The Time Sequential Simulation Based Energy Efficiency Comparison of AC and DC Distribution Power System in Commercial Buildings
Li Haibo1, Zhao Yuming2, Liu Guowei2, Jiang Shiyong3, Zhao Zhengjia1
1. Tsinghua Sichuan Energy Internet Research Institute Chengdu 610213 China; 2. Shenzhen Power Supply Bureau Co. Ltd Shenzhen 518020 China; 3. Zhuhai Geli Electrical Appliances Co. Ltd Zhuhai 519070 China
Abstract：With the advantage of integrating distributed energy, storage and DC load by higher efficient manner, DC distribution has attracted wide attention of the building electrical industry in recent years. Considering the large amount of commercial buildings and their enormous energy-saving potential, selecting AC or DC distribution is one of the key factors affecting their energy efficiency and operation economy so that it is urgent to carry out energy efficiency comparison between AC and DC distribution systems in buildings. However, the existing study on energy efficiency evaluation of distribution network has not fully considered the particularity of the load type in commercial buildings. The evaluation methods and indicators are not applicable. To address this issue, considering the typical structure and load type of AC and DC distribution in commercial buildings, the piecewise linear efficiency function of converters and dynamic line power loss model are established. Then the energy efficiency evaluation method is proposed based on time sequential simulation and branch power flow calculation. The case studies are conducted based on the demonstration project of DC power distribution in Shenzhen China-US Center. The results show that the load type of commercial buildings has an important influence on the energy efficiency level of AC and DC distribution systems. With the increase of DC load proportion and integration capacity of distributed resources, the energy efficiency advantage of DC distribution systems gradually increases.
李海波, 赵宇明, 刘国伟, 蒋世用, 赵政嘉. 基于时序仿真的商业楼宇交流与直流配电系统能效对比[J]. 电工技术学报, 2020, 35(19): 4194-4206.
Li Haibo, Zhao Yuming, Liu Guowei, Jiang Shiyong, Zhao Zhengjia. The Time Sequential Simulation Based Energy Efficiency Comparison of AC and DC Distribution Power System in Commercial Buildings. Transactions of China Electrotechnical Society, 2020, 35(19): 4194-4206.
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2020, Vol. 35 
