• Title/Summary/Keyword: Wind Energy Conversion System

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Optimal Design of a Direct-Drive Permanent Magnet Synchronous Generator for Small-Scale Wind Energy Conversion Systems

  • Abbasian, Mohammadali;Isfahani, Arash Hassanpour
    • Journal of Magnetics
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    • v.16 no.4
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    • pp.379-385
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    • 2011
  • This paper presents an optimal design of a direct-drive permanent magnet synchronous generator for a small-scale wind energy conversion system. An analytical model of a small-scale grid-connected wind energy conversion system is presented, and the effects of generator design parameters on the payback period of the system are investigated. An optimization procedure based on genetic algorithm method is then employed to optimize four design parameters of the generator for use in a region with relatively low wind-speed. The aim of optimization is minimizing the payback period of the initial investment on wind energy conversion systems for residential applications. This makes the use of these systems more economical and appealing. Finite element method is employed to evaluate the performance of the optimized generator. The results obtained from finite element analysis are close to those achieved by analytical model.

A Study of Wind Energy Conversion System by a Secondary Control Hydrostatic Transmission (2차측 제어 정유압 변속기를 이용한 풍력발전시스템에 관한 연구)

  • Do, H.T.;Ahn, K.K.
    • Journal of Drive and Control
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    • v.10 no.1
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    • pp.21-28
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    • 2013
  • Wind energy has been more and more important and contributive in the energy utilization of the world. This paper proposed a novel method for Wind Energy Conversion System (WECS), in which a secondary control hydrostatic transmission (SC-HST) with two hydraulic accumulators, were employed for wind energy conversion system. This approach can absorb the excessive power of turbine, keep the generator from over-speed and maintain the speed of generator in low speed of turbine. A PID controller was designed for speed control to track a predefined speed. The simulation results indicated that the speed of the generator was ensured with the relative error less than 2%; and the efficiency of the proposed system was 70.4%.

A Fuzzy Logic Controller Design for Maximum Power Extraction of Variable Speed Wind Energy Conversion System (가변 풍력발전 시스템의 최대출력 제어를 위한 Fuzzy 제어기 설계)

  • Kim Jae-gon;Huh Uk-youl;Kim Byung-yoon
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.53 no.11
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    • pp.753-759
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    • 2004
  • This paper presents a modeling and simulation of a fuzzy controller for maximum power extraction of a grid-connected wind energy conversion system with a link of a rectifier and an inverter. It discusses the maximum power control algorithm for a wind turbine and proposes, in a graphical form, the relationships of wind turbine output, rotor speed, power coefficient, tip-speed ratio with wind speed when the wind turbine is operated under the maximum power control. The control objective is to always extract maximum power from wind and transfer the power to the utility by controlling both the pitch angle of the wind turbine blades and the inverter firing angle. Pitch control method is mechanically complicated, but the control performance is better than that of the stall regulation method. The simulation results performed on MATLAB will show the variation of generator's rotor angle and rotor speed, pitch angle, and generator output.

Performance of PI Controller for Maximum Power Extraction of a Grid-Connected Wind Energy Conversion System (계통연계 풍력발전 시스템의 최대출력 제어를 위한 PI 제어기의 성능 분석)

  • No, Gyeong-Su;Ryu, Haeng-Su
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.51 no.8
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    • pp.391-397
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    • 2002
  • This paper presents a modeling and simulation of a PI controller for maximum power extraction of a grid-connected wind energy conversion system with a link of a rectifier and an inverter. It discusses the maximum power control algorithm fnr a wind turbine and proposes, in a graphical form, the relationships of wind turbine output, rotor speed, power coefficient, tip-speed ratio with wind speed when the wind turbine is operated under the maximum power control. The control objective is to always extract maximum power from wind and transfer the power to the utility by controlling both the Pitch angle of the wind turbine blades and the inverter firing angle. Pitch control method is mechanically complicated, but the control performance is better than that of the stall regulation method. The simulation results performed on MATLAB will show the variation of generator's rotor angle and rotor speed, pitch angle, and generator output.

PSCAD/EMTDC BASED MODELING AND ANALYSIS OF A GRID-CONNECTED VARIABLE SPEED WIND ENERGY CONVERSION SCHEME (계통연계형 가변속 풍력발전방식의 PSCAD/EMTDC 모의 및 해석)

  • 김슬기;김응상
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.8
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    • pp.413-419
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    • 2003
  • The paper presents a simulation model and analysis of a grid-connected variable speed wind energy conversion scheme (VSWECS) using the PSCAD/EMTDC software. The modeled system uses a variable speed drive, a fixed pitch angle, a synchronous generator as a wind generator and an AC-DC-AC conversion scheme, which facilitates the wind generation to efficiently operate under varying wind speed while connected to the distribution network. The power 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 magnitude of the terminal bus at a specific level. Aerodynamic models are applied for a wind turbine model. An simulation analysis of the scheme in terms of its responding to wind variations is also presented.

