scholarly journals Assessing the Factors Impacting on the Reliability of Wind Turbines via Survival Analysis—A Case Study

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3034 ◽  
Author(s):  
Samet Ozturk ◽  
Vasilis Fthenakis ◽  
Stefan Faulstich
Keyword(s):  
Survival Analysis ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Direct Drive ◽  
Maintenance Costs ◽  
Electrical Systems ◽  
Geographical Factors ◽  
History Of ◽  
Risk Rate

The failure of wind turbines is a multi-faceted problem and its monetary impact is often unpredictable. In this study, we present a novel application of survival analysis on wind turbine reliability, including accounting for previous failures and the history of scheduled maintenance. We investigated the operational, climatic and geographical factors that affect wind turbine failure and modeled the risk rate of wind turbine failure based on data from 109 turbines in Germany operating for a period of 19 years. Our analysis showed that adequately scheduled maintenance can increase the survival of wind turbine systems and electric subsystems up to 2.8 and 3.8 times, respectively, compared to the systems without scheduled maintenance. Geared-drive wind turbines and their electrical systems were observed to have 1.2- and 1.4- times higher survival, respectively, compared to direct-drive turbines and their electrical systems. It was also found that the survival of frequently-failing wind turbine components, such as switches, was worse in geared-drive than in direct-drive wind turbines. We show that survival analysis is a useful tool to guide the reduction of the operating and maintenance costs of wind turbines.

scholarly journals Assessing Factors Impacting on Reliability of Wind Turbines by Use of Survival Analysis – A Case Study

2018 ◽  
Author(s):  
Samet Ozturk ◽  
Vasilis Fthenakis ◽  
Stefan Faulstich
Keyword(s):  
Survival Analysis ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Direct Drive ◽  
Maintenance Costs ◽  
Electrical Systems ◽  
History Of ◽  
Risk Rate ◽  
Reliability Performance

Failure of wind turbines is a multi-faceted problem and its monetary impact is often unpredicted. In this study, we present a novel application of survival analysis on wind turbine reliability performance that includes accounting of previous failures and history of scheduled maintenance. We investigate the operational, climatic and geographical factors which affect wind turbine failures and model the risk rate of wind turbine failures based on data from 109 turbines in Germany operating during a period of 19 years.  Our analysis showed that adequately scheduled maintenance can increase the survivorship of wind turbine systems and electric subsystems up to 2.8 and 3.8 times, respectively compared to the ones without scheduled maintenance. Geared-drive wind turbines and their electrical systems were observed to have 1.2- and 1.4-times higher survivorship, respectively, compared to direct-drive turbines and their electrical systems. It is also found that survivorship of frequently-failed wind turbine components, such as switches, is worse in geared-drive than in direct-drive wind turbines. We show that survival analysis is a useful tool for guiding the reduction of operating and maintenance costs of wind turbines.

scholarly journals Selection of Wind Turbine Based on Fuzzy Analytic Network Process: A Case Study in China

2021 ◽  
Vol 13 (4) ◽  
pp. 1792
Author(s):  
Nansheng Pang ◽  
Mengfan Nan ◽  
Qichen Meng ◽  
Siyang Zhao
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Evaluation System ◽  
Comprehensive Evaluation ◽  
Analytic Network Process ◽  
Indicator System ◽  
Triangular Fuzzy Number ◽  
Direct Drive ◽  
Network Process

Wind turbine selection is an evaluation problem involving many factors, such as technology, economy, society, etc., and there exist internal dependencies and circular relationships among these factors. This increases the complexity of the selection problem. At the same time, with the development of wind power technology, the types of wind turbines on the market are increasing. Therefore, it is necessary to establish a scientific and comprehensive evaluation system to guide the selection work. This paper extends the traditional indicator system, selecting a total of twelve evaluation indicators from three aspects: operation reliability, economy, and supplier cooperation. The selected indicators are defined in detail to clarify the relationship between them. Then the triangular fuzzy number is introduced to accurately reflect the preference information obtained from experts, and a fuzzy analytical network process (FANP) model for wind turbine unit selection is constructed by combining fuzzy preference programming (FPP) with analytic network process (ANP). In the end, a case study in China is carried out. Results show that the 2.5 W unit produced by Goldwind obtains the best comprehensive evaluation value, which is consistent with the expanding market share permanent magnet direct-drive wind turbines. This paper could provide references for future wind turbine selection questions.

scholarly journals Improving the Strategy of Maintaining Offshore Wind Turbines through Petri Net Modelling

