The effect of branch parameter errors on voltage stability enhancement schemes

Abstract

Branch parameter errors may affect the success of voltage stability enhancement schemes. This work considers errors of varying sign and magnitude in the parameters of transmission lines. The considered voltage stability enhancement scheme is based on a central state estimator and on a distributed monitoring of individual lines. The state estimator incorporates synchronized phasor measurements. The applied voltage stability enhancement scheme is based on monitoring individual branches and on load shedding, for various thresholds of the applied stability indices. A discussion on voltage stability enhancement schemes and branch parameter errors is followed by simulations on two case studies involving two IEEE studies and both static and transient contingencies. In conclusion, dealing with branch parameter errors in the context of voltage stability enhancement schemes is discussed.