提升风电消纳的热电混合储能系统优化控制策略

Optimal Control Strategy of Thermoelectric Hybrid Energy Storage System for Improving Wind Power Consumption

针对我国“三北”地区供暖期热电联产机组“热电耦合”导致风电场风电出力高的时间段弃风量过高问题,提出了计及热电混合储能系统提升风电消纳电量的优化控制策略.首先建立储热式电锅炉与电池储能配合消纳弃风的混合系统数学模型;其次构建了计及风电出力、储热式电锅炉、电池储能的各种约束以及储热式电锅炉、电池储能的单位风电转化效益的含储热电混合储能系统的模型,然后以整个系统弃风消纳量最大以及系统经济性最优为目标函数,借鉴遗传算法中的选择思想,以电锅炉储热罐的SOC状态为变量,设计了电锅炉的运行挡位优化选择策略,每个挡位被选中概率与其适应度函数值成正比,最后在MATLAB中用YALMIP调用CPLEX对模型进行优化求解.基于某省级电网数据,对不同运行方式下的弃风消纳情况进行对比分析,验证了所提优化策略可以有效提高系统消纳弃风能力并且可以等效降低投资成本.

Aiming at the problem of excessive abandoned air volume in the period of high wind power output caused by the“thermoelectric coupling”of cogeneration units in the heating period of"Three North"area of China,an optimal control strategy considering the thermoelectric hybrid energy storage system is proposed to improve the wind power consumption.Firstly,the mathematical model of the hybrid system with the combination of the thermal storage electric boiler and the battery energy storage is established;secondly,the model of the hybrid energy storage system with the unit wind power conversion benefit of the thermal storage electric boiler and the battery energy storage is established,taking into account the wind power output,the constraints of the thermal storage electric boiler and the battery energy storage,and then the maximum wind energy consumption and the system economy of the whole system Taking the SOC state of the heat storage tank of the electric boiler as the variable,the optimal selection strategy of the operating gear of the electric boiler is designed.The probability of each gear being selected is proportional to its fitness function value.Finally,the model is optimized by calling CPLEX with yalmip in MATLAB.Based on the data of a provincial power grid,the comparative analysis of wind curtailment under different operation modes is carried out,which verifies that the proposed optimization strategy can effectively improve the wind curtailment capacity of the system and reduce the investment cost.