PV Power Output Control Improving Transient Stability of Power System with a Large Penetration of PV

Abstract

SUMMARY Because of energy and environmental policies in the last decade, a lot of photovoltaic (PV) generations have been installed into power systems in Japan in recent years. In this situation, it is of great concern that disconnection of PV due to voltage drop caused by a system fault has a critical impact on power system stability. To avoid its disconnection, Fault Ride Through (FRT) requirement is applied for PVs. In this paper, PV power output control which improves transient stability of the power system with a huge amount of PVs is proposed and its effectiveness is confirmed by the numerical simulations.

Power Factor Control of Photovoltaic Generation Output for Improving Transient Stability

“…However, if a large amount of PVs is installed, it is concerned that the simultaneous stop of PVs due to system disturbance such as an instantaneous voltage drop causes system unbalance so that the stability of main system is influenced badly. In order to reduce this influence, the grid interconnection regulation regulates that a function to continue PV operation during instantaneous voltage drop (FRT: fault ride through) should be installed on PVs, where the FRT function is known to contribute toward enhancing transient stability . It is also known that voltage stability can be improved if a dynamic voltage support (DVS) function which utilizes reactive power control function of PV inverters is introduced .…”