Sizing AC/DC building distribution network part III

• Main Author: Hendro
• Other Authors: Wang Peng
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2020
• Subjects: Engineering::Electrical and electronic engineering::Electric power; Engineering::Electrical and electronic engineering::Power electronics
• Online Access: https://hdl.handle.net/10356/139864
• Institution: Nanyang Technological University

With the gradual changes of the electrical load types, growth of DC distributed generation (DGs), and the advancements in direct current (DC) power electronics have shown the feasibility of having DC distributed system in the residential micro-grid application. Renewable resources such as solar photovoltaics (PV) and fuel cells are generating DC sources, and the source converts to alternating current (AC) sources via DC/AC conversion techniques, which should be connected to the AC grid. For DC inherent sources to be connected to AC grids, an additional DC/AC converter is required, which results in conversion losses. Thus, the application of the DC distributed system would allow the reduction of many conversion stages, which would result in decreasing the components, power losses, and an increase in reliability of the electrical system such as eliminated harmonics and unbalances issues. Nevertheless, it is not possible to directly push toward a full DC micro-grid immediately as large electrical goods are still required AC power to operate. Therefore, both AC and DC micro-grid are needed to account for AC and DC load types. The combination of both AC and DC micro-grids is known as the hybrid AC/DC micro-grid, which could harmonize both AC, DC sources, and loads for better efficient power systems. This project presents the modeling of a hybrid AC/DC micro-grid system for the residential building of Singapore, considering the PV array interfaced with DC/DC boost converter and a three-phase voltage source converter (VSC) based on the MATLAB/Simulink. The AC and DC loads of the building are calculated. The size and selection of the PV unit, inverter, and energy storage for the system design are presented.