含直流潮流控制器的真双极多端柔性直流电网潮流计算研究  

Research on Power Flow Calculation of True Bipolar Multi-terminal Flexible DC Power Grid with DC Power Flow Controller

作　　者：管恩齐 何晋[1] 骆通 GUAN Enqi;HE Jin;LUO Tong(School of Electrical Information Engineering,Yunnan Minzu University,Kunming 650000,China)

机构地区：[1]云南民族大学电气信息工程学院,昆明650000

出　　处：《电力电容器与无功补偿》2023年第2期68-76,共9页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金项目(No.52061042);云南省教育厅科学研究基金项目(2021Y654)。

摘　　要：为优化直流电网的潮流分布,需增加潮流控制器的辅助来增加线路的自由度。基于模块化多电平换流器的真双极多端直流输电系统具有低损耗、控制和运行方式灵活等优点,已经成为未来直流输电系统的主流方式。不同于伪双极输电系统,该系统在接入潮流控制器后,系统的潮流变化更加复杂,用于计算伪双极潮流分布的方法将不再适用该系统。针对以上问题,以电压型直流潮流控制器为例,在考虑站级控制的情况下推导了含潮流控制器的真正双极性直流电网潮流计算方法,通过引入等效电阻模型,避免了大量计算节点的引入。最后,将算法结果与PSCAD/EMTDC平台中搭建的张北柔性直流输电工程的仿真算例结果进行对比,验证了该算法的可行性与准确性,同时也验证了潮流控制器在真双极系统中的潮流控制能力。For optimizing the power flow distribution of DC power grid,the assistance of a power flow controller is needed to increase the degree of freedom of the line.The true bipolar multi-terminal DC transmission system based on modular multilevel converters has such advantages as low loss and flexible control as well as operation modes,and has become the mainstream mode of the future DC transmission system.Different from the pseudo-bipolar power system,when the system is connected to the power flow controller,the variation of the power flow of the system is more complicated,and the method used to calculate the pseudo-bipolar power flow distribution will not be applicable to the system any longer.In view of above problem,the voltage-type DC power flow controller is taken as an example,a true bipolar DC grid power flow calculation method including the power flow controller is derived under the condition of considering the station-level control,and the introduction of a large number of calculation nodes is avoided by introducing the equivalent resistance model.Finally,the results of the algorithm are compared with the simulation results of Zhangbei flexible MTDC project built on the PSCAD/EMTDC platform to verify feasibility and accuracy of the algorithm and,at the same time,also verify the power flow control ability of the power flow controller in the true bipolar system.

关 键 词：直流电网 真双极系统 潮流计算 等效电阻法 直流潮流控制器 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM744