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

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).

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.

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.

scholarly journals Renewable Energy Generation at Udayana University

2020 ◽  
Author(s):  
Core UDAYANA ◽  
Satya Kumara
Keyword(s):  
Wind Power ◽  
Research Collaboration ◽  
Pilot Project ◽  
Diesel Generator ◽  
Pv System ◽  
Power Generators ◽  
Wind Power Generator ◽  
The University ◽  
Renewable Energy Generation ◽  
Wind Power Generators

A pilot project of RE power generation system at Udayana University has been planned with research collaboration between the university and the MEMR. The system consistsof a 26.4 kWp PV system, 5 kWp wind power generators, 240 kVAh battery system, and a 20-kVA diesel generator set. The PV and wind power generator systems are placed on the roof of DH building, while the batteries and the generator set are located in a building next to DH Building. The generated power will be used for teaching, laboratory and administration needs. Commissioning of the system is planned in November 2016.

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.

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