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。
2
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。
3
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.