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이우종(Wujong Lee),차한주(Hanju Cha),윤기갑(Kikab Yoon) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 논문에서는 이중여자형 유도발전기(Doubly Fed Induction Generator) 방식의 풍력발전 시스템에 대해 모델링하고 시뮬레이션을 분석한다. 기본적인 전류제어와 전압제어를 통해 계통과 연결하여 발전할 수 있도록 모델링 하였다. 실제 사용되고 있는 2㎿급 풍력발전 시스템의 축소 모델인 200㎾급 MG-Set를 제작하여 구동시켰다.
불평형 및 비선형부하 시 전력품질 향상을 위한 독립형 인버터의 전압제어 기법
이우종(Wujong Lee),조종민(Jongmin Jo),차한주(Hanju Cha) 대한전기학회 2016 전기학회논문지 Vol.65 No.4
This paper proposed the voltage control of stand-alone inverter for power quality improvement under unbalanced and non-linear load. The 3-phase DC-AC inverter controls CVCF(Constant Voltage Constant Frequency) and selective harmonic eliminate method in stand-alone mode by PR controller, and the stand-lone inverter supplies stable sinusoidal voltage to balanced, unbalanced and non-linear loads. The total harmonic distortion(THD) of line-to-line load voltage(VLL) is 1.2% in the balanced load. THD of VLL is reduced from 5.2% to 1.4% and 6.7% to 3.5%, respectively unbalanced and non-linear load. The stand-alone inverter can be supplies sinusoidal balanced voltage to unbalanced load because the voltage unbalanced factor(VUF) of VLL is reduced from 5.2% to 1.4% in the unbalanced load. Feasibility of control method for a stand-alone inverter will be verified through 30kW stand-alone inverter system.
이우종(Wujong Lee),이종경(Jongkyung Lee),김영록(Youngrok Kim),차한주(Hanju Cha) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
본 논문에서는 5㎾ 계통연계형 배터리충전기 시스템의 해석 및 실험에 대한 연구이다. 배터리충전기는 3상 인터리브드 DC-DC 컨버터와 계통연계형 인버터로 구성된다. 인터리빙 방식을 이용해 컨버터의 인덕터의 크기를 줄이고, 배터리 양단에 커패시터를 연결하여 배터리 전류리플을 감소시킨다. 실험 결과는 본 논문에 서술하였다.
이우종(Wujong Lee),이학주(Hak Ju Lee),차한주(Hanju Chag) 대한전기학회 2014 전기학회논문지 Vol.63 No.10
This paper researches a modeling and experiment of 50kW diesel generator in grid-connected mode. The output of diesel generator can be calculated by the phase difference between voltage and current as well as the diesel generator parameter such as mutual impedance, field current and rotor angle. Considering the different d-q frame impedance, the output of diesel generator is analyzed for equation and verified by simulation. The diesel generator modeled by considering the time delay for actuator, diesel engine and exciter. The controller of diesel generator is divided into governor and exciter. The governor consists of speed controller and active power controller, where speed controller maintains frequency as 60Hz and active power tracks active power reference. On the other hand, the exciter consists of voltage controller and reactive power controller, where voltage controller controls 380VLL and reactive power is controlled as zero. When the active power reference is changed as 0.1pu in the grid connected mode, the active power takes 10 seconds to reach the steady state and the reactive power is maintains as zero. The 50kW diesel generator is tested and experiment results are well matched with the simulation results.