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An Electronic Load Compensator For Arc Furnaces (Reactive Current, Static Var Compensator)., Mickey Dale Cox
An Electronic Load Compensator For Arc Furnaces (Reactive Current, Static Var Compensator)., Mickey Dale Cox
LSU Historical Dissertations and Theses
An electronic compensator is described that is capable of compensating the reactive current drawn by arc furnaces and other nonlinear, time-varying loads. Consisting of three independent single-phase pulse-width modulated (PWM) inverters, along with appropriate controller and detector stages, the proposed compensator responds quickly to sudden load changes and compensates the reactive current drawn by the load. Unlike conventional static var compensators, the electronic compensator can also supply the active current demanded by the load if an energy source independent of the utility is available. Simulations are conducted, including the modelling of the furnace current and voltage waveforms during the early …
Contribution To Power System Harmonic Analysis., Yahia Baghzouz
Contribution To Power System Harmonic Analysis., Yahia Baghzouz
LSU Historical Dissertations and Theses
In recent years, power system harmonic levels have increased significantly due to the ever-increasing use of nonlinear loads which primarily consist of power electronic devices. The effect of these harmonics on power system components represents a serious problem to utility companies and consumers. A survey of power system harmonics as generated mainly by static ac/dc power converters is presented. Aspects concerning harmonic injection, their effects on system components and harmonic reduction techniques are included. Harmonic analysis methodologies are discussed and compared in terms of efficiency and accuracy. The need of a stochastic treatment of harmonic voltages and currents is clearly …
Model Reduction Of Stochastic And Deterministic Continuous Time Linear Systems (Lypunov Equation, Schawrz Approximation)., Khier Benmahammed
Model Reduction Of Stochastic And Deterministic Continuous Time Linear Systems (Lypunov Equation, Schawrz Approximation)., Khier Benmahammed
LSU Historical Dissertations and Theses
Two new approaches for reducing the order of large scale continuous systems are presented. The first approach is a modified version of the aggregation technique. It uses the matching properties of the steady state output covariance and the Markov parameters of the high order system to those of the r('th) order model. This approach also uses a new algorithm derived for the computation of the controllability and observability Grammians, to produce controllable, observable and stable low order models. These is no unique method available for evaluating the aggregation matrix or the matrix relating the system state vector to the model …