In recent years

with the rapid development of the rooftop photovoltaic in China

the capacity credit of photovoltaic power generation is an important index to measure its effect on power system reliability. For the villas with the rooftop photovoltaic power generation system and the electric vehicles

the capacity credit and capacity credibility are calculated. Firstly

with the static cooperative game theory

the relationship between the photovoltaic

the electric vehicles and the residents are analyzed. Taking the expected non-served value power as objective function

the minimum winning coalition algorithm is adopted. Secondly

the photovoltaic installed capacity is optimized by obtaining the highest capacity credibility value. Finally

the validity and feasibility of the proposed capacity optimization method is verified by the example system. The results show that the rooftop photovoltaic capacity credibility can be improved through configuring the rooftop photovoltaic with appropriate capacity

raising the input of electric vehicles and reducing the load peak and valley difference.