Abstract
This paper proposes a wind-wave farm system with a self-energy storage capability and a smoothed total power output. The fluctuating electrical power from wave is smoothed by utilizing the rotor inertias of the wind turbines as short-term energy storage devices, thus without extra energy storage hardware the investment and maintenance cost of the wave energy conversion is reduced. This is achieved based on the fact that the wind power can be viewed as constant during a typical wave period (5~12 s). The proposed integral compensation control of the wind turbines can optimize two conflicting objectives: maximizing wind energy capture at different wind speeds and regulating the rotor speeds of wind turbines as kinetic energy storage devices. It enables the turbine speed to swing around its optimum points at different wind speeds. Consequently, the total power output of the wind-wave farm is well smoothed at a marginal cost of the power take-off efficiency loss. RTDS simulations and quantitative analysis are presented to demonstrate the proposed system. To demonstrate its superiority, the proposed control method is compared with the direct compensation of the wave power based on the existing maximum power point tracking method.
Highlights
Wave energy is gaining interests as a possible contributor to the world energy portfolio, though presently it is much less explored than the wind and solar energy
Based on the fact that the electrical power from the wind sector can be viewed as constant during a typical wave period, the proposed system uses the rotor inertias of the wind turbines as the short-term energy storage to smooth the fluctuating power from the wave sector
This design stands on the trend of combining the wind and wave power production together, and enjoys the advantage of delivering smoothed power output to the local grid without additional energy storage devices
Summary
Document Version Publisher's PDF, known as Version of record Citation for published version (Harvard): Zhao, X, Yan, Z & Zhang, X 2016, 'A Wind-Wave Farm System With Self-Energy Storage and Smoothed Power Output', IEEE Access, vol 4, pp. Received October 29, 2016, accepted November 11, 2016, date of publication November 22, 2016, date of current version January 4, 2017.
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