基于线性滤波法的直流输电地电位分布研究

Study on ground potential distribution of DC transmission based on linear filtering method

随着长距离大容量的特高压直流输电工程不断建设投运,其引起的直流偏磁问题也越来越严重,分析直流偏磁问题的重点与难点离不开求解直流接地极的空间电位等电磁兼容参数,这也属于目前研究的热点和难点。首先从空间电位分布的理论推导出发,得到了直流接地极空间电位分布的理论公式,然后提出使用210点线性滤波法求解直流接地极的空间电位分布。最后通过实际算例,分析了此种方法在计算效率、求解精度、运算速度和应用场景上的表现,并验证了该方法的正确性。与商用的接地计算软件CDEGS对比,该方法展现了良好的数值性能和一致性,为直流接地极空间电位分布的计算提供了有效的基础手段。

With the continuous construction and operation of long-distance and large-capacity high voltage direct current(HVDC)transmission projects,the DC bias problems caused is becoming more and more serious.The key and difficulties in analyzing the DC bias problem are inseparable from solving the space potential of the DC grounding electrode,which is also a hot and difficult point in current research.First,based on the theoretical derivation of spatial potential distribution,the theoretical formula of the spatial potential distribution is obtained.Then,a 210-point linear filtering method is proposed to solve the spatial potential distribution of the DC grounding electrode.Finally,the practical examples are used to analyze the performance of the method in terms of computational efficiency,solution accuracy,computational speed and application scenarios to verify the correctness of the method.Compared with the commercial grounding calculation software CDEGS,the method proposed shows good numerical performance and consistency,and can provide an effective basis for the calculation of the spatial potential distribution of DC grounding electrode.