直流接地极入地电流在交流系统中的通路构成及计算方法综述

摘要

The DC bias caused by monopolar ground return operation mode of HVDC system will affect the safe and stable operation of AC power grid.DC current distribution in AC power grid must be correctly and carefully calculated before taking the suppression measurement into consideration.Several DC current distribution calculation methods are classified and analyzed, and the theoretical fundamentals and mathematical models used in each method are introduced in detail.Differences in range of application, computational accuracy, required data, model complexity and whether the method is suitable for DC bias suppression equipment for transformer in AC substation are evaluated and compared thoroughly.Moreover, some suggestions on research directions in the future are given.%直流输电系统单极大地运行引起的变压器直流偏磁现象将影响电网的安全稳定运行,在选择直流偏磁抑制措施时,必须正确地计算交流电网中直流电流的分布.将交流电网直流电流分布计算方法进行了分类,并对各种计算方法的原理和模型进行了详细介绍;而后又从适用场合、计算精度、所需数据、模型复杂程度及是否适合用于分析变压器加装隔直装置的效果等几个角度分别对各种计算方法进行评价,最后对未来的研究方向提出了建议.