Review of loss of excitation protection setting and coordination to the generator capacity curve

Abstract

After the liberalization of electricity market the absorption of reactive power by some generator is subsidized in order to support the power system voltage regulation. The setting of the loss of excitation protection is essential to warranties the correct operation of the generator in the under-excited area. A conservative setting does not allow the maximum reactive power absorption. On the other hand a setting which allows the maximum reactive power absorption could be dangerous. This paper presents a review of different settings recommendations for the loss of excitation protection and theirs coordination to the synchronous machine capacity curve. The settings have been validated through computer simulations. © 2017 IEEE.