摘要
将用户侧电、热、气等多种形式能源集成构建微能源系统,能够综合考虑多能流的转换、存储与传输过程中的互补特性,有利于提升系统的整体能源利用效率。然而,系统中不同形式能量的物理属性和传输特性差异较大,现有模型在研究多能流的传输和转换过程时,难以完整考虑热量传输约束及其对能量转换的影响。针对微能源系统中的综合能量管理问题,构建了热力系统中换热器的非线性传热模型,并考虑了热量传输对能量转换效率的影响。同时,结合光伏电池、储能电池、热泵、燃气锅炉、太阳能集热器及相变储热装置建立了微能源系统中能量传输与转换的整体模型,并以系统投资与运行总成本最小为目标构建了优化模型,提出了一种以混合整数线性优化为基础的分层迭代优化策略,通过对系统进行优化设计,研究了热量传输、转换与存储过程间的相互影响。对比发现:未考虑热量传输对热泵和太阳能集热器效率的影响时,太阳能集热器总出力为考虑热量输传输影响的80.2%,储热装置最佳容量仅为考虑热量输传输影响的48.9%。
A micro-energy system integrates electric power,thermal energy,and natural gas,which is effective for energy conservation,by considering the complementary characteristics of multi-energy conversion,storage,and transmission processes.However,the physical properties and transmission characteristics of different energy types in a micro-energy system are distinct.The existing models of micro-energy systems do not consider heat transfer constraints and their influences on energy conversion processes.This work constructs nonlinear heat transfer constraints in a thermal system and considers their effect on energy conversion processes for multi-energy management in micro-energy systems.A photovoltaic device,battery,heat pump,gas boiler,solar collector,and thermal storage device are combined to build the overall optimization model of a micro-energy system with the objective of minimizing the total cost including fixed investment and operating cost.Then,we propose a hierarchical iterative strategy with mixed integer linear optimization,and the influences of heat transfer,energy conversion,and energy storage processes in micro-energy system are examined.If the heat transfer constraints of the thermal system and their effects on the efficiencies of the heat pump and solar collector are not considered,the total heat generation of the solar collector is 80.2%and the optimal capacity of the thermal storage device is only 48.9%compared to when the heat transfer constraints and their effects are considered.
作者
苟星
陈群
孙勇
马欢
贺克伦
李振元
GOU Xing;CHEN Qun;SUN Yong;MA Huan;HE Kelun;LI Zhenyuan(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Engineering Mechanics,Tsinghua University,Haidian District,Beijing 100084,China;State Key Lab of Control and Simulation of Power Systems and Generation Equipments,Department of Electrical Engineering,Tsinghua University,Haidian District,Beijing 100084,China;State Grid Jilin Electric Power Supply Company,Changchun 130000,Jilin Province,China)
出处
《全球能源互联网》
2020年第3期280-290,共11页
Journal of Global Energy Interconnection
基金
国家电网公司科技项目(SGTYHT/18-JS-206)。
关键词
微能源系统
多能输运
能量转换
能量存储
传热约束
micro-energy system
multi-energy transport
energy conversion
energy storage
heat transfer constraints
