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A Bidirectional Single-Stage DC/AC Converter for Grid Connected Energy Storage Systems
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  • Journal title : Journal of Power Electronics
  • Volume 15, Issue 4,  2015, pp.1026-1034
  • Publisher : The Korean Institute of Power Electronics
  • DOI : 10.6113/JPE.2015.15.4.1026
 Title & Authors
A Bidirectional Single-Stage DC/AC Converter for Grid Connected Energy Storage Systems
Chen, Jianliang; Liao, Xiaozhong; Sha, Deshang;
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In this paper, a unified control strategy using the current space vector modulation (CSVM) technique is proposed and applied to a bidirectional three-phase DC/AC converter. The operation of the converter changes with the direction of the power flow. In the charging mode, it works as a buck type rectifier; and during the discharging mode, it operates as a boost type inverter, which makes it suitable as an interface between high voltage AC grids and low voltage energy storage devices. This topology has the following advantages: high conversion efficiency, high power factor at the grid side, tight control of the charging current and fast transition between the charging and discharging modes. The operating principle of the mode analysis, the gate signal generation, the general control strategy and the transition from a constant current (CC) to a constant voltage (CV) in the charging mode are discussed. The proposed control strategy has been validated by simulations and experimental results obtained with a 1kW laboratory prototype using supercapacitors as an energy storage device.
Bidirectional power flow;Current source converter;Energy storage system;
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