• Title/Summary/Keyword: Rated wind speed

Search Result 97, Processing Time 0.029 seconds

Design of Speed Controller for Stall Blade Wind Turbine Complying with the Speed Limit During Speed Overshoot (속도 오버슈트 발생 시 제한 속도를 초과하지 않는 실속형 블레이드 풍력터빈의 속도제어기 설계)

  • Kim, Ye-Chan;Song, Seung-Ho
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.27 no.5
    • /
    • pp.438-445
    • /
    • 2022
  • Blade efficiency decreases when the rotor speed is kept constant even though the wind speed is higher than the rated value. Therefore, a speed controller is used to regulate the rotor speed in the high-wind-speed region. In stall-blade wind turbine, the role of the speed controller is important because precise aerodynamic regulation is unavailable. In this study, an effective parameter design method of a PI speed controller is proposed to limit the speed overshoot of a type 4 wind turbine with stall blades even though wind gust occurs. The proposed method considers the efficiency characteristics of the stall blade and the mechanical inertia of the wind turbine rotor. It determines the bandwidth of the speed controller to comply with the speed limit during generator speed overshoot for the worst case of wind gust. The proposed method is verified through intensive simulations with a MATLAB/SIMULINK model and experimental results obtained using a 3 kW MG set of wind turbine simulator.

Development of the Furling Control Type Small Wind Turbine System (과풍속 출력 제한형 소형 풍력 발전장치 개발)

  • Choi, Young-Chul;Kim, Chul-Ho;Lee, Hyun-Chae;Seo, Young-Taek;Han, Young-Oun;Song, Jung-Il
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.29 no.6
    • /
    • pp.693-701
    • /
    • 2012
  • In this study, a small wind turbine airfoil specialized for national wind condition was designed in order to develop the furling control type HAWT. And then a flow analysis was carried out based on the blade drawing which was designed to characterize of the developed airfoil. The result of the flow analysis showed that the torque on the 3 blades was 180.23N.m. This is equivalent to an output power of 5.66kw and an output efficiency of 0.44. Then we produced and constructed a 3kW - furling control type HAWT by getting the system unit design technology such as the specialized furling control device. By operating this turbine, we could get 3kW of the rated power at a wind speed of 10.5m/s through the ability test. Cut-in wind speed was 2m/s, generator efficiency was 92% at the rated power output. Sound power level was 87.2dB(A). Also we observed that the output power was limited to 10.5m/s with furling system operation.

Wind Estimation Power Control using Wind Turbine Power and Rotor speed (풍력터빈의 출력과 회전속도를 이용한 풍속예측 출력제어)

  • Ko, Seung-Youn;Kim, Ho-Chan;Huh, Jong-Chul;Kang, Min-Jae
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.17 no.4
    • /
    • pp.92-99
    • /
    • 2016
  • A wind turbine is controlled for the purpose of obtaining the maximum power below its rated wind speed. Among the methods of obtaining the maximum power, TSR (Tip Speed Ratio) optimal control and P&O (Perturbation and Observation) control are widely used. The P&O control algorithm using the turbine power and rotational speed is simple, but its slow response is a weak point. Whereas TSR control's response is fast, it requires the precise wind speed. A method of measuring or estimating the wind speed is used to obtain a precise value. However, estimation methods are mostly used, because it is difficult to avoid the blade interference when measuring the wind speed near the blades. Neural networks and various numerical methods have been applied for estimating the wind speed, because it involves an inverse problem. However, estimating the wind speed is still a difficult problem, even with these methods. In this paper, a new method is introduced to estimate the wind speed in the wind-power graph by using the turbine power and rotational speed. Matlab/Simulink is used to confirm that the proposed method can estimate the wind speed properly to obtain the maximum power.

A Study on the Cuf-off Speed of Small-scale Wind Power System for Battery Charging (배터리 충전을 위한 소형풍력 발전 시스템의 한계 풍속에 관한 연구)

  • Ku, Hyun-Keun;Lee, Hyung-Uk;Kim, Jang-Mok
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.63 no.4
    • /
    • pp.484-489
    • /
    • 2014
  • Three phase PWM(Pulse Width Modulation) converter of the small-scale wind power system is able to charge battery under the rated wind speed regions. However, it is impossible to control output power of converter at the over win speed region because back-EMF(Electro Motive Force) of PMSG(Permanent Magnet Synchronous Generator) is higher than the battery terminal voltage of PMSG is reduced. However, the cut-off wind speed exists although battery charging algorithm is implemented by flux weakening control method. Therefore, this paper performs analysis of other factors which affects limitation wind speed. The validity of the analysis are verified through simulation.

Maximum Power Tracking Control for parallel-operated DFIG Based on Fuzzy-PID Controller

  • Gao, Yang;Ai, Qian
    • Journal of Electrical Engineering and Technology
    • /
    • v.12 no.6
    • /
    • pp.2268-2277
    • /
    • 2017
  • As constantly increasing wind power penetrates power grid, wind power plants (WPPs) are exerting a direct influence on the traditional power system. Most of WPPs are using variable speed constant frequency (VSCF) wind turbines equipped with doubly fed induction generators (DFIGs) due to their high efficiency over other wind turbine generators (WTGs). Therefore, the analysis of DFIG has attracted considerable attention. Precisely measuring optimum reference speed is basis of utilized maximum wind power in electric power generation. If the measurement of wind speed can be easily taken, the reference of rotation speed can be easily calculated by known system's parameters. However, considering the varying wind speed at different locations of blade, the turbulence and tower shadow also increase the difficulty of its measurement. The aim of this study is to design fuzzy controllers to replace the wind speedometer to track the optimum generator speed based on the errors of generator output power and rotation speed in varying wind speed. Besides, this paper proposes the fuzzy adaptive PID control to replace traditional PID control under rated wind speed in variable-pitch wind turbine, which can detect and analyze important aspects, such as unforeseeable conditions, parameters delay and interference in the control process, and conducts online optimal adjustment of PID parameters to fulfill the requirement of variable pitch control system.

