Planning and operation for power system with wind power generators: A review

In this paper, we propose a microgrid (MG) implementation method through Medium-Voltage Direct Current (MVDC) connection between Gapado Island and Marado Island in Korea. MVDC is a facility that can be efficiently applied between small power generation complexes. The structure of power generation facilities is mainly supplied by diesel generators, while solar and wind power generators supply additional power. An Energy Storage System (ESS) is also used to reduce the output fluctuations of wind and solar power generation. Since power systems in such areas are low-voltage and low-power distribution systems, problems can arise in terms of power management due to power generators with variable output characteristics such as solar power and wind power generators. In addition, when a major power source such as a diesel generator is dropped, the power system collapses. However, these problems can be solved by interchanging the power between the micro-grids through the connection of MVDCs. With the MVDC connected, we verify the impact of the power system on Marado Island and Gapado Island due to the input and opening of solar, wind and diesel generators. The proposed configuration uses the PSCAD/EMTDC simulation program.

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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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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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