PV inverter reactive power regulation range

How to manage voltage violation in PV inverters?

The conventional way of coping with voltage violation is disconnection of the PV systems or curtailment of the generated power. To address this issue, a novel configuration for voltage management in a radial feeder via regulated reactive power capability in PV inverters is presented.

Do inverters provide reactive power at full power?

Inverters used for solar PV and wind plants can provide reactive capability at partial output, but any inverter-based reactive capability at full power implies that the converter need to be sized larger to handle full active and reactive current.

What is a reactive range?

At partial power, reactive capability must be up to the MVAr range at rated power, or at least the required range at rated power scaled by the ratio of active power to rated power. The reactive range must be met at the voltage profile established by ERCOT.

Do solar PV inverters need Dynamic Reactive support?

Sometimes, external dynamic reactive support is required to assist with voltage ride-through compliance. During periods of low wind or solar resource, some generators in the plant may be disconnected from the grid. The DC voltage for solar PV inverters may limit the reactive power capability of the inverters.

How much power can a PV inverter produce?

Like inverter-based wind generators, PV inverters are typically designed to operate within 90% to 110% of rated terminal voltage. Reactive power capability from the inverter, to the extent that is available, varies as a function of terminal voltage.

Does a PV plant need a reactive power range?

In the case of PV, a requirement to maintain reactive power range at full output represents a change with respect to historical industry practice. This cost impact could be substantial if the PV plant relies on the PV inverters to provide a portion or all of the required plant-level reactive power capability.