• 제목/요약/키워드: Wind Generator

검색결과 920건 처리시간 0.032초

DFIG 풍력발전시스템에 관한 연구 (Study on Doubly Fed Induction Generator in a wind turbine)

  • 한상열;차삼곤;최원호;이승구
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2006년도 춘계학술대회
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    • pp.253-256
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    • 2006
  • This paper shows operating characteristics of DFIG(Double Fed Induction Generator) for wind turbine. The back to back PWM voltage-fed inverter connected between the rotor and grid network operated sub and super-synchronous operating mode, and the vector-controlled DFIG enables the decoupling between active and reactive power as well as between torque and power factor. This paper is validated by simulations and experimental results.

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도서지역 적용을 위한 230 kW급 저풍속 중형 풍력발전기의 전자장해석 (Electromagnetic Field Analysis of 230 kW-class Low Wind Speed Medium Wind Turbine for Island-area Application)

  • 최만수;최혜원;이창민;최현준
    • 신재생에너지
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    • 제16권2호
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    • pp.14-19
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    • 2020
  • Recently, a project to build a carbon zero island with no carbon emissions has been carried out by replacing diesel generators with renewable energy sources in island areas where diesel generators supplied local loads as independent systems. To minimize damage to the lives of islanders, low noise wind generators should be installed by adjusting the rated speed. In islands with low loads, wind turbines that are more efficient than medium-sized wind turbines should be installed. In this study, the generator field analysis and characteristics were analyzed to develop 230 kW-class low wind medium-wind turbine technology. The electromagnetic field analysis program used Maxwell. As a result, the cogging torque was reduced, and the initial maneuver wind speed and loss value were lowered. Hence, the output amount was increased with high efficiency.

난류풍속에 대한 MW급 풍력터빈의 토크제어 방법에 따른 응답 특성 비교 (Comparison of Response Properties Determined in Two Torque Control Methods for a 2.75-MW Wind Turbine Under Turbulence Wind Speed)

  • 임채욱;서강윤
    • 대한기계학회논문집A
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    • 제34권12호
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    • pp.1885-1891
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    • 2010
  • 풍력터빈의 토크제어는 정격풍속 이하에서 매우 중요하다. 토크제어의 주된 목적은 바람이 가진 공기역학적 파워로부터 최대의 파워를 얻도록 하는 것이다. 풍력터빈의 토크제어 방법은 토크모드 제어와 속도모드 제어로 크게 두 경우로 구분된다. 토크모드 제어는 풍력터빈에서 잘 알려지고 전통적으로 사용되는 방법으로 발전기 회전속도의 제곱에 비례하도록 발전기의 토크크기를 발생시킨다. 속도모드 제어에서는 발전기의 토크크기를 발생하기 위하여 PI 제어기를 사용한다. 본 논문에서는 실제 풍속이 난류인 점을 고려하여 2.75 MW 풍력터빈을 대상으로 두 토크제어 방법을 적용한 수치실험 결과를 제시하고 응답특성을 비교한다.

Wind Power Grid Integration of an IPMSG using a Diode Rectifier and a Simple MPPT Control for Grid-Side Inverters

  • Ahmed, Tarek;Nishida, Katsumi;Nakaoka, Mutsuo
    • Journal of Power Electronics
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    • 제10권5호
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    • pp.548-554
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    • 2010
  • In this paper, a 1.5 kW Interior Permanent Magnet Synchronous Generator (IPMSG) with a power conditioner for the grid integration of a variable-speed wind turbine is developed. The power-conditioning system consists of a series-type 12-pulse diode rectifier powered by a phase shifting transformer and then cascaded to a PWM voltage source inverter. The PWM inverter is utilized to supply sinusoidal currents to the utility line by controlling the active and reactive current components in the q-d rotating reference frame. While the q-axis active current of the PWM inverter is regulated to follow an optimized active current reference so as to track the maximum power of the wind turbine. The d-axis reactive current can be adjusted to control the reactive power and voltage. In order to track the maximum power of the wind turbine, the optimal active current reference is determined by using a simple MPPT algorithm which requires only three sensors. Moreover, the phase angle of the utility voltage is detected using a simple electronic circuit consisting of both a zero-crossing voltage detecting circuit and a counter circuit employed with a crystal oscillator. At the generator terminals, a passive filter is designed not only to decrease the harmonic voltages and currents observed at the terminals of the IPMSG but also to improve the generator efficiency. The laboratory results indicate that the losses in the IPMSG can be effectively reduced by setting a passive filter at the generator terminals.

