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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
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(Hanju Cha),강영주(Youngju Kang) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문은 태양광 PCS 발전 시스템을 위한 3㎾ 3상 인터리브드 부스트 컨버터의 동작과 제작을 위한 기반사항에 대해 서술하였으며, 컨버터의 희망 출력전압을 얻기 위한 제어부의 구성과 비례전류 제어를 사용한 동작알고리즘을 포함해 실제 PCB 제작을 위해 선정한 부품 및 배치의 구성에 대해 다루었다. 제어부는 아날로그가 아닌 디지털 제어를 채택하여 컨버터 각 부의 센서를 통해 전류, 전압 값을 취득하고, 이를 DSP에서 처리하여, 기준값과 피드백 값과의 오차 보상을 위한 PWM 신호를 생성, 컨버터를 동작시킨다.
3상 매트릭스 컨버터에 사용되는 옵셋전압 PWM방법과 V<SUB>max</SUB>-V<SUB>mid</SUB> PWM 방법의 비교분석
車翰周(Hanju Cha),金宇中(Woojung Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.2
In this paper, comparative analysis of offset voltage PWM method and Vmax-Vmid PWM method for three-phase matrix converter is addressed by using a simple analytical and graphical method. Offset voltage PWM method calculates PWM patterns in terms of offset voltage and variable slope of carrier, and it simplifies matrix converter modulation algorithm significantly. Vmax-Vmid PWM method generates patterns by using two phases and maintaining a remaining phase to base phase, and it is implemented in the industrial products. The most important performance criterion of modulation method is a magnitude of current ripples and it is analytically modelled. The graphical illustration of theses complex multi variable functions make per-carrier cycle and per fundamental cycle behavior of two PWM methods understood. Two modulation methods are analysed with the analytical formulas and graphics, and the analysis shows offset voltage PWM method is superior to Vmax-Vmid PWM method with respect to input current ripples and output voltage ripples.
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.
전류형 MPPT를 이용한 3 ㎾ 태양광 인버터 시스템 제어기 설계 및 구현
車翰周(Hanju Cha),李相回(Sanghoey Lee),金在彦(Jae-Eon Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.10
In this paper, a new current based maximum power point tracking (CMPPT) method is proposed for a single phase photovoltaic power conditioning system and the current based MPPT modifies incremental conductance method. The current based MPPT method makes the entire control structure of the power conditioning system simple and uses an inherent current source characteristic of solar cell array. In addition, digital phase locked loop using an all pass filter is introduced to detect phase of grid voltage as well as peak voltage. Controllers about dc/dc boost converter, de-link voltage, dc/ac inverter is designed for a coordinated operation. Furthermore, PI current control using a pseudo synchronous d-q transformation is employed for grid current control with unity power factor. 3㎾ prototype photovoltaic power conditioning system is built and its experimental results are given to verify the effectiveness of the proposed control schemes.