• 제목/요약/키워드: Rated wind speed

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A Reliability Evaluation Model for the Power Devices Used in Power Converter Systems Considering the Effect of the Different Time Scales of the Wind Speed Profile

  • Ji, Haiting;Li, Hui;Li, Yang;Yang, Li;Lei, Guoping;Xiao, Hongwei;Zhao, Jie;Shi, Lefeng
    • Journal of Power Electronics
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    • 제16권2호
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    • pp.685-694
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    • 2016
  • This paper presents a reliability assessment model for the power semiconductors used in wind turbine power converters. In this study, the thermal loadings at different timescales of wind speed are considered. First, in order to address the influence of long-term thermal cycling caused by variations in wind speed, the power converter operation state is partitioned into different phases in terms of average wind speed and wind turbulence. Therefore, the contributions can be considered separately. Then, in regards to the reliability assessment caused by short-term thermal cycling, the wind profile is converted to a wind speed distribution, and the contribution of different wind speeds to the final failure rate is accumulated. Finally, the reliability of an actual power converter semiconductor for a 2.5 MW wind turbine is assessed, and the failure rates induced by different timescale thermal behavior patterns are compared. The effects of various parameters such as cut-in, rated, cut-out wind speed on the failure rate of power devices are also analyzed based on the proposed model.

사이드 펄링과 최적 토크스케줄을 고려한 소형 풍력터빈 해석 프로그램 개발 (Development of an Analysis Program for Small Horizontal Wind Turbines Considering Side Furling and Optimal Torque Scheduling)

  • 장현무;김동명;백인수
    • 한국태양에너지학회 논문집
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    • 제38권2호
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    • pp.15-31
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    • 2018
  • A program to design a small capacity wind turbine blade is proposed in this study. The program is based on a matlab GUI environment and designed to perform blade design based on the blade element momentum theory. The program is different from other simulation tools available in a point that it can analyze the side-furling power regulation mechanism and also has an algorithm to find out optimal torque schedule above the rated wind speed region. The side-furling power regulation is used for small-capacity horizontal axis wind turbines because they cannot use active pitch control due to high cost which is commonly used for large-capacity wind turbine. Also, the torque schedule above the rated wind speed region should be different from that of the large capacity wind turbines because active pitching is not used. The program developed in this study was validated with the results with FAST which is the only program that can analyze the performance of side-furled wind turbines. For the validation a commercial 10 kW wind turbine data which is available in the literature was used. From the validation, it was found that the performance prediction from the proposed simple program is close to those from FAST. It was also found that the optimal torque scheduling from the proposed program was found to increase the turbine power substantially. Further experimental validation will be performed as a future work.

난류 풍속에 대한 MW급 풍력발전기의 토크 제어기 응답 (Response of Torque Controller for a MW Wind Turbine under Turbulence Wind Speed)

  • 임채욱
    • 대한기계학회논문집A
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    • 제41권3호
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    • pp.173-180
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    • 2017
  • 정격풍속 이하에서 풍력발전기의 토크 제어기는 최대 출력 파워를 얻기 위하여 중요하다. 토크 제어의 주된 목적은 바람이 가진 에너지로부터 최대의 출력 파워를 얻도록 하는 것이다. 이를 위하여 최적모드게인을 이용하여 발전기 속도의 제곱에 비례하도록 발전기의 토크 크기를 조절하는 방법이 많이 적용되었다. 그러나 이 제어 방법은 풍력발전기가 수 MW급으로 대형화될수록 응답이 느려진다. 본 논문에서는 토크 제어기의 응답을 빠르게 하기 위하여 공력 토크의 로터 속도 비선형 파라미터를 제어 게인으로 이용하여 추가적인 토크 크기를 조절하는 방법을 고려하였다. 로터 속도 비선형 파라미터의 계산 시에 온라인 경우와 오프라인 경우를 각각 살펴보았다. 2MW 풍력발전기에 대하여 실제 난류 풍속에 대하여 수치실험을 수행하여 오프라인 경우가 출력 파워를 더 향상시키고 실용적임을 보인다.

풍력용 소용량 영구자석형 발전기의 설계 (Design of Small-Scaled Permanent Magnet Generators for Wind Power Applications)

  • 장석명;최장영;조한욱;유대준;경남호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.194-196
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    • 2006
  • This paper deals with design of a small-scaled permanent magnet generator (PMG) for wind power applications. First, this paper determines rated power and rated speed of the PMG from measured characteristics of wind turbines. Second, we derive analytical solutions for the open-circuit field in order to determine optimum magnet thickness and pole pitch/arc ratio. Third, on the basis of open circuit field solutions, stator magnetic circuit is designed. And then, a diameter of stator coil which agree with a required current density is calculated, and its turns are determined from the area of slot. Finally, finite element (FE) method is employed for validity of the designed PMG and, the back-emf measurements are also given to confirm the design.

