Abstract:

Photovoltaics, energy storage, direct current, and flexibility (PEDF), a new building power distribution system, is an important way to "carbon peak and carbon neutralization". Amid the vigorous commitment to distributed photovoltaic pilots based on county seats, the utilization mode of photovoltaic and system capacity allocation in rural residential buildings need to be further explored. Based on the utilization mode of roof PV, this paper proposes two topologies of PEDF systems for rural residential buildings, self-priority and public PV. The system performance of different topologies with various photovoltaic and energy storage capacity configurations is compared and analyzed from technological and economical perspectives. A simulation of a distribution station composed of 18 rural households from a village in Beijing shows that the public PV system is suitable for high PV installed capacity. The load satisfaction rate can be increased by 0.3-1.9%, and the annual net income by CNY 17,000. While the self-priority PV system is suitable for low PV installed capacity. The load satisfaction rate and photovoltaic consumption rate can be increased by 1.0~3.0 percentage points and 0.6~2.7 percentage points, respectively. In the actual project, the system optimization selection can be combined with the investment operator, and the regulation and storage capacity of the flexible resources in the buildings can be fully used to improve the system stability and cost-effectiveness, which can help construct the new power system mainly fueled by renewable energy.

Key words: rural residential building, PEDF, topologies, capacity configuration, energy storage cost