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

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.

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

E3S Web of Conferences ◽

10.1051/e3sconf/202018603001 ◽

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.

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An investigation on AC loss reduction for permanent-magnet wind power generator with superconducting windings

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-210045 ◽

2021 ◽

pp. 1-13

Author(s):

Zhuo Chen ◽

Ye Ma ◽

Kaihe Zhang ◽

Chenxi Zhou ◽

Xiaoyan Huang ◽

...

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Wind Power ◽

Large Scale ◽

Ac Loss ◽

Model Calculations ◽

Power Generators ◽

Wind Power Generator ◽

Perpendicular Component ◽

Wind Power Generators

High temperature superconducting (HTS) tapes could be introduced into large scale wind power generators in order to improve the power density. However, the alternating current (AC) loss of HTS tapes will cause the reduction of efficiency. On the basis of analytical and numerical model calculations, this paper presents an optimal design of the HTS armature winding aiming at lower AC loss. The main contribution of this work is that the relationship between the installation parameters and the AC loss of such HTS armature windings has been figured out based on the analysis of the shape feature of the HTS tape and the external magnetic field. When the tape is placed along a particular direction where the perpendicular component of external magnetic field has the lowest amplitude, the AC loss is the smallest. The modified installation location and angle are found based on the proposed generator. These results are verified using finite element method (FEM).

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

Design Engineering, Parts A and B ◽

10.1115/imece2005-79312 ◽

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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