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단일동조 수동고조파필터 설계시의 동조계수() 및 양호도()값 연구
차한주,조영식 대한전기학회 2010 전기학회논문지 P Vol.59 No.1
This paper presents how to decide on tuning factor() and quality factor() values in design of single-tuned passive harmonic filters. Tuning factor() and quality factor() values have to consider before decision on circuit parameters of passive filters. A Study on these two value has not been scarcely performed and only experienced values has been used in passive harmonic filter design by far. As a experienced value, in cases of 5th and 7th filter, tuning factor() is about 0.94 and 0.96 respectively and quality factor() is, in all cases of, 50. If Single-tuned passive harmonic filter will be off-tuned, performance of filter will be decreased steeply and occur to parallel resonance between system reactance and filter capacitance. Therefore During the operation, In order not to off-tuning, Filter must be tuned at former order than actual tuning order. This is the same that total impedance of filter must have a reactive impedance. In this paper, Tuning factor() is decided via example of real system and using the bode-plot and then performance of filters confirmed by filter current absorbtion rate. And Quality factor() decided using the bode plot in example system and then performance of filters confirmed by filter current absorbtion rate also, which makes a calculated filter parameters to satisfy IEEE-519 distortion limits. Finally, Performance of the designed passive harmonic filter using the tuning factor() and quality factor() values, decided in this paper is verified by experiment and shows that 5th, 7th, 9th, 11th and 13th current harmonic distortions are decreased within IEEE-519 distortion limits, respectively.
차한주,권오극,최수현,조현식 대한전기학회 2022 전기학회논문지 Vol.71 No.8
Renewable energy has advantages in environmental aspects such as greenhouse gas reduction and fine dust reduction, but the stability of the power system is lowered due to the variability & uncertainty of renewable energy sources. Therefore, it is important to predict the amount of generation of renewable energy, which can contribute to system stabilization. In order to predict the power generation of floating photovoltaic(FPV), the generation amount of 500㎾ FPV and meteorological data were used to predict the power generation through the Recurrent Neural Network(RNN). To perform appropriate prediction, identifying the correlation between variables, removing multicollinearity, handling missing values properly are performed and the amount of power generation is predicted through appropriate RNN. In addition, it is analyzed how the influence of wind affects the amount of power generation of FPV
차한주(Hanju Cha),강영주(Yeongju Kang),안태풍(Taepung Ahn) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
부스트 컨버터를 사용해 낮은 직류 전압을 보다 높은 전압으로 승압시킴에 있어 기존 단상이 아닌 다상의 인터리브드 방식의 컨버터를 채택하였다. 인터리브 방식이 갖는 이론적 장점은 전류 경로의 확장으로 그 흐름이 배분되고, 이로 인해 전류 리플크기의 저감과 더불어 컨버터 제작과정에서 부품의 용량 및 부피를 감소시킬 수 있는 이점을 얻는다. 본 논문에서는 인터리브 방식의 채택으로 얻을 수 있는 장점을 실험을 통해 입증, 3상 인터리브 방식 컨버터의 우수성을 보인다.
직접전력변환 방식을 이용한 전압 sag/swell 보상기의 구현
차한주(Han-ju Cha),이대동(Dae-dong Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this paper, a new single phase voltage sag/swell compensator using direct power conversion is introduced. A new compensator consists of input/output filter, series transformer and direct ac-ac converter, which is a single-phase back-to-back PWM converter without de-link capacitors. Advantages of the proposed compensator include: simple power circuit by eliminating de-link electrolytic capacitors and thereby, improved reliability and increased life time of the entire compensator; simple PWM strategy to compensate voltage sag/swell at the same time and reduced switching losses in the ac-ac converter. Further, the proposed scheme is able to adopt simple switch commutation method without requiring complex four-step commutation method commonly required in the direct power conversion. Simulation results are shown to demonstrate the advantages of the new compensator and PWM strategy.
차한주(Hanju Cha),김우중(Woojung Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
본 논문에서는 매트릭스 컨버터의 입력 필터 설계를 하고, 시뮬레이션하여 타당성을 검증하고 분석한다. 매트릭스 컨버터는 18개의 양방향 스위치로 구성되어 있으며, 출력 전압을 합성하기 위해 각각의 스위치가 빠르게 온-오프 한다. 이러한 스위칭 과정에서 고차 고조파가 발생하고, 이 고조파는 매트릭스 컨버터 주위에 연결된 각종 기기에 영향을 미친다. 따라서 고차 고조파를 줄이기 위해 계통과 매트릭스 컨버터 사이에 입력 필터를 설치하여 이러한 영향을 줄여야 한다. 입력 필터의 L과 C, 그리고 공진 주파수 근처의 값을 줄이기 위한 댐핑 저항 값을 계산하는 방법을 소개하고, 타당성을 검증한다.
농동 클램프형 전류형 단상 풀브리지 DC-DC 컨버터의 동작 해석
차한주(Hanju Cha),최순호(Soonho Choi),안치형(Chihyung Ahn) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
Isolated current fed full-bridge converter with active clamp is analyzed in this paper. An active clamp branch is used for limiting the voltage overshoot in the bridge switches and rectifier diodes. Zero voltage switching(ZVS) is also realized by using the energy stored In the transformer leakage inductance. To analyze the converter, 6 modes of operation are introduced and investigated. For each of the modes, voltage and current equations are derived together with corresponding equivalent circuits. 200W prototype de-de converter is assembled and verifies the effectiveness of the analysis and simulation.