• Title/Summary/Keyword: single-phase grid-connected

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Design and Control of Grid-connected Photovoltaic system using the state space Modeling (상태공간 모델링을 이용한 계통연계 태양광발전시스템의 설계 및 제어)

  • Hwang, In-Ho;Kim, Si-Kyeong;Seong, Se-Jin
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.431-433
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    • 1996
  • It is expected that utility interactive small scale dispersed PV system will be widely diffused in the future. This paper discussed the design and control method of single phase PV inverter system with compensation capability of reactive power including harmonic distortion, based on state space modelling. As the results, compensation effects were suggested by simulation and experiment.

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Reactive Power Control using Single Phase Grid-Connected PV Power System (단상 계통 연계형 태양광 발전을 이용한 무효전력 제어)

  • Kim, Seung-Tak;Kang, Byung-Kwan;Park, Jung-Wook
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.509_510
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    • 2009
  • 태양광 발전 시스템은 그 특성에 따라 주로 주택, 빌딩 등 비선형 부하를 지니는 장소에 단상 계통으로 연결되는 경우가 많다. 계통 연계형 태양광 발전 시스템 설치가 증가함에 따라 태양광 발전 시스템의 무효전력 제어는 전력품질 향상에 대해 의미를 지니게 된다. 본 논문은 3kW급 단상 계통 연계형 태양광 발전 시스템에 대해 간편한 무효 전력 제어 방식을 보여준다.

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Comparison of Ripple Current Reduction methods in Grid Connected Single-phase Battery Charger (계통연계형 단상 배터리 충전기의 리플 전류 저감기법 비교)

  • An, Hyunsung;Lee, Jaedo;Cha, Hanju
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.250-251
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    • 2013
  • 본 논문은 계통연계형 단상 배터리 충전기에서 필연적으로 발생하는 2고조파 리플 전류에 대해서 분석하였으며, 이 리플 전류를 저감하기 위한 방법들을 제시하였다. 또한, 제시한 기법 중에 L-C 공진을 이용한 기법에 대한 실험을 진행하여 성능을 확인하였으며, 해석을 통해 비교하였다.

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Operation mode and Control method of PV ESS for Building Lighting (건물 조명을 위한 PV ESS 동작모드 및 제어기법)

  • Paeng, Seongil;Park, Unho;Choe, Gyu-ha
    • Proceedings of the KIPE Conference
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    • 2017.07a
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    • pp.118-119
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    • 2017
  • This paper proposes the operation mode and control method of the PV ESS for building lighting. The PV ESS is consisted of 3.3kW single phase grid connected PV inverter, Bi-direction DC/DC converter for Charging/Discharging for battery and DC48V Buck DC/DC converter for LED lighting.

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Implementation and Experiment of Single-phase Grid Connected Battery Charger (5kW급 계통연계형 단상 충전기의 구현 및 실험)

  • An, Hyunsung;Lee, Wujong;Cha, Hanju
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.109-110
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    • 2012
  • 본 논문에서는 계통연계형 단상 충전기 전류제어기법 및 충전과 방전을 수행하는 제어기법을 서술하였다. 정전류-정전압 모드를 통해 충전을 하며, 유효-무효전력 제어를 통해 방전을 수행하게 되고, 동기좌표 PI 제어기를 적용하여 전류제어를 수행한다. 5kW급 계통연계형 단상 충전기 프로토타입을 제작하여, 제안한 동작모드를 실험하여 그 성능을 확인하였다.

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Modeling and Simulation using Simulink and SimPowerSystem of optimized HTS FCL location in a Smart Grid having a Wind Turbine connected with the grid

  • Khan, Umer-Amir;Lee, Sang-Hwa;Seong, Jae-Kyu;Lee, Bang-Wook
    • Progress in Superconductivity and Cryogenics
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    • v.12 no.2
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    • pp.17-20
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    • 2010
  • A considerable amount of research material discussing designs and properties of High Temperature Superconducting Fault Current Limiter (HTS FCL) is available. However, a shortage of research concerning positioning of HTS FCL in power grid is felt. In this paper a feasibility study of HTS FCL positioning in Smart Grid through simulation analysis is carried out. A complete power network (including generation, transmission and distribution) is modeled in Simulink / SimPowerSystems. A generalized HTS FCL is also designed by integrating Simulink and SimPowerSystem blocks. The distribution network of the model has a wind turbine attached to it forming a micro grid. Three phase fault have been simulated along with placing FCL models at key points of the distribution grid. It is observed that distribution grid, having distributed generation sources attached to it, must not have a single FCL located at the substation level. Optimized HTS FCL location regarding the best fault current contribution from wind turbine has been determined through simulation analysis.

