Project supported by the National Natural Science Foundation of China (Nos. 50507018, 50595414, 50677062, and 60421002);the National Basic Research Program (973) of China (No. 2004CB217902);the National Key Technologies Supporting Program of Chinaduring the 11th Five-Year Plan Period (No. 2006BAA02A01);theKey Grant Project of MOE of China (No. 305008)
By considering the static voltage characteristic of the load, we propose a WAMS/SCADA mixed nonlinear method to estimate the voltage of unobservable buses caused by topology change or phasor measurement unit (PMU) mal...