• Title/Summary/Keyword: grid connection

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Firing Angle Control of Soft Starter for Reduction of Inrush Current during Grid Connection of Induction-type Wind Generator (유도형 풍력발전기 계통 연계시 돌입전류 저감을 위한 소프트 스타터 점호각 제어)

  • Song Seung-Ho;Kwon Tae-Hwa
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.4
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    • pp.397-402
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    • 2005
  • A new control algorithm of soft starter is proposed for the reduction of the inrush current during the grid connection of the induction-type wind power generator. Currently, the fixed speed wind turbine using induction generator is the most popular wind generation system in Korea. It is shown that the amount of inrush current mainly depends on the control algorithm of the soft starter, a thyristor-based grid connection device. For the simulation study, a 600kw wind turbine simulation model is developed and the transient waveforms are investigated with conventional md proposed methods. Also experimental results using 3.7kW experimental set-up show that the peak value of inrush current is reduced about 20$\%$ using proposed algorithm.

Techno-Economic Analysis of Water Electrolysis System Connected with Photovoltaic Power Generation (태양광 발전 연계 수전해 시스템의 경제성 분석)

  • HWANG, SUNCHEOL;PARK, JIN-NAM
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.6
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    • pp.477-482
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    • 2021
  • Hydrogen production, hydrogen production cost, and utilization rate were calculated assuming four cases of hydrogen production system in combination of photovoltaic power generation (PV), water electrolysis system (WE), battery energy storage system (BESS), and power grid. In the case of using the PV and WE in direct connection, the smaller the capacity of the WE, the higher the capacity factor rate and the lower the hydrogen production cost. When PV and WE are directly connected, hydrogen production occurs intermittently according to time zones and seasons. In addition to the connection of PV and WE, if BESS and power grid connection are added, the capacity factor of WE can be 100%, and stable hydrogen production is possible. If BESS is additionally installed, hydrogen production cost increases due to increase in Capital Expenditures, and Operating Expenditure also increases slightly due to charging and discharging loss. Even in a hydrogen production system that connects PV and WE, linking with power grid is advantageous in terms of stable hydrogen production and improvement of capacity factor.

Photovoltaic Multi-string PCS with a Grid-connection (계통연계형 멀티스트링 태양광 발전 시스템)

  • Kwon, Jung-Min;Kim, Eung-Ho;Nam, Kwang-Hee;Kwon, Bong-Hwan
    • New & Renewable Energy
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    • v.3 no.4
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    • pp.69-76
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    • 2007
  • In this paper, a PV multi-string PCS with a grid-connection is proposed. An improved MPPT algorithm for the PV multi-string PCS is suggested. Each PV string has its own MPP tracker and the proposed MPPT algorithm prevents LMPP tracking due to power ripple. In the PV PCS with single-phase inverter has a large current ripple at twice the grid frequency. The current ripple reduction algorithm without external component is suggested. Also, this paper proposes a simple control method to achieve sharing of the PV string voltage and current among the interleaved parallel boost converters. All algorithms and controllers are implemented on a single-chip microcontroller. Experimental results obtained on a 3kW prototype show high performance of the proposed PV multi-string PCS.

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Multi-level PWM Inverter for 3-Phase High Voltage Power On-Grid (3상 고압 전력연계를 위한 다중레벨 인버터)

  • Ahn, Hyun-Jin;Lee, Hwa-Chun;Song, Sung-Gun;Lee, Sang-Hun;Park, Sung-Jun;Kim, Kwang-Heon;Lim, Young-Cheol
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.562-564
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    • 2008
  • This paper deals with the three phase high voltage power-grid connection topology using multi-level inverter. Due to the multi-level inverter, these are improved effect of fluctuating voltage, problem of EMC and switching loss using suitable switching patterns of device, above all thing, it is easy to realize the system because of using lower voltage rating switch. This topology can be applicable to power-grid connection of wind system, there is a good point about economical efficiency. The simulation results are presented to verify the validity of the proposed topology.

