The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Voltage Control of Stand-Alone Inverter for Power Quality Improvement Under Unbalanced and Non-linear Load

불평형 및 비선형부하 시 전력품질 향상을 위한 독립형 인버터의 전압제어 기법

  • Lee, Wujong (Hanwha Corporation R&D Center) ;
  • Jo, Jongmin (Dept. of Electrical Engineering, Chungnam National Univ.) ;
  • Cha, Hanju (Dept. of Electrical Engineering, Chungnam National Univ.)
  • Received : 2015.09.22
  • Accepted : 2016.02.23
  • Published : 2016.04.01
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Abstract

This paper proposed the voltage control of stand-alone inverter for power quality improvement under unbalanced and non-linear load. The 3-phase DC-AC inverter controls CVCF(Constant Voltage Constant Frequency) and selective harmonic eliminate method in stand-alone mode by PR controller, and the stand-lone inverter supplies stable sinusoidal voltage to balanced, unbalanced and non-linear loads. The total harmonic distortion(THD) of line-to-line load voltage($V_{LL}$) is 1.2% in the balanced load. THD of $V_{LL}$ is reduced from 5.2% to 1.4% and 6.7% to 3.5%, respectively unbalanced and non-linear load. The stand-alone inverter can be supplies sinusoidal balanced voltage to unbalanced load because the voltage unbalanced factor(VUF) of $V_{LL}$ is reduced from 5.2% to 1.4% in the unbalanced load. Feasibility of control method for a stand-alone inverter will be verified through 30kW stand-alone inverter system.

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References

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