• Title, Summary, Keyword: Power conditioner

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Utility-Interactive Four-Switch Three-Phase Soft-Switching Inverter with Single Resonant DC-Link Snubber and Boost Chopper

  • Ahmed, Tarek;Nagai, Shinichiro;Nakaoka, Mutsuo;Tanaka, Toshihiko
    • Journal of Power Electronics
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    • v.7 no.2
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    • pp.109-117
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    • 2007
  • In this paper, a novel proposal for a utility-interactive three-phase soft commutation sinewave PWM power conditioner with an auxiliary active resonant DC-link snubber is developed for fuel cell and solar power generation systems. The prototype of this power conditioner consists of a PWM boost chopper cascaded three-phase power conditioner, a single two-switch auxiliary resonant DC-link snubber with two electrolytic capacitors incorporated into one leg of a three-phase V-connection inverter and a three-phase AC power source. The proposed cost-effective utility-interactive power conditioner implements a unique design and control system with a high-frequency soft switching sinewave PWM scheme for all system switches. The operating performance of the 10 kW experimental setup including waveform quality, EMI/RFI noises and actual efficiency characteristics of the proposed power conditioner are demonstrated on the basis of the measured data.

Power Conditioner with Variable Current Loop Gain (가변 전류루프이득을 가지는 Power Conditioner)

  • Jeong, C.Y.;Lee, Y.W.;Baek, J.W.;Yoo, D.W.;Ann, C.M.;Joo, G.Y.
    • Proceedings of the KIEE Conference
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    • pp.1101-1104
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    • 2001
  • This paper describes a newly developed power conditioner with variable current loop gain. The power conditioner consists of a do-link capacitor and three phase inverter with coupled inductor. This system is very well operated to compensate current harmonics and asymmetries caused by nonlinear load and unbalance loads. The power conditioner shapes the source current sinusoidal in phase with source voltage. A 100kVA power conditioner was built and the controller is realized with DSP Experimental results for many load conditions are presented to verify the performance of the controller.

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Series-connected Power Conversion System Integrating a Photovoltaic Power Conditioner with a Charge-balancing Circuit (태양광 전력조절기와 배터리 전하 밸런스 회로를 통합시킨 직렬형 전력변환 시스템)

  • Lee, Hyun-Jun;Shin, Jong-Hyun;Park, Joung-Hu
    • The Transactions of the Korean Institute of Power Electronics
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    • v.20 no.5
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    • pp.389-394
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    • 2015
  • This paper proposes a series-connected power conversion system that integrates a photovoltaic power conditioner and a charge-balancing circuit. In conventional methods, a photovoltaic power conditioner and a cell-balancing circuit are needed for photovoltaic systems with energy storage devices, which results in a complex configuration and high cost. To overcome these problems, a series-connected DC-DC power conditioning system that integrates a photovoltaic power conditioner with a charge-balancing circuit is proposed. During the generation, the system operates as power conditioner only, whereas it operates as a cell balancing circuit during the rest time. For the analysis, the operating principle of the circuit and the controller design are done by PSIM simulation. For verification, a hardware prototype with 48-W photovoltaic modules has been implemented. Results verified that the modularized photovoltaic power conversion system with a series-connected storage successfully works with the proposed method.

Performance Analysis of UPQC(Unified Power Quality Conditioner) with Compensation Capability for Voltage Interruption (순간정전에 대한 보상능력을 갖는 UPQC(Unified Power Quality Conditioner)의 성능해석)

  • 김희중;배병열;한병문;설승기;조보형
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.5
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    • pp.279-286
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    • 2003
  • A new UPQC(unified power quality conditioner), which consists of series inverter, shunt inverter, dc/dc converter, and energy storage, is proposed. The proposing UPQC can compensate reactive power, harmonics, voltage sag and swell, voltage unbalance, and voltage interruption. The control strategy for the proposing UPWQC was derived using the instantaneous power method. The performance of proposing system was analyzed by means of the EMTDC/PSCAD simulation and the experimental work with the hardware prototype. The proposing UPQC has the ultimate capability of improving power quality at the point of installation on power distribution systems or industrial power systems and can be utilized for the custom power device in the future distribution system.

Performance Analysis for the UPQC(Unified Power Quality Conditioner) Interconnected to the Distributed Generation System (분산전원 연계형 UPQC(Unified Power Quality Conditioner)의 성능해석)

  • 김희중;배병열;한병문
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.3
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    • pp.152-160
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    • 2004
  • A novel UPQC(Unified Power Quality Conditioner), which consists of series inverter, shunt inverter, distributed generation system, is proposed. The proposing system can compensate reactive power, harmonics, voltage sag and swell, voltage interruption etc. through the change of paralleling operation mode and islanding operation mode. The control strategy for the proposing system was derived using the instantaneous power method. The performance of proposing system was analyzed by means of the PSCAD/EMTDC simulation and the experimental work with the hardware prototype. The proposing system has the ultimate capability of improving power quality at the point of installation on power distribution systems or Industrial power systems and can be utilized for the custom power device in th future distribution system.

