降低接地极直流偏磁影响的接地极选址优化研究

Optimization Research on HVDC Electrode Site Selection for Reducing the DC Magnetic Bias Effect Upon the Power System

如何降低接地极对周边电力系统的直流偏磁影响,是目前直流接地极建设工程中需要解决的一个非常紧迫的课题。从优化接地极极址的角度出发来降低推荐极址的直流偏磁影响,是解决接地极直流偏磁问题的一条有效途径。结合湘潭±800 kV换流站接地极选址的工程经验,提出选址过程中应增加地质条件评估的步骤,以及应对备选极址周边电力系统网架结构进行综合分析来确定推荐极址等对原有接地极选址方法进行优化的方法,来降低推荐极址的直流偏磁影响,可为以后的接地极工程选址提供借鉴和指导。

How to reduce the impact of the DC magnetic bias upon the power system is a very urgent problem to be solved in the construction of the DC grounding electrode, and optimizing the grounding electrode site is an effective way to solve this problem. Based on the engineering experience of electrode site selection for ±800 kV Xiangtan converter station, the methods of site selection optimization for reducing the influence of DC magnetic bias are put forward, such as evaluating the geological conditions during the site selection process and the comprehensive analysis of the grid structure of the surrounding power system to determine the recommended electrode site. These methods can be used as reference and guidance for the future HVDC project electrode site selection.