计及可再生能源可靠性的虚拟电厂动态聚合方法

Dynamic aggregation method of virtual power plants considering reliability of renewable energy

虚拟电厂静态聚合在追求收益最大化的同时,往往忽视了虚拟电厂在动态聚合时需考虑的重要因素,即可再生能源发电的可靠性,这会导致电网对其调度的积极性不高,弃风弃光现象严重。针对以上问题,提出一种考虑可再生能源可靠性的虚拟电厂动态聚合方法。在可再生能源出力模型的基础上,利用元件的停运概率对出力模型进行修正;利用置信容量将不同机组进行同质化处理,建立考虑置信容量的虚拟电厂可靠性评估模型;以可靠性指标为目标函数,构建虚拟电厂动态聚合模型,使电网对其下达更多的发电计划,并采用改进无网格光线寻优算法对其进行求解。最后,以新疆某地区负荷数据为例,通过仿真验证了所提方法的可行性、高效性与稳定性,从而为虚拟电厂最优化运行提供更为准确的决策支撑。

While pursuing profit maximization,the static aggregation of virtual power plants often ignores the important factor to be considered in the dynamic aggregation of virtual power plants,that is,the reliability of renewable energy power generation,which will lead to the low enthusiasm of power grid for its dispatching and the serious phenomenon of abandoning wind and solar.Aiming at the above problems,a dynamic aggregation method of virtual power plants considering the reliability of renewable energy is proposed.Based on the output model of renewable energy,the outage probability of components is used to correct the output model.Then,the different units are homogenized by confidence capacity,and the reliability evaluation model of virtual power plants is established considering confidence capacity.Furthermore,taking the reliability index as the objective function,the dynamic aggregation model of virtual power plants is constructed,so that the power grid can assign more power generation plans to it,and the improved light ray optimization based on grid free algorithm is used to solve the model.Finally,taking the load data in a region of Xinjiang as an example,the feasibility,high-efficiency and stability of the proposed method are verified by simulation,thus providing more accurate decision support for the optimal operation of virtual power plants.