摘要
多端口电力电子变压器(Power Electronic Transformer,PET)可以在交直流混合配电网建立功率柔性调节的通路,实现多个交直流混合配电区域间电能互联互济。提出一种基于多端口PET的交直流混合配电网日前经济运行策略。首先基于交直流混合配电网典型拓扑,分析含PET交直流配网的灵活调控能力;然后根据PET运行过程中的物理约束,分析多端口PET各端口功率流动关系,建立混合配网中PET的能量流动模型;最后以交直流混合配网运行成本最低为目标函数,以系统功率平衡、潮流越限和设备运行上下限的约束为约束条件,建立交直流混合配电网日前经济运行模型,提出了基于CPLEX求解器的模型求解方法。以我国某地区交直流混合配电网示范工程为例,建立了该示范工程的混合配网日前经济运行模型,并进行了求解。算例结果表明,所提运行策略可以有效地降低系统运行成本,提高可再生能源消纳水平。
By means of multi-terminal power electronic transformer(abbr.PET)the flexible power regulation path in AC/DC hybrid distribution network can be constructed for interaction and mutual aid of electric energy among multi-AC/DC hybrid distribution regions.A multi-terminal PET based dayahead economic operation strategy for AC/DC hybrid power distribution network was proposed.Firstly,based on typical topology of AC/DC hybrid power distribution network,the flexible regulation and control capability of AC/DC hybrid power distribution network containing PET was analyzed.Secondly,according to physical constraint during the operational process of PET,the relation of power flowing of each terminal in multi-terminal PET was analyzed and an energy flowing model of the PET in AC/DC hybrid distribution network was built.Finally,taking the lowest operating cost of AC/DC hybrid distribution network as objective function and taking the system power balance,the power flow off-limit and the upper and lower limit constraints of equipment operation as the constraint conditions,a day-ahead economical operating model for AC/DC hybrid power distribution network was established and based on the CPLEX solver a method to solve the established model was put forward.Taking a demonstration project of an AC/DC hybrid power distribution network in a certain region in China for calculation example,a day-ahead economic operating model of this demonstration project was constructed and solved.The results of the calculation example show that using the proposed PET based economic operating strategy for AC/DC hybrid power distribution network the operating cost of the distribution system can be effectively reduced,and the accommodation level of renewable energy resource can be raised.
作者
易文飞
王鑫
YI Wenfei;WANG Xin(Electric Power research Institute of State Grid Jiangsu Electric Power Co.LTD.Nanjing 210096,Jiangsu Province,China;State Grid Jiangsu Economic Research Institute,Nanjing 210000,Jiangsu Province,China)
出处
《现代电力》
北大核心
2021年第3期339-345,共7页
Modern Electric Power
关键词
电力电子变压器
交直流混合配电网
功率调节
经济运行策略
系统损耗
power electronic transformer
AC/DC hybrid distribution network
power regulation
economic operation strategy
system loss
