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Development of Uninterruptible Power Supply with Voltage Sag Restorer Function

순시전압강하 보상 기능을 가지는 무정전전원공급장치의 개발

  • Received : 2014.04.16
  • Accepted : 2014.05.14
  • Published : 2014.06.01

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.

Keywords

Half-bridge inverter;High-efficiency PWM(pulse width modulation);Line-interactive Method;UPS (uninterruptible power supply);Voltage sag compensation

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