The effects of variable wind speed and drive train component efficiencies on wind turbine energy capture

1997 ◽  
Author(s):  
L. Fingersh ◽  
M. Robinson ◽  
L. Fingersh ◽  
M. Robinson
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Drive Train ◽  
Energy Capture ◽  
Variable Wind

scholarly journals Remaining Useful Life Estimation of Wind Turbine Blades under Variable Wind Speed Conditions Using Particle Filters

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Bhavana Valeti ◽  
Shamim N. Pakzad
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Remaining Useful Life ◽  
Structural Components ◽  
Wind Turbine Blades ◽  
Average Wind Speed ◽  
Average Wind ◽  
Useful Life ◽  
Variable Wind

Rotor blades are the most complex structural components in a wind turbine and are subjected to continuous cyclic loads of wind and self-weight variation. The structural maintenance operations in wind farms are moving towards condition based maintenance (CBM) to avoid premature failures. For this, damage prognosis with remaining useful life (RUL) estimation in wind turbine blades is necessary. Wind speed variation plays an important role influencing the loading and consequently the RUL of the structural components. This study investigates the effect of variable wind speed between the cutin and cut-out speeds of a typical wind farm on the RUL of a damage detected wind turbine blade as opposed to average wind speed assumption. RUL of wind turbine blades are estimated for different initial crack sizes using particle filtering method which forecasts the evolution of fatigue crack addressing the non-linearity and uncertainty in crack propagation. The stresses on a numerically simulated life size onshore wind turbine blade subjected to the above wind speed loading cases are used in computing the crack propagation observation data for particle filters. The effects of variable wind speed on the damage propagation rates and RUL in comparison to those at an average wind speed condition are studied and discussed.

The Rotor Speed Control of 5MW Wind Turbine under Rated Wind Speed Using Adaptive-PID Controller

2012 ◽  
Vol 229-231 ◽  
pp. 2323-2326
Author(s):  
Zong Qi Tan ◽  
Can Can Li ◽  
Hui Jun Ye ◽  
Yu Qiong Zhou ◽  
Hua Ling Zhu
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Pid Controller ◽  
Turbine Rotor ◽  
Speed Ratio ◽  
Rotor Speed ◽  
Rotating Speed ◽  
Tip Speed Ratio ◽  
Variable Wind ◽  
Wind Turbine Rotor

This paper designed the controller of the wind turbine rotor rotating speed. This model of adaptive-PID through control the tip-speed ratio and count the values of PID for variable wind speed. From the result of simulation, the wind speed can run in a good dynamic characteristic, and keep the rotor running in the best tip-speed ratio at the same time.

scholarly journals Load Mitigation and Optimal Power Capture for Variable Speed Wind Turbine in Region 2

2015 ◽  
Vol 2015 ◽  
pp. 1-10
Author(s):  
Saravanakumar Rajendran ◽  
Debashisha Jena
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Sliding Mode ◽  
Drive Train ◽  
Variable Speed ◽  
Terminal Sliding Mode ◽  
Static State ◽  
Variable Speed Wind Turbine ◽  
Power Capture ◽  
Speed Estimator

This paper proposes the two nonlinear controllers for variable speed wind turbine (VSWT) operating at below rated wind speed. The objective of the controller is to maximize the energy capture from the wind with reduced oscillation on the drive train. The conventional controllers such as aerodynamic torque feedforward (ATF) and indirect speed control (ISC) are adapted initially, which introduce more power loss, and the dynamic aspects of WT are not considered. In order to overcome the above drawbacks, modified nonlinear static state with feedback estimator (MNSSFE) and terminal sliding mode controller (TSMC) based on Modified Newton Raphson (MNR) wind speed estimator are proposed. The proposed controllers are simulated with nonlinear FAST (fatigue, aerodynamics, structures, and turbulence) WT dynamic simulation for different mean wind speeds at below rated wind speed. The frequency analysis of the drive train torque is done by taking the power spectral density (PSD) of low speed shaft torque. From the result, it is found that a trade-off is to be maintained between the transient load on the drive train and maximum power capture.

