Controlled Islanding Solution for Blackout Prevention in Transmission Systems

When all other preventative measures have been tried and found to be ineffective as a result of an occurrence, controlled islanding is proposed as a last resort. Finding a balance between three vital considerations—when and where to island, as well as how to forecast the following dynamic stability of each island—is essential to the successful execution of an islanding strategy. Finding this balance is the key to a well-executed plan. This study presents a comprehensive strategy for averting widespread power failures by use of a wide-area measuring system, including the three primary steps necessary to achieve fault-islanding success. In most cases, power failures and blackouts happen after a series of cascading outage phases. In these circumstances, the transient stability was examined online prior to the imminent blackout using an adjusted single machine equivalent (SIME) approach, and it was determined that the onset of island-sponsored transient instability could be predicted. Following the completion of islanding, SIME was put to use to assess the dynamic stability of each island. Additionally, it was put to use to validate the stability of candidate island cut sets prior to the commencement of tracked islanding. All feasible islanding cut sets were provided to return to a call for where to island using the skilled flow (PF) tracing procedure. The best possible candidate island was found with the help of SIME. If there was no projected island, all newly constructed islands were subject to the same load shedding and massive generator tripping. In order to forestall the occurrence of blackouts, a three-stage controlled islanding method was finally put to the test on a ten-unit IEEE 39-bus grid.