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납 축전지 병렬운전시 발생하는 전류 불평형 현상분석 및 대책
반한식(Han-sik Ban),곽철훈(Cheol-hun Kwak),최규하(Gyu-ha Choe),목형수(Hyung-soo Mok) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A battery is the device that transforms the chemical energy into the direct-current electrical energy directly without a mechanical process, Unit cells are connected m series to obtain the necessary voltage, while being connected m parallel to organize capacity for load current and to decrease the internal resistance for corresponding the sudden shift of the load current. The circular-current, however, could be occurred when the system IS driven in parallel. As a result. the new batteries are heated by over-charge and discharge, and the over charge current makes to increase the rust of the positive grid and consequently the shortened life of the new battens would be shown, In this paper, the internal resistance of each set will be constant and the current of charge and discharge will be balanced, through inserting the resistance into the system by way of calculation of the changed amount of internal resistance.
정류기 부하와 무정전전원장치 사이에 발생되는 Current Harmonic 저감
곽철훈(Cheol-hun Kwak),반한식(Han-sik Ban),최규하(Gyu-Ha Choe),목형수(Hyung-soo Mok) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
The main purpose of the UPS is to supply independent and stable power to connected equipment In installing and operating the UPS system, songle module, three phase UPS in more benefit than multi module, songle phase UPS In the point of volume and cost However, when supplying Rectifier with output power from three phase UPS, by connecting auto-transformer, occurred harmonic and ripple current makes output filter damaged and leads to nonlinear current coasted by unbalance load, Therefor, in this paper the aim of concentring compound-wound transformer and harmonic filter is supplying liner current by reducing harmonic and ripple current and improving unbalance In voltage and distortion in current wave,