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이진우(Jin-Woo Lee),바이사(BAYASGALAN D),류지수(Ji-Su Ryu) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
This paper suggests a new starting and stopping method appropriate for the sensorless PMSM drive with air bearings. The proposed method based on the sensorless control algorithm of PMSM uses additional d-axis current control to cope with the limitation of the adopted back-emf based sensorless algorithm in the low speed region. The experimental results show that the proposed method drives appropriately the PMSM with air bearings.
A Study on Variable Speed Generation System with Energy Saving Function
Bayasgalan. D,Sang-Ho Lee,Dong-Hwa Han,Young-Jin Lee,Gyu-Ha Choe 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.1
This paper presents development of variable speed generation (VSG) system with energy saving function. The rubber tyred gantry crane (RTGC) requires the power from diesel-engine. Significant fuel savings by reducing the engine speed can be achieved, because all of operation modes except hoisting are required lower power than rated value of engine. When low speed operation output voltage of generator is decrease until acceptable range of motor driver inverters and auxiliary load supplier. According to power demand engine speed is varying from 20 to 60Hz, and voltage is varying between 210Vac and 480Vac. When idle mode or low power operation dc/dc converter operates by constant output voltage control and inverters dc site voltage is compensated by it. This paper proposed 3-phase interleaved boost converter which has the same structure as the commercially available 3-phase inverter and current sharing capability. 400kW interleaved converter is designed and a performance of converter is evaluated through several experiments with a RTGC system. Energy saving VSG system can cut down fuel consumption by 36% and 21.3% at idle and unidirectional load operations.
Study on Li-Battery Charge Control based on DC-Grid
Youngjin Lee,D.H Han,C.H Ban,GyuHa Choe,J.M Eun,Bayasgalan D 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper suggests the Li-Battery fast charge system based on DC link. That is composed of 3phase PWM converter, PV boost converter and isolated full-bridge converter. This paper studies power control scheme of the entire system and how the rapid charging of the battery. The proposed system is supplied the power from not only grid by current control of the 3phase PWM converter but also MPPT(Maximum Power Point Tracking) control of PV system, and rapidly charge the Li-battery by CVCC method (constant voltage/constant current) of the isolated full-bridge converter.