分布式供能系统能够提供灵活的能源供给，但目前已投运的分布式供能系统存在着运行效率低、经济效益差的缺点。为了提高分布式供能系统一次能源利用率，以佛山供电局3栋大楼为依托，建成一个高效的天然气冷、电联供示范系统。针对示范系统存在的一次能源利用率低、燃机排烟背压超限制等问题，对系统进行了主机改造和关联系统改造。改造后的试验数据表明，分布式供能系统全年一次能源利用效率取决于：主设备本体的效率、烟气尾部余热利用程度、设备负荷率和年运行时间。

At present, there are several application examples of distributed energy system in China, which can provide flexible supply of energy, but have some shortcomings such as low operation efficiency, poor economic performance and so on. In order to improve the primary energy ratio of distributed energy system, a demonstration project of efficient combined cooling and power system using natural gas has been built, which relied on three buildings located at the Foshan Power Supply Bureau. According to the problems of low primary energy ratio and backpressure of gas turbine exhaust over the limit in demonstration project, the transformations were carried out for the main engine and coherent system. The results show that the annual primary energy ratio of distributed energy system depends on four aspects of factors: the efficiency of main equipment, the waste heat utilization of flue gas, the equipment load and the operation time per year.