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Performance Test of MGT Combined Heat & Power System (마이크로 가스터빈 열병합 발전시스템 성능평가)

  • Hur, Kwang-Beom;Park, Jung-Keuk;Rhim, Sang-Kyu
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.313-316
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    • 2006
  • As Decentralized Generation(DG) becomes more reliable and economically feasible, it is expected that a higher application of DG units would be interconnected to the existing grids. This new market penetration of DG technologies is linked to a large number of factors like technologies costs and performances, interconnection issues, safety, market regulations, environmental issues or grid connection constrains. Korea Electric Power Corporation (KEPCO) has researched performance characteristics of the 60k W class 1) basic start-up & shutdown operation analysis 2) interconnection test 3) MGT -absorption chiller-heater system in the local condition. Variations of heat recovery from exhaust gas has measured according to micro gas turbine output of 15, 30, 45, 60kW. From those results, the performance of the MGT-absorption chiller/heater system has been evaluated. The suggested strategy and experience for the evaluation of the distributed generation will be used for the introduction of other distributed generation technologies into the grid in the future.

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Photovoltaic Multi-string PCS with a Grid-connection (계통연계형 멀티스트링 태양광 발전 시스템)

  • Kwon, Jung-Min;Kim, Eung-Ho;Kwon, Bong-Hwan
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.11a
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    • pp.255-258
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    • 2007
  • In this paper, a PV multi-string PCS with a grid-connection is proposed. An improved MPPT algorithm for the PV multi-string PCS is suggested. Each PV string has its own MPP tracker and the proposed MPPT algorithm prevents LMPP tracking due to power ripple. In the PV PCS with single-phase inverter has a large current ripple at twice the grid frequency. The current ripple reduction algorithm without external component is suggested. Also, this paper proposes a simple control method to achieve sharing of the PV string voltage and current among the interleaved parallel boost converters. All algorithms and controllers are implemented on a single-chip microcontroller. Experimental results obtained on a 3kW prototype show high performance of the proposed PV multi-string PCS.

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Development of a 50kW Photovoltaic Power Generation System for Gird Connection(I) (50 kW급 계통연계형 태양광 발전시스템 개발(I))

  • Ahn, K.S.;Lim, H.C.;Hwang, I.H.
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.31-33
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    • 1999
  • In this paper, a operating characteristics of the 50 kW grid-connected Photovoltaic(PV) Power system which is by means of initial PV datum analyzing is reported. The development of a 50 kW class photovoltaic power generation system including a DC/AC inverter is suggested to investigate the system performance for grid connection. The results of the demonstration test of a 50 kW class grid-connected PV system show that the system utilization rate is 15.6% and the inverter efficiency is 94% at 80% load.

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A characteristics on the generating Power of a 3-Phase Photovoltaic Power system for grid-connection (3상 계통연계형 태양광 발전시스템의 출력특성)

  • Ahn, Kyo-Sang;Lim, Hee-Chun;Hwang, In-Ho
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.1171-1173
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    • 2000
  • This paper was analyzed the high-frequency harmonics, power conversion rate, results of the system's monitor, and measuring data of the system power output of a 3-phase photovoltaic power system for grid-connection. The photovoltaic power system consists of a 3-phase inverter array, and data acquisition system. The result of an analyzing data of the 50 kW class grid-connected photovoltaic system showed the stable behavior in utility-interactive operation.

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Evaluation on Effect of Wind Power Generation System According to Transformer Winding Connection at Matlab&Simulink (MATLAB&SIMULINK에서 변압기 결선에 따른 풍력발전 시스템의 영향 평가)

  • An, Hae-Joon;Ro, Kyoung-Soo
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.772-773
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    • 2007
  • This study suggests a modeling of grid-connected wind power generation system that has induction generator, and aims to perform simulations for outputs by the variation of actual wind speed and for fault current of wind generation system by the transformer winding connection. This study is implemented by matlab&simulink. The simulation shall be performed by assuming single line to ground fault generated in the system. Generator power, rotor speed, terminal voltage, system voltage, and fault current shall be observed following the performance of simulation. The fault current change will be dealt through the simulation results for fault current of wind generation system following the grid-connected transformer winding connection and the simulation result by the transformer neutral ground method.

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Simulation for fault current of wind turbine generating system following transformer winding connection (변압기결선에 따른 풍력발전시스템의 고장전류에 대한 시뮬레이션)

  • An, Hae-Joon;Ro, Kyoung-Soo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.454-457
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    • 2007
  • This study suggests a modeling of grid-connected wind turbine generation system that has induction generator, and aims to perform simulations for outputs by the variation of actual wind speed and for fault current of wind generation system by the transformer winding connection. This study is implemented by MARTLB & SIMULINK. The simulation shall be performed by assuming single line to ground fault generated in the system Generator power, rotor speed, terminal voltage, system voltage, and fault current shall be observed following the performance of simulation. The fault current change will be dealt through the simulation results for fault current of wind generation system following the grid-connected transformer winding connection and the simulation result by the transformer neutral ground method.