Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 1995.11a
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- Pages.258-260
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- 1995
Analysis of the Unbalance of DC Link Voltage in 12-step Inverter with 2-Phase Chopper Preregulator
2상 쵸퍼 Preregulator를 갖는 12-step 인버터에서의 DC Link단 전압 불평형 해석
- Nho, Eui-Cheol (Dept. of Elec. Eng., Nat'l. Fisheries Univ. of Pusan) ;
- Kim, In-Dong (Rolling Stock R&D Center, DHI ltd.)
- Published : 1995.11.18
Abstract
This paper deals with the voltage unbalance of DC link voltage in series connected two 6-step inverters with double chopper preregulator. Each output of the 6-step inverter is connected to each transformer. The secondary windings of one of the transformers is zig-zag connected and the other star connected. The secondary terminals of the two transformers are series connected which makes 12-step output voltage waveform. In this case, the characteristics of the two transformers are rather different each other. The difference results in the voltage unbalance of the two 6-step inverter input capacitor voltages which make the DC link voltage. The degree of the voltage unbalance is analysied with the variations of load power, load power factor and % impedance of the transformer.
Keywords