A planning model for the grid-connected hybrid power system based on the game theory is proposed through analysis of the characteristics of the wind power， photovoltaic generation and storage batteries in power industries. The players in the game model， i.e. wind power， photovoltaic generation and storage battery， maximize their own profits by choosing their capacities individually， taking into account the life cycle cost， the system reliability and the environment profits， etc. This paper discusses five different game scenarios， one non-cooperative game and four cooperative games， and illustrates the existence of their equilibriums. The analysis of the corresponding equilibriums indicates that the coalition values are all positive， and the payoffs of all the four cooperative games are larger than that of the non-cooperative game. It is also shown that the cooperation of wind power and photovoltaic generation is the best way to realize the reliable and cost effective generation.