Dynamic compensation of electrical power systems using a new BVSI STATCOM

This thesis deals with the study of dynamic compensation of electric power systems using the static synchronous compensator (STATCOM). A new multilevel binary voltage source inverter (BVSI) which is modular in structure and introduces minimum harmonies into the system has been proposed to build the STATCOM configuration.; Initially, the application of STATCOM for the damping of torsional oscillations that occur in a series compensated ac system is examined. The IEEE first benchmark system is considered for this study. A STATCOM with PI controller is employed at the generator terminal to regulate its terminal voltage. In addition, dynamic performance of the nonlinear system with an optimized STATCOM controller is evaluated for a three-phase fault condition. The results from the analytical and digital simulation studies reveal the technical feasibility of augmenting STATCOM usage for damping of turbine-generator torsional oscillations in series compensated ac systems.; The use of discretely switched power electronic devices results in contamination of electrical supply due to harmonics. A new multilevel binary voltage source inverter (BVSI) with separate dc sources is introduced. The dc source voltages are staggered and controlled in binary proportion of Vdc, 2Vdc, 4Vdc etc., where Vdc is chosen to get the desired ac voltage output. The selective harmonic elimination modulation technique is used to either completely eliminate or minimize the harmonies. Application of such a compensator for dynamic compensation of 13.8 kV distribution system is examined through transient studies. This inverter can generate almost sinusoidal output waveform, reducing its harmonic content while employing the least number of components and providing a modular structure.; A laboratory prototype of 400 vars, 120 V, 1-phi, 3-level, 15-steps binary voltage source inverter is implemented for real time tests. A digital controller using Siemens SAB 80C537 8-bit microcontroller is developed for this prototype.; The results from digital simulation and hardware implementation show the effectiveness of BVSI STATCOM as a dynamic compensator under a wide range of steady state and abnormal operating conditions. The low total harmonic distortion validates the effectiveness of the BVSI structure and selected harmonic elimination algorithm in minimizing or eliminating harmonics introduced into the system. The BVSI STATCOM can smoothly switch the operating mode from leading to lagging and vice versa without jeopardizing its dynamic performance, steady state behavior, and harmonic containing capability. The capacitor voltage controller regulates the capacitor voltages in binary proportion. (Abstract shortened by UMI.)...