Effects of harmonics in electrical distribution systems : case studies of Hoan Kiem district, Hanoi and AIT | |
| Author | Phan Le Vinh |
| Call Number | AIT Thesis no.ET-04-14 |
| Subject(s) | Electric power distribution Harmonics (Electric waves) |
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Masters of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ET-04-14 |
| Abstract | Recently, the proliferation of personal computers and conversion to electronic lighting ballasts produced ha1monic problems in office buildings. High harmonic level caused distribution transformers to overheat, neutral conductors to overload and power factor correction capacitor banks to fail. The harmonic problems become a major concern in the electrical distribution system. Today, with the development of each country, the trend of using electronic equipment is increasing day-by-day and generating high level of harmonics in power distribution system. Most of power panel loads in modern office buildings are electronic. Office equipment like computers, printers, fax machines, copiers etc. have highly distorted current waveform that causes voltage distortion in the system. Moreover electronic motor drives are now routinely applied to ventilation fans and elevators. The personal computer is responsible generating the majority of harmonic related problems. The problem of harmonic distortion caused by personal computers is a relatively new phenomenon and is becoming increasingly problematic in office buildings, especially where large quantities of computers are present. This study is aimed at predicting the harmonic distortion level caused by increasing computer loads. Field measurement was conducted on distribution system that supplies electricity to the biggest office buildings in Hanoi, Vietnam and AIT, Thailand. The result of measurement is used to evaluate the present status of harmonic distortion and also to verify the harmonic model of the distribution system. The ability to simulate power harmonic problems in a power system is important. The harmonic problem in office buildings can be simulated by means of HI-WA VE computer simulations. Harmonic levels determined from field measurement on the customer and distribution feeder are compared with the results of HI-WA VE simulations to determine if this analysis tool can be expected to provide useful results. Based on the base case simulation, the harmonic distortion level due to increasing computer loads was predicted and the harmonic elimination method is outlined. |
| Year | 2004 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ET-04-14 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Weerakom Ongsakul; Mithulananthan, Nadarajah |
| Examination Committee(s) | Surapong Chirarattananon; Shrestha, Ram Manohar |
| Scholarship Donor(s) | Electricity of Vietnam |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2004 |