| Analysis and understanding of power quality events are important for power engineers to eliminate the cause of these events. Accurate and efficient simulation of power quality events is therefore needed. This has so far been done by using a version of the electromagnetic transients program and it has served its purpose well. However, increasing complexity in modeling today's power systems forces engineers to look for more powerful and improved tools for event analysis and power quality assessment. Hence, new models and efficient simulation methods are introduced in this dissertation to address this need.; A new and accurate arc furnace model is developed first. Then, a digital flickermeter model, commensurate with the IEC standards, is implemented in Matlab environment. This facilitates the evaluation of the flicker severity of the simulated arc furnace data.; Direct calculation of the periodic steady state response of nonlinear systems is investigated next. A new algorithm, which accelerates the periodic steady state solution of power networks with nonlinear and switching elements, is introduced.; Finally, a unique approach to frequency dependent line modeling and simulation is developed. The main contribution is that the frequency dependence of the modal transformation matrices is taken into account. The proposed method improves not only the accuracy but also the computational burden of transient simulations. |
