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  • Title/Summary/Keyword: Current tracking

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A Utility Interactive Photovoltaic Generation System using PWM Chopper and Current Source Inverter (PWM 쵸퍼와 전류형 인버터를 이용한 계통연계형 태양광발전시스템)

  • 이승환;성낙규;오봉환;검성남;이훈구;김용주;한경희
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.4
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    • pp.323-329
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    • 1998
  • In this paper, we compose of the utility interactive photovoltaic(PV) generation system with a PWM stepdown chopper and a current source inverter. The stepdown chopper is controlled by the several gate pulses (twice frequency of utility voltage, square pulse and without the chopper) of chopper part to reduce pulsation of DC current and size of DC reactor. PV current only is measured for maximum power point tracking without any influence on the variation of insolation and temperature. Therefore, we can control modulation factor of the chopper to operate at maximum power point of solar cell. And, the utility interactive photovoltaic generation system supplies an AC power to the load and the utility power system.

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A Novel MPPT using Single Sensor for Photovoltaic Module Integrated Converter (단일 센서를 사용한 태양광 Module Integrated Converter의 최대전력점 추종 기법)

  • Ji, Young-Hyok;Kim, Young-Ho;Jung, Doo-Yong;Lee, Su-Won;Won, Chung-Yuen
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.10a
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    • pp.263-266
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    • 2009
  • In the photovoltaic applications, MPPT(maximum power point tracking) method is essential due to the non-lineality of photovoltaic output characteristics. To ensure stable tracking response, two sensors are required in conventional popular MPPTs. In modularized PV system as an AC module system, the cost of a sensor can have an effect on entire system cost because a power conditioning device is connected in a PV module. Because only a current sensor is required for proposed MPPT, it is helpful in the cost reduction point of view. In this paper, a novel MPPT using current sensor is proposed In the proposed MPPT, the voltage is derived from sensed current value. The proposed method is verified by simulation results.

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An Improved Battery Charging Algorithm for PV Battery Chargers (태양광 배터리 충전기를 위한 개선된 충전 알고리즘)

  • Kim, Jung-Hyun;Jou, Sung-Tak;Lee, Kyo-Beum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.6
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    • pp.507-514
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    • 2013
  • In this paper, the proposed charging algorithm is converted from the charging mode to compensate the transient state in the solar battery charging system. The maximum power point tracking (MPPT) control methods and the various charging algorithms for the optimal battery charging are reviewed. The proposed algorithm has excellent transient characteristics compare to the previous algorithm by adding the optimal control method to compensate the transient state when the charging mode switches from the constant current mode to the constant voltage mode based on the conventional constant-current constant-voltage (CC-CV) charging algorithm. The effectiveness of the proposed method has been verified by simulations and experimental results.

Drogue Tracking in the Coastal Waters of Ulreungdo-Tokto in Summer (측류판 표류실험에 의한 하계 울릉도독도 근해의 해수유동 특성)

  • CHANG Sun-duck;KIM Jong-Kyu
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.27 no.5
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    • pp.583-593
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    • 1994
  • The East Korean Warm Current is known as an anticyclonic circulation in the Ulreung Basin in the southwestern East Sea of Korea. This circulation was approximately estimated by dynamic methods based on the oceanographic observation and remote sensing data. In this study, the existence of circulation in the anticyclonic region of East Korean Warm Current(Tsushima current) in early summer was directly measured by drogue tracking using a global positioning system. At the same time, the velocity was calculated by dynamic method and compared using data collected by remote sensing. As results, these values are shown to be nearly the same, and an anticyclonic circulation was found around Ulreungdo-Tokto. The maximum northward and southward flow speed was deduced to be around 0.6 and one knot, respectively.

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Power Density Maximization of the Brushless DC Generator by Controlling the Optimal Current Waveform (최적 전류파형제어를 통한 브러시리스 DC 발전기의 출력밀도 최대화에 관한 연구)

  • 이형우
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.7
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    • pp.430-436
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    • 2004
  • This paper presents an advanced control technique for power density maximization of the Brushless DC (BLDC) generator by using the linear tracking method. In a generator of given rating, the weight and size of the system affect the fuel consumption directly. Therefore, power density is one of the most important issues in a stand-alone generator. BLDC generator has high power density in the machine point of view and additional increases of power density by control means can be expected. Conventional rectification methods cannot achieve the maximum power possible because of hon-optimal current waveforms. The optimal current waveform to maximize power density and minimize machine size and weight in a nonsinusoidal power supply system has been derived, incorporated in a control system, and verified by simulation and experimental work. A new simple algebraic method has been proposed to accomplish the proposed control without an FFT which is time consuming and complicated.