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풍력 발전기 피치 제어를 위한 퍼지 PI 제어기 (A Fuzzy PI Controller for Pitch Control of Wind Turbine)

  • 천종민;김진욱;김홍주;최영규;김무림
    • 드라이브 ㆍ 컨트롤
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    • 제15권1호
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    • pp.28-37
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    • 2018
  • When the wind speed rises above the rated wind speed, the produced power of the wind turbines exceeds the rated power. Even more, the excessive power results in the undesirable mechanical load and fatigue. A solution to this problem is pitch control of the wind turbines. This paper presents a systematic design method of a collective pitch controller for the wind turbines using a discrete fuzzy Proportional-Integral (PI) controller. Unlike conventional PI controllers, the fuzzy PI controller has variable gains according to its input variables. Generally, tuning the parameters of fuzzy PI controller is complex due to the presence of too many parameters strongly coupled. In this paper, a systematic method for the fuzzy PI controller is presented. First, we show the fact that the fuzzy PI controller is a superset of the PI controller in the discrete-time domain and the initial parameters of the fuzzy PI controller is selected by using this relationship. Second, for simplicity of the design, we use only four rules to construct nonlinear fuzzy control surface. The tuning parameters of the proposed fuzzy PI controller are also obtained by the aforementioned relationship between the PI controller and the fuzzy PI controller. As a result, unlike the PI controller, the proposed fuzzy PI controller has variable gains which allow the pitch control system to operate in broader operating regions. The effectiveness of the proposed controller is verified with computer simulations using FAST, a NREL's primary computer-aided engineering tool for horizontal axis wind turbines.

풍력 터빈 시스템의 강인 피치 제어 (A Robust Pitch Control of Wind Turbine Systems)

  • 한명철;성창민;황욱
    • 한국정밀공학회지
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    • 제30권12호
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    • pp.1287-1293
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    • 2013
  • In this paper, we consider variable speed wind turbine systems containing uncertain elements. Though PI controller is generally used for pitch control, it cannot guarantee a stability and performance of the complicated wind turbine systems. A robust pitch control scheme is proposed to regulate the electric power output above the rated wind speed. The pitch controller is designed in order to guarantee uniform boundedness and uniform ultimate boundedness based on the bound values of the set where the uncertainties are laid or moves. In order to verify the proposed control scheme, we present stability analysis and simulation results using Matlab/Simulink.

대형 풍력발전기용 소형 모터-발전기 시스템 설계 (Design of a Small-Scale Motor-Generator System for a Large Wind Turbine)

  • 임채욱
    • 한국유체기계학회 논문집
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    • 제20권1호
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    • pp.48-52
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    • 2017
  • Small-scale motor-generator sets have been used in laboratories for verification of real large wind turbines whose rated power are more than 1 MW. In this paper, a result of designing a small-scale motor-generator system, which is composed of motor, gear box, flywheel, and generator, is presented in the aspect of speed response. Design objective is to make a small-scale motor-generator system have the same time constant and optimal tip speed ratio region as a real MW wind turbine. A small-scale 3.5 kW motor-generator system for emulating response of a 2 MW wind turbine is considered and designed.

수평축 풍력발전용 회전날개의 공력성능 해석 및 시동특성 모사에 관한 연구 (A Study on Aerodynamic Analysis and Starting Simulation for Horizontal Axis Wind Turbine Blade)

  • 공창덕;방조혁;김학봉
    • 한국추진공학회지
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    • 제3권3호
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    • pp.40-46
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    • 1999
  • 풍력발전용 회전날개의 공력성능과 시동특성은 정격출력 및 운용방법 등의 전체적인 시스템 성능을 결정짓는 중요한 요소이다. 따라서, 풍력발전용 회전날개를 설계한 경우 공력성능과 풍속 및 깃각에 따른 시동특성은 반드시 검토되어야 한다. 이를 위해 본 연구에서는 수평축 풍력발전용으로 개발된 회전날개의 공력성능을 해석하기 위한 프로그램을 개발하였으며, 타당성 검증을 위해 상용화 되어있는 회전날개의 공력성능해석을 수행한 결과 회사측에서 제시한 실험치와 잘 일치함을 확인하였다. 또한 개발된 공력 해석 프로그램을 바탕으로 시동특성 해석 프로그램을 개발하여 분석한 결과 우리나라와 같이 저풍속에서 운용되는 풍력발전기에는 가변깃각 제어방식이 유리함을 확인하였다.

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3MW급 해상 풍력발전시스템 개발현황 (Development Status of 3MW Class Offshore Wind Turbine)

  • 주완돈;박정훈;최준혁;임채욱;박종포
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2007년도 춘계학술대회
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    • pp.366-369
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    • 2007
  • This paper presents the general results of the conceptual design of a 3MW class offshore wind turbine named WinDS 3000 under development. In WinDS 3000, an integrated drive train design, three stage gearbox and permanent magnet generator (PMG) with fully rated converters have been introduced. A pitch regulated variable speed power control with individual pitch control has been adopted to regulate rotor torque while generator reaction torque can be adjusted almost instantaneously by the associated power electronics. Through the introduction of WinDS 3000, it is expected that helpful to understanding of the development status of 3MW offshore wind turbine.

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해상풍력 하부구조물 하중영향평가 및 해석기술연구 (A Study on Load Evaluation and Analysis for Foundation of the Offshore Wind Turbine System)

  • 권대용;박현철;정진화;김용천;이승민
    • 신재생에너지
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    • 제6권3호
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    • pp.39-46
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    • 2010
  • With growing of wind turbine industry, offshore wind energy is getting more attention in recent years. Among all the components of offshore wind turbines, the foundation of the offshore wind turbine plays a key role in stability of whole system. In this work, the 5 MW NREL reference wind turbine with rated speed of 11.4 m/s is used for load calculation. Wind and wave loads are calculated using GH-Bladed (Garard Hassan) and FAST (NREL). Additionally, FE simulation is carried out to investigate the wave effect on the support structure. Meanwhile, this work is to simulate systemic and optimized load cases for the foundation analysis of wind turbine system.