Date of Award

10-1-1995

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Electrical Engineering

Abstract

Although most of the recent methods for reactive power compensation in distribution systems are based on realistic assumptions and reliable optimization techniques, they still suffer from the following drawbacks: (a) complicated or heuristic algorithms with escalating computational times, (b) inflexible design algorithms that do not accommodate special design specifications and data bases, (c) no provision to accommodate lack of observation data and presence of load transfer switches, and (d) inflexible design algorithms that do not address the multistage capacitor switching.This dissertation addresses the above drawbacks. This work is original in the following respects: (1) introduction of a new zone concept to account for feeders with laterals and load transfer switches, (2) introduction and implementation of a new load flow algorithms that iterate on branch losses, (3) use of load factor in current and loss equations to account for load variations, (4) introduction of simple but rigorous and flexible design methodologies that do not require any previous knowledge regarding to number and location of capacitors, and (5) introduction of analytical methods for multistage capacitor switching from the load duration curve.The following are the outcomes of this dissertation: (1) development of methodologies that account for different practical constraints, (2) development of a new CAD tool based on (a) a simplified and flexible reactive power compensation methodology (the Constant Voltage Model) and (b) a rigorous and flexible reactive power compensation methodology (the Voltage Dependent Model), and (3) development of simplified and easy to implement analytical multistage capacitor scheduling methodologies.

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