The large dimension, power system's structure and special working status will cause inter-area oscillations.

现代电力系统规模大，电网结构和特殊运行状况会导致系统内存在区域间振荡现象。

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It can be applied to external type 2 and external type 1 routes, but not to intra-area and inter-area routes.

它可应用于外部2型和外部的1型路线，而不是内部地区间和地区航线。

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This controller's input signal is the voltage phase Angle difference between two areas obtained by PMU, which can effectively reflect the inter-area low frequency oscillation characteristics.

该控制器以PM U得到的区域间电压相角差信号作为输入信号，能够直接有效地反映区域间低频振荡特性。

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