在电力系统潮流计算中,发电机节点的电压恒定,常作为PV节点,其幅值保持不变。当系统中某些负荷节点的无功负荷增加时,发电机节点的无功出力也将增加。试推导发电机节点无功出力增量与负荷节点无功负荷增量之间的灵敏度系数,即△Q G =S GD △Q D ,求S GD 。试按PQ解耦(只考虑△Q D 引起节点电压幅值的变化)和不解耦(考虑△Q D 引起节点电压相角和幅值同时变化)两种情况讨论。
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