基于新能源-负荷相似性的源荷储协调调峰优化调度

Source-load-energy storage coordinated optimal scheduling for peak regulation based on new energy resource-load similarity

合理利用可调节负荷的响应特性来实现源荷储的协调调度,可有效缓解新能源、负荷的不确定性所带来的调峰压力。基于新能源-负荷(NER-L)相似性,建立可调节负荷响应目标。基于相关系数,建立能准确刻画负荷对新能源出力跟踪匹配程度的NER-L相似性指标,并将指标引入所建源荷储协调调峰的双阶段优化调度模型。第一阶段模型以NER-L相关系数最大为目标,确定可调节负荷在各时段的响应功率并获得最优电网负荷;第二阶段模型以弃风弃光量最小、调峰运行成本最低为目标,优化火电机组及储能出力。以IEEE 30节点系统为例,对NER-L相似性、净负荷峰谷差、系统调峰运行经济性及新能源弃电功率进行计算分析,结果验证了所提模型的有效性。

In order to improve the active power regulation ability and inertia support ability of flexible di-rect current(DC)transmission,the technology of high voltage direct current(HVDC)direct-mounted energy storage based on modular cascaded topology is studied,the engineering implementation scheme,control sys-tem architecture and control strategy of HVDC direct-mounted energy storage are explored,and an improved nearest level modulation(NLM)strategy based on the state of charge(SOC)sequencing of sub-module bat-teries is proposed,to solve the overall balance problems of batteries’SOC and sub-module switching fre-quency.The calculation method of key parameters of HVDC direct-mounted energy storage is given.The HVDC direct-mounted energy storage module and control system prototype based on lithium iron phosphate batteries are developed,and an electromagnetic transient simulation model of a flexible DC transmission system with HVDC direct-mounted energy storage and a series converter-based experiment platform are estab-lished.The feasibility of the proposed HVDC direct-mounted energy storage scheme is verified through system simulation and prototype experiment.