Topology-based injection shift factors for reactive power flow subject to load surges

Abstract

This paper develops an injection shift factors for reactive power (QISF) which is dependent on network topology only to achieve a fast linear power flow estimation after multiple loads surges including unexpected large machines inrush and peak hours surges. The proposed approach can estimate power flow subject to surges at an extreme fast speed with acceptable loss of accuracy, which can help system operators modify generator outputs and protect transmission lines from overload. Unlike traditional Newton-Raphson (NR) power flow algorithm and other estimation methods using distribution factors including Jacobian-based distribution factors (JBDFs), the proposed approach is achieved without measurements of system nodal voltages. The proposed approach was tested on IEEE 14 and 30 bus test systems and compared with conventional NR algorithm. The numerical results indicate that with acceptable accuracies, the proposed approach can obtain power flow solutions in significantly short time.