Technical FAQs 4

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.

How to limit inverter output currents?

A well-established method to limit the inverter output currents is curtailing the reference signal feeding into the cur-rent controller.

What happens if an inverter is limiting current?

harmonics in the inverter output voltage and currents or compromising the small-signal stability. And it does not end here. The altered dynamic behavior of the inverter during current limiting also afects the entire power system to which it is connected.

How many control levels does a grid-side inverter have?

The strategy consists of 2 coordinated control levels: 1. AC Level Control Manages the grid-side inverter to provide positive and negative sequence voltage support while limiting overcurrent and DC-link voltage oscillation.

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Control strategy for current limitation and maximum capacity

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