2021 ◽  
Vol 11 (2) ◽  
pp. 574
Author(s):  
Rundong Yan ◽  
Sarah Dunnett
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Petri Net ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Maintenance Costs ◽  
Offshore Wind Turbines ◽  
Major Repair ◽  
Wind Turbine System ◽  
Periodic Maintenance

In order to improve the operation and maintenance (O&M) of offshore wind turbines, a new Petri net (PN)-based offshore wind turbine maintenance model is developed in this paper to simulate the O&M activities in an offshore wind farm. With the aid of the PN model developed, three new potential wind turbine maintenance strategies are studied. They are (1) carrying out periodic maintenance of the wind turbine components at different frequencies according to their specific reliability features; (2) conducting a full inspection of the entire wind turbine system following a major repair; and (3) equipping the wind turbine with a condition monitoring system (CMS) that has powerful fault detection capability. From the research results, it is found that periodic maintenance is essential, but in order to ensure that the turbine is operated economically, this maintenance needs to be carried out at an optimal frequency. Conducting a full inspection of the entire wind turbine system following a major repair enables efficient utilisation of the maintenance resources. If periodic maintenance is performed infrequently, this measure leads to less unexpected shutdowns, lower downtime, and lower maintenance costs. It has been shown that to install the wind turbine with a CMS is helpful to relieve the burden of periodic maintenance. Moreover, the higher the quality of the CMS, the more the downtime and maintenance costs can be reduced. However, the cost of the CMS needs to be considered, as a high cost may make the operation of the offshore wind turbine uneconomical.

scholarly journals Impact of Typhoons on Floating Offshore Wind Turbines: A Case Study of Typhoon Mangkhut

2021 ◽  
Vol 9 (5) ◽  
pp. 543
Author(s):  
Jiawen Li ◽  
Jingyu Bian ◽  
Yuxiang Ma ◽  
Yichen Jiang
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Safety Evaluation ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Motion Response ◽  
Offshore Wind Turbines ◽  
Floating Offshore Wind Turbines ◽  
Coupling Motion

A typhoon is a restrictive factor in the development of floating wind power in China. However, the influences of multistage typhoon wind and waves on offshore wind turbines have not yet been studied. Based on Typhoon Mangkhut, in this study, the characteristics of the motion response and structural loads of an offshore wind turbine are investigated during the travel process. For this purpose, a framework is established and verified for investigating the typhoon-induced effects of offshore wind turbines, including a multistage typhoon wave field and a coupled dynamic model of offshore wind turbines. On this basis, the motion response and structural loads of different stages are calculated and analyzed systematically. The results show that the maximum response does not exactly correspond to the maximum wave or wind stage. Considering only the maximum wave height or wind speed may underestimate the motion response during the traveling process of the typhoon, which has problems in guiding the anti-typhoon design of offshore wind turbines. In addition, the coupling motion between the floating foundation and turbine should be considered in the safety evaluation of the floating offshore wind turbine under typhoon conditions.

scholarly journals Simultaneous Inertia Contribution and Optimal Grid Utilization with Wind Turbines

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 3013 ◽  
Author(s):  
Clemens Jauch ◽  
Arne Gloe
Keyword(s):  
Power Systems ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Power Plants ◽  
Frequency Control ◽  
Negative Consequences ◽  
Realistic Case ◽  
System Utilization ◽  
Continuous Feed

This paper presents findings of a study on continuous feed-in management and continuous synthetic inertia contribution with wind turbines. A realistic case study, based on real measurements, is outlined. A wind turbine feeds into a weak feeder, such that its power has to be adapted to the permissible loading of this feeder. At the same time the wind turbine is to provide inertia to the grid by applying the previously published variable inertia constant controller. It is discussed that optimal grid utilization and simultaneous inertia contribution are mandatory for the frequency control in power systems that are heavily penetrated with renewable energies. The study shows that continuous feed-in management can be combined well with continuous inertia provision. There are hardly any negative consequences for the wind turbine. The benefits for the grid are convincing, both in terms of increased system utilization and in terms of provided inertia. It is concluded that wind turbines can enhance angular stability in a power system to a larger extent than conventional power plants.

scholarly journals Fault Tolerant Control of Internal Faults in Wind Turbine: Case Study of Gearbox Efficiency Decrease

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Younes Ait El Maati ◽  
Lhoussain El Bahir ◽  
Khalid Faitah
Keyword(s):  
Steady State ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Operating Point ◽  
Rotor Speed ◽  
Integral Term ◽  
Internal Faults

