南沙配电网合环运行短路电流计算与限制研究
Calculation and Restriction of Short-circuit Current in the Loop-closed Operation of Nansha Distribution Network
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摘要:
系统研究了配电网合环运行的短路电流计算方法与限制措施，并在南沙配电网进行实际应用。首先，提出了合环运行短路电流的计算模型，并综合考虑不同短路点以及短路形式对短路电流的影响，给出了一种较为全面的配电网合环运行短路电流计算方法。该方法能准确计算合环线路的最大短路电流，并明确该短路电流出现的位置和短路方式。再次，对比分析了各种短路电流限制措施在配电网合环运行中的适用性，确定了在配电网合环运行中进行短路电流限制的原则和实施步骤，给出了加装串联电抗器参数的详细计算方法。最后，将所提方法应用于南沙配电网合环线路的短路电流计算与限制中，结果表明了所提方法的可行性与有效性。 Abstract:The calculation and restriction of short-circuit current in the loop-closed operation of distribution metwork is studied in this paper, and then is applied in Nansha distribution network. First, the calculation model of short-circuit curren in the loop-closed operation is presented. Then, taking into account the impact of short-circuit point and short-circuit form, a comprehensive calculating method of short-circuit current is given, which can provide the biggest short-circuit current. Its short-circuit point and form can be maken clear as well. Secondly, the applicability of restriction measures of short-circuit current for the loop-closed operation of distribution network is analyzed one by one. Afterwards, the principle and implementation details are determined. The calculation of reactor parameters is also presented. Finally, the proposed method is applied in the Nansha distribution metwork, the results show its feasibility and validity.
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