전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제20권2호
  • /
  • Pages.115-121
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  • 2015
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  • 1229-2214(pISSN)
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  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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불평형부하 시 독립형 인버터의 데드타임 보상기법

Dead Time Compensation of Stand-alone Inverter Under Unbalanced Load

  • Jeong, Jinyong (Dept. of Electrical Engineering, Chungnam National Univ.) ;
  • Jo, Jongmin (Dept. of Electrical Engineering, Chungnam National Univ.) ;
  • Lee, Junwon (Dept. of Electrical Engineering, Chungnam National Univ.) ;
  • Chae, Woo-Kyu (Korea Electric Power Research Institute, KEPCO) ;
  • Cha, Hanju (Dept. of Electrical Engineering, Chungnam National University)
  • 투고 : 2014.08.28
  • 심사 : 2014.11.22
  • 발행 : 2015.04.20
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초록

Stand-alone inverter supplies constant voltage to loads. However, when a three-phase stand-alone inverter supplies unbalanced load, the generated output voltages also become unbalanced. The nonlinear characteristics of inverter dead time cause a more serious distortion in the output voltage. With unbalanced load, voltage distortion caused by dead time differs from voltage distortion under balanced load. Phase voltages in the stationary reference frame include unbalanced odd harmonics and then, d-q axis voltages in the synchronous reference frame have even harmonics with different magnitude, which are mitigated by the proposed multiple resonant controller. This study analyzes the voltage distortion caused by unbalanced load and dead time, and proposes a novel dead time compensation method. The proposed control method is tested on a 10-kW stand-alone inverter system, and shows that total harmonic distortion (THD) is reduced to 1.5% from 4.3%.

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참고문헌

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