锁相环对柔性直流输电系统换流站输入导纳的影响分析  

Analysis of the effect of phase-locked loop on input admittance ofconverter station in flexible DC transmission system

作　　者：李培法 唐欣[1] 王文[1] 李田 LI Peifa;TANG Xin;WANG Wen;LI Tian(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;State Grid ZhejiangXiangshan Power Supply Company,Xiangshan 315700,China)

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410114 [2]国网浙江象山县供电有限公司,浙江象山315700

出　　处：《电力科学与技术学报》2020年第4期20-26,共7页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(51577014)。

摘　　要：换流站阻抗模型的准确性直接影响柔性直流输电系统的小干扰稳定性分析,然而模型越精确其阶数也越高,从而增大分析的复杂度。为分析锁相环对换流站阻抗特性的影响,首先建立d-q坐标下考虑和不考虑锁相环2种情况下换流站交流侧导纳矩阵,进而建立静止坐标下换流站的同序和镜像导纳,通过对比考虑和不考虑锁相环的输入导纳,得出锁相环对输入导纳值影响与锁相环传函的截止频率直接相关的结论。最后,在PSCAD软件中建立仿真模型,利用信号注入法获得换流站的同序和镜像导纳验证理论分析的正确性。The accuracy of the impedance model of the converter station directly affects the small interference stability analysis of the flexible DC transmission system.However,the more accurate the model,the higher the order,which increases the complexity of the analysis.To analyze the influence of the phase-locked loop on the impedance characteristics of the converter station,we firstly establish the admittance matrix of the AC side of the converter station under the two conditions of d-q coordinates with and without consideration of the phase-locked loop,and then establish the same order and mirror admittance of the converter station at the static coordinates.By comparing and not considering the input admittance of the phase-locked loop,it is concluded that the influence of the phase-locked loop on the input admittance value is directly related to the cut-off frequency of the phase-locked loop transfer function.Finally,the simulation model is established in PSCAD software.We use the signal injection method to obtain the homologous and mirror admittance of the converter station to verify the correctness of the theoretical analysis.

关 键 词：导纳矩阵 锁相环 小信号分析 阻抗模型 

分 类 号：TM721.1[电气工程—电力系统及自动化]