Abstract
This study presents an efficient system that smooths fluctuations in electrical power from a cross-flow (i.e., “vertical-axis”) turbine. The proposed solution is a two-stage approach consisting of a low-pass filter and a bi-directional buck-boost converter. The design and stability characteristics of the system are presented, followed by time-domain simulation and validation against small-scale experiments. When this validated simulation is applied to a full-scale system, we demonstrate a 99% root mean square reduction in fluctuating power output with only a 3% drop in electrical system efficiency. This could allow intracycle control strategies to increase mechanical power output without causing electrical power fluctuations that are incompatible with direct use.
Highlights
One of the largest challenges for the electrical integration of distributed renewable resources is power fluctuation over both relatively short and long time scales [1]
Long-term power intermittency is a well-established concern in the renewable energy industry, and the feasibility of grid-scale energy storage systems to mitigate this is an active area of research [2, 3]
Like generation from other renewable resources, current turbines operating in rivers, tidal channels, and strong ocean currents will be required to adhere to distribution and transmission grid standards [5]
Summary
One of the largest challenges for the electrical integration of distributed renewable resources is power fluctuation over both relatively short and long time scales [1]. We show how a PSS can be designed for the specific electrical power characteristics of cross-flow current turbines operating under intracycle control which results in power fluctuations that are an order of magnitude higher than in other renewable energy systems and requires intermittent power draw. This necessitates an additional LC filter on the DC bus to smooth power over a complete rotation, which is unnecessary for loweramplitude power fluctuations. The performance and feasibility of a larger-scale system for a cross-flow turbine operating under intracycle control is demonstrated through simulation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
