Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Harmonic compensated individual-phase control of four-leg inverters for microgrid applications

  • Jin‑Sung Lee (Research and Development Center, Intech-FA Co., Ltd) ;
  • Sang‑Hyeon Lee (Department of Electrical and Computer Engineering, Ajou University) ;
  • In‑Ho Lee (Department of Electrical and Computer Engineering, Ajou University) ;
  • Sung‑Nam Ju (Research and Development Center, Intech-FA Co., Ltd) ;
  • Kyo‑Beum Lee (Department of Electrical and Computer Engineering, Ajou University)
  • Received : 2023.06.16
  • Accepted : 2023.08.31
  • Published : 2023.11.20
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Abstract

In this paper, harmonic compensated individual-phase voltage control of four-leg inverters is proposed for microgrid applications. Individual-phase control, which is one of the promising voltage control methods of four-leg inverters, ensures robustness for high load unbalance rates. However, the odd harmonics generated by nonlinear loads and dead time deteriorate the quality of load voltages under single-phase control. The proposed method compensates for the odd harmonics included in the load voltages to improve the output power quality. In the proposed method, band-pass and all-pass filters are used to generate the virtual components for the individual-phase control. Additionally, the harmonics are compensated in the synchronous reference frame using a resonant controller, while the fundamental components are controlled by proportional-integral controllers. With the proposed method, the total harmonic distortion of the load voltages is maintained at a low level under unbalanced and nonlinear load conditions. The effectiveness of the proposed method is demonstrated through simulation and experimental results.

Keywords

Acknowledgement

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20206910100160).

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