Single-stage three-phase AC/DC step-up medium voltage resonant converter for offshore wind power systems

Jiangsu is one of the most prosperous provinces in China with the highest population density but a shortage of fossil fuel. However, wind energy is recognized as a sustainable resource which is abundant in Jiangsu Province. Even so, the fluctuation of wind power, offshore and non-grid-connected wind power systems are required to manage this fluctuation. In addition, hydrogen production using wind power is a new idea to increase the contribution of wind power. According to the current situation of Jiangsu Province and wind power technology in China, there are both advantages and disadvantages to the method of hydrogen production in using non-grid-connected offshore wind power.

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Naval & Non-Naval WARP Offshore Wind Power Systems with Integral Fuel Cells

41st Aerospace Sciences Meeting and Exhibit ◽

10.2514/6.2003-1351 ◽

2003 ◽

Author(s):

Alfred Weisbrich ◽

William Smith ◽

Gunther Weisbrich

Keyword(s):

Fuel Cells ◽

Power Systems ◽

Wind Power ◽

Offshore Wind ◽

Offshore Wind Power ◽

Wind Power Systems

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Numerically and Experimentally Verified Design of a Small Wind Turbine with Injection Molded Blade

Processes ◽

10.3390/pr9050776 ◽

2021 ◽

Vol 9 (5) ◽

pp. 776

Author(s):

Byunghui Kim ◽

Sang-June Park ◽

Seokyoung Ahn ◽

Myung-Gon Kim ◽

Hyung-Gun Yang ◽

...

Keyword(s):

Numerical Simulation ◽

Power Systems ◽

Wind Turbine ◽

Wind Power ◽

Offshore Wind ◽

Power Coefficient ◽

Manufacturing Method ◽

Small Wind Turbine ◽

Verification Methods ◽

Wind Power Systems

Although mega-watt class onshore and offshore wind power systems are used to generate power due to their cost-effectiveness, small wind power systems are important for household usages. Researchers have focused on aerodynamic characteristics as a conceptual design from their previous studies on Archimedes spiral wind turbines. Here, we verified the design of a small wind turbine AWM-750D (100 W capacity) via both numerical simulation and experimentation. We used commercial code ANSYS CFX for numerical simulation and compared turbulence models and surface roughness for determining the performance. To obtain reliable and robust blades, we analyzed the effective manufacturing method with Moldflow. Through a test with an open-suction type atmospheric boundary layer wind tunnel, we varied wind speed from 4.0 m/s to the rated value of 12.5 m/s and obtained 106 W, equivalent to a power coefficient of 0.205. In addition, we compared the numerical and experimental power vs. rotational speed and found the former is 6.5% lower than the latter. In this study, we proved that numerical simulations can act as design verification methods to predict wind turbine performances and reliable manufacturing. Through our research, we provided the prototype of a small wind turbine with 100 W to act as an efficient electric power supplier for households and also the stable manufacturing process for complex spiral blades using injection molding.

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Challenges in All-DC Offshore Wind Power Plants

Energies ◽

10.3390/en14196057 ◽

2021 ◽

Vol 14 (19) ◽

pp. 6057

Author(s):

Alessandra Follo ◽

Oscar Saborío-Romano ◽

Elisabetta Tedeschi ◽

Nicolaos A. Cutululis

Keyword(s):

Wind Power ◽

Direct Current ◽

Power Plants ◽

Low Frequency ◽

Offshore Wind ◽

Collection System ◽

Component Level ◽

Medium Voltage ◽

Offshore Wind Power ◽

Wind Power Plants

As the size and distance from shore of new offshore wind power plants (OWPPs) increase, connection to shore using high-voltage (HV) direct-current (DC) technology becomes more cost-effective. Currently, every offshore wind power plant has a collection system based on medium-voltage alternating-current technology. Such systems rely on heavy and bulky low-frequency (i.e., 50 or 60 Hz) transformers: a drawback offshore, where equipment weight and space are restricted. Consequently, there is growing interest in medium-voltage direct-current collection systems, in which low-frequency transformers are replaced with DC/DC converters equipped with lighter and smaller medium-frequency transformers. However, the deployment of all-DC OWPPs still faces several challenges. Based on a very comprehensive and critical literature review, three of them are identified and discussed in this paper. The first challenge is the technological gap at component level. In this work, the DC/DC converter topologies most suitable for application to OWPPs are described and compared. The second challenge is the controllability of DC collection systems. Parallel, series and hybrid DC collection system layouts are presented and discussed. The third challenge is the compliance of all-DC OWPPs with current requirements for their connection to the onshore grids. The three challenges are discussed to highlight current research gaps and potential future directions.

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