CAISO experience with impact of high penetration of renewable resources on short-term voltage stability

Positive impact on transient voltage performance from inverter-based generation - better damping and faster voltage recovery due to low inertia and faster controls (if a PV plant regulates voltage). For large system studies, very detailed models of the generators are not necessary. Without Low Voltage Ride Through Capability (for example, with large amount of distributed solar PV), loss of large amount of generation with a fault may be a concern. High voltages under normal system conditions may be a concern with large penetration of distributed solar PV generation.