Slack line flow sessions can appear in a long slope pipeline.

大落差管道在运动中，其下坡段可能出现不满流管段。

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Firstly, the problem of reactive power constrains of generator at slack bus is studied, and a load margin algorithm of continuation power flow of reactive power constrain at slack bus is proposed.

首先，针对传统连续潮流算法在计算负荷裕度时遇到的平衡节点发电机无功约束问题进行了研究，提出了平衡节点无功约束的连续潮流负荷裕度算法。

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So, the problem of reactive power constrains of generator at slack bus should be considered when calculating the load margin and critical voltage by using the method of continuation power flow.

因此，在应用连续潮流法计算负荷裕度和临界电压时应考虑平衡节点发电机无功约束问题。

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