柔性直流输电系统的桥臂功率解析  

Bridge Arm Power Analysis of Flexible HVDC Transmission System

作　　者：雷顺广 束洪春[2] 李志民[1] 田鑫萃[2] 王广雪 LEI Shunguang;SHU Hongchun;LI Zhimin;TIAN Xincui;WANG Guangxue(School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150001,Heilongjiang Province,China;Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650051,Yunnan Province,China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨150001 [2]昆明理工大学电力工程学院,云南省昆明市650051

出　　处：《电网技术》2023年第4期1490-1499,共10页Power System Technology

摘　　要：该文从能量传递角度对柔性直流输电系统故障进行解析,提出了基于换流阀桥臂功率的柔性直流输电系统故障解析方法与新思路,为柔性直流输电系统交流故障、直流线路故障分析及瞬时能量平衡控制提供了解析基础和实用工具。首先,建立了交流系统故障等效电路,利用对称分量法推导在交流单相故障、双相短路故障以及三相短路故障下桥臂功率解析表达式,分析了交流故障下桥臂功率的变化特征;继而,从能量传递角度出发,建立了直流故障等效电路,推导了直流线路故障下桥臂功率解析表达式,分析了直流故障下桥臂功率的变化特征;最后,在PSCAD/EMTDC仿真平台搭建了柔性直流输电系统,把解析结果与仿真结果进行了对比,验证了该文所提解析方法的准确性。This paper analyzes the faults of the flexible HVDC transmission system from the energy transferring perspective,upon which a new fault analysis method based on the arm bridge power of the flexible HVDC transmission system is proposed,which provides the basis for the analysis and solution of AC faults,DC line faults,and transient energy balance control in flexible DC transmission systems.Firstly,an equivalent circuit for AC system faults is established,and the analytical expressions for arm bridge power under AC single-phase faults,phase-phase short-circuit faults,and three-phase short-circuit faults are derived using the symmetric component method.Meanwhile,the variation characteristics of bridge arm power under AC faults are analyzed.Then,from the energy transferring point of view,a DC fault equivalent circuit is established,based on which the analytical expressions for the arm bridge power under DC line faults are derived and the changing characteristics of the arm bridge power under DC faults are analyzed.Finally,a flexible DC transmission system is established on the PSCAD/EMTDC simulation platform,and the analytical results are compared with simulation results to verify the accuracy and reliability of the proposed analytical method.

关 键 词：柔性直流输电 故障电路等效 故障解析 桥臂功率解析 桥臂功率特征 

分 类 号：TM721[电气工程—电力系统及自动化]