考虑能源重复转换的综合能源系统经济运行

Economic Operation of an Integrated Energy System Considering Repeated Conversion of Energy Sources Within an Energy Hub

在综合能源系统中引入电转气(power to gas,P2G)设备加强了电力和天然气网络间的耦合,减少了弃风弃光现象,但也使可再生能源在进行优化调度时发生能源重复转换,降低用能效率,产生能源损耗。在此背景下,提出了一种减少能源重复转换的双层优化调度模型,引入KKT条件将双层模型转化为单层模型,优化得到了协调各转换设备的调度运行计划及系统最小运行成本。在算例中采用4种不同的典型场景对系统进行验证,结果表明:所提优化调度模型能够在提高可再生能源消纳的情况下,降低系统运行成本,提高用能效率,与未考虑能源重复转换的传统调度模型相比经济性有显著提高。

The introduction of P2G (power to gas)equipment into integrated energy systems has strengthened the coupling between electricity and natural gas networks,reduced the abandonment of wind power,but also reduced to a certain extent the optimization of renewable energy sources in energy hubs.Energy conversion occurs during dispatch,which reduces the energy efficiency and generates energy losses.In this context,a two-layer optimization scheduling model is proposed to reduce the repetitive conversion of energy sources.The KKT condition is used to convert the two-layer model into a single-layer model,and the scheduling operation schedule of the conversion equipment and the minimum operating cost of the system are optimized.Finally,four different typical scenarios are used to verify the system in the example.The results show that the proposed optimized scheduling model can reduce the operating cost of the system and improve the energy efficiency.The scheduling model that considers repeated energy conversions has significantly improved economics.