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基于PSCAD/EMTDC的电力系统中性点接地方式研究

摘要：电力系统中性点的运行方式涉及系统的电压等级、电力网络结构、绝缘水平、通信干扰、接地保护方式和保护整定等许多方面，是一个综合性的复杂问题。目前，对电力系统的中性点接地方式的选择，多基于以往运行经验。本文利用PSCAD/EMTDC软件建立了电力系统的中性点运行方式的仿真模型，模拟了各种运行方式下，线路上发生单相接地故障时，电气参数的变化情况，并综合考虑系统可靠性、绝缘水平和继电保护的要求，确定了各种运行方式的适用范围。文中所建模型及结论对于分析高阶、非线性的电力系统暂态过程具有借鉴意义。 叙词：PSCAD/EMTDC 电力系统 中性点接地消弧线圈 Abstract：Neutral point grounding which is related to voltage level, network structure, insulation, communication and relay protection is very important problem to power system. Nowadays, the choice of neutral point grounding mode mainly relies on operation experiences or theoretical analysis which could not give a direct view of the dynamics of electric power system during disturbances. Therefore, this paper has established the simulation model of electric power system neutral point grounding with PSCAD/EMTDC to show the dynamics of neutral point grounding when disturbed by single-phase grounding in transmission lines, and the application of each neutral point grounding mode has been analyzed according to simulation results. The dynamic model of neutral point grounding in this paper is meaningful to the analysis of high-order, non-linear transients of power system as well. Keyword：PSCAD/EMTDC, Power system, Neutral point grounding, arc suppression

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