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Installed solar power has recently grown dramatically in Taiwan. When a large amount of solar power is integrated into a grid, its impacts on existing power systems must be analyze. Currently, the maximum solar power capacity is installed in Central Taiwan Science Park, and the highest penetration of Photovoltaics (PV) is in Penghu Island, Taiwan. Therefore, this paper studies the effects of increased PV installation capacity in these two locations in Taiwan, with respect to both steady-state and dynamic performances. First, a charged system search (CSS) algorithm is applied to determine the optimal PV installed capacity at chosen buses, considering the need to minimize transmission loss and voltage variation. System impact analysis is then performed on the new system with increased PV capacity. The effect of PV low-voltage-ride-through (LVRT) capability on system dynamic performance is further analyzed.