AN ADAPTIVE SHORT-TIME COMPENSATION SCHEME FOR IMPROVING POWER SYSTEM STABILITY
Al-Senaidi, Saleh Hummood Abdu-Allah
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Successful operation of a power system depends largely on the engineer's ability to provide reliable and uninterrupted service to the loads. The reliability of a power system supply implies much more than merely being available. Ideally, the loads must be fed at constant voltage and frequency at all times. The first requirement of reliable service is to keep the synchronous generators running in parallel and with adequate capacity to meet the load demand. Maintaining such an operation and dealing with its problems fall under the heading of "power system stability." This thesis presents an adaptive short-time compensation and reclosing technique for improving power system transient stability. The fundamental concept of such a technique is to interrupt unsymmetrical faults, namely line-to-line, single and double line-to-ground faults on double-circuit transmission lines using selective-pole switching. The transmission system is then balanced using Thyristor Controlled Series Capacitors in the interrupted phases. Adaptive selective-pole reclosing is then used for reclosing the tripped phase(s). To explore the effectiveness of the proposed adaptive short-time compensation and reclosing technique, investigations are carried out on a sample multi-machine powersystem through time simulations using the EMTP.