Modern industrial systems are very complex installations with high automation level and capability of isolated (islanded) operation due to usage of synchronous generators. Typically, the islanded operation occurs due to a fault in the distribution system. Since such installations are usually connected to distribution networks, these installations are subject to the technical requirements imposed by the distribution utilities. Thus, the disconnection of the industrial system with generation from the distribution system during islanding is a mandatory procedure. After the islanding detection, as soon as possible the electric separation between the utility and the industrial systems must be carried out. Normally, this disconnection is conducted by opening the circuit breakers installed in the low voltage side of the main industry transformer. As consequence, the utility can procedure with the network restoration for example, through automatic reclosers. Immediately after the disconnection, it is necessary to start actions to guarantee that the industrial system can continue operating satisfactorily. Some examples of needed actions are: alterations in the governor regulator and excitation system controllers of the synchronous generators; alteration in the relays settings in order to guarantee selectivity and coordination of the protection systems and implementation of the rejection load system. Therefore, the objective of this project is to investigate the dynamic behavior of industrial systems with synchronous generators during islanded operation. Based on this investigation, it is intended to determined the main technical requisites necessary to guarantee the security level and the system stability.
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