20-09-2016, 09:29 AM
Technique to Develop Auto Load Shedding and
Islanding Scheme to Prevent Power System Blackout
1455214634-TechniquetoDevelopAutoLoadSheddingand.doc (Size: 27 KB / Downloads: 5)
Abstract
Abnormal condition in a power system generally leads to a fall in system frequency, and it leads to system blackout in an extreme condition. This proposed presents a technique to develop an auto load shedding and islanding scheme for a power system to prevent blackout and to stabilize the system under any abnormal condition. The technique proposes the sequence and conditions of the applications of different load shedding schemes and islanding strategies. It is developed based on the international current practices. It is applied to the thermal Power System (TPS), and an auto load-shedding and islanding scheme is developed. The effectiveness of the developed scheme is investigated prototype model different abnormal conditions in TPS.
The usual solution to rescue the system from this sort of state is the load shedding. However, in some cases the load shedding may be unnecessary as the system makes itself stable by providing additional input from its stored kinetic energy or from the spinning reserve or by lowering the system frequency within acceptable limit. In some cases, the magnitude of load shedding may be inappropriate, that is more or less than required, to make the system stable by maintaining the system frequency within acceptable range. In some cases, only load shedding cannot rescue the system from total collapse. In that case, the system may be disintegrated into a number of islands. The main advantages of islanding are 1) easier to minimize generation-load imbalance in an island than that in a large integrated system and 2) quicker to restore the system by integrating the islands than restoring the whole system from a blackout state