Power Stability Investigation and Control of Rail Way Power Supply System using Particles Swarm Optimization of Proportional Integral Controller (Case Study:- Lebu to Adama line)

Abstract

Due to the use of transformers, power electronic converters, and variable loads, power quality is the primary area of concern in electric traction systems. It always needs a power supply system that is effective, dependable, and economical. The 752.6 km long Ethio Djibouti railway line connects Nagad, Djibouti, to Addis Ababa, Ethiopia, and is powered by a 25 kV, 50 Hz AC overhead power source. This thesis discusses traction power supply system modelling, power quality evaluation, and improvement for the Lebu to Adama railway line. The initial power factor in the ethio-dijibuti line in Lebu-Adama line is 0.67. The components of the traction power supply system's relevant data and parameters have been gathered, modelled, and examined. All significant traction power supply system components have undergone mathematical study and modelling, which includes both constant and variable power models. The traction power variation experienced by moving trains is accurately simulated by the variable power model. Analyses of train dynamics are also performed. A STATCOM has been analyzed, modelled as a controller, and applied to return good reactive power compensation and boost poor power factor while maintaining line voltage within the specified range. This STATCOM uses an algorithm based on instantaneous active and non-active current theory. To enhance performance, the PI controller's parameters are tuned using particle swarm optimization. In order to improve current and voltage, STATCOM is additionally simulated as an LCL filter-enhanced SVG optimized model. The following phase is simulating the entire system using static and dynamic power models in the MATLAB/Simulink environment and contrasting it with the model of the existing system devoid of the controller. 99% of reactive power is compensated thanks to the usage of this approach, and a power factor of 0.9999 has been maintained throughout the motion. Furthermore, the overall harmonic distortion decreases to 0.5%, which is below the standards set by other countries. The dynamic performance parameters are also enhanced in this thesis study.