scholarly journals Effects of Output Power Fluctuation on Short Circuit Current of Induction -type Wind Power Generators

2007 ◽  
Vol 127 (5) ◽  
pp. 629-636
Author(s):  
Teruhisa Kumano
Keyword(s):  
Wind Power ◽  
Output Power ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Power Fluctuation ◽  
Power Generators ◽  
Induction Type ◽  
Wind Power Generators

scholarly journals Diagnosis of Short-Circuit Fault in Large-Scale Permanent-Magnet Wind Power Generator Based on CMAC

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Chin-Tsung Hsieh ◽  
Her-Terng Yau ◽  
Jen Shiu
Keyword(s):  
Fault Diagnosis ◽  
Permanent Magnet ◽  
Wind Power ◽  
Large Scale ◽  
Short Circuit ◽  
Back Propagation ◽  
Power Generators ◽  
Error Back Propagation ◽  
Wind Power Generator ◽  
Wind Power Generators

This study proposes a method based on the cerebellar model arithmetic controller (CMAC) for fault diagnosis of large-scale permanent-magnet wind power generators and compares the results with Error Back Propagation (EBP). The diagnosis is based on the short-circuit faults in permanent-magnet wind power generators, magnetic field change, and temperature change. Since CMAC is characterized by inductive ability, associative ability, quick response, and similar input signals exciting similar memories, it has an excellent effect as an intelligent fault diagnosis implement. The experimental results suggest that faults can be diagnosed effectively after only training CMAC 10 times. In comparison to training 151 times for EBP, CMAC is better than EBP in terms of training speed.

scholarly journals Increasing the Sensitivity of the Digital Relay Protection Against Turn-to-turn Short Circuits And Asymmetries In Wind Power Generators

2020 ◽  
Vol 186 ◽  
pp. 03001
Author(s):  
Nedelcho Nedelchev ◽  
Misho Matsankov
Keyword(s):  
Neural Networks ◽  
Wind Power ◽  
Short Circuit ◽  
Back Propagation ◽  
Relay Protection ◽  
Back Propagation Algorithm ◽  
Power Generators ◽  
Short Circuits ◽  
Artificial Neural ◽  
Wind Power Generators

The paper describes the implementation of neural networks for increasing the sensitivity of the digital relay protection against turn-to turn short circuits in the stator winding and asymmetric modes in wind power generators. Models have been developed for monitoring two standard and two emergency mode parameters, whose deviation from the set-points is an indication of occurrence of turn-to-turn short circuits and asymmetric modes, or of combinations of these types of failures. An artificial neural network, trained by error back-propagation algorithm has been used. An experiment has been conducted to define the four criteria for studying the problem at different percentage of the short-circuit turns. A comparison between the results from both the experiment and the modeling has been made using artificial neural networks. The proposed approach, realized by means of a digital relay, allows for increasing the sensitivity of the digital relay protection against turn-to-turn short circuits and asymmetric modes for wind power generators.

scholarly journals Airflow Characteristics According to the Change in the Height and Porous Rate of Building Roofs for Efficient Installation of Small Wind Power Generators

2021 ◽  
Vol 13 (10) ◽  
pp. 5688
Author(s):  
Jangyoul You ◽  
Kipyo You ◽  
Minwoo Park ◽  
Changhee Lee
Keyword(s):  
Wind Speed ◽  
Wind Power ◽  
Turbulence Intensity ◽  
Flow Characteristics ◽  
High Porosity ◽  
Power Generators ◽  
Speed Reduction ◽  
Reduction Effect ◽  
Wind Power Generators ◽  
The Impact

In this paper, the air flow characteristics and the impact of wind power generators were analyzed according to the porosity and height of the parapet installed in the rooftop layer. The wind speed at the top was decreasing as the parapet was installed. However, the wind speed reduction effect was decreasing as the porosity rate increased. In addition, the increase in porosity significantly reduced turbulence intensity and reduced it by up to 40% compared to no railing. In the case of parapets with sufficient porosity, the effect of reducing turbulence intensity was also increased as the height increased. Therefore, it was confirmed that sufficient parapet height and high porosity reduce the effect of reducing wind speed by parapets and significantly reducing the turbulence intensity, which can provide homogeneous wind speed during installation of wind power generators.

Effect of Metal Coating on FRP Blade Lightning Failure for Wind Power Generators

2005 ◽  
Author(s):  
H. Sakamoto ◽  
A. Takebayashi ◽  
M. Hanai
Keyword(s):  
Wind Power ◽  
Experimental Situation ◽  
Metal Coating ◽  
Testing Laboratory ◽  
Power Generators ◽  
Full Size ◽  
Wind Power Generator ◽  
Power Testing ◽  
Blade Failure ◽  
Wind Power Generators

In Japan, with the recent increase in wind power generator installations, the incidence of lightning damage to FRP blades is increasing. Lightning damage is a significant issue in Japan since lightning in Japan seems severer than that in Europe or the US. In Kochi, Japan, six 600-750 kW grade generators have been installed, and some have been damaged by lightning several times. To resolve this problem, the Kochi University of Technology received a request in 2002 from the Kochi prefectural government for research into lightning protection. After surveying the literature and questioning related organizations such as NREL and Toray USA, experiments to protect against lightning damage to FRP blades of wind power generators were planned. Half size models and two 1/4 parts of a full size 250kW blade were prepared as specimens for this research. The method investigated to protect against lightning damage was metal coating. The aim being to protect against blade failure by using metal coating in actual field situations; by using a 1/2 size model and the full size blade specimens in an experimental situation. As in previous experiments, these ones were mainly conducted in the Toshiba Hamakawasaki High Voltage High Power Testing Laboratory. This Testing Laboratory is one of the biggest test laboratories for experiments involving high voltages and large currents.

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