Study on Development of High Speed Rotating Arc Sensor and Its Application (고속 회전 아크센서 개발 및 그 응용에 관한 연구)

  • Jeong, Sang-Kwun;Lee, Gun-You;Lee, Won-Ki;Kim, Sang-Bong
    • Proceedings of the KSME Conference
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    • 2001.06b
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    • pp.700-705
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    • 2001
  • The paper presents a seam tracking controller of high speed rotating arc sensor developed by microprocessor based system. The seam tracking algorithm is based on the average current value at each interval region of four phase points on one rotating cycle. To remove the noise effect for the measured current, the area during one rotating cycle is separated into four regions of front, rear, left and right. The average values at each region are calculated, using the regional current values and a low pass filter incorporating the moving average and exponential smoothing methods is adopted.

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A Study on Development of High Speed Rotating Arc Sensor and Its Application (고속회전 아크센서 개발 및 그 응용에 관한 연구)

  • Lee, G.Y.;Lee, W.K.;Jeong, S.K.;Kim, S.B.;Oh, M.S.
    • Journal of Power System Engineering
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    • v.6 no.4
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    • pp.43-48
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    • 2002
  • This paper presents a seam tracking controller of high speed rotating arc sensor developed by microprocessor based system. The seam tracking algorithm is based on the average current value at each interval region of four phase points on one rotating cycle. To remove the noise effect for the measured current, the area during one rotating cycle is separated into four regions of front, rear, left and right. The average values at each region are calculated, using the regional current values and a low pass filter incorporating the moving average and exponential smoothing methods is adopted. The effectiveness is proven through the experimental results for several kinds of welding condition.

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Detection of Indication of Electric Accident in Simulated Electric Equipments Using Standard Deviation and Probability Distribution (표준편차와 확률분포를 이용한 모의전기설비에서 사고징후 검출)

  • Jee, Seung-Wook;Ok, Kyung-Gea;Kim, Shi-Kuk;Lee, Chun-Ha
    • Fire Science and Engineering
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    • v.23 no.3
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    • pp.11-16
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    • 2009
  • This paper describes a detecting method for indication of an electric accident in electric equipments. For that, loads of electric equipment is consisted of incandescent lamps. And the electric accident is simulated a tracking test apparatus according to KS C IEC (Korea Standard C International Electrostatic Commission) 60112 at some part of the simulation of the electric equipment. Simulated electric accident is occurred from static states through discharge in progress, carbon formation to tracking breakdown. The total current of electric equipments is measured and analyzed for detecting of indication of the electric accident using a current monitor. For the result, as an electric accident processed, as a current pulse is bigger and a ratio of appearance also increases at certain part of current waveforms. And standard deviation and probability distribution for certain part of current waveforms show remarkably different pattern in each step of electric accident which is irrespective of amount of load.

Design and Implementation of Photovoltaic Power Conditioning System using a Current-based Maximum Power Point Tracking

  • Lee, Sang-Hoey;Kim, Jae-Eon;Cha, Han-Ju
    • Journal of Electrical Engineering and Technology
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    • v.5 no.4
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    • pp.606-613
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    • 2010
  • This paper proposes a novel current-based maximum power point tracking (CMPPT) method for a single-phase photovoltaic power conditioning system (PV PCS) by using a modified incremental conductance method. The CMPPT method simplifies the entire control structure of the power conditioning system and uses an inherent current source characteristic of solar cell arrays. Therefore, it exhibits robust and fast response under a rapidly changing environmental condition. Digital phase locked loop technique using an all-pass filter is also introduced to detect the phase of grid voltage, as well as the peak voltage. Controllers of dc/dc boost converter, dc-link voltage, and dc/ac inverter are designed for coordinated operation. Furthermore, a current control using a pseudo synchronous d-q transformation is employed for grid current control with unity power factor. A 3 kW prototype PV PCS is built, and its experimental results are given to verify the effectiveness of the proposed control schemes.

Maximum Power Point Tracking Control of Photovoltaic System by using Current Solar Cell (태양전지 전류에 의한 계통연계형 태양광발전시스템의 최대출력 제어법)

  • 박인덕;성낙규;김대균;이승환;오봉환;김성남;한경희
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.109-112
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    • 1998
  • A step down chopper and PWM current source inverter is used for the connection between the PV array and the utility. This paper proposes chopper is controlled for the dc reactor decrease and PWM current source inverter is controlled to keep the output power at the maximum point for the PV. The PV current only is measured and employed for the power calculation combining the control parameter of the PWM current source inverter.

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