Dynamic State Estimation with Phasor Measurement Units Considering Sensitive Constraints

Abstract

To prevent and regulate network blackouts due to cascade errors in power systems, dynamic state estimation is necessary. For accurate network states, an online dynamic state estimation (ODSE) with the integration of phasor measurement unit (PMU) and conventional measurements is proposed in this study. The deployment of PMUs at sensitive buses is formulated using the constrained integer linear programming method. To provide the sensitive buses for the deployment of PMUs in-network, the stability index and redundancy restrictions are defined. As a part of the ODSE technique, a Jacobian matrix is created by integrating conventional measurements with PMU measurements taken at sensitive buses. An evaluation index (RMSE) is presented to evaluate the results of ODSE. The proposed ODSE is implemented in MATLAB for IEEE -14, -30, and -57 bus networks and compared to the standard state estimation approach.