Читать книгу Smart Solar PV Inverters with Advanced Grid Support Functionalities - Rajiv K. Varma - Страница 38

The active power generated by solar PV systems can modify the loading levels on the connected feeders [21]. They can partially or completely offset the existing loads on distribution feeders, which results in a reduced power import on the feeder from the grid. They can also increase power flow in certain segments of a distribution feeder causing overload conditions. Presently employed voltage control devices which have been optimized for their size, location, and performance based on the existing loading patterns will no longer provide the same voltage regulation performance as originally planned [26]. These need to be re‐optimized.

It is further important to examine if the feeder sections connecting the substation to DERs have enough power carrying capacity and also whether the intervening switchgear have adequate ratings to accommodate this additional DER power.

Reconductoring may be needed to allow the power flow from solar PV systems. In some cases, when large solar PV systems are to be connected, a dedicated feeder may be needed to avoid the adverse impacts of a conventional solar PV connection [21]. Such a dedicated feeder without any loads can be directly connected to the substation. It may be noted that such reconductoring or network upgrades are quite expensive and time consuming to implement.