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A SINGLE-PHASE FREQUENCY CHANGER WITH SINUSOIDAL INPUT AND OUTPUT CURRENTS
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| Author(s) |
J. Rodriguez; E. Wiechmann; J. Pontt; J. Zamorano |
| Abstract |
This paper presents a high performance frequency changer with only four power switches for single-phase load and single- phase source. The converter uses two power transistors and two antiparalel diodes working as a switch mode rectifier (SMR) to generate a controlled DC voltage. Two power switches are used to generate a sinusoidal load current. The output current has controlled amplitude and frequency. The input current of the frequency changer is also controlled, has a practically sinusoidal waveform and keeps in phase with the source voltage independently of the amplitude and frequency of the output current. The converter works with a high power factor for different load degrees (PF > 0.99). The front-end SMR permits bidirectional power flow and for this reason it provides an excelent control of the DC voltage. The control strategy is very simple. With the addition of two power switches it is possible to supply a three-phase load, like a three-phase machine. The vector control of a three-phase induction motor driven by this converter is also analysed. |
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| Filename: | Unnamed file |
| Filesize: | 2.505 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-01 by System |
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