• Title, Summary, Keyword: direct-drive wind power generator

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Maximum Power Control of Small Direct-Drive Wind Power Generator (소형 직접구동형 풍력발전기의 최대 출력제어)

  • Kim Chul-Ho;Lee Woo-Seok;Seo Young-Taek;Oh Chul-Soo
    • Proceedings of the KIEE Conference
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    • pp.875-877
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    • 2004
  • Research related to renewable energy is urgently required to cope with the depletion of fossil fuel and the environmental pollution. This paper deals with maximum power control of 1kW rating wind power generator. To implement direct-drive generator, axial flux permanent magnet generator is adopted to test the converter. The blade is attached to the surface of outer rotor disk. Generally wind power generator is operated under the rated wind speed. To capture maximum power at my given wind speed, the coordination of generator and converter is essential. Buck/Boost converter is designed to charge 24V battery and under the low wind speed it operates as boost converter.

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Mechanical Design of a 750 kW Direct-drive Wind Turbine Generator System (750kW급 풍력터빈발전기의 기계설계)

  • Sohn, Y. U.;Son, J. B.;Park, I. S.;Kim, Y. C.;Kim, K. R.;Chung, C. W.;Chun, Ch. H.;Ryu, J. Y.;Park, J, I.;Byun, C. J,;Kim, D. H.
    • 유체기계공업학회:학술대회논문집
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    • pp.379-384
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    • 2004
  • A prototype of 750 kW direct-drive wind turbine generator system, KBP-750D is under development in Korea. For the gearless, direct-drive prototype a synchronous generator with permanent magnets has been developed. The upwind 3-blade type machine employs variable speed and pitch control. The operating ranges of wind and rotor speed are 3 to 25 m/s and 9 to 25 rpm, respectively. The tip speed ratio of rotor blade is 7.5, designed for power coefficient 0.47, The blade pitch and torque are controlled with the predefined torque-speed curve according to the conditions of wind and public electric grid. This paper describes the outlines of primary components of KBP-750D.

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Design and Performance Analysis of Coreless Axial-Flux Permanent-Magnet Generator for Small Wind Turbines

  • Chung, Dae-Won;You, Yong-Min
    • Journal of Magnetics
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    • v.19 no.3
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    • pp.273-281
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    • 2014
  • This paper presents an innovative design for a low-speed, direct-drive, axial-flux permanent-magnet (AFPM) generator with a coreless stator and rotor that is intended for application to small wind turbine power generation systems. The performance of the generator is evaluated and optimized by means of comprehensive 3D electromagnetic finite element analysis. The main focus of this study is to improve the power output and efficiency of wind power generation by investigating the electromagnetic and structural features of a coreless AFPM generator. The design is validated by comparing the performance achieved with a prototype. The results of our comparison demonstrate that the proposed generator has a number of advantages such as a simpler structure, higher efficiency over a wide range of operating speeds, higher energy yield, lighter weight and better power utilization than conventional machines. It would be possible to manufacture low-cost, axial-flux permanent-magnet generators by further developing the proposed design.

A Sensitivity and Performance Analysis for Torque Mode Switching on 2MW Direct Drive Wind Turbine Generator (2MW급 직접구동형 풍력발전기의 풍황 민감도 및 토크모드 스위칭 성능 해석)

  • Rho, Joo-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.10
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    • pp.1455-1460
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    • 2014
  • Wind turbine generators were designed on general regulations of wind condition. At real situations, it could be different from the design conditions. There are many control methods and definitions of transient region, because an efficient wind turbine generator control logic is the important matter in generator performance and annual energy production at real conditions. In this document, the power generation sensitivity for wind speed and turbulence intensities was defined to know the sensitive transient region. Wind conditions are applied for the ranges of 7~10m/s mean wind speed and 14~20% turbulence intensity. The sensibility of HR-D86 wind generator was increased in transient region(8~10m/s) on power curve diagram through a torque control to a pitch control. And then GH-bladed simulations was performed for performance analysis of the torque mode switching in transient region on 2MW direct drive wind generator(HR-D86) which is designed IEC class II for onshore. Through the sensitivity and performance analysis, the sensitivity for real wind condition could be the performance index for an wind generator. And the torque mode switching in transient region can increase the mean power generation on HR-D86 wind turbine generator.

The Steady-State Characteristic Analysis of 2MW PMSG based Direct-Drive Offshore Wind Turbine (2MW급 해상용 영구자석 직접 구동형 풍력 발전기의 정상상태 특성 해석)

  • Shin, Pyungho;Choi, Jungchul;Yoo, Chul;Kim, Daejin;Kyong, Namho;Ko, Heesang
    • Journal of the Korean Solar Energy Society
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    • v.35 no.3
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    • pp.9-16
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    • 2015
  • In order to support various studies for assessment of onshore and offshore wind turbine system including foundations, the land-based version of 2MW PMSG direct drive wind turbine has been analyzed using HAWC2 that account for the coupled dynamics of the wind inflow, elasticity, and controls of the turbine. this work presents the steady-state response of the system and natural frequency of the first thirteen structure turbine modes as a function of wind speed. Rotor, generator speeds, pitch angle, power production, thrust force, deflections of tower and blade are compared for one case below and one case above the rated wind speed.

