±800kV直流换流阀模块内部电场仿真对比分析  

Electric Field Simulation Comparative Analysis of the Internal Valve Module of ±800kV HVDC Converter Valve

作　　者：张静岚[1] 卢铁兵[1] 齐磊[1] 纪锋 崔翔[1] 刘杰 

机构地区：[1]高电压与电磁兼容北京市重点实验室(华北电力大学),北京市昌平区102206 [2]国网智能电网研究院,北京市昌平区102209

出　　处：《智能电网》2015年第6期542-551,共10页Smart Grid

基　　金：国家自然科学基金项目(51277065);国家863高技术基金项目(2012AA052701)~~

摘　　要：全球能源互联网以其可再生、分布式、互联性、开放性和智能化等优势日益受到业界普遍关注,高压直流输电系统作为能源互联网中的基本组成元素,换流阀内部高电位区导体表面电场计算是实现小安全裕度下换流阀绝缘优化的关键。在实际运行的直流输电工程中,±800 k V直流换流阀塔内部电路触发板上的直流均压电阻温度过高,因此需对阀模块内部进行电路改造。为重新测量电路改造后阀塔内部绝缘的可靠性,采用Solid Works建模软件建立阀塔3维模型;并结合逐次子模型技术,利用ANSYS有限元软件对阀模块内部元件的表面电场强度进行仿真计算;对比分析改造前后的阀模块内部电场分布情况。结果表明,阀模块内部整体电场分布合理,电场分布情况满足工程设计要求,最后提出针对电场薄弱环节的优化建议。The concept of global energy internet has gained widespread concern by the industry for its advantages of renewability, distribution, interconnection, openness and intelligence. HVDC systems are an essential element of global energy internet. The surface electric field calculation of conductors in high-potential area inside the HVDC converter valve is the key to achieve optimal insulation under small margin of safety. In the practical operation of HVDC power transmission project, the temperature of DC equalizing resistance on the circuit board inside the ±800 kV HVDC valve tower is so high, therefore the circuit inside the valve module needs to be altered. In order to obtain the internal insulation reliability of valve tower after circuit alteration, a three-dimensional model of the converter valve tower is established by SolidWorks software and combined with successive sub-model technology, the surface electric field distribution of capacitors and radiators inside the valve module is calculated by using ANSYS finite element software. The comparative analysis of electric field distribution of valve module before and after alteration is made. The simulation results show that the overall electric field distribution of valve module is relatively reasonable, and the electric field distribution of a valve layer meets the design requirements. In the end, the optimization suggestion is proposed for the electric field weakness.

关 键 词：高压直流换流阀 单阀直流耐压试验 电场计算 逐次子模型 绝缘优化设计 

分 类 号：TM721.1[电气工程—电力系统及自动化]