scholarly journals Twin-Rotor Wind Turbine Power Performance Compared to a Single-Rotor of the Same Tip-to-Tip Spacing

2021 ◽  
Vol 7 ◽  
pp. 323-328
Author(s):  
Mohamed Adel ◽  
Khalid Hisham ◽  
Mahmoud Osama ◽  
Adel Awwad ◽  
Abdelrahman Mohamed ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Power Performance ◽  
Twin Rotor

scholarly journals Effect of Pitch Parameters on Aerodynamic Forces of a Straight-Bladed Vertical Axis Wind Turbine with Inclined Pitch Axes

2021 ◽  
Vol 11 (3) ◽  
pp. 1033
Author(s):  
Jia Guo ◽  
Timing Qu ◽  
Liping Lei
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Speed Ratio ◽  
Incline Angle ◽  
Asymmetric Distribution ◽  
Vertical Axis Wind Turbine ◽  
Power Performance ◽  
Aerodynamic Forces ◽  
Ansys Fluent ◽  
Pitch Regulation

Pitch regulation plays a significant role in improving power performance and achieving output control in wind turbines. The present study focuses on a novel, pitch-regulated vertical axis wind turbine (VAWT) with inclined pitch axes. The effect of two pitch parameters (the fold angle and the incline angle) on the instantaneous aerodynamic forces and overall performance of a straight-bladed VAWT under a tip-speed ratio of 4 is investigated using an actuator line model, achieved in ANSYS Fluent software and validated by previous experimental results. The results demonstrate that the fold angle has an apparent influence on the angles of attack and forces of the blades, as well as the power output of the wind turbine. It is helpful to further study the dynamic pitch regulation and adaptable passive pitch regulation of VAWTs. Incline angles away from 90° lead to the asymmetric distribution of aerodynamic forces along the blade span, which results in an expected reduction of loads on the main shaft and the tower of VAWTs.

scholarly journals A Power Performance Online Assessment Method of a Wind Turbine Based on the Probabilistic Area Metric

2020 ◽  
Vol 10 (9) ◽  
pp. 3268
Author(s):  
Zhao Xiao ◽  
Qiancheng Zhao ◽  
Xuebing Yang ◽  
AnFeng Zhu
Keyword(s):  
Wind Turbine ◽  
Spatial Clustering ◽  
Principal Component ◽  
Assessment Method ◽  
Online Assessment ◽  
Power Performance ◽  
Operation Rules ◽  
Area Metric ◽  
Control Command ◽  
Power Curves

This paper presents an approach for creating online assessment power curves by calculating the variations between the baseline and actual power curves. The actual power curve is divided into two regions based on the operation rules of a wind turbine, and the regions are individually assessed. The raw data are filtered using the control command, and outliers are detected using the density-based spatial clustering of applications with noise clustering method. The probabilistic area metric is applied to quantify the variations of the two power curves in the two regions. Based on this result, the variation in the power curves can be calculated, and the results can be used to dynamically evaluate the power performance of a wind turbine. The proposed method is verified against the derivation of secondary principal component method and traditional statistical methods. The potential applications of the proposed method in wind turbine maintenance activities are discussed.

Small Wind Turbine Power Performance Testing with Uncertainty Analysis

2014 ◽  
Vol 875-877 ◽  
pp. 1944-1948
Author(s):  
Wen Lei Bai ◽  
Byun Gik Chang ◽  
Gerald Chen ◽  
Ken Starcher ◽  
David Carr ◽  
...  
Keyword(s):  
Wind Speed ◽  
Uncertainty Analysis ◽  
Wind Turbine ◽  
Performance Testing ◽  
Air Pressure ◽  
Power Performance ◽  
Small Wind Turbine ◽  
Uncertainty Sources ◽  
Measurement Uncertainties

Wind turbine power performance testing consists of power, temperature, air pressure and wind speed measurements collected for this study during which measuring uncertainties are involved. Due to the measurement uncertainties, the results of power performance testing are affected; therefore, it is necessary to consider the measurement uncertainties for evaluating the accuracy of turbine testing. For this purpose of this study, uncertainty analysis for one 5kW wind turbine power performance testing was conducted. The results of uncertainty analysis indicated that the uncertainty negatively affected the validity of conclusions drawn from power performance testing, and the uncertainty sources are various in different wind speed bins.

scholarly journals Requirements for Validation of Dynamic Wind Turbine Models: An International Grid Code Review

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1707
Author(s):  
Raquel Villena-Ruiz ◽  
Andrés Honrubia-Escribano ◽  
Francisco Jiménez-Buendía ◽  
Ángel Molina-García ◽  
Emilio Gómez-Lázaro
Keyword(s):  
Power Systems ◽  
Wind Turbine ◽  
Wind Power ◽  
Environmental Sustainability ◽  
Power Plants ◽  
Simulation Models ◽  
System Stability ◽  
Power Performance ◽  
National Network ◽  
Power Installations