This paper presents a method to control the rotor speed of wind turbines in presence of gearbox efficiency fault. This kind of faults happens due to lack of lubrication. It affects the dynamic of the principal shaft and thus the rotor speed. The principle of the fault tolerant control is to find a bloc that equalizes the dynamics of the healthy and faulty situations. The effectiveness decrease impacts on not only the dynamics but also the steady state value of the rotor speed. The last reason makes it mandatory to add an integral term on the steady state error to cancel the residual between the measured and operating point rotor speed. The convergence of the method is proven with respect to the rotor parameters and its effectiveness is evaluated through the rotor speed.

scholarly journals Use of SCADA Data for Failure Detection in Wind Turbines

2011 ◽  
Author(s):  
Kyusung Kim ◽  
Girija Parthasarathy ◽  
Onder Uluyol ◽  
Wendy Foslien ◽  
Shuangwen Sheng ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Clustering Algorithms ◽  
Failure Detection ◽  
Cost Effective ◽  
Diagnostic Techniques ◽  
Maintenance Cost ◽  
Maintenance Costs ◽  
Detection Algorithms ◽  
And Performance

High operations and maintenance costs for wind turbines reduce their overall cost effectiveness. One of the biggest drivers of maintenance cost is unscheduled maintenance due to unexpected failures. Continuous monitoring of wind turbine health using automated failure detection algorithms can improve turbine reliability and reduce maintenance costs by detecting failures before they reach a catastrophic stage and by eliminating unnecessary scheduled maintenance. A SCADA (Supervisory Control and Data Acquisition System) -data based condition monitoring system uses data already collected at the wind turbine controller. It is a cost-effective way to monitor wind turbines for early warning of failures and performance issues. In this paper, we describe our exploration of existing wind turbine SCADA data for development of fault detection and diagnostic techniques for wind turbines. We used a number of measurements to develop anomaly detection algorithms and investigated classification techniques using clustering algorithms and principal components analysis for capturing fault signatures. Anomalous signatures due to a reported gearbox failure are identified from a set of original measurements including rotor speeds and produced power.

Simulation Analysis of Planetary Gears Train of Semi-Direct Drive Wind Turbine Based on ADAMS

2015 ◽  
Vol 789-790 ◽  
pp. 311-315 ◽  
Author(s):  
Yan Li Cheng ◽  
Zheng Ming Xiao ◽  
Li Rong Huan ◽  
Fu Chen
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Planetary Gear ◽  
Gear System ◽  
Direct Drive ◽  
Three Dimensional Model ◽  
Velocity Change ◽  
Planetary Gears

The speed increasing gearbox is the key part of the wind turbine and its role is to transmit power which is generated by wind turbines to the generator through the gear system. The single-stage planetary gears train system is commonly used in the semi-direct drive wind turbines. In this paper Pro/E is used to establish the three-dimensional model of the speed increasing planetary gear system of the semi-direct drive wind turbine. Motion pairs, drive and load of the model are added by ADAMS. Angular velocity change rule of the parts is obtained. The change rules of the mesh force of the planetary gears, ring and sun gear can be obtained through the dynamic simulation and analysis using the contact algorithm. These are useful to study the vibration and noise of the system.

Dynamic Characteristics of Planetary Gears Train of Semi-Direct Drive Wind Turbine

2012 ◽  
Vol 271-272 ◽  
pp. 868-871 ◽  
Author(s):  
Zheng Ming Xiao ◽  
Zhi Hong Yin ◽  
Yu Guo
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Dynamic Characteristics ◽  
Design Parameters ◽  
Support Vector ◽  
Parameter Method ◽  
Direct Drive ◽  
Heavy Load ◽  
Planetary Gears ◽  
Torque Load

The speed increasing gearbox is the key part of the wind turbine, and it requires higher reliability and service life than general mechanical system. The single-stage planetary gears train(PGT) are commonly used in the semi-direct drive wind turbines, which sustain low speed, heavy load, varying speed and varying load. The dynamic characteristics are very complex, due to the frequent disturbance under the random wind and have a greater impact on reliability and stability of wind turbines. In this paper, the torsional dynamic model for PGT of semi-direct drive wind turbine was developed by lumped parameter method. According to the configuration and design parameters of the planetary gears, the natural frequencies are calculated, and the vibration modes are also analyzed. The actual wind speed is simulated by the weight sparse least squares support vector machines (WSLS- SVM), and the input torque load is also obtained. Considering the varying wind load and parameter excitations of system, the dynamic response of the PGT is calculated by numerical method.

Sign in / Sign up

Export Citation Format

Share Document