不同运行策略下的分布式系统多目标分析

为寻求能源供给系统在经济-安全-环保-节能的协调,依托"互联网+"思维,构建了一套分布式冷电联供系统,主要包括动力子系统、地源热泵子系统、蓄能子系统。建立了在偏离设计工况时不同设备的性能模型,在此基础上,以运行费用、CO_2排放和一次能源消耗为目标函数,分析了电负荷跟踪运行策略、热负荷跟踪运行策略、混合跟踪运行策略和动力设备(PGU)最大效率跟踪运行策略下系统中各设备的运行时间、运行状态及系统总性能的变化。结果表明,与传统电网购电的分供系统相比,分布式系统的经济性、环境性较好,一次能源消耗较低。热负荷跟踪策略的经济性和环境友好性最优,运行费用和CO_2排放分别降低了32.7%和45.3%;最大效率跟踪策略经济性最差,但由于PGU机组连续运行,其一次能源消耗降低最多,为86.7%。不同运行策略结果可为分布式系统的运行提供一定的理论参考。

Multi-objective analysis of distributed energy system under different operation strategies

In order to seek the coordination of energy supply system in economy, security, environmental protection and energy conservation, relying on the "Internet plus", a distributed cooling, heating and power system integrated with power generation unit (PGU), ground source heat pump and energy storage system was constructed. The models about off-design condition of each device were illustrated. On this basis, four operation strategies were put forward: following electric load, following thermal load, following hybrid load and following max efficiency of PGU. Then operation cost, carbon dioxide emission and primary energy were employed as objectives to analyze the operating time, output and performances of the proposed system under off-design condition. The results show that the proposed system has better economy, lower emissions and lower primary energy consumption than the conventional separate system. Under FTL strategy, the operation cost and carbon dioxide emission are the lowest, which are reduced by 32.7% and 45.3%, respectively. Because of the continuous operating, the reduction of primary energy is the most, which is 86.7%. The results can provide some theoretical references for the operation of distributed system.