Real-Time Hardware Simulator for Grid-Tied PMSG Wind Power System

  • Choy, Young-Do;Han, Byung-Moon;Lee, Jun-Young;Jang, Gil-Soo
    • Journal of Electrical Engineering and Technology
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    • v.6 no.3
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    • pp.375-383
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    • 2011
  • This paper describes a real-time hardware simulator for a grid-tied Permanent Magnet Synchronous Generator (PMSG) wind power system, which consists of an anemometer, a data logger, a motor-generator set with vector drive, and a back-to-back power converter with a digital signal processor (DSP) controller. The anemometer measures real wind speed, and the data is sent to the data logger to calculate the turbine torque. The calculated torque is sent to the vector drive for the induction motor after it is scaled down to the rated simulator power. The motor generates the mechanical power for the PMSG, and the generated electrical power is connected to the grid through a back-to-back converter. The generator-side converter in a back-to-back converter operates in current control mode to track the maximum power point at the given wind speed. The grid-side converter operates to control the direct current link voltage and to correct the power factor. The developed simulator can be used to analyze various mechanical and electrical characteristics of a grid-tied PMSG wind power system. It can also be utilized to educate students or engineers on the operation of grid-tied PMSG wind power system.

DFIG Wind Power System with a DDPWM Controlled Matrix Converter

  • Lee, Ji-Heon;Jeong, Jong-Kyou;Han, Byung-Moon;Choi, Nam-Sup;Cha, Han-Ju
    • Journal of Electrical Engineering and Technology
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    • v.5 no.2
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    • pp.299-306
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    • 2010
  • This paper proposes a new doubly-fed induction generator (DFIG) system using a matrix converter controlled by direct duty ratio pulse-width modulation (DDPWM) scheme. DDPWM is a recently proposed carrier based modulation strategy for matrix converters which employs a triangular carrier and voltage references in a voltage source inverter. By using DDPWM, the matrix converter can directly and effectively generate rotor voltages following the voltage references within the closed control loop. The operation of the proposed DFIG system was verified through computer simulation and experimental works with a hardware simulator of a wind power turbine, which was built using a motor-generator set with vector drive. The simulation and experimental results confirm that a matrix converter with a DDPWM modulation scheme can be effectively applied for a DFIG wind power system.

A New Approach for Constant DC Link Voltage in a Direct Drive Variable Speed Wind Energy Conversion System

  • Jeevajothi, R.;Devaraj, D.
    • Journal of Electrical Engineering and Technology
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    • v.10 no.2
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    • pp.529-538
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    • 2015
  • Due to the high efficiency and compact mechanical structure, direct drive variable speed generators are used for power conversion in wind turbines. The wind energy conversion system (WECS) considered in this paper consists of a permanent magnet synchronous generator (PMSG), uncontrolled rectifier, dc-dc boost converter controlled with maximum power point tracking (MPPT) and adaptive hysteresis controlled voltage source inverter (VSI). For high utilization of the converter's power capability and stabilizing voltage and power flow, constant DC-link voltage is essential. Step and search MPPT algorithm which senses the rectified voltage ($V_{DC}$) alone and controls the same is used to effectively maximize the output power. The adaptive hysteresis band current control is characterized by fast dynamic response and constant switching frequency. With MPPT and adaptive hysteresis band current control in VSI, the DC link voltage is maintained constant under variable wind speeds and transient grid currents respectively.

Characteristics Analysis of a Direct-Drive AFPM Generator (직접 구동 AFPM 풍력발전기의 특성해석)

  • Seo, Young-Taek;Kim, Hyoung-Gil;Kong, Jeong-Sik;Kim, Chul-Ho;Oh, Chul-Soo
    • Proceedings of the KIEE Conference
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    • pp.687-689
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    • 2003
  • Recently, issues regarding environment and the diversification of dependence in oil are watched with keen interest. Wind power attracts most interest because of its high-energy efficiency with environment friendly functions. The paper discusses the development of a coreless axial-flux permanent magnet (AFPM) generator for a wind power system. Analyzed the Coreless AFPM generator by electromagnetic, and designed wind power generator with this. The 3 phase output of stator is rectified and fed to a common do link. The overall machine structure has high compactness and lightness, because of the lack of the iron core. The test results with a resistive load confirm the satisfactory operation of generator. Compared with conventional generator, the design has lower weight, lower Power loss and improved efficiency.

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A Study on Electromagnetic Structural Design of AFPM Generator for Urban Wind Turbine (도시형 풍력발전기용 AFPM 발전기의 전자기적 구조설계에 관한 연구)

  • Cho, Jun-Seok;Choi, Se-Kwon;Kim, Ju-Yong;Jung, Tae-Uk
    • Proceedings of the KIEE Conference
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    • pp.830_831
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    • 2009
  • Wind power system attracts most interest because of high-energy efficiency with environment-friendly. Small scale wind power applications requires a cost effective and mechanically simple generator in order to be a reliable energy source. The use of direct driven generators, instead of geared machines, reduces the number of drive components, which offers the opportunity to reduce costs and increases system reliability and efficiency. This paper presents the development of a coreless axial-flux permanent magnet(AFPM) generator for a urban wind power system. It is analyzed by electromagnetic simulation program Maxwell 3D

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