دانلود ترجمه مقاله روش حفاظت غیرارتباطی برای شبکه های توزیع مش و شعاعی با DG مبتنی بر حالت سنکرون

Nowadays, overcurrent relays are manufactured based on the digital technology, which can be programmed for standard or any desired characteristics. The non-standard time-currentvoltage characteristic proposed in this paper can be used in both grid-connected and islanded modes of DN operation with synchronous-based DG units. The same relay settings are used for the both modes of operation, hence no communication links are required for resetting the relays for appropriate modes of operation. Moreover, the TCVC relay uses local measurements for coordinated operation during a fault condition, whereas most previous methods use horizontal links between the DN relays and/or vertical links to a master protection unit for isolating the faulted area. The TCVC performance is validated by simulation study on the meshed and radial DN configurations. For different DG sizes and locations under different fault types, the results show successful operations of the proposed TCVC for grid-connected and islanded modes of operation for all the cases. The results are also compared with the standard overcurrent characteristic and a recent non-standard characteristic proposed in the literature. It is shown that the proposed TCVC achieves a notable reduction in the total operating times of the DN relays compared with these characteristics.