| Title |
Tiesioginio matricinio keitiklio, veikiančio dvigubo jungimo asinchroniniame generatoriuje, tyrimas / |
| Translation of Title |
Research of a direct matrix converter operating in a doubly-fed induction generator. |
| Authors |
Matulaitė, Gintė |
| Full Text |
|
| Pages |
46 |
| Keywords [eng] |
direct matrix converter ; doubly-fed induction generator ; back-to-back converter ; efficiency ; total harmonic distortion |
| Abstract [eng] |
In this work, the possibility to use a direct matrix converter (MC) in a wind turbine with a doubly-fed induction generator is investigated. Traditionally, such power plants are equipped with back-to-back (B2B) converters, but alternative solutions are being sought out while development of power electronics is rapidly growing and the need to obtain as much energy as possible at the lowest feasible cost is one of the main goals of wind turbine developers. In this research, the realization of a direct matrix converter in a wind turbine with a doubly-fed induction generator is performed by creating simplified models of MC and B2B converters and comparing their power losses and the power quality parameter - the total harmonic distortion. In this study the results show that the average power loss of the B2B converter is 5.76 %, which is slightly lower than the average power loss in the MC (6.20 %). It has also been found, that the smallest total harmonic distortion in the MC is with pulse frequency modulation of 1600 Hz and in the B2B is with pulse frequency modulation of 2000Hz. Total harmonic distortions of input and output currents and voltages were compared while pulse frequency modulation was set to the determined frequency. The biggest difference between B2B and MC was observed in the total harmonic distortions of input currents. It was found that in the MC it is 30 % smaller than in the B2B converter. It has also been investigated that the total harmonic distortion of output voltages is 4.5 % lower in the B2B compared with the MC, and the total harmonic distortion of the output currents is 5 % lower in the MC in comparison with the B2B. |
| Dissertation Institution |
Kauno technologijos universitetas. |
| Type |
Master thesis |
| Language |
Lithuanian |
| Publication date |
2019 |
