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New Adaptive Decentralize Under Frequency Load-Shedding Algorithm

when there is a disturbance in the power grid, some power generator units are disconnected from the grid. The frequency starts to decrease. Therefore, multi-stage frequency relays are used in power grids. The most crucial issue with the conventional method is fixed setting; in the standard method available for such relays, various phenomena are included in the simulations, and fixed settings are applied to the relays. In power grids, in case of large disturbance, conventional frequency load shedding methods are not efficient. In conventional load shedding methods, only the frequency variable is considered, so in this article, besides the frequency variable, The voltage variable and the frequency derivative are also used to perform the load shedding operation. In practice, what has been done in this paper is to present a load shedding algorithm in critical situations. The frequency can be stabilized in the allowable value, and since this operation is performed decentralize, there is no need for telecommunication between relays. What gives the proposed method a distinct advantage over other methods is its practicality. Thus, this algorithm can be quickly done by digital relay configuration software (such as DIGSI and PCM600 software used for Siemens and ABB relays, respectively). On the other hand, the simulations were performed in a real grid related to the Khorasan grid and compared with the common method used for frequency load shedding in Iranian grids, and the superiority of this method is shown. All simulations are performed in the DigSilent software environment.