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| Analysis and Design of an Active Capacitor Converter |
| Wei Chuanxiang, Luo Quanming, Zu Aqian, Zhou Luowei |
| State Key Laboratory of Power Transmission Equipment & System Security and New TechnologyChongqing University Chongqing 400044 China |
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Abstract Single-phase power converter usually adopts large-capacity electrolytic capacitor because of the instantaneous power imbalance between the AC side and the DC side. The electrolytic capacitor has inherent defects such as short service life and poor thermal stability, which affects the life and reliability of the converter. Therefore, an active capacitor converter is proposed in this paper. By controlling the port voltage and port current to meet the differential relationship of a capacitor, the active capacitor is replaced by the original electrolytic capacitor. Thereby, the inherent defects of the electrolytic capacitor can be overcome. Meanwhile, the service life of the single-phase power converter can be prolonged and the thermal stability can be improved. Firstly, the detailed calculation method of the bus capacitor is carried out. Then, the working principle and its parameter design method of the active capacitor converter are expounded. Finally, the simulation and an experimental prototype verify the active capacitor converter, which show the correction of the theory analysis and parameter design.
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Received: 24 April 2018
Published: 28 June 2019
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2019, Vol. 34 