Control of a Single Phase Unified Power Quality Conditioner-Distributed Generation Based Input Output feedback Linearization

  • Mokhtarpour, A.;Shayanfar, H.A.;Bathaee, M.;Banaei, M.R.
    • Journal of Electrical Engineering and Technology
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    • v.8 no.6
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    • pp.1352-1364
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    • 2013
  • This paper describes a novel structure for single phase Unified Power Quality Conditioner-Distributed Generation (UPQC-DG) with direct grid connected DC-AC converter for low DC output DG systems which can be used not only for compensation of power quality problems but also for supplying of load power partly. This converter has been composed of one full-bridge inverter, one three winding high frequency transformer with galvanic isolation and two cycloconverters. Proper control based on Input Output feedback Linearization is used to tracking the reference signals. The simulation and experimental results are presented to confirm the validity of the proposed approach.

Analysis of the Admittance Component for Digitally Controlled Single-Phase Bridgeless PFC Converter

  • Cho, Younghoon;Mok, Hyungsoo;Lai, Jih-Sheng
    • Journal of Power Electronics
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    • v.13 no.4
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    • pp.600-608
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    • 2013
  • This paper analyzes the effect of the admittance component for the digitally controlled single-phase bridgeless power factor correction (PFC) converter. To do this, it is shown how the digital delay effects such as the digital pulse-width modulation (DPWM) and the computation delays restrict the bandwidth of the converter. After that, the admittance effect of the entire digital control system is analyzed when the bridgeless PFC converter which has the limited bandwidth is connected to the grid. From this, the waveform distortion of the input current is explained and the compensation method for the admittance component is suggested to improve the quality of the input current. Both the simulations and the experiments are performed to verify the analyses taken in this paper for the 1 kW bridgeless PFC converter prototype.

Digital Switching Control Method for Current shaping of Single Phase Flyback Inverter for Photovoltaic AC Modules (PV-AC 모듈형 단상 플라이백 인버터의 출력 전류 품질 보정을 위한 디지털 스위칭 제어기법)

  • Noh, Yong-Su;Lim, Sung-Bum;Ji, Young-Hyok;Jung, Doo-Yong;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.47-48
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    • 2012
  • In generally, grid connected single-phase flyback inverter is operated as boundary or discontinuous conduction mode. However, the flyback inverter can be operated in continuous conduction mode (CCM) due to its operating conditions in spite of it is designed to operate under boundary or discontinuous conduction mode. This situation causes unintended distortion to output current. In this paper, a current shaping method on unfolding bridge to reduce the output current distortion.

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Implementation and Control of AC-DC-AC Power Converter in a Grid-Connected Variable Speed Wind Turbine System with Synchronous Generator (동기기를 사용한 계통연계형 가변속 풍력발전 시스템의 AC-DC-AC 컨버터 구현 및 제어)

  • Song Seung-Ho;Kim Sung-Ju;Hahm Nyon-Kun
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.12
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    • pp.609-615
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    • 2005
  • A 30kW electrical power conversion system is developed for a variable speed wind turbine. In the wind energy conversion system(WECS) a synchronous generator with field current excitation converts the mechanical energy into electrical energy. As the voltage and the frequency of the generator output vary according to the wind speed, a 6-bridge diode rectifier and a PWM boost chopper is utilized as an ac-dc converter maintaining the constant dc-link voltage with only single switch control. An input current control algorithm for maximum power generation during the variable speed operation is proposed without any usage of speed sensor. Grid connection type PWM inverter converts dc input power to ac output currents into the grid. The active power to the grid is controlled by q-axis current and the reactive power is controlled by d-axis current with appropriate decoupling. The phase angle of utility voltage is detected using software PLL(Phased Locked Loop) in d-q synchronous reference frame. Experimental results from the test of 30kW prototype wind turbine system show that the generator power can be controlled effectively during the variable speed operation without any speed sensor.