Controller design and dynamic simulation for an H-Darrieus type floating VAWT

초록

Vertical-axis wind turbines (VAWTs) typically have lower power coefficients than horizontal-axis wind turbines (HAWTs), but are considered promising for floating offshore applications due to their lower installation and maintenance costs, lower center of gravity of the rotor nacelle assembly (RNA), and lesser wake effects. To be competitive with floating HAWTs, it is essential to develop control techniques that alleviate the adverse effects of lower power coefficients and mitigate platform motions and fatigue loads. This study aims to design a blade pitch control algorithm for an H-Darrieus type floating VAWT and evaluate its performance using QBlade based on the double-multiple stream tube (DMS) method. The developed individual pitch control for VAWTs (IPCV) maximizes power production by maintaining each blade's angle of attack (AOA) at its optimal value, while a rotor-speed-input-based pitch angle compensation is applied to mitigate platform motions and tower loads. The controller was implemented as a dynamic link library (DLL) and evaluated in terms of generator power, platform motions, and fatigue loads.

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