Design of Linear Pitch Controller in Wind Turbine under the condition of Varying Operating Points (동작점 변화 조건에서의 풍력터빈 선형 피치제어기 설계)

  • Cheon, Jongmin;Kim, Choonkyoung;Lee, Joohoon;Hong, Jitae;Kwon, Soonman
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2011.11a
    • /
    • pp.40.1-40.1
    • /
    • 2011
  • This paper presents a pitch controller which can hold output power constant at the rated value. Although wind turbine contains complicated nonlinearities, its behaviour within a certain operating range of a point can be approximated by that of a linear model. By doing so, we can apply rather simple and systematic linear control techniques such as PID and LQR(Linear Quadratic Regulator) to design a linear pitch controller. Because these linear controllers are valid only in a sufficiently small range around an operating point, linearized wind turbine model under the condition of varying wind speed needs a linear pitch controller can achieve the aims of tracking the rated rotor rotational speed. We propose an improved linear pitch controller taking each merit of LQR and PI controller under the condition of varying operating points in this paper.

  • PDF

Rotor Blade Design of a 1MW Class HAWT and Evaluation of Aerodynamic Performance Using CFD Method (1MW급 수평축 풍력터빈 로터 블레이드 설계 및 CFD에 의한 공력성능 평가)

  • Mo, Jang-Oh;Lee, Young-Ho
    • The KSFM Journal of Fluid Machinery
    • /
    • v.15 no.1
    • /
    • pp.21-26
    • /
    • 2012
  • In this investigation, the aerodynamic performance evaluation of a 1MW class blade has been performed with the purpose of the verification of target output and its clear understanding of flow field using CFD commercial code, ANSYS FLUENT. Before making progress of CFD analysis the HERACLES V2.0 software based on blade element momentum theory was applied for confirmation of quick and approximate performance in the preliminary stage. The blade was designed to produce the target output of a 1MW class at a rated wind speed of 12m/s, which consists of five different airfoils such as FFA W-301, DU91-W250, DU93-W-210, NACA 63418 and NACA 63415 from hub to tip. The mechanical power by CFD is approximately 1.195MW, which is converted into the electrical power of 1.075MW if the system loss is considered to be 0.877.

Power Regulation of Variable Speed Wind Turbines using Pitch Control based on Disturbance Observer

  • Joo, Young-Jun;Back, Ju-Hoon
    • Journal of Electrical Engineering and Technology
    • /
    • v.7 no.2
    • /
    • pp.273-280
    • /
    • 2012
  • Most variable speed wind turbines have pitch control mechanisms and one of their objectives is to protect turbines when the wind speed is too high. By adjusting pitch angles of wind turbine, the inlet power and the torque developed by the turbine are regulated. In this paper, the difference between the real wind speed and its rated value is regarded as a disturbance, and a component called disturbance observer (DOB) is added to the pre-designed control loop. The additional DOB based controller estimates the disturbance and generates a compensating signal to suppress the effect of disturbance on the system. As a result, the stability and the performance of the closed loop system guaranteed by an outer-loop controller (designed for a nominal system without taking into account of disturbances) are approximately recovered in the steady state. Simulation results are presented to verify the performance of the proposed control scheme.

Feedforward Pitch Control Using Wind Speed Estimation

  • Nam, Yoon-Su;Kim, Jeong-Gi;Paek, In-Su;Moon, Young-Hwan;Kim, Seog-Joo;Kim, Dong-Joon
    • Journal of Power Electronics
    • /
    • v.11 no.2
    • /
    • pp.211-217
    • /
    • 2011
  • The dynamic response of a multi-MW wind turbine to a sudden change in wind speed is usually slow, because of the slow pitch control system. This could cause a large excursion of the rotor speed and an output power over the rated. A feedforward pitch control can be applied to minimize the fluctuations of these parameters. This paper introduces the complete design steps for a feedforward pitch controller, which consist of three stages, i.e. the aerodynamic torque estimation, the 3-dimensional lookup table for the wind seed estimation, and the calculation of the feedforward pitch amount. The effectiveness of the feedforward control is verified through numerical simulations of a multi-MW wind turbine.

Aero-elastic coupled numerical analysis of small wind turbine-generator modelling

  • Bukala, Jakub;Damaziak, Krzysztof;Karimi, Hamid Reza;Malachowski, Jerzy
    • Wind and Structures
    • /
    • v.23 no.6
    • /
    • pp.577-594
    • /
    • 2016
  • In this paper a practical modelling methodology is presented for a series of aero- servo- elastic- coupled numerical analyses of small wind turbine operation, with particular emphasis on variable speed generator modelling in various wind speed conditions. The following characteristics are determined using the available computer tools: the tip speed ratio as a function of the generator constant (under the assumption of constant wind speed), the turbine coefficient of power as a function of the tip speed ratio (the torque curve is modified accordingly and generator speed and power curves are plotted), turbine power curves and coefficient of power curve as functions of the incoming wind speed. The last stage is to determine forces and torques acting on rotor blades and turbine tower for specific incoming wind speeds in order to examine the impact of the stall phenomena on these values (beyond the rated power of the turbine). It is shown that the obtained results demonstrate a valuable guideline for small wind turbines design process.