Control and Modulation of a Single-Phase AC/DC Converter With Smooth Bidirectional Mode Switching and Symmetrical Decoupling Voltage Compensation

IEEE Transactions on Power Electronics, vol. 37, pp. 3836–3853

Abstract

In this article, a bidirectional single-phase ac/dc converter with active power decoupling (APD) and smooth mode switching is proposed. Power decoupling techniques have been proved efficient in the reduction of bulky dc bus electrolytic capacitors (E-caps) for single-phase low-power level conversion systems. However, it is found that when dealing with transient conditions such as sudden bidirectional switching or steep load changes, the whole system may be vulnerable and unstable under greatly reduced E-caps situation. None of the existing researches carefully examine such dc bus transient characteristics with bidirectionality under decoupling situation. By multiusing the APD cell, the proposed dc bus voltage suppression strategy is capable of both dc bus voltage ripple elimination and load disturbance rejection under transient conditions. Moreover, the proposed controller involves a dead-time compensation to achieve symmetrical power decoupling voltage without additional sensors for decoupling circuit, which ensures the maximum ripple power suppression ability as well as achieves minimum capacitance requirements. Finally, a 1-kW, 110-Vrms, and 50-Hz single-phase ac/dc prototype has been built and evaluated. Theoretical predictions are compared favorably with experimental results.

Authors 8

1. Xiaoqing Wang

   Zhejiang University

   Affiliation as printed

   Department of Applied Electronics, Zhejiang University, Hangzhou, China

2. Min Chen

   Zhejiang University

   Affiliation as printed

   Department of Applied Electronics, Zhejiang University, Hangzhou, China

3. Bodong Li

   Zhejiang University

   Affiliation as printed

   Department of Applied Electronics, Zhejiang University, Hangzhou, China

4. Guannan Zhu

   Zhejiang University

   Affiliation as printed

   Department of Applied Electronics, Zhejiang University, Hangzhou, China

5. Lei Chen

   Zhejiang University

   Affiliation as printed

   Department of Applied Electronics, Zhejiang University, Hangzhou, China

6. Xinnan Sun

   Zhejiang University

   Affiliation as printed

   Department of Applied Electronics, Zhejiang University, Hangzhou, China

7. Dongbo Zhang

   Zhejiang University

   Affiliation as printed

   Department of Applied Electronics, Zhejiang University, Hangzhou, China

8. Jingxin Hu Aachen Institute for Power Generation and Storage Systems (PGS)

   RWTH Aachen University

   Affiliation as printed

   Institute for Power Generation and Storage Systems, E.ON ERC and the FEN Research Campus, RWTH Aachen University, Aachen, Germany