Due to the inverter used, DG can not only integrate the active power into power grid but also support the grid with reactive power. This paper proposes an optimal configuration methodology of renewable DG so as to maximize the penetration level of DG considering the temporal characteristics of active-reactive power (P-Q). Further, the uncertainty output of the wind generator, photovoltaic and small hydropower is taken into account by forming typical scenarios based on the cluster analysis of historical data. Simulation on a modified IEEE33-bus distribution system show that a significant increase in maximum penetration can obtain by considering the reactive power of DGs.