• Title/Summary/Keyword: dc/ac pwm Inverter

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A Control Method and Test Results of Utility-Interactive Photovoltaic Power Generation Systems (계통연계 태양광발전시스템의 제어기법 및 연계운전특성)

  • 황인호;안교상;임희천;김신섭
    • The Transactions of the Korean Institute of Power Electronics
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    • v.5 no.2
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    • pp.123-129
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    • 2000
  • This paper desclibes a design method and test results of grid-connected photovoltaic power 당eneration s systems, which consists of solar cells, DCI AC inverter, utility grid. A 50 kW photovoltaic power generation s system including a 3-phase DCI AC inverter is designed and made in order to investigate the system l pelionnance for glid connection. Also the control scheme of a three phase cmrent-controlled PWM inverter W with PI controller is presented by using d-q transformation. The experimental waveforms show that the p proposed system has stable behavior with em unit power factor in utility-interactive operation.

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Modeling and Analysis of Cascade Multilevel PWM Rectifier Using Circuit DQ Transformation

  • Park, Nam-Sup
    • Journal of information and communication convergence engineering
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    • v.1 no.3
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    • pp.163-168
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    • 2003
  • This paper presents a cascade multilevel PWM rectifier without the isolation transformers for energy build-up at each inverter modules. The features and advantages of the proposed PWM rectifier can be summarized as follows; I) It realizes the high power high voltage AC/DC power conversion, 2) It uses no transformer which is bulky and heavy, 3) It has hybrid structure so that switching devices can be effectively utilized, 4) It produces high quality AC current even in high power high voltage applications, 5) The input power factor remains unity by simple modulation index control. The multilevel rectifier is analyzed by using the circuit DQ transformation whereby the characteristics and control equations are obtained. Finally, it will be shown that the system simulation reveals the validity of analyses.

Drive of induction motor using three-phase inverter and voltage type PWM single-phase converter (전압형 PWM 단상 컨버터와 3상 인버터를 이용한 유도전동기의 운전)

  • 문상필;서기영;이현우;강욱중
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.15 no.3
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    • pp.18-24
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    • 2001
  • This paper deals with a three-phase Pulse width Modulation(PWM) voltage souse inverter-induction motor drive with a single-phase PWM converter. The single-phase system has the pulsating instantaneous power with twice the frequency of the ac source. The power pulsation generates the dc voltage pulsation of the converter. In result, the waveforms of the inverter output current and voltage are distorted. The steady-stare operations of the system are analyzed by employing a state-spare method Such everything confirmed it's validity throughout simulation and experiment.

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Input Power Estimation Method of a Three-phase Inverter for High Efficiency Operation of an AC Motor (교류 전동기의 고효율 운전을 위한 3상 인버터의 입력전력 추정 기법)

  • Kim, Do-Hyun;Kim, Sang-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.24 no.6
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    • pp.445-451
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    • 2019
  • An input power estimation method of a three-phase inverter for the high-efficiency operation of AC motors is proposed. Measuring devices, such as DC link voltage and input current sensors, are required to obtain the input power of the inverter. In the proposed method, the input power of the inverter can be estimated without the input current sensor by using the phase current information of the AC motor and the switching pattern of the inverter. The proposed method is more robust to parameter error than conventional method. The validity of the input power estimation method is verified through experiments conducted on a 1 kW permanent-magnet synchronous motor drive system.

Power Factor Correction of Single-phase Boost Converter for Low-cost Type UPS Configuration (저 가격형 UPS를 구성하기 위한 단상 부스트 컨버터의 고 역률 제어)

  • Park, Jong-Chan;Shon, Jin-Geun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.62 no.3
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    • pp.145-150
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    • 2013
  • A novel AC to DC PWM converters with unity input power factor are proposed to overcome the above shortcoming. The main function of these converters is to shape the input line current to force it exactly in phase with the input AC voltage. Therefore, the input power factor can be improved to near unity and the input current harmonics can be eliminated. In this paper, half-bridge converter with two active switches and two diodes are utilized for low-cost type UPS configuration. By having only two semiconductors in the current path at any time, losses can be reduced over the conventional boost topology. Also, this converter provides controllable dc-link voltage, high power factor, and low cost type converter by simple power circuits. Simulation results show that the proposed half-bridge converter/inverter control technique can be applied to single-phase low-cost type UPS systems successfully.