Stochastic Stability Analysis of the Power System Incorporating Wind Power using Measurement Wind Data

  • Parinya, Panom;Sangswang, Anawach;Kirtikara, Krissanapong;Chenvidhya, Dhirayut
    • Journal of Electrical Engineering and Technology
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    • 제13권3호
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    • pp.1110-1122
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    • 2018
  • This paper proposes an alternative method to evaluate the effect of wind power to the power system stability with small disturbance. Alternatively, available techniques for stability analysis of a power system based on deterministic methods are less accurate for high penetration of wind power. Numerical simulations of random behaviors are computationally expensive. A stochastic stability index (SSI) is proposed for the power system stability evaluation based on the theory of stochastic stability and energy function, specifically the stochastic derivative of the relative well-defined energy function and the critical energy. The SSI is implemented on the modified nine-bus system including wind turbines under different conditions. A doubly-fed induction generator (DFIG) wind turbine is characterized and modeled using measured wind data from several sites in Thailand. Each of the obtained wind power data is analyzed. The wind power effect is modeled considering the aggregated effect of wind turbines. With the proposed method, the system behavior is properly predicted and the stability is quantitatively evaluated with less computational effort compared with conventional numerical simulation methods.

풍력발전 설비용 IEC 61400-25 기반 통신 시스템 구축 (Implementation of IEC 61400-25 based communication system for wind power plants)

  • 이정훈;김태오;이홍희
    • 전기학회논문지
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    • 제58권7호
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    • pp.1356-1362
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    • 2009
  • IEC 61400-25(Communications for monitoring and control of wind power plants) is established as a international standard by IEC TC 88 in 2007 with the growth of the wind power industry. In this paper, MMS service which is defined in lEC 61400-25 part 4 is implemented, and the wind power generator is objectified by using the VMD of MMS service. We also implemented MMS communication system between the wind power generator and the local control center using the proposed VMD. The performance of the developed MMS communication system is verified through the XML based user interface on the web browser.

가변속 유체토르크 컨버터를 이용한 풍력발전 시스템 연구 (A Study of the Wind Turbine System by Variable Speed Hydraulic Torque Converter)

  • 정경원;김동용;김희규
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.1114_1115
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    • 2009
  • The wind most of the century, the average wind speed in the coast area 6m/s~8m/s operation as a large wind power generators is not enough to produce. But the generator of proposed wind turbine system is connected to Hydraulic torque converter is the actual development of this usage, the low investment and economic effects appear to be much lower there is. In case of the proposed wind turbine system, is possible to make torque transmission long distance, set up generator somewhere in between the tower or the ground as well as, nacelle weight can be greatly down.

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PSCAD/EMTDC를 이용한 계통연계형 풍력발전시스템 모델링 (Modeling of Grid-connected Wind Energy Conversion System Using PSCAD/EMTDC)

  • 김슬기;김응상
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.320-322
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    • 2002
  • The paper presents an electrical model of a grid-connected wind energy conversion system (WECS) with a variable speed drive, a fixed pitch angle, a synchronous generator as a wind generator and AC-DC-AC conversion scheme for simulating dynamic behaviors and performance responding to varying wind speed input. The electric output of the WECS is controlled by the AC-DC-AC conversion scheme, the objective of which is to capture the maximum active power under varying wind conditions and to keep the voltage of WECS terminal bus at a specific level. Aerodynamic models are used to incorporate the power characteristics to wind speed. The modeling and simulation of the WECS are realized on PSCAD/EMTDC environment.

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풍력발전시스템의 배전계통 연계운전 시 전의품질 해석 (Power Quality Analysis of Wind Power System Embedded in Distribution Networks)

  • 김응상;노병권;추진부;장병태;이승학
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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    • pp.229-231
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    • 1999
  • This paper deals with electromagnetic transient modelling of wind power system embedded in distribution networks. Wind power system consists of induction generator link reactor, distribution line, and controlled load unit. The introduction of embedded wind power system presents a new set of conditions to networks both with respect to power quantify needed to be transported and power quality such as sag swell, very short interruption, and flicker. This paper investigates the transient behavior of voltage, frequency, and load flow in wind driven induction generation system embedded in distribution networks.

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An Optimal Maximum Power Point Tracking Algorithm for Wind Energy System in Microgrid

  • Nguyen, Thanh-Van;Kim, Kyeong-Hwa
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2018년도 전력전자학술대회
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    • pp.382-383
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    • 2018
  • To increase the efficiency of a wind energy conversion system (WECS), the maximum power point tracking (MPPT) algorithm is usually employed. This paper proposes an optimal MPPT algorithm which tracks a sudden wind speed change condition fast. The proposed method can be implemented without the prior information on the wind turbine parameters, generator parameters, air density or wind speed. By investigating the directions of changes of the mechanical output power in wind turbine and rotor speed of the generator, the proposed MPPT algorithm is able to determine an optimal speed to achieve the maximum power point. Then, this optimal speed is set to the reference of the speed control loop. As a result, the proposed MPPT algorithm forces the system to operate at the maximum power point by using a three-phase converter. The simulation results based on the PSIM are given to prove the effectiveness of the proposed method.

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