PRECISION IMPROVEMENT AND PMU PLACEMENT STUDIES ON STATE ESTIMATION OF A HYBRID MEASUREMENT SYSTEM WITH PMUS

GPS based synchronous Phasor Measurement Unit (PMU) is a new type of measure unit with high precision. The modeling of a hybrid measurement system is proposed which includes traditional SCADA measurements and partially equipped PMUs. Based on the model, the precision improvement of state estimation due to incorporation of PMUs can be analyzed quantitatively and the scheme of PMU placement can be established.