Abstract: Taking the building integrated renewable energy system as the research project,a solar photovoltaic/thermal hybrid system for heat and power cogeneration are designed and optimized. Owing to the cascade conversion of solar energy to electric energy and thermal energy,the solar heat efficiency and total efficiency reach 49% and 79%,respectively. On this basis,virtual energy storage of the building is applied via active load control to reduce the capacity of thermal energy storage devices. Consequently,the proportion of stored thermal energy to building heat demand throughout the day decreases from 25.9%（without virtual energy storage）to 11.0%（with virtual energy storage）. Besides,the matching degree between solar heat supply and building heat load is improved. Namely,on-site energy fraction increases from 74% to 90%,and on-site energy matching increases from 74% to 89%.