在合环操作时，为了避免引起很大的稳态电流和冲击电流，使线路过载和越限，要进行合环操作分析和计算。合环操作时可能涉及到主网，在获取主网数据时会遇到多种不同的情况。根据合环操作是否涉及到主网，将合环电流计算分为配网合环计算和主配网拼接合环计算两种情况。当进行主配网拼接合环计算时，根据获取的数据类型分成三种不同情况分别进行了建模与分析，以实现合环电流的计算。采取等值网络模型来分析计算合环网络，详细研究了合环稳态电流计算以及合环冲击(暂态)电流计算的方法，根据合环分析计算的思路和流程编制开发了合环操作软件，在实际应用中验证了所提方法的正确性和有效性。%In order to avoid generating large loop current and impact current which would make circuit overload, closing loop operation must execute under the guide of analysis and calculation. Closing loop operation in distribution network involves transmission network, whose measurement data may be incomplete when they are obtained by the distribution network. Based on whether the closing loop involves transmission network, the paper classifies the loop into two kinds. When dealing with the calculation of closing loop involving transmission network, the paper classifies the combination of measurement data of the transmission network into three different situations, and then provides specific model and analysis for each situation. The paper comes up with the equivalent network to simplify the looped network, introduces the method for calculating the loop closing steady-state current and impulse current, and brings up the thought and process for the analysis and calculation of closing loop operation, which provide the theoretical support for the closed loop operation software. This work is supported by Economic and Technical Research Institute in Shandong Province Electric Power Company (No. SDJYY20130301).
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