On-load tap changer control method for a power excitation chain, related unit and power excitation chain comprising such unit

摘要

The present invention relates to an on-load tap changer control method for a power excitation chain. The chain includes a generator, a step-up transformer equipped with an on-load tap changer and connected on the one hand to the output of the generator and on the other hand to a transmission bus, and an excitation control system with a generator automatic voltage regulator (AVRG) and one excitation limiter (OELG, UELG). The method monitors the excitation conditions of the generator, activates the one excitation limiter (OELG, UELG) when the monitored excitation conditions are outside a predefined range, and temporarily inhibits the change of step of the on-load tape changer.