Available at: https://digitalcommons.calpoly.edu/theses/3017
Date of Award
5-2025
Degree Name
MS in Electrical Engineering
Department/Program
Electrical Engineering
College
College of Engineering
Advisor
Taufik
Advisor Department
Electrical Engineering
Advisor College
College of Engineering
Abstract
This thesis investigates the modeling, simulation, and analysis of a Green Seaport power system integrating photovoltaic (PV) generation, battery energy storage systems (BESS), and coordinated protection within a hybrid AC/DC framework. The work improves a previously established model, enhancing it with detailed protection studies and simultaneous AC/DC power flow analysis using EasyPower software. The system was evaluated under a wide range of operating conditions, including varying solar irradiance, battery charge and discharge states, and both full and zero load conditions. Key performance indicators included voltage regulation, power factor behavior, equipment loading, protection device coordination, and total system power losses. Simulation results confirmed voltage stability across all AC buses and highlighted the importance of capacitor banks in maintaining unity power factor during low-load or high-reactive-power conditions. On the DC side, overvoltage scenarios were traced to software limitations, while undervoltage conditions reflected real-world design constraints. Equipment loading varied by subsystem, prompting a transformer upgrade to handle unexpected backfeeding conditions. Loss analysis showed that power factor correction significantly reduced power losses. Protection coordination was validated across 15 fault locations, with most cases successfully isolating faults at the nearest device. A few coordination compromises were required, but they preserved overall system integrity. The results demonstrate that the proposed system can maintain reliable, efficient operation in a seaport electrification setting.