Unintended Stalling of the USW 56-100 During Optimum Pitch Control Operation

1994 ◽  
Vol 116 (3) ◽  
pp. 153-157
Author(s):  
G. McNerney
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Pitch Angle ◽  
Blade Angle ◽  
Control Logic ◽  
Control Operation ◽  
Energy Capture ◽  
Pitch Control ◽  
Power Regulation ◽  
The U.S

The U.S. Windpower 56-100 is a three-bladed, free yaw wind turbine, using full span blade pitch control for power regulation. It is theoretically possible to increase the energy capture of the 56-100 by adjusting the blade angle to the optimum pitch angle on a continuing basis at below rated speeds. This concept was field tested on the 56-100, but it was found that the optimum pitch control logic opens a pathway for the 56-100 to fall into stall operation when the winds are above the rated wind speed. The 56-100 then operates as a stall-regulated wind turbine with an overall reduction of energy capture and an increase in system loads.

Simulation of a Fixed Pitch Wind Turbine Powered Induction Generator in EMTP

1994 ◽  
Vol 31 (4) ◽  
pp. 362-374 ◽  
Author(s):  
J. Perahia ◽  
C. V. Nayar
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Model Performance ◽  
Drive Train ◽  
Electromagnetic Transients ◽  
Induction Generator ◽  
Turbine Drive ◽  
Fixed Pitch

Simulation of a fixed pitch wind turbine powered induction generator in EMTP Described are two models of a fixed pitch wind turbine drive train coupled to an induction generator compatible with the Electromagnetic Transients Program (EMTP). The models require wind speed or turbine torque changes. Model performance is studied on a 30 kW commercial arrangement.

Optimizing Energy Capture of Cascaded Wind Turbine Array With Nested-Loop Extremum Seeking Control

2015 ◽  
Vol 137 (12) ◽  
Author(s):  
Zhongzhou Yang ◽  
Yaoyu Li ◽  
John E. Seem
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Simulation Study ◽  
Wind Farm ◽  
Extremum Seeking ◽  
Power Coefficient ◽  
Extremum Seeking Control ◽  
Energy Capture ◽  
Principle Of Optimality ◽  
Nested Loop

This paper proposes a nested-loop extremum seeking control (NLESC) scheme for optimizing the energy capture of wind farm that is formed by a wind turbine array along the prevailing wind direction. It has been shown in earlier work that the axial induction factors of individual wind turbines can be optimized from downstream to upstream units in a sequential manner, which is a spatial domain analogy to the principle of optimality in dynamic programing. Therefore, it is proposed to optimize the turbine operation by a nested-loop optimization framework from the downstream to upstream turbines, based on feedback of the power of the immediate turbine and its downstream units. The extremum seeking control (ESC) based on dither–demodulation scheme is selected as a model-free real-time optimization solution for the individual loops. First, the principle of optimality for optimizing wind farm energy capture is proved for the cascaded wind turbine array based on the disk model. Analysis shows that the optimal torque gain of each turbine in a cascade of turbines is invariant with wind speed if the wind direction does not change. Then, the NLESC scheme is proposed, with the array power coefficient selected as the performance index to be optimized in real-time. As changes of upstream turbine operation affect downstream turbines with significant delays due to wind propagation, a cross-covariance based delay estimate is used to improve the determination of the array power coefficient. The proposed scheme is evaluated with simulation study using a three-turbine wind farm with the simwindfarm simulation platform. Simulation study is performed under both smooth and turbulent winds, and the results indicate the convergence to the actual optimum. Also, simulation under different wind speeds supports the earlier analysis results that the optimal torque gains of the cascaded turbines are invariant to wind speed.

scholarly journals A New Fault Diagnosis Algorithm for PMSG Wind Turbine Power Converters under Variable Wind Speed Conditions

Energies ◽  
2016 ◽  
Vol 9 (7) ◽  
pp. 548 ◽  
Author(s):  
Yingning Qiu ◽  
Hongxin Jiang ◽  
Yanhui Feng ◽  
Mengnan Cao ◽  
Yong Zhao ◽  
...  
Keyword(s):  
Fault Diagnosis ◽  
Wind Speed ◽  
Wind Turbine ◽  
Power Converters ◽  
Diagnosis Algorithm ◽  
Variable Wind
Sign in / Sign up

Export Citation Format

Share Document