考虑储能效益的微网经济调度

Economic Dispatch for Micro-grid Considering Energy Storage Benefit

针对风电并网对微网系统调度的影响,结合储能系统快速释放和吸收电能的特点,提出了以储能供应商为主体的微网经济调度双层优化模型。模型构建以储能供应商套利收益最大为上层目标,以微网运行效益最大为下层目标;在模型求解上,将下层优化模型运用KKT条件转化后得到新的混合整数线性规划模型。以某一微网系统为数值算例,计算并分析了影响上层优化最优值的相关因素及微网中的不确定因素对调度结果的影响,为下一步实践提供了重要依据。

Aiming at the influence of grid-connected wind power on micro-grid dispatching,combined with the characteristics of quick release and power absorption of energy storage system,the paper proposes a bi-level optimization model of micro-grid economic dispatch taking energy storage supplier as the main body.During the model building,maximum energy storage supplier arbitrage benefits is taken as the upper-level objective,and maximum micro-grid operating benefits is used as lower-level objective.The lower-level optimization model is transformed into a new mixed integer linear programming model to solve the model by using Karush-Kuhu-Tucker(KKT) method.Finally,the paper conducts the calculation and analysis of related factors on upper-level optimization optimum value and the uncertain factors in the micro-grid on the scheduling results with a numerical example of a micro—grid.