不平衡网压下M-DCPFC脉动功率分配控制策略  

Pulsating power distribution control strategy of M-DCPFC under unbalanced power grid voltage

作　　者：张怡然 荆龙[1] 吴学智[1] 田若宁 孙瑞东 ZHANG Yiran;JING Long;WU Xuezhi;TIAN Ruoning;SUN Ruidong(National Active Distribution Network Technology Research Center,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学国家能源主动配电网技术研发中心,北京100044

出　　处：《电力自动化设备》2025年第2期119-126,共8页Electric Power Automation Equipment

基　　金：北京市自然科学基金⁃丰台轨道交通前沿研究联合基金资助项目(L231006)。

摘　　要：在多端直流配电网中,变换器的交流侧发生网压不平衡会导致其直流侧产生2倍频脉动,从而影响配电网中敏感负荷的供电电能质量。针对该问题,以适用于多端直流配电网的直流潮流控制器(DCPFC)为研究对象,提出一种不平衡网压下的脉动功率分配控制策略。在DCPFC各端口处加入针对2倍频脉动的虚拟阻抗,可以实现2倍频脉动功率在任意线路上的自由分配,以减小对敏感负荷的影响。各端口加入的虚拟阻抗以线路损耗最小为原则进行设计,并利用根轨迹法进一步精确虚拟阻抗的选取范围,使其在分配脉动功率的同时不会影响系统稳定性。通过仿真和实验验证所提控制策略和设计方法的有效性。In a multi-terminal direct current(DC)distribution network,the unbalanced power grid voltage on the alternating current(AC)side of the converter will cause the second harmonic pulsating power on the DC side,which will affect the quality of power supply for the sensitive load in the distribution network.To solve this problem,taking the DC power flow controller(DCPFC)suitable for multi-terminal DC distribution network as the research object,a pulsating power distribution control strategy under the unbalanced power grid voltage is proposed.By adding virtual impedance for second harmonic pulsating power at each port of DCPFC,the second harmonic pulsating power can be freely distributed on any line to reduce the influence on sensitive load.The virtual impedance added to each port is designed according to the principle of mini⁃mum line loss,and the selection range of virtual impedance is further accurate by using root locus method,so that it can distribute the pulsating power without affecting system stability.The effectiveness of the pro⁃posed control strategy and design method is verified by simulation and experiment.

关 键 词：多端口直流潮流控制器 虚拟阻抗 不平衡网压 控制策略 脉动功率 

分 类 号：TM721[电气工程—电力系统及自动化]