Abstract: The synchronous phasor measurement unit(PMU) configuration causing state estimation partition decoupling was studied, a partition coupled state estimation model was established in which the PMU was introduced. By using the voltage measurement of PMU, a whole electric power system is partitioned to several sub-system nets for state estimation respectively, and there are not data exchange between the sub-systems. The branch current phasors of PMU can be transformed into relevant node voltage phasors or relevant branch tidal current, the accuracy and redundancy of measurement data are increased, and the performance of state estimation is raised. The simulation arming at IEEE30 node calculation example shows that when the PMU measurement accuracy is higher, the accuracy and speed of partition decoupled state estimation model was increased compared with that of the routine model using PMU. Along with the increase of partition and the applicaton of computer parallel processing technique, the real time state estimation of electric power system will be possible.

Key words: synchronous phasor measurement unit(PMU), electric power system state estimation, partition decoupling