特高压阀厅金具表面电场计算及起晕校核

为了对阀厅内部金具的起晕情况进行校核,以某±800 kV特高压换流站阀厅为研究对象,采用第三方软件完成实体精细建模,输入到有限元仿真软件ANSYS进行前处理,结合PSCAD软件仿真得到的电位波形,采用瞬时电位加载法,对阀厅3D模型在一周期内各工况下的电场分布情况进行了有限元计算。采用子模型法,实现了局部电场的精确求解。根据电场计算结果,结合相关经验公式以及试验结果,对管形和球形金具的起晕情况进行了校核,在校核过程中,对形状不规则的金具进行了相应的等效模拟。校核结果表明所选阀厅金具在电晕控制方面具有一定裕度,满足阀厅金具设备安全运行要求。研究结果为特高压阀厅金具的设计提供了重要的借鉴。

Calculation of the Surface Electric Field and Checking of the Corona Onset Field Intensity on the Fittings Inside UHVDC Valve Hall

To check the corona onset field intensity on the surface of fittings inside valve hall, by taking a ±800 kV UHV converter station as an example, a 3D whole model is built for the valve hall with the external software and inputted into ANSYS for pre-processing. The electric field distribution in the high voltage valve hall under various working conditions within a cycle is obtained by the electrostatic field instantaneous load method according to the voltage waveforms simulated by PSCAD software. Accurate calculation of the electric field in some concerned areas is realized by using the sub-model method. The corona discharge on the surface of tubular fittings and spherical fittings is also checked throuth comparing the calculation results with the empirical equation and experimental data. In the checking process, the fittings with irregular shapes are processed equivalently. The checking results indicate that the fittings selected for the valve hall have a certain margin in corona control, which can meet the safety requirement. The research result can provide a good reference for designing fittings inside UHVDC valve hall.