摘要
直流配电以其具备高效接入分布式电源、储能与直流负荷的优势,近几年建筑电气行业得到广泛关注。作为数量众多、节能潜力巨大的商业楼宇,采用何种配电形式成为影响其能效水平的关键因素,亟需开展楼宇交流与直流配电系统的能效对比分析。现有配电网能效评估研究未能充分考虑商业楼宇负荷的特殊性,评估方法和指标难以适用。针对这一问题,基于商业楼宇交、直流配电系统典型结构,考虑楼宇负荷类型的特殊性和时序性,建立了换流设备的分段线性效率函数及线路动态功率损耗模型,以不同类型分布式电源及负载支路作为评估单元,提出了基于时序仿真的能效评估指标及其方法。最后基于深圳中美中心直流配电示范工程,设计了具备相同边界条件的交流配电系统,进行能效对比分析。算例分析表明,商业楼宇负载类型对于交、直流配电系统能效水平具有重要影响,随着直流负荷比例与分布式电源接入容量的增加,直流配电系统的能效优势逐渐增大。
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.
作者
李海波
赵宇明
刘国伟
蒋世用
赵政嘉
Li Haibo;Zhao Yuming;Liu Guowei;Jiang Shiyong;Zhao Zhengjia(Tsinghua Sichuan Energy Internet Research Institute,Chengdu610213China;Shenzhen Power Supply Bureau Co.Ltd,Shenzhen518020China;Zhuhai Geli Electrical Appliances Co.Ltd,Zhuhai519070China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第19期4194-4206,共13页
Transactions of China Electrotechnical Society
基金
中国南方电网有限责任公司科技项目(090000KK52180116)
电力系统国家重点实验室资助课题(SKLD19KZ04)
四川省科技计划(2019YJ0631)资助。
关键词
直流配电
能效评估
商业楼宇
直流负荷
分布式能源
时序仿真
DC distribution
energy efficiency evaluation
commercial buildings
DC power load
distributed energy
time sequencial simulation
