State estimation for active distribution networks basedon multisource hybrid measurements

Abstract

According to the fact of long-term coexistence of the remote terminal unit(RTU), the phasor measurement unit(PMU) and the advanced metering infrastructure(AMI) in active distribution networks, In this paper, a hybrid algorithm of state estimation based on hybrid measurements of RTU, PMU and AMI is presented, which consists of nonlinear static state estimation, linear static state estimation and linear dynamic state estimation. Linear dynamic state estimation and linear static state estimator tracks the changes of node injection active and reactive power utilizing PMU and RTU measurements, which can provides highly accurate virtual measurements for nonlinear static state estimation in the absence of AMI measurements. The proposed algorithm can shorten the calculation cycle and improve the accuracy of nonlinear static state estimation, and promotes the ability of state forecasting for active distribution networks. The effectiveness of the proposed algorithm is illustrated with numerical simulation using the IEEE 13-bus system.