| This research focuses on voltage and reactive power control on the distribution system in an atmosphere of uncertainty. It also investigates the incorporation of wind turbines into load-flow analysis. It is widely recognized, that in practice, data are only known with finite accuracy and are hence, inexact in nature. In this research, fuzzy load-flow is used to handle this uncertainty. Fuzzy load-flow is based on fuzzy-set theory which has the ability to handle various forms of uncertainty including that from random variables.; The fuzzy load flow technique [FLFT] presented in this dissertation, is different from the approach of other authors, in that it is more straightforward. It is based on fuzzy numbers and fuzzy arithmetic, and it calls for only one power-flow solution. The introduction of partial fuzzy arithmetic along with the use of fuzzy arithmetic and point-by-point calculations is significant. The result is a simple and fast technique. The proposed technique is suited for loosely meshed distribution systems with multiple sources. These attributes make this new approach quite attractive for application in today's distribution system which is characterized by the presence of distributed generators and meshes.; The voltage and reactive power control problem is de-coupled into sub-problems characterized by the reaction speed of the different control devices. The sub-problem categories are "fast", "medium", and "slow", based on the frequency with which the control devices are adjusted. The control elements include transformer load tap changers (LTC), voltage regulators, and switched capacitors. Fuzzy models for these control devices are introduced and effectively demonstrated.; There is a great demand for alternative sources of electric energy. In this research, a fuzzy model for the wind turbine generator is presented. The active power produced by the wind turbines and the reactive power absorbed are expressed as functions of the wind velocity. This research shows a successful incorporation of the wind turbines into the distribution system.; The various parts of this research have their individual merits. When they are combined, the result is an algorithm with a wide range of uses including analyzing, planning, and designing of distribution systems. |
