含虚拟储能直流微电网的源荷储能量协同优化控制

Cooperative Optimal Control of Source-load-storage Energy in DC Microgrid with Virtual Energy Storage

将具有可控性的源荷以虚拟储能形式融入直流微网内的储能控制系统之中,可为系统高效完成源荷储能量协同优化提供可行方案。首先基于风机和异步电机旋转动能与电容储能间的转换关系,将风机和海水淡化负荷建立为虚拟储能等值模型;由于电动汽车兼备移动负荷和储能特性,利用电价机制制定有序充放电模式,建立电动汽车的虚拟储能模型。其次,联合源荷储建立虚拟储能系统经济优化模型,最大化日内微网运行收益,形成以各时段虚拟电容值和虚拟荷电状态为运行参数的能量协同优化控制策略。最后,通过仿真验证了源荷储能量协同优化控制不但可以缓解直流微网内储能的调节压力,并且可显著提高微网的运行经济性。

Incorporating the controllable source-load into the energy storage control system in the DC microgrid in the form of virtual energy storage can provide a feasible solution for the system to efficiently complete the coordinated opti-mization of source-load-storage energy.This paper firstly establishes a virtual energy storage model for wind turbines and seawater based on the conversion relationship between the rotational kinetic energy of wind turbines and asynchronous motors and capacitive energy storage.Since electric vehicles have both mobile load and energy storage characteristics,the electricity price mechanism is used to formulate an orderly charging and discharging mode,and to establish a virtual en-ergy storage model for electric vehicles.Secondly,an economic optimization model of the virtual energy storage system is established in conjunction with the source,load,and storage system to maximize the operating income of the microgrid during the day,so that an energy collaborative optimization control strategy is formed with the virtual capacitance value and the virtual state of charge in each period as the operating parameters.Finally,it is verified by simulation that the co-ordinated optimal control of source-load-storage energy can not only relieve the regulation pressure of energy storage in the DC microgrid,but also significantly improve the operating economy of the microgrid.