直流纳网互联运行的在线能量管理方法

摘要

针对直流纳网互联形成的纳网群,提出一种在线能量管理方法,在纳网内部层面与纳网交互层面实现能量流控制.基于李雅普诺夫优化理论,构建虚拟储能队列,提出以提高光伏替代率与保证队列稳定性为目标的数学模型,将能量管理问题解耦为每个时刻的线性规划问题,不依赖系统中的未来信息,只需获取当下时刻的信息即可对纳网之间的交换电量做出实时决策.通过实际采集的用户负荷及光伏数据构造了仿真算例,结果验证了所提能量管理方法在满足纳网用户负荷需求的同时,有效地提高了可再生能源在直流纳网群中的消纳.同时,测试结果表明该算法决策时间较短,能满足系统的实时性要求.%An online energy management method is proposed for DC nanogrid cluster to control the energy flow within each nanogrid and among the nanogrids.Based on the Lyapunov optimization theory, the concept of virtual energy storage queues is developed.A mathematical model is proposed to improve the solar replacement ratio and guarantee queue stability, which decouples the complex energy management problem into linear programming problems of each time slot.Only the current information is needed to make the real-time decision of the exchange electricity among nanogrids.Simulation is conducted based on the actual household load and photovoltaic generation data collected.The results have verified that the proposed method can effectively improve the accommodation of renewable energy in the DC nanogrid cluster while satisfying the load demand.Meanwhile, the test result shows that it does not take the method long to make decisions, which is the real-time requirement of the system.