A Study on Oil Hydraulic Heat Generation System for Wind Energy Utilization (풍력에너지 이용을 위한 유압식 열변환 장치에 관한 연구)

  • Lee, Il-Young;Gong, Tae-Hee
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.31 no.4
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    • pp.402-412
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    • 1995
  • A new energy conversion system which converts wind energy directly to heat instead of transforming it to electric power beforehand is suggested in this study. The new energy conversion system is composed of two big parts divided by their functions. One of them is a wind turbine part, and another is the heat energy conversion part. The object of this study is confined only to the heat energy conversion part, so the wind turbine is replaced with an electric motor for the convenience of experiment. In the experimental process, pressure difference at the hydraulic pump, revolution speed of the hydraulic pump, temperature at a few points on the oil circuit and the water circuit are measured at time intervals of five minutes. And integral values of input energy to the system and stored energy in the system is investigated.

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Development of a Cross-flow Type Vertical Wind Power Generation System for Electric Energy Generation Using Convergent-Divergent Duct (축소-확대 유로에 적용한 횡류형 수직 풍력발전시스템의 개발)

  • Chung, Sang-Hoon;Chung, Kwang-Seop;Kim, Chul-Ho
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.23 no.8
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    • pp.543-548
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    • 2011
  • New concept of wind energy conversion system is proposed to increase the energy density at a given working space. The quality of wind for wind power generation is depend on its direction and speed. However, the quality is not good on land because wind direction is changeable all the time and the speed as well. The most popularly operated wind turbine system is an axial-flow free turbine. But its conversion efficiency is less than 30% and even less than 20% considering the operating time. In this research, a cross-flow type wind turbine system is proposed with a convergent-divergent duct system to accelerate the low speed wind at the inlet of the wind turbine. Inlet guide vane is also introduced to the wind turbine system to have continuous power generation under the change of wind direction. In here, the availability of wind energy generation is evaluated with the change of the size of the inlet guide vane and the optimum geometry of the turbine impeller blade was found for the innovative wind power generation system.

Stable Adaptive On-line Neural Control for Wind Energy Conversion System (풍력 발전 계통의 적응 신경망 제어기 설계)

  • Park, Jang-Hyun;Kim, Seong-Hwan;Jang, Young-Hak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.4
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    • pp.838-842
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    • 2011
  • This paper proposes an online adaptive neuro-controller for a wind energy conversion system (WECS) that is a highly nonlinear system intrinsically. In real application, to obtain exact system parameters such as power coefficient, many measuring instruments and implementations are required, which is very difficult to perform. This shortcoming can be avoided by introducing neural network in the controller design in this paper. The proposed adaptive neural control scheme using radial-basis function network (RBFN) needs no system parameters to meet control objectives. Combining derivative estimator for wind velocity, the whole closed-loop system is shown to be stable in the sense of Lyapunov.

A High Efficient Piezoelectric Windmill using Magnetic Force for Low Wind Speed in Wireless Sensor Networks

  • Yang, Chan Ho;Song, Yewon;Jhun, Jeongpil;Hwang, Won Seop;Hong, Seong Do;Woo, Sang Bum;Sung, Tae Hyun;Jeong, Sin Woo;Yoo, Hong Hee
    • Journal of the Korean Physical Society
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    • v.73 no.12
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    • pp.1889-1894
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    • 2018
  • An innovative small-scale piezoelectric energy harvester has been proposed to gather wind energy. A conventional horizontal-axis wind power generation has a low generating efficiency at low wind speed. To overcome this weakness, we designed a piezoelectric windmill optimized at low-speed wind. A piezoelectric device having high energy conversion efficiency is used in a small windmill. The maximum output power of the windmill was about 3.14 mW when wind speed was 1.94 m/s. Finally, the output power and the efficiency of the system were compared with a conventional wind power system. This work will be beneficial for the piezoelectric energy harvesting technology to be applied to the real world such as wireless sensor networks (WSN).

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

  • Kim, Seul-Ki;Kim, Eung-Sang
    • Proceedings of the KIEE Conference
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    • 2002.11d
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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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