Study on the impact of under voltage ride through charactertics of larger PV penetrations on the system transient stability

With the increasing demand of electricity, many countries have been moving towards interconnecting the renewable energy to the existing power grid. In this framework, photovoltaic energy has been most popular. In this work, the impact of grid connected photovoltaic (PV) on the system transient stability is assessed by numerical simulation using matlab/simulink. The effect of under voltage ride through (UVRT) characteristics of different PV penetration levels on the system transient stability is investigated via 9-bus 3 machine test system. Result shows that as we increase the size of PV installation into the grid, critical clearing times (CCT) are proportionally increased. CCT increase is more favorable to enhance the power system transient stability.