximum capacity of the inverter are the two main goals of grid-connected PV inverters. To facilitate low-voltage ride-through (LVRT), it is imperative to ensure that inverter currents are sinusoidal and remain within permissible limits throughout the inverter operation.

Does grid impedance affect power transfer capability of grid-connected inverter?

Huang, L.; Wu, C.; Zhou, D.; Blaabjerg, F. Grid impedance impact on the maximum power transfer capability of grid-connected inverter. In Proceedings of the IEEE 12th Energy Conversion Congress and Exposition—Asia (ECCE-Asia), Singapore, 24–27 May 2021. (Accepted for publication). [Google Scholar]

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.

How does grid voltage sag affect inverter capacity?

It can be observed from Fig. 6 d, 8 d and 10 d that under single-phase grid voltage sag, the injected inverter currents remain below the rated inverter capacity and the maximum exploitation of the inverter’s capacity is achieved.