基于灵活热电比的区域综合能源系统多目标优化调度

Multi-objective optimal dispatch of a regional integrated energy system based on a flexible heat-to-electric ratio

针对热电联供(Combined Heat and Power,CHP)“以热定电”导致的弃风及运行成本较高问题,提出基于CHP灵活热电比的区域综合能源系统多目标优化调度方法。首先,采用补燃装置对CHP补燃,灵活调整各时段补燃率以使CHP热电比跟随风电出力态势,提高系统风电接纳水平与运行效益。然后,考虑补燃燃油的使用增加了系统排污,综合经济性与环保性建立区域综合能源系统多目标优化模型,通过层次分析法对各目标权重进行决策。最后,依托商业优化软件GAMS对建立的混合整数非线性规划问题进行求解。算例研究表明:对CHP热电比进行灵活调节,能够有效促进风电并网消纳、降低系统运行成本。多目标优化使CHP热电比兼顾系统经济性与环保性,较单目标而言更具优势。

The Combined Heat and Power(CHP)operation mode of‘power determined by heat’carries with it the problem of high operational cost and wind curtailment.To help tackle this we propose a multi-objective optimization scheduling method of a regional integrated energy system based on CHP flexible heat-to-electric ratio.First,the CHP is replenished with a fuel supply device,and the rate of replenishment at each period is flexibly adjusted to make the CHP heat-to-electric ratio follow the wind power output,so as to improve the wind power acceptance level and operational efficiency of the system.Then,a multi-objective optimization model of a regional integrated energy system is established based on comprehensive economy and environmental protection taking into account that the use of supplementary fuel increases system emissions,and the weight of each target is determined by an analytic hierarchy process.Finally,the mixed integer nonlinear programming problem is solved by commercial optimization software GAMS.Simulation results show the flexible adjustment of the CHP heat-to-electric ratio can effectively promote the integration of wind power and reduce system operating costs.However,the multi-objective optimization makes the CHP heat-to-electric ratio more advantageous than a single target,and it takes into account system economy and environmental protection.