The integration of photovoltaic (PV) and energy storage systems into official buildings has garnered considerable attention, which are recognized as DC power sources. Notably, DC power can satisfy the majority of electrical demands in official buildings. The primary objective of this research is to enhance overall system efficiency by efficiently utilizing renewable energy through direct current (DC) power distribution compared to alternating current (AC) systems. This study proposes a techno-economic analysis framework to guide designers in selecting system configuration and voltage levels. The analysis covers various PV capacities, load compositions, and battery capacities, with the aim of optimizing power distribution efficiency and achieving a more competitive levelized cost of energy (LCOE). The proposed model integrates the dynamic efficiency of actual converters and wire gauges, enabling real-time computation of the energy supply–demand balance within the power distribution system, including associated conversion and transmission losses. The results indicate that conversion loss accounts for approximately 80% of the overall energy loss within power distribution networks. The implementation of DC power distribution significantly improves system efficiency and economic viability. Specifically, the DC375 system exhibits superior techno-economic performance in scenarios involving high PV and battery capacities. In scenarios with limited PV and battery capacity, the building power distribution system should employ a hybrid AC-DC topology to efficiently distribute the available PV output to building loads powered by DC.

中文翻译：

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基于实时分析方法的官方建筑中不同直流配电网络的技术经济性能


将光伏 （PV） 和储能系统集成到官方建筑中引起了相当大的关注，这些系统被公认为直流电源。值得注意的是，直流电源可以满足官方建筑的大部分电力需求。与交流 （AC） 系统相比，本研究的主要目标是通过直流 （DC） 配电有效利用可再生能源，从而提高整体系统效率。本研究提出了一个技术经济分析框架，以指导设计人员选择系统配置和电压电平。该分析涵盖各种光伏容量、负载组成和电池容量，旨在优化配电效率并实现更具竞争力的平准化度电成本 （LCOE）。所提出的模型集成了实际转换器和线规的动态效率，能够实时计算配电系统内的能源供需平衡，包括相关的转换和传输损耗。结果表明，转换损耗约占配电网络内总能量损耗的 80%。直流配电的实施显著提高了系统效率和经济可行性。具体来说，DC375 系统在涉及高 PV 和电池容量的场景中表现出卓越的技术经济性能。在 PV 和电池容量有限的情况下，建筑配电系统应采用混合 AC-DC 拓扑，以有效地将可用的 PV 输出分配给由直流供电的建筑负载。