高压直流换流阀用绝缘子表面电场计算及均压环设计

发布时间：2018-03-26 00:14

本文选题：直流换流阀　切入点：绝缘子　出处：《电网技术》2014年02期

【摘要】：换流阀是高压直流换流站的核心装备,高电位区导体及绝缘子表面电场计算是实现小安全裕度下换流阀绝缘优化设计的关键。将换流阀内典型结构,如绝缘子、晶闸管等,简化为二维模型,在二维场中直接进行电场计算,可实现电场的准确快速计算。通过对二维、三维算例进行电场计算,证实了边界电场约束方程计算电场的精度在二维场中高于ANSYS的计算精度。因此在二维轴对称场中应用该方法对某换流阀绝缘子进行了表面电场计算及均压环设计,使绝缘子金具表面电场由7.55 kV/mm降为2.87 kV/mm,绝缘子表面电场由1.93 kV/mm降为0.9 kV/mm。最后,应用ANSYS软件在三维复杂模型中对均压环尺寸进行校验计算。文中工作为直流换流阀用绝缘子表面电场计算及均压环优化设计提供了一种可靠、实用的计算方法。
[Abstract]:Commutation valve is the core equipment of HVDC converter station. The calculation of electric field on conductor and insulator surface in high potential area is the key to optimize the insulation design of converter valve with small safety margin. The typical structure of converter valve, such as insulator, thyristor, etc. The electric field can be calculated accurately and quickly in the two-dimensional field, and the electric field can be calculated by the two-dimensional and three-dimensional examples. It is proved that the calculation accuracy of the boundary electric field constraint equation is higher than that of ANSYS in two-dimensional field, so the surface electric field calculation and pressure sharing ring design of a converter valve insulator are carried out by using this method in two-dimensional axisymmetric field. The surface electric field of insulator is reduced from 7.55 kV/mm to 2.87 KV / mm. and the surface electric field of insulator is reduced from 1.93 kV/mm to 0.9 KV / mmm. finally, This paper presents a reliable and practical calculation method for the calculation of electric field on the surface of insulator and optimal design of voltage sharing ring for DC converter valve by using ANSYS software to calibrate and calculate the size of the equalizing ring in a three dimensional complex model.
【作者单位】：高电压与电磁兼容北京市重点实验室(华北电力大学);新能源电力系统国家重点实验室(华北电力大学);国网智能电网研究院;
【基金】：国家自然科学基金项目(51277065) 国家863高技术基金项目(2012AA052701)~~
【分类号】：TM216

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