| Title |
Voltage Control of Stand-Alone Inverter for Power Quality Improvement Under Unbalanced and Non-linear Load |
| Authors |
이우종(Lee, Wujong) ; 조종민(Jo, Jongmin) ; 차한주(Cha, Hanju) |
| DOI |
https://doi.org/10.5370/KIEE.2016.65.4.567 |
| Keywords |
Proportional-resonant control ; Resonant control ; Stand-alone mode ; Unbalanced load ; Non-linear load ; Power quality |
| 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. |