Monitoring of EPS operation by the state estimation methods

State estimation is the most important procedure providing the electric power system control with reliable quality information. The role of state estimation problem is getting more pronounced with transition to a qualitatively new level of technologies and control of power systems based on the wide-area monitoring and control systems (WAMS/WACS). Currently the electric power system (EPS) state estimation methods are developed on the basis of combined application of conventional measurements from SCADA and phasor measurement that are provided by PMU. Practical application of PMUs reveals a number of factors that affect the correctness of their measurements. Therefore, the need arises to verify the PMU measurements. The paper suggests the approaches to validation of PMU measurements on the basis of test equation technique. Consideration is given to the modification of state estimation algorithm by combining the SCADA and PMU measurements.