Showing papers in "The South Pacific Journal of Natural Science in 2006"

Impact of voltage unbalance on the performance of three-phase induction motor

Abstract: Availability of quality power has become an important issue for industrial utilities due to frequent performance variations in process industries. Increase in the generating capacity has not kept up pace of power demand, which results into shortage of power supply and power system network is normally subjected to varying and unequal loads across the three phases. Continuous variation of single-phase loads on the power system network leads to voltage variation and unbalance, most importantly; the three-phase voltages tend to become asymmetrical in nature. Application of asymmetrical voltages to induction motor driven systems severely affects its working performance. This paper presents the effects of voltage variation and unbalance on the performance of an induction motor driven centrifugal pump with a case study.

Generation capacity adequacy evaluation based on peak load consideration

Abstract: This paper describes a new methodology based on peak load consideration for reliability evaluation of a generation system. The methodology has been developed using Simpson’s (1/3)rd rule for loss of load probability (LOLP) evaluation. Load models are considered as straight line and stepped load duration curve for reliability evaluation. The LOLP evaluation is based on peak load consideration. The probability of load exceeding the generating capacity has also been considered in LOLP evaluation.

A new algorithm to enhance power transfer using series capacitor

Abstract: The compensation of transmission line reactance by means of series compensation is an effective method increasing the power transfer capacity and thereby improving the transient stability of the power system. This paper presents a novel series compensation method to increase the power capacity of the system. The proposed method is applied to a 9-bus power system.