摘要
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。
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 overvohage 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 overvohage 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 overvoltage 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.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第1期218-223,共6页
High Voltage Engineering
关键词
±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
±800 kV converter station
lightning intruding overvohage
overvohage and insulation co-ordination
flashover criterion
lightning withstand level
leader propagation method
作者简介
韩永霞 1982-,女,博士广东省电力设计研究院在站博士后,2009年毕业于华中科技大学电气学院并获得高电压与绝缘技术专业博士学位。研究生期间主要从事输电线路的过电压和防雷、脉冲功率技术等方面的研究,博士后课题为特高压直流换流站的绝缘配合。曾经主要参与的重大项目有国家自然科学基金“用辉光放电等离子体提高膜电容器储能密度的研究”,3项国家863计划项目,及“南京三江口大跨越工程跨越塔防雷研究”电话:(020)32116381 E-mail:hanyongxia@gedi.com.cn
卢毓欣 1984-,女,硕士2007年毕业于华中科技大学电气学院,并获得高电压与绝缘技术专业硕士学位。研究方向为高压直流输电系统过电压与绝缘配合,参与的重大项目有±800kV穗东换流站、±800kV江门换流站工程设计,以及:±800kV换流站雷电过电压保护专题研究E-mail:luyuxin@gedi.com.cn
陈辉祥 1963-,男,博士,教授级高工广东省电力设计研究院副总工程师。于1988年毕业于清华大学电机工程系。主要从事交直流输电技术的研究,主持的重大项目有±800kV云广特高压直流输电工程设计及相关关键技术研究等E—mail:chenhuixiang@gedi.com.cn
李立涅 1941-,男,教授,中国工程院院士中国南方电网公司专家委员会秘书长。1967年毕业于清华大学电机工程系,电网工程和直流输电专家。和组织建设了我国第一条500kV交流和±500kV直流输电工程、世界上第一条±800kV云广直流输电工程的技术研究、关键项目攻关和工程建设E—mail:lilc@csg.cn