特高压混合无功补偿变电站内特快速暂态波幅频特性  

Amplitude and Frequency Characteristics of Very Fast Transient in UHV Substation With Hybrid Reactive Power Compensation

作　　者：韩明明[1] 李清泉[1] 刘洪顺[1] 王冠[1] 赵黎[1] 李斌[1] 

机构地区：[1]山东省特高压输变电技术与装备重点实验室(山东大学),山东省济南市250061

出　　处：《电网技术》2015年第12期3353-3359,共7页Power System Technology

基　　金：国家自然科学基金项目(51507095)~~

摘　　要：混合无功补偿安装在特高压变电站内时,隔离开关(disconnecting switch,DS)闭合时在不同位置产生的特快速暂态波(very fast transients,VFT)受多方面因素影响。在建立混合无功补偿等效模型、传输线理论及变电站简化模型的基础上,应用数学解析方法推导VFT计算表达式,分析线路长度及站内设备等效电容对VFT频率的影响,计算站内不同位置DS闭合时母线长度、分级可控高抗(stepped controllable shunt reactor,SCSR)入口电容变化和架空线路长度对站内各处特快速暂态过电压(very fast transient overvoltage,VFTO)幅频特性的影响。结果表明,混合无功补偿的安装将增大VFTO的振荡频率;气体绝缘设备(gas insulated switchgear,GIS)中DS闭合时分级可控高抗端口的VFTO主要受母线长度影响,其频率随母线的增长而减小,其峰值、主频和主频对应幅值随分级可控高抗入口电容增大而降低;串补内DS闭合时分级可控高抗端口的VFTO频率随其入口电容增大而降低,串补与分级可控高抗之间架空线路长度增加会抑制分级可控高抗端口的VFTO。With hybrid reactive power compensation installed in UHV substation, very fast transients（VFTs） are generated due to disconnector closing at different position and influenced by many factors. On basis of hybrid reactive power compensation device equivalent model, transmission line theory and simplified substation model, mathematic analytical method is applied to calculate VFT＇s oscillation expression. With theoretical method this paper analyzes influence of line length and device equivalent capacitance on VFT overvoltage（VFTO） frequency and calculates amplitude-frequency characteristic of VFTO due to disconnector closing at different positions of UHV substation affected by busbar length change, stepped controllable shunt reactor（SCSR） entrance capacitance and overhead line length. Results show that dominant frequency of VFTO generated at SCSR port by closing disconnector in GIS is mainly affected by bus-bar length. Its dominant frequency can be reduced when increasing busbar length, and VFTO can be reduced when increasing entrance capacitance of SCSR. Dominant frequency of VFTO generated at SCSR port by closing disconnector in series compensation can be reduced when increasing entrance capacitance of SCSR; VFTO is reduced when increasing overhead line length between series compensation and SCSR.

关 键 词：混合无功补偿 VFTO 传输线理论 幅频特性 分级可控高抗入口电容 

分 类 号：TM86[电气工程—高电压与绝缘技术]