Introduction-power system measurement Control Center 0☐ V P and Q measurements n 2例 电力集镜扩城闲量与拉的坚矗产来变写 家电网电力系统广域测量与控制四川省重点实验室 Introduction-power system measurement Control Center V V : P and Q measurements n = 2 N - 1 1.5  m / n  3