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http://dx.doi.org/10.5370/KIEE.2016.65.4.567

Voltage Control of Stand-Alone Inverter for Power Quality Improvement Under Unbalanced and Non-linear Load  

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.)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.65, no.4, 2016 , pp. 567-575 More about this Journal
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.
Keywords
Proportional-resonant control; Resonant control; Stand-alone mode; Unbalanced load; Non-linear load; Power quality;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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