碳中和城市建筑能源系统（2）：网络篇
Building energy system of carbon neutrality cities (2): Network
摘要：
本文是碳中和城市建筑能源系统系列文章的第二篇，分别概要介绍了城市能源系统中的电网、热网和燃气网在碳中和背景下的新概念、新技术及新方法。强调未来的能源网以电网为主，三网融通，构成城区的能源互联网。综述了智能电网的灵活性、热泵在智能电网中的重要作用、城区能源总线中的负荷多样性和保持网络水温的技术、基于CO2的区域能源网络，以及城区层面氢燃料的制备、输送、储存等技术问题。
Abstract：
This article is the second in a series of articles on the building energy system of carbon neutrality cities, outlining new concepts, technologies and approaches for the power grid, heating/cooling and gas networks of urban energy systems in the context of carbon neutrality. It is emphasized that the future energy network is smart-grid-based and the three networks are integrated to form an energy internet in urban areas. The article reviews the flexibility of smart grids, the important role of heat pumps in smart grids, the load diversity in the energy bus (EBus) and the technologies to maintain EBus network water temperature, CO2-based district energy networks, and the technical issues such as preparation, delivery, storage of hydrogen fuel at district level.
Keywords:carbon neutrality; building energy system; smart grid; flexibility; heat pump; energy bus (EBus); load diversity; hydrogen