计及热网损耗的乡镇生物质能综合能源系统两阶段优化运行

为提高能源利用效率,改善乡镇能源结构,推进生物质能在乡镇高效应用,构建了以生物质能为核心的电-热综合能源系统(IES),并提出一种计及热网损耗的IES两阶段优化方法.第一阶段考虑热网损耗,以日总热能供给量最小为目标对多供热设备的出口温度进行优化.而后分析生物质热电联产出力机理,建立其出力模型,并考虑生物质运输、储存、处理全过程,建立了供能成本模型.第二阶段以日收益最大为目标进行IES各设备出力运行优化.通过算例验证了采用两阶段优化可降低问题的复杂度,采用热电联产可提高生物质利用效率,构建生物质能IES可获得较好收益.

Two-stage operation optimization of rural biomass energy integrated energy system considering heat network loss

In order to increase the energy utilization efficiency and improve the rural energy structure, as well as promote the efficient application of biomass energy in rural areas, an electricity-heat IES(Integrated Energy System) with biomass energy as the core is constructed, and a two-stage optimization method of IES is proposed considering heat network loss. In the first stage, the outlet temperature of multi-heating equipment is optimized with the objective of minimizing the daily total heat supply. Then, the output model of biomass cogeneration is established by analyzing its output mechanism. Furthermore, the energy supply cost model is built considering the whole process of biomass transportation, storage and treatment. In the second stage, the output of IES equipment is optimized with the objective of maximizing daily profit. The case results verify that using the two-stage optimization can decrease the complexity of problem, adopting cogeneration can increase the biomass utilization efficiency, and constructing biomass energy IES can obtain better profit.