摘要:能源、环境问题已经成为制约我国经济可持续发展的一个重要瓶颈。调整能源结构，提高能源利用率，节约能源，改善能源产业的安全性，解决环境污染问题已经成为我国能源战略的重点。而分布式能源系统正是集节能、经济、环保、供能可靠性于一身的新的能源供应方式，在我国有着广泛的发展前景。
分布式能源系统是一种建立在能量梯级利用概念基础上，分布安置在需求侧的能源梯级利用，以及资源综合利用和可再生能源设施。通过在需求现场根据用户对能源的不同需求，实现温度对口供应能源，将输送环节的损耗降至最低，从而实现能源利用效能的最大化。
本文在对分布式能源系统的概念、组成、基本原理进行介绍的基础上，分析比较了以发电设备为核心的不同的分布式能源系统方案，阐明了其各自的工作原理，应用特点，通过分析计算，研究了分布式能源系统的节能条件，并在不同参数变化下，对供热期、制冷期的节能率进行了分析，同时进行了联产与分产系统的火用分析比较，说明了分布式能源系统的节能性。
文章对各种分布式能源配置原则进行了阐述，选择了不同的经济性分析指标，以华北地区的某办公大楼为研究对象，分别采取以热定电和以电定热的原则，并在不同原则下，选择不同的系统配置方案。通过优化，确定了不同燃机台数配置下的最佳容量，电网的购电量，冷热补燃量等参数组合。并将优化的方案与以经验确定负荷的方案进行了对比，从中可以看出燃气内燃机方案作为办公楼分布式能源系统的优越性。
关键词： 分布式能源系统 节能 经济性 优化
Abstract:Nowadays，energy and environment problems have become the boRleneck that limits the sustainable development of the economy of OUr country．Regulating the energy construction，raising the energy utilizing efficiency,save energy,improving the security of energy industry and solving the environment pollution have become the emphases of the energy stratagem of our country．Distributed energy system is just about a new energy supply mode which integrates energy saving，economy,environment protceting，reliable energy supply,and shows broad future in our country．
Distributed energy system is the establishment of energy step utilization， resource integrated using and renewable energy,which is set up based on energy step utilization conception，and allocated separately at the demand side．According to the different demands of the customers，the energy supply is carried out with the match of temperature and the energy loss during the transportation is reduced to the lowest． Thereby the efficiency of the energy using becomes the highest．
In the thesis，based on the introduction to the conception，composing，and the basic principles of the distributed energy system，different distributed energy system projects which take the electricity generation device as the kernel part are analyzed and compared．And these projects’working principle and application features are clarified respectively． And also analyzes and compares the exergy of cogeneration system and separate production system，which Can explain the distributed energy system’S energy saving characteristic．
In the thesis，various collocation principle of distributed energy system is illuminated．Different economy analysis indicators is chosen，and as a research object of certain office block in north China．Through optimization，the best capability of gas—burned machine，purchasing electricity from net，cooling and heating complemented by gas burned is confirmed for various quantity collocation．Meanwhile，comparison between optimized scheme and the scheme which is confirmed by experience is carried through,among this，it can be seen that gas engine scheme has advantage for office block distributed energy system．
Key words：Distributed Energy System, Energy conservation, Eenomy, Optimization
