Improvements to the operation of wind power generators in Vietnam

In Vietnam, the number of wind power generators has been increased yearly. Because of geophysical characters, the generation of these generators has different properties. It depends much on wind’s characteristics as well as the generation technology. Based on simulation implemented on Matlab, the paper analyzes the stability of national networks at PCC nods containing the connection of wind power station when there is a change of wind’s velocity or when there is an earth fault in grid. The analyzing results are used to suggest solutions to improve the stability and effectiveness of the whole system. Các nhà máy điện gió đang ngày càng gia tăng ở Việt Nam, do cấu tạo địa lý nên đặc điểm của nguồn điện này khá khác biệt so với các nguồn điện truyền thống khác. Nguồn điện gió phụ thuộc nhiều vào đặc điểm của gió và công nghệ sử dụng để phát điện gió. Nội dung chính của bài báo là khảo sát mức độ ổn định của lưới điện kết nối các nguồn điện gió tại nút kết nối chung khi có sự thay đổi về tốc độ gió hoặc khi trong mạng xảy ra sự cố chạm đất thoáng qua, từ đó đề xuất giải pháp nâng cao ổn định, tin cậy và nâng cao hiệu quả làm việc của hệ thống.

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

Sustainability ◽

10.3390/su13105688 ◽

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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Modeling of turning angle of the windmill blades of a wind power station working on the power network

Russian Electrical Engineering ◽

10.3103/s1068371211120078 ◽

2011 ◽

Vol 82 (12) ◽

pp. 659-664 ◽

Cited By ~ 1

Author(s):

R. I. Mustafaev ◽

L. G. Gasanova

Keyword(s):

Wind Power ◽

Power Network ◽

Power Station ◽

Turning Angle ◽

Wind Power Station

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Disconnection control of wind power generators for the purpose of reducing frequency fluctuation

Electrical Engineering in Japan ◽

10.1002/eej.20911 ◽

2010 ◽

Vol 171 (1) ◽

pp. 10-18

Author(s):

Yuki Hori ◽

Hiroumi Saitoh

Keyword(s):

Wind Power ◽

Frequency Fluctuation ◽

Power Generators ◽

Wind Power Generators

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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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