Study on Low Voltage Direct Current Distribution System Supplied by Solar Energy
| dc.contributor.advisor | Getachew, Biru (PhD) | |
| dc.contributor.author | Awraris, Getachew | |
| dc.date.accessioned | 2019-06-25T04:13:40Z | |
| dc.date.accessioned | 2023-11-28T14:26:38Z | |
| dc.date.available | 2019-06-25T04:13:40Z | |
| dc.date.available | 2023-11-28T14:26:38Z | |
| dc.date.issued | 2018-06-26 | |
| dc.description.abstract | Low voltage direct current distribution system has been widely used in data centers, aerospace, automotive and marine. Nowadays dc distribution system gaining advantage over ac system in residential applications due to increasing number of dc based loads, advancement of power electronic convertors and widespread use of renewable energy resources like solar and wind. However lack of standard voltage level and protection mechanisms are major challenges for dc distribution system for residential application. This thesis work focuses on studying the technical and economic feasibility of low voltage direct current distribution system supplied by solar energy as a renewable source. Household appliances are selected and assessment is made on their energy consumption. Finally low voltage direct current distribution system model is designed and simulated using Matlab/Simulink R2016a software. 120V dc voltage level is set as the optimal for low voltage dc distribution system for residential applications on the basis of efficiency, compatibility and cost. Using this voltage level 0.88% energy efficiency improvement is achieved over its rival 220V ac system for 7.4kW household load. Constant load voltage is maintained using PI controller coupled with buck convertor irrespective of variation of load and irradiance. 120V dc system is classified under extra low voltage level having low risk and safe for human beings for indirect contact. Consumers can get electricity accesses from the proposed dc system at a unit energy cost of $0.21/kWh. Resistive home appliances can be directly connected to the proposed system, whereas electronic loads with switch mode power supplies and rotating loads can be connected to dc distribution system with little modification done on the internal circuitry. The existing installation wires can be used for low voltage dc distribution system without any rapture in insulation as dc systems have less potential stress over ac system for the same voltage level. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/18574 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | DC distribution | en_US |
| dc.subject | Compatibility of home appliances | en_US |
| dc.subject | safety issues | en_US |
| dc.subject | load modeling | en_US |
| dc.subject | low voltage dc distribution system design | en_US |
| dc.title | Study on Low Voltage Direct Current Distribution System Supplied by Solar Energy | en_US |
| dc.type | Thesis | en_US |