Wind power is positioned as one of the fastest-growing energy sources today, while also being a mature technology with a strong capacity for creating employment and guaranteeing environmental sustainability. However, the stochastic nature of wind may affect the integration of power plants into power systems and the availability of generation capacity. In this sense, as in the case of conventional power plants, wind power installations should be able to help maintain power system stability and reliability. To help achieve this objective, a significant number of countries have developed so-called grid interconnection agreements. These are designed to define the technical and behavioral requirements that wind power installations, as well as other power plants, must comply with when seeking connection to the national network. These documents also detail the tasks that should be conducted to certify such installations, so these can be commercially exploited. These certification processes allow countries to assess wind turbine and wind power plant simulation models. These models can then be used to estimate and simulate wind power performance under a variety of scenarios. Within this framework, and with a particular focus on the new Spanish grid code, the present paper addresses the validation process of dynamic wind turbine models followed in three countries—Spain, Germany and South Africa. In these three countries, and as a novel option, it has been proposed that these models form part of the commissioning and certification processes of wind power plants.

scholarly journals A Comparative Study on Primary Bearing Rating Life of a 5-MW Two-Blade Wind Turbine System Based on Two Different Control Domains

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2607
Author(s):  
Koo ◽  
Jung
Keyword(s):  
Life Span ◽  
Wind Turbine ◽  
Power Level ◽  
Aerodynamic Load ◽  
Power Performance ◽  
Pitch Control ◽  
Average Value ◽  
Wind Speeds ◽  
Wind Turbine System ◽  
Bearing Life

Recently, the importance of individual pitch control (IPC) capability in wind turbine systems has been emphasized to achieve the desired power performance and mitigate the aerodynamic imbalance load for the mechanical integrity. Compared to collective pitch control(CPC), which assigns identical pitch angles for all employed blades, IPC is capable of generating other various sets of pitch angles to manipulate the aerodynamic load. Thus, the mechanical elements of wind turbine systems may take advantages from this variation, which allows wind turbines to have lighter designs and longer lifetimes. One of the essential mechanical components in the wind turbine is a primary bearing supporting the blades–rotor–shaft unit, which has not been fully investigated yet among the structural elements in the wind turbine system. In this regard, this research focuses on predicting the bearing life span of a NACA64-A17 two-blade 5-MW wind turbine system for the domains of allowable individual pitch angles by IPC. In particular, under the effect of various wind speeds, a bearing life span was determined based on the average value of load cases—satisfying both appropriate power level and the allowable domain of pitch control angles, which were possibly conveyed by IPC—and the result was compared with the bearing life predicted based on the domain of pitch angles, as generated by the CPC strategy. Consequently, in the ranges of high wind speeds, it was found that the average applied load to the bearing is reduced under the domain of the IPC-based pitch angle, resulting in possibly increasing the life span of the bearing. With the presented results, it is hoped that this work will provide important insights for those that majorly concern designing the primary bearing of the IPC-based wind turbine system.

scholarly journals A numerical study of Vertical Axis Wind Turbine performances in twin-rotor configurations

2020 ◽  
Vol 1618 ◽  
pp. 052012
Author(s):  
M Guilbot ◽  
S Barre ◽  
G Balarac ◽  
C Bonamy ◽  
N Guillaud
Keyword(s):  
Wind Turbine ◽  
Numerical Study ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Twin Rotor

scholarly journals Variable Size Twin-Rotor Wind Turbine

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2543 ◽  
Author(s):  
Piotr Doerffer ◽  
Krzysztof Doerffer ◽  
Tomasz Ochrymiuk ◽  
Janusz Telega
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Efficient Operation ◽  
Turbine Efficiency ◽  
Small Wind Turbines ◽  
Strong Winds ◽  
New Feature ◽  
The Cost ◽  
Twin Rotor

The paper presents a new concept of a vertical axis wind turbine. The idea is focused on small wind turbines, and therefore, the dominating quality is safety. Another important necessary feature is efficient operation at small winds. This implies an application of the drag driven solution such as the Savonius rotor. The presented concept is aimed at reducing the rotor size and the cost of implementation. A new wind turbine solution, its efficiency, and functionality are described. The results of numerical simulations being a proof of the concept are reported. The simulations were followed by wind tunnel tests. Finally several prototypes were built and investigated for a longer period of time. The new wind turbine concept has undergone various testing and implementation efforts, making this idea matured, well proven and documented. A new feature, namely, the wind turbine size reduction at strong winds, or in other words, an increase in the wind turbine size at low winds is the reason why it is difficult to compare this turbine with other turbines on the market. The power output depends not only on the turbine efficiency but also on its varying size.

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