Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Design and Control of a Bidirectional Power Conversion System with 3-level T-type Inverter for Energy Storage Systems

  • Sung, Won-Yong (Department of Electrical and Computer Engineering, Sungkyunkwan University) ;
  • Ahn, Hyo Min (Department of Electrical and Computer Engineering, Sungkyunkwan University) ;
  • Oh, Chang-Yeol (Power Conversion & Control Research Center, HVDC Research Division, Korea Electrotechnology Research Institute (KERI)) ;
  • Lee, Byoung Kuk (Department of Electrical and Computer Engineering, Sungkyunkwan University)
  • Received : 2017.09.18
  • Accepted : 2017.10.20
  • Published : 2018.01.01
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Abstract

In this paper, the design process and the control method of the power conversion system (PCS) that consists of a bidirectional DC-DC converter and a 3-level T-type inverter for an energy storage system is presented. Especially the design method of the output LCL filter for a 3-lvel T-type inverter without complex mathematical process are proposed. The validity of the control method and design process in this paper are verified through simulation and experimental analysis.

Keywords

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Fig. 1. Configuration of PCS for ESS

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Fig. 2. Configuration of PCS controller

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Fig. 3. Line-to-line voltages of the 3-level T-type inverter

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Fig. 4. Phase voltages of the 3-level T-type inverter

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Fig. 5. Equivalent single-phase short circuit model in high-frequency band

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Fig. 6. Simulation results of PCS with designed LCL filter

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Fig. 7. Simulation results of LCL filter currents

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Fig. 8. 5kW prototype of the PCS with 3-level T-typeinverter and experimental environment

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Fig. 9. Experimental results of the 3-level T-type inverterin discharging mode

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Fig. 10. Experimental results of the 3-level T-type inverterin charging mode

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Fig. 11. Experimental results of the PCS

Table 1. Control targets of the PCS

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Table 2. Specification of the PCS

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Table 3. Design result of the LCL filter

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References

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