| Title |
Development of Uninterruptible Power Supply with Voltage Sag Restorer Function |
| Authors |
박종찬(Park, Jong-Chan) ; 손진근(Shon, Jin-Geun) |
| DOI |
https://doi.org/10.5370/KIEEP.2014.63.2.095 |
| Keywords |
Half-bridge inverter ; High-efficiency PWM(pulse width modulation) ; Line-interactive Method ; UPS (uninterruptible power supply) ; Voltage sag compensation |
| Abstract |
In this paper, UPS, with a built-in instantaneous sag drop compensation features, was developed to improve performance. The improved UPS, using instantaneous moving average method, compensates by quickly measuring the voltage and series inverter of half-bridge type, using line-interactive method that links with the voltage of the battery and power source, was developed. In addition, by developing a parallel inverter that uses a high-efficiency PWM switching method, overall UPS system was enhanced. To verify the performance of the proposed algorithm, single-phase 5[kVA] UPS systems were designed and the experimental system was constructed. The low-cost type of Cortex-M3 module CPU STM32F103R8T6 (32[bit]) is attached and the switching time of mode transfer was set within 4 [ms]. THD of the linear load operates in less than 3[%], and the stability of the output voltage operates in approximately {\pm}2[%] range. The superior performance of the operations was confirmed with the system set as above. |