A Characteristic of commercial frequency unity Resonant PWM Inverter. (상용 주파수용 단일 공진 PWM 인버터의 특성)

  • Kim, Jong-Hae;Bae, Sang-June;Kim, Kyung-Sik;Moon, Chang-Soo;Ahn, Hang-Mok
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.318-320
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    • 1996
  • This paper describes a new dc/ac inverter system, which makes use of parallel loaded high frequency resonant inverter consisting of full bridge, for achieving sinusoidal ac waveform. Because current throughout switch at turn-on is always zero in proposed inverter, low stress and low switching loss is achieved. Operating characteristic of proposed system is analyzed in per unit system using computer simulation. Output voltage of it include low harmonics and almost close tn sine wave.

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A Study on Technology Development of High Capacity PWM Converter for Electric Vehicle (전기철도용 대용량 PWM 컨버터 기술개발에 관한 연구)

  • Han, Young-Jae;Jo, Jeong-Min;Bae, Chang-Han;Lee, Young-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.12
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    • pp.1729-1734
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    • 2018
  • Recently, interest in environmentally friendly transportation systems has been increasing, and study on railway systems has been aggressively conducted. Therefore, lots of studies have been done in railway advanced countries to improve performance of PWM converter. The research on the PWM converter for railway vehicle was mainly carried out on the converter mounted on railway vehicle such as the high-speed railway and metropolitan railway. In also, a lot of study has been carried out to improve converter performance installed in the ground. The high-capacity transform used in this paper converted from AC 22.9kV to AC 590V. The converter changed from AC 590V to DC 950V. In general, in the case of rectifier, the DC power supply system has a negative impact on inverter control characteristics because it can not avoid the pulsating component. In this study, it was performed current control for high-capacity converter using Matlab Simulink. The PWM converter is normally performed through the voltage and current at starting mode, powering mode, and braking mode. In the light-load test and the on-line test, we have studied for the PWM converter characteristics. Using this research, we have founded that the converter has excellent performance.

A Study on the Parameter Optimization of Inverter for Induction Heating Cooking Appliance (유도가열 조리기기용 인버터 파라미터 최적화에 관한 연구)

  • Kang, Byung-Kwan;Lee, Se-Min;Park, Jung-Wook
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.1
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    • pp.77-85
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    • 2009
  • With the advent of power semiconductor switching devices, power electronics relating to high frequency electromagnetic eddy current based induction heating technology have become more suitable and acceptable. This paper presents high-frequency induction heating cooking appliance circuit based on the zero current switching-PWM single ended push-pull(ZCS-PWM SEPP) resonant inverter added AC-DC converter. This inverter uses pulse-width-modulation(PWM) control method with active auxiliary quasi-resonant lossless inductor snubbers and a switched capacitor. To improved the transient performance, the PI controller is applied for this system. For the systematic parameter optimization of the PI controller, the gradient-based optimization algorithm is applied. The performance of optimized parameters is evaluated using simulation and experimental test. These results show that the proposed systematic optimal tuning method improve the transient performances of this system.

Study of 60Hz Transformer-less High Frequency Linked Grid-Connected Power Conditioners for Photovoltaic Power System (60Hz 절연변압기가 없는 고주파링크방식 계통연계형 태양광발전시스템 고찰)

  • 유권종;정영석;최주엽
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.6
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    • pp.563-569
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    • 2002
  • This paper proposes an inverter for the grid-connected photovoltaic system based on the transformer-less inverter. This system consists of a high frequency DC-DC converter, high frequency transformer, diode bridge rectifiers, a DC filter, a low frequency inverter, and an AC filter. The 20kHz switched high frequency converter is used to generate bipolar PWM pulse, and the high frequency transformer transforms its voltage twice, which is subsequently rectified by diode bridge rectifiers for a full-wave rectified 60 Hz sine wave power output. Even though the high frequency link system needs more power semiconductors, a reduced size, light weight, and saved parts cost make this system more comparative than other power conditioning systems due to elimination of 60Hz transformer.

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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