摘要
基于有限差分法原理,建立了一套可对直流接地极周围温度场参数进行时域分析的数值算法。该方法避免了现有接地极温升计算公式将接地极体视为等温体的缺点,可对接地极体温度分布进行计算。将该方法应用于我国云广和贵广II回直流输电系统共用接地极设计中,对接地极热参数进行分析,针对共用接地极3个备选极址的不同土壤参数特征,分别计算系统持续单极大地回线运行状态下的入地电流对接地极温升的影响。计算结果显示,合理设置接地极参数可将其温升控制在标准限值以内。
On the basis of the finite difference method, we put forward a numerical method that can analyze the thermal parameters of the ground electrode. The method avoids the disadvantages of the formulas which are currently used in analyzing ground electrode temperature rise and consider the electrode as a same temperature. We analyzed the thermal parameters of the common ground electrode of Yun Guang and Gui-Guang II HVDC systems. Due to different soil parameters of three locations for the common ground electrode, the temperature rise was calculated under continuously injected current when the HVDC systems were in monopolar ground return mode. Results show the temperature rise of the electrode does not exceed the limit by choosing the appropriate parameters of the electrode.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第6期1267-1273,共7页
High Voltage Engineering
关键词
特高压直流输电
热参数
接地计算
数值分析
共用接地极
有限差分法
ultra high voltage DC transmission
thermal parameters
grounding analysis
numerical analysis
common grounding electrode
finite difference method
