基于相分量的配电网短路电流通用计算方法研究

Research on general method for calculating short-circuit fault current of distribution network based on phase component

配电网络具有参数不对称、中性点接地方式多样性等特点,因而其短路电流的计算也应考虑多方面的因素,寻找符合配电网特点的故障分析方法对配电网保护、运行具有重要意义。采用相分量法,同时将故障和中性点与大地构成的端口从网络中剥离出来,对不同的故障类型和中性点接地方式分别用统一的公式来描述,建立了统一的故障分析的模型和分析方法,通过具体示例验证了此方法的有效性。

Distribution network has asymmetric parameters and diversity of neutral-grounding ways, so multi-aspects should be considered into short circuit calculation. At the same time, finding a general fault analysis method is of great significance for protection and running of distribution network. Based on phase component method this paper separates two ports from distribution network, namely the port between fault point and grounding point and the port between neutral point and grounding point. Then uniform formulas are used to describe different fault types and neutral grounding ways, establishing a uniform fault analysis model and method. An example is used to prove that the method is effective.