A Unified Processing Method for Hybrid Measurements in State Estimation under Changed Measurement Triggering Mode

The changed measurement triggering mode (CMTM) of state estimation (SE) is presented. Measurements from SCADA and WAMS can be handled uniformly under this mode. The sensitivity relationship among state, measurements and estimated power is analyzed and the tracking SE algorithm based on sensitivity analysis is presented. At each triggering moment, only the changed measurements are handled by this sensitivity analysis method. Test results indicate that this method can not only reduce the computation time for a single SE greatly, but also guarantee good estimation accuracy which is very close to that of weighted least squares (WLS) algorithm.