高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2010年
1期
218-223
,共6页
韩永霞%卢毓欣%陈辉祥%李立浧
韓永霞%盧毓訢%陳輝祥%李立浧
한영하%로육흔%진휘상%리립영
±800kV换流站%雷电侵入波过电压%过电压与绝缘配合%闪络判据%耐雷水平%先导发展法
±800kV換流站%雷電侵入波過電壓%過電壓與絕緣配閤%閃絡判據%耐雷水平%先導髮展法
±800kV환류참%뇌전침입파과전압%과전압여절연배합%섬락판거%내뢰수평%선도발전법
±800 kV converter station%lightning intruding overvoltage%overvoltage and insulation co-ordination%flashover criterion%lightning withstand level%leader propagation method
特高压直流换流站的绝缘配合对系统的安全运行和经济成本至关重要.为此,针对糯扎渡送电广东±800 kV特高压直流输电工程,采用PSCAD/EMTDC软件仿真分析受端换流站雷电侵入波过电压分布及其对设备雷电冲击绝缘水平的影响.建立了换流站各设备的雷电冲击暂态模型和交、直流侧进线段线路的频率相关模型,并选取合适的换流站运行方式进行仿真分析.采用先导发展法作为绝缘子串的闪络判据计算出交、直流侧输电线路进线段内反击和绕击耐雷水平,并由电气几何模型计算最大绕击电流.根据线路耐雷水平计算交、直流侧进线段内反击和绕击时雷电侵入波在换流站内设备上形成的最大过电压,校核设备雷电冲击绝缘水平,提出了改进措施.
特高壓直流換流站的絕緣配閤對繫統的安全運行和經濟成本至關重要.為此,針對糯扎渡送電廣東±800 kV特高壓直流輸電工程,採用PSCAD/EMTDC軟件倣真分析受耑換流站雷電侵入波過電壓分佈及其對設備雷電遲擊絕緣水平的影響.建立瞭換流站各設備的雷電遲擊暫態模型和交、直流側進線段線路的頻率相關模型,併選取閤適的換流站運行方式進行倣真分析.採用先導髮展法作為絕緣子串的閃絡判據計算齣交、直流側輸電線路進線段內反擊和繞擊耐雷水平,併由電氣幾何模型計算最大繞擊電流.根據線路耐雷水平計算交、直流側進線段內反擊和繞擊時雷電侵入波在換流站內設備上形成的最大過電壓,校覈設備雷電遲擊絕緣水平,提齣瞭改進措施.
특고압직류환류참적절연배합대계통적안전운행화경제성본지관중요.위차,침대나찰도송전엄동±800 kV특고압직류수전공정,채용PSCAD/EMTDC연건방진분석수단환류참뇌전침입파과전압분포급기대설비뇌전충격절연수평적영향.건립료환류참각설비적뇌전충격잠태모형화교、직류측진선단선로적빈솔상관모형,병선취합괄적환류참운행방식진행방진분석.채용선도발전법작위절연자천적섬락판거계산출교、직류측수전선로진선단내반격화요격내뢰수평,병유전기궤하모형계산최대요격전류.근거선로내뢰수평계산교、직류측진선단내반격화요격시뇌전침입파재환류참내설비상형성적최대과전압,교핵설비뇌전충격절연수평,제출료개진조시.
The insulation co-ordination of the±800 kV converter station is important for the security and economy of the ultra-high voltage transmission system.By using the PSCAD/EMTDC simulation,we analyzed the lightning intruding overvoltage distribution and the lightning impulse withstand voltage of equipment in the Jiangmen converter station,which was the inverter station of the ±800 kV UHVDC power transmission project from Nuozhadu to Guangdong.The electromagnetic transient model of equipment in converter station and the incoming transmission lines was established,and proper operation mode of the UHVDC system was selected to analyze the most serious situations.The leader propagation method,which was proper as the flashover criterion of the insulators compared to volt-time characteristics in any waveform overvohage,was used to calculate the back flashover and shielding failure current,and the maximum shielding failure current was calculated by electric geometry method(EGM).The maximum lightning intruding overvoltage from AC and DC transmission lines was simulated and the lightning impulse insulation level was checked.It is found that the lightning withstand level of the incoming transmission lines is high when the leader propagation method is used as the flashover criterion of the insulators,and the maximum lightning intruding overvohage is caused by shielding failure.The simulation results show that the AC incoming transmission lines should be improved to limit the maximum shielding failure current.
