| Author | Paudel, Ramesh |
| Call Number | AIT Thesis no.ET-08-06 |
| Subject(s) | Electric power systems--Control
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| Note | Submitted in partial fulfilment of the requirements for the degree of Master of Engineering in Energy |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ET-08-06 |
| Abstract | Technology, environment and economy are the major driving forces that encourage generation at load site rather than centralized facilities. Till now, almost all utilities have the power generation from central power plants which are located far away from load centers. Due to losses and voltage drop in transmission and distribution system, consumers are forced to get low quality power supply. With technological innovations, most of the appliances in residential sector and control systems in industries use electronic components. For reliable performance of these electronic equipments good quality of power supply is a must. With the growing concern of world facing global warming problem due to green house gas . emission from power generation, renewable technologies for generation such as photovoltaic, wind, fuel cells, micro turbines and micro-hydro are gaining much more interest. These renewable technologies can be used for small scale generation and are becoming more popular not only because of their environment friendliness but also due to their suitability for small scale generation. The penetration of these small scales "distributed generations" in power system is sure to increase in near future. A proper management of these distributed generations is a must, in order to keep power system safe from their negative impacts. Microgrid is a solution to this problem of managing distributed generations. 'Micro grid' (MG) is an independent entity which combines loads and distributed generators (DG) and can be controlled locally instead of central dispatch from the grid. Control flexibility allows MG to present itself as a single aggregated load to the power system. MG follows grid rules and separates itself from distribution system during disturbances without harming the integrity of distribution network. It helps customers to benefit by meeting their demand for power as well as their heat requirement. Customers will also be able to enjoy uninterrupted power supply with enhanced reliability and better power quality. From utility prospective MG helps in congestion management, manage local power requirement and voltage support and delay requirement of new power plants. In this work, a method using loss sensitivity factor has been developed in order to find a suitable location of MG within a distribution system. Steady state analysis has been performed in IEEE 33 bus and IEEE 69 bus system with and without MG connected to these systems. Also steady state analysis of MG and distribution system has been done both in grid connected mode and island mode of operation of MG separately. Since MG remains intact with grid system most of the time, distributed generations within MG are placed in such a way that total real power loss of system is minimized. The methodology developed is finally implemented in a real system of Nepal. Results obtained from this work show that system loss can be reduced nearly by 46% with the introduction of MG into distribution system. Similarly, voltage regulation wrt sending end voltage has been improved from 9.63% to 0.45%. Furthermore, voltage profile of the system is greatly enhanced. All these results technically favour formation of MG within grid system |
| Year | 2008 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ET-08-06 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Nadarajah, Mithulananthan |
| Examination Committee(s) | Shrestha, Ram M.;Wang, Alex Yaw Jue;Weerakorn Ongsakul |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2008 |