| The growing application of shunt capacitors for voltage support, power factor correction, and system loss reduction, as well as the use of series capacitors (fixed or controlled, for line reactance compensation) will increase the potential risk of transient disturbance amplifications and potential electrical and mechanical resonances in the presence of more and more power electronic devices, and of steam and gas turbines in distributed and co-generation power plants.; To evaluate the promising solutions offered with the introduction of more and more power electronic devices in transmission and distribution systems, such as FACTS (Flexible AC Transmission Systems) Controllers and Custom Power Controllers, as well as to analyze their interaction and impact on either the load or the network side, computer programs based on the EMTP (Electromagnetic Transients Program) are becoming more useful. Its main contributions are summarized as follows: (1) development of a “simultaneous solution for linear and nonlinear control and electric power system equations” (SSCPS) in EMTP-based programs, through the compensation method and the Newton-Raphson iterative algorithm. A “circuit approach” was proposed in this thesis, as an innovative alternative to the solution presented by A. E. A. Araújo in 1993; (2) experimental implementation in MicroTran ® (the UBC version of the EMTP), based on SSCPS, of a “simultaneous solution” for: linear and nonlinear current and voltage dependent sources; independent current and voltage sources, which can also be connected between two ungrounded nodes; hard and soft limiters; transfer functions; mathematical and transcendental FORTRAN functions; (3) development of the subroutine “GATE” in MicroTran, allowing the dynamic control of the turn-on and turn-off times of semiconductor devices (e.g., thyristors, GTO's, IGBT's, etc.), which are modeled as EMTP-based voltage-controlled, switches; (4) development of power electronics simulation cases in Micro Tran, using the simultaneous solution approach (SSCPS) for the dynamic control of semiconductor switching devices (as in a three-phase six-pulse thyristor-controlled bridge rectifier, and a three-phase PWM voltage source inverter (VSI)) and evaluation of current and voltage waveforms; (5) interaction with a Brazilian utility company and industries for the realization and analysis of field measurements of electromagnetic phenomena affecting the quality of power. (Abstract shortened by UMI.)... |
