A Power Electronic Transformer with Low Voltage Ripple in DC Bus
In high-voltage distribution network, cascaded H-bridge converter is often adopted in PET(power electronic transformer) to reach the voltage level of high-voltage side. As the DC bus of cascaded H-bridge converter has to be separated, the second harmonic voltage ripple fluctuation that is difficult...
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| Main Authors: | , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Control and Information Technology
2017-01-01
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| Series: | Kongzhi Yu Xinxi Jishu |
| Subjects: | |
| Online Access: | http://ctet.csrzic.com/thesisDetails#10.13889/j.issn.2095-3631.2017.04.300 |
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| Summary: | In high-voltage distribution network, cascaded H-bridge converter is often adopted in PET(power electronic transformer) to reach the voltage level of high-voltage side. As the DC bus of cascaded H-bridge converter has to be separated, the second harmonic voltage ripple fluctuation that is difficult to filter exists in the DC bus when the input unit power factor is achieved, resulting the use of large capacity DC bus capacitor and the increase of volume in the PET. Based on PET with the cascaded H-bridge rectifier in three-phase high-voltage distribution network, this paper proposed an improved topology, in which multi-active bridge is used to transmit the power in the three-phase suspended DC bus. In the proposed PET topology, voltage fluctuation of the high voltage side DC bus capacitor can be suppressed, and the capacitance of the HVDC bus capacitor can be reduced. In this paper, working principle of the new topology was discussed and control strategy of each conversion stage was given. Simulation was done to demonstrate the feasibility of topology and control strategy. |
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| ISSN: | 2096-5427 |