| Author | Kritsnai Jantawongsri |
| Call Number | AIT Thesis no.ET-11-10 |
| Subject(s) | Distributed generation of electric power
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Energy. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ET-11-10 |
| Abstract | Microgrid system (MG) includes distributed generators and loads in a small distribution system in either grid connected or isolation mode. In this thesis, PSO with Time-varying Acceleration Coefficient (PSO-TVAC) is proposed to minimize the real power loss in MG system. There are two modes under this study comprising grid connected and islanding mode. For each mode, four MG cases are considered comprising of (i) case 1: MG with DG supplying real power only, (ii) case 2: MG with DG supplying reactive power only, (iii) case 3: MG with DG supplying real power and consuming reactive power and (iv) case 4: MG with DG regulating the bus voltage. For grid connected MG type, PSO-TVAC can determine the suitable sizes and locations of multiple DG on the 33-bus and 69-bus radial MG distribution systems. Test results indicates that their real losses are less than repetitive load flow, basic particle swarm optimization (BPSO), adaptive weight particle swarm optimization (APSO), global best, local and near neighbor best particle swarm optimization (GLN-PSO), and improved reinitialized social structures particle swarm optimization (IRS-PSO). Moreover, case 4: MG with DG regulating the bus voltage on the 69 radial bus radial distribution MG system gives the minimum loss because it can supply both real and reactive power. The loss by this case can be reduced by 97.82% compared to the base case. With regard to islanding mode, optimal real power loss from three cases are less than base case including MG with DG supplying real power only, MG with DG supplying real power and consuming reactive power and MG with DG regulating the bus voltage. Case 4: MG with DG regulating the bus voltage on both the 33 and 69 radial bus radial distribution MG system gives the minimum loss because it can supply both real and reactive power. The loss by this case can be reduced from the base case by 36.11 % and 57.72% for the 33 and 69 radial bus radial distribution MG system respectively. Whereas, optimal real power loss from case 2: MG with DG supplying reactive power only on the 33 radial bus radial distribution MG system is higher than that of the base case by 27.54% because this case supplies only reactive power, but does not supply real power to the MG system. As a result, the MG system has to acquire real power from the larger DG only, which results in higher real power loss. |
| Year | 2011 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ET-11-10 |
| 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) | Weerakorn Ongsakul; |
| Examination Committee(s) | Singh, Jai Govind;Marpaung, Charles 0.P.; |
| Scholarship Donor(s) | Royal Thai Government Fellowship.; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2011 |