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공진모델을 이용한 3상 병렬형 능동전력필터의 데드비트제어
朴志浩(Jee-Ho Park),金?完(Dong-Wan Kim) 대한전기학회 2007 전기학회논문지 P Vol.56 No.3
In this paper, a new simple control method for active power filter which can realized the complete compensation of the harmonic currents is proposed. In the proposed scheme, a compensating current reference generator employing resonance model implemented by a DSP(Digital Signal Processor) is introduced. Deadbeat control is employed to control the active power filter. The switching pulse width based SVM(Space Vector Modulation) is adopted so that the current of active power filter is been exactly equal to its reference at the next sampling instant. To compensate the computation delay of digital controller, the prediction of current is achieved by the current observer with deadbeat response.
무성방전 오조나이저의 성능개선을 위한 2중 디지털 제어기의 설계
朴志浩(Jee-Ho Park),金?完(Dong-Wan Kim),禹盛薰(Sung-Hoon Woo),盧仁培(In-Bae Roh),禹靖仁(Jung-In Woo) 대한전기학회 2006 전기학회논문지 P Vol.55 No.1
In this paper, a control method of ozone generator for a tiny deodorizer is proposed, and also a cooling technique is described which is cooling down the flowing air gap into a silent discharger to 2[℃] to generate ozone of high density and diffusing power. As the digital control system for this method, a double feedback loop is designed which detects the voltage and current of equivalent capacitor of the discharger and compensates for the poor power waveform caused by the noise at high discharging frequency. During the plant modeling of this system, computing time factor is considered as a unique parameter of the power system to improve the respond characteristics with regard to fluctuating load and to replenish the computing time delay of the controller. Through the experiment, sinusoidal input current for discharger can be acquired and all the effectiveness of this accurate control system over unstable ozone discharger are proved.
무손실 공진기를 이용한 능동전력필터의 Deadbeat제어
박지호(Jee-Ho. Park),노태균(Tae-Kyun. Roh),김춘삼(Choon-Sam. Kim),안인모(In-Mo. Ahn),우정인(Jung-In. Woo) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In this paper, a new simple control method for active power filter which can realized the complete compensation of the harmonic currents is proposed In the proposed scheme, a compensating current reference generator employing lossless resonato implemented by a DSP(Digital Signal Processor) is introduced. Deadbeat control is employed to contro the active power filter The switching pulse width based SVM(Space Vector Modulation) is adopted so that the current of acttve power filter is been exactly equal to its reference at the next sampling Instant To compensate the computation delay of digital controller, the prediction of current is achieved by the current observer with deadbeat response
소화슬러지의 비저항계수(SRF)와 모세관흡입시간(CST)의 상호관계식 유도 및 비교
김지형(Khim, Jee-Hyeong),나승민(Na, Seung-Min),박지호(Park, Ji-Ho),김영욱(Kim, Young-Uk) 한국산학기술학회 2007 한국산학기술학회논문지 Vol.8 No.4
CST와 SRF는 슬러지 탈수효율 인자로 가장 널리 사용되고 있다. 이러한 CST와 SRF는 각각의 분석특정의 장 · 단점으로 인해 실험방법 및 결과 해석시, 슬러지 탈수의 최적조건을 찾아 예측하는데 어려움이 있다. 따라서 본 연구는 탈수성 지표로 이용되는 CST와 SRF의 이론식 가운데 CST와 SRF의 상호관계식을 유도하여 각각의 실측값과 예측값을 비교한 후 비교적 측정이 간편한 CST시험만으로도 탈수최적조건을 도출할 수 있는 이론식을 검토하였다. Capillary Suction Time(CST) and Specific Resistance to Filtration(SRF) were commonly used to evaluate the sludge dewatering behaviors. A coupled equation was developed through the mathematical theory which represented both CST and SRF as the physical filterability of the ultrasonically treated sludge. The model for coupling CST and SRF includes both equipment variables and variables related to sludge characteristics, and verified with the results from experiments. The results of the theoretical and experimental study showed that a good correlation relationship among dewaterability indices.
우정인,우성훈,노인배,박지호,김동완,Woo, Jung-In,Woo, Sung-Hoon,Roh, In-Bae,Park, Jee-Ho,Kim, Dong-Wan 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.7
본 논문에서는 오존발생장치의 전원측 파형에 포함되는 고주파수의 노이즈를 제거하고, 디지털 궤환 제어에 의해 오존 출력을 제어하기 위하여 전원장치의 출력측 LC 필터와 방전관 용량으로부터 커패시터 전압과 전류를 검출하여 2중의 제어루프를 설계하였다. 디지털 제어기의 연산지연시간을 보상하기 위하여 연산지연시간을 전원장치 플랜트의 고유한 파라미터로 가정하고, 플랜트 모델에 포함시켜 모델링 하였다. 오존발생장치의 부하변동에 따르는 과도상태 응답특성을 개선하고, 파라미터 변동에 강인한 특성을 얻기 위하여 내부 전류 모델 제어기를 제안하였다. 또한 오존발생장치용 전원장치에서 영 오차의 정상 상태를 얻기 위하여 외부 전압 제어루프를 구성하여 비례 제어기와 공진 제어기를 병렬로 연결한 비례-공진 전압제어기를 제안하였다. In this paper, a constant output power supply system for ozonizer is proposed to remove the noise of ozonizer and control the output of ozonizer using feedback control. The proposed system is based on the rouble control loop such as the outer voltage control loop and inner current control loop. In the proposed system overshoots and oscillations due to the computation time-delay are compensated by explicit incorporation of the time-delay in the current control loop transfer function. The inner current control loop is adopted by an internal model controller. The internal model controller is designed to a second order deadbeat reference-to-output response which means that its response reaches the reference in two sampling time including computational time-delays. The outer voltage control loop employing P-Resonance controller is proposed. The resonance controller has an infinite gain at resonant frequency, and the resonant frequency is set to the fundamental frequency of the reference voltage in this paper. Thus the outer voltage control loop causes no steady state error as regard to both magnitude and phase. The effectiveness of the proposed control system has been verified by the experimental results.