Parametric Study on Performance of an Automobile Air Conditioner (차량용 에어컨의 성능에 미치는 인자에 관한 연구)

  • Park, Y.C.;Kwon, K.R.
    • Journal of the Korea Society For Power System Engineering
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    • v.6 no.4
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    • pp.16-22
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    • 2002
  • This study was conducted to find performance evaluation method for automobile air conditioner. Experimental facilities were constructed to simulate wide range of operating condition for the automobile air conditioner. Compressor speed was controled by variable speed electric motor and the power was measured through torque transducer and tachometer was used to measure compressor speed. Parametric studies were conducted in this study, to figure out effect of environment variables on the performance of the automobile air conditioner. The environmental variables are inlet air temperature, relative humidity and air flow rate for the evaporator and inlet air temperature and air flow rate for the condenser. Compressor speed is also changed. The results of this study shows that air flow rate of the evaporator is more sensitive to the performance of the automobile air conditioner than the other variables. However relative humidity of the inlet air of the evaporator strongly affects capacity rather that COP.

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Direct Load Control System for Air-conditioner (에어컨부하 직접 제어시스템 실용화 연구)

  • Ko, Sang-Cheon;Lee, Sang-Yun;Kim, Myong-Soo
    • Proceedings of the KIEE Conference
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    • pp.3051-3053
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    • 1999
  • In recent years, it becomes a worldwide trend that the power utilities focus their attention to Demand Side Management. Increasing Electric power consumption, they adopt a direct load management to accomplish low cost and stability of electric supply. Following this trend, KEPCO is researching a Direct Load Control System for Air Conditioner. This Paper presents the development results of the Direct Load Control System to Control electric power consumption of Conditioner in summer period this year.

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Residential Solar Cell System by driving of High Efficiency Inverter

  • Kwak Dong-Kurl;Lee Hyun-Woo
    • Proceedings of the KIPE Conference
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    • pp.687-691
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    • 2001
  • With today's global environmental and energy problems, high expectations exist for solar power generation to reduce carbon dioxide generated by the consumption of fossil fuels. On the other hand, power consumption in residential homes is increasing every year. Among the many household appliances, the power demand for air conditioners increases dramatically during the summer, particularly in the afternoons. As this pattern closely matches the output pattern of solar cells, it should be possible to combine a photovoltaic array with an air conditioner to decrease the energy consumption within the home. We have developed a residential solar-powered air conditioner that operates through a combination of photovoltaic array and commercial power. In this paper, the configuration and specification of the residential solar-powered system are described to a novel high efficiency inverter using a ZVCS boost converter. And the performance evaluations of the solar-powered air conditioner are examined by the analysis of a new tracking controller with a maximum power $P_{max}$ detection of solar cell.

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Current Sensorless Control of the Voltage Bus Conditioner for a DC Power System with Parallel Pulsed Power Loads (병렬 펄스 부하를 갖는 직류 전력시스템을 위한 Voltage Bus Conditioner의 전류 센서 없는 제어)

  • Lee, Byung-Hun;Chang, Han-Sol;La, Jae-Du;Kim, Young-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.11
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    • pp.1617-1624
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    • 2012
  • A DC power system has many loads with varied functions. Also, there may be large pulsed loads with short duty ratios which can affect the normal operation of other loads. In this paper, Voltage Bus Conditioner(VBC) without any current sensors is proposed to damp the bus voltage transients by parallel pulsed loads. The proposed control approach requires only one voltage sensor and carries out both the functions of damping the bus voltage transients and maintaining the level of energy stored. The proposed control technique has been implemented on a TMS320F2812 Digital Signal Processor(DSP). Simulated results by a Matlab Simulink and experimental results are presented which verify the control principles and demonstrate the practicalty of the approach.

Sinewave-PWM ZVS Inverter using High-Frequency Transformer for Utility AC Voltage Link

  • Chandhaket S.;Ogura K.;Konishi Y.;Nakaoka M.
    • Proceedings of the KIPE Conference
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    • pp.511-515
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    • 2003
  • This paper presents a novel prototype of the utility-interfaced sinusoidal pulse width modulated (SPWM) inverter using the high-frequency flyback transformer fur the small-scale solar photo-voltaic power conditioner (1kW - 4kW). The proposed SPWM power conditioner circuit with a high-frequency link has a function of electrical isolation, which is vital fur solar photovoltaic power conditioner systems with the viewpoint of safety and convenience. The discontinuous conduction mode (DCM) operation of the flyback transformer is also maintained to simplify the topology of the inverter circuit and control scheme. First, the operating principle of the proposed circuit is described far the understanding of the circuit parameters establishment. Then, the digitally constructed SPWM control scheme is presented. The proposed circuit is verified by the computer simulation and the prototype experiment.

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