我国气候复杂多变，目前尚无有效的数值模拟方法来仿真强风骤雨条件下特高压直流(UHVDC)电气设备的电晕特性。本项目从宏观上计算风、雨影响下导体周围空间电场畸变情况，研究导体电晕机理；从微观上分析雨滴的荷电特性及各粒子动力学特性，研究各粒子在强风骤雨天气下迁移率的变化规律。建立电离层内多物理场仿真方法，考虑碰撞反应、二次电离及光电离过程以改进Kaptzov假设条件，探索电离层边界的宏观等效条件。在电离层外的迁移区采用瞬态上流元法仿真各粒子的运动特性及空间合成电场，提出新的上流元判断算法解决高风速时的数值收敛性问题。设计模拟强风骤雨天气环境的典型电极电晕试验，研究间隙距离、加载电压、极性、风速和降雨强度对电晕电流的影响规律，与数值模拟结果对比，提高模型参数的准确度。提出强风骤雨天气条件下直流导线和典型UHVDC电气设备的电晕特性及合成电场数值仿真模型，为UHVDC输电工程的安全运行提供建议。

The climate is complex and variable in China. There is no effective numerical simulation method to simulate the corona characteristics of ultra high voltage direct current (UHVDC) electrical equipment under strong wind and rainstorm conditions. In the project, the electric field distortion around the conductor under the influence of wind and rain will be calculated macroscopically, and the corona mechanism of the conductor will be studied. The charging properties of raindrop and the dynamic characteristics of each particle will be analyzed microscopically, and the change law of mobility of each particle under strong wind and rainstorm will be studied. A simulation method of multi-physics fields in the ionosphere will be established. The collision reaction, secondary ionization and photoionization process will be considered to improve the Kaptzov hypothesis and explore the macroscopic equivalent conditions of the ionospheric boundary. In the migration region outside the ionosphere, the transient upstream finite element method will be used to simulate the motion characteristics of particles and the space total electric field. Besides, a new upstream finite element judgment algorithm will be proposed to solve the numerical convergence problem at high wind speed. A typical electrode corona test will be designed to simulate the strong wind and rainstorm weather environment. The effect law of gap distance, loading voltage, polarity, wind speed and rainfall intensity on corona current will be studied. The accuracy of model parameters will be improved by comparing with the numerical simulation results. The corona characteristics and total electric field numerical simulation model of direct current conductors and typical UHVDC electrical equipment under strong wind and rainstorm conditions will be presented, which will provide suggestions for the safe operation of UHVDC transmission engineering.