순시전압강하 보상 기능을 가지는 무정전전원공급장치의 개발

Abstract

In this paper, UPS, with a built-in instantaneous sag drop compensation features, was developed to improveperformance. The improved UPS, using instantaneous moving average method, compensates by quickly measuring thevoltage and series inverter of half-bridge type, using line-interactive method that links with the voltage of the batteryand power source, was developed. In addition, by developing a parallel inverter that uses a high-efficiency PWMswitching method, overall UPS system was enhanced. To verify the performance of the proposed algorithm, single-phase5[kVA] UPS systems were designed and the experimental system was constructed. The low-cost type of Cortex-M3module CPU STM32F103R8T6 (32[bit]) is attached and the switching time of mode transfer was set within 4 [ms]. THDof the linear load operates in less than 3[%], and the stability of the output voltage operates in approximately ±2[%]range. The superior performance of the operations was confirmed with the system set as above.