交流电网对管道持续干扰分析建模边界的确定方法

Determination of Modeling Boundary for Continuous Interference Analysis of Power Grid to Pipelines

为分析大区域电网对埋地油气管道的持续干扰,本研究在分析持续干扰电压幅值随线路和管道间距变化规律的基础上,提出利用阈值确定大区域电网建模边界,以构建电网对管道持续干扰分析模型的方法,并建立了计算截断误差的概率模型。结果表明:由距离管道较远线路产生的小幅值干扰电压分量的向量和近似为零,且这些干扰电压分量向量和的模值近似服从瑞利分布;在分析线路平均间距大于200 m的220 kV电网对管道的持续干扰时,仅考虑管道两侧4.20 km内导线按ZB型杆塔排列的线路,4.10 km内导线按ZM型杆塔排列的线路,10.65 km内导线按SZ型杆塔排列的线路,11.93 km内导线按SSZ型杆塔排列的线路,11.84 km内导线按SSSZ型杆塔排列的线路,即可使截断误差有95%的概率小于2.23 V。

In order to analyze the continuous interference of large area power grid to buried oil and gas pipe-lines,based on the analysis of continuous disturbance voltage amplitude change rule with lines and pipe spac-ing,this paper proposes a method to determine the modeling boundary of large area power grid by using threshold value,to construct the analysis model of the power grid to pipeline continuous interference,and es-tablishes a probability model to calculate the truncation errors.The results show that:the vector sum of small amplitude interference voltage components generated by the lines far away from the pipeline is approximately zero,and the module value of the vector sum of these interference voltage components approximately obeys Rayleigh distribution;when analyzing the continuous interference of 220 kV power grid with the average dis-tance between lines greater than 200 m to the pipeline,only the lines with conductors arranged in ZB type tow-er within 4.20 km,the lines with conductors arranged in ZM type tower within 4.10 km,the lines with con-ductors arranged in SZ type tower within 10.65 km,the lines with conductors arranged in SSZ type tower with-in 11.93 km,the lines with conductors arranged in SSSZ type tower within 11.84 km on both sides of the pipe-line are considered,and it can make the truncation errors have a 95%chance of less than 2.23 V.