基于可变误差多面体算法的储能融合电锅炉提升风电消纳控制技术

Usage of combined energy storage electric boiler to enhance wind power accommodation based on flexible tolerance polyhedron method

储能技术是提高风电-电锅炉-储能系统联合优化运行的关键,能量型和功率型储能系统的混合使用更能满足风电场和电锅炉技术性和经济性的要求。建立了混合储能系统和风电场的数学模型,其中锂电池采用通用受控电压源和定值内阻串联模型,超级电容器采用改进的一阶RC模型,风电模型通过功率解耦法实现对风机有功和无功的解耦控制。以风电场、电锅炉和混合储能系统的技术经济性指标为约束条件,将风电就地消纳能力、电锅炉档位调节次数和储能系统使用寿命列为目标函数,搭建了协同风电和电锅炉多目标优化运行的储能系统控制模型。采用可变误差多面体算法对该模型进行求解,通过某示范工程用算例验证了该方法在优化风电和电锅炉联合运行时的可行性和实用性。在该参数配置下,储能系统能日均提高风电就地消纳率5.36%,降低电锅炉动作次数8次。

Energy storage technology facilitates the joint operation of wind power-electric boiler-energy storage system,and the hybrid energy and power storage systems can satisfy the technical and economic requirements of wind farms and electric boilers. The mathematical model of the hybrid energy storage system and the wind farm is established. In this model,the lithium batteries use universal controlled voltage sources and fixed internal resistance series model. An improved first-order RC model is adopted for supercapacitor.In addition,the wind power model considers the decoupling control of active and reactive power through power decoupling method. Based on this,an energy storage system control model for multi-objective operation of wind power and electric boiler is developed,in which the technical and economic constraints of wind farm,electric boiler and hybrid energy storage system are considered,and the local wind power accommodation,the adjustment times of electric boiler’s tap position,and the service life of energy storage system are included in the objective functions. The flexible tolerance polyhedron approach is utilized to solve this model. The feasibility and practicability of this approach in optimizing the combined operation of wind power and electric boiler are verified by a demonstration project. Under pre-specified setting of parameters,the energy storage system increases the accommodation of wind power by 5.36 % and decreases the control times of electric boiler by 8 times per day.