Abstract
In this paper, a new control strategy for power output smoothing in a hybrid wave energy installation coupled to a flywheel energy storage system (FESS) is proposed. The control scheme is composed by three stages: a wave generator clustering process at the farm connection point; a power filtering process; and the control of the flywheel energy storage in order to improve the power output of the hybrid wave farm. The proposed control is validated at the existing Lysekil Wave Energy Site located in Sweden, by using real generator measurements. Results show that the application of the flywheel energy storage system reduces the maximum peak power output from the wave energy installation by 85% and the peak/average power ratio by 76%. It is shown that the proposed system can reduce grid losses by 51%, consequently improving the energy efficiency of the power network. The application of the proposed control strategy allows the hybrid wave power plant to follow a power reference signal that is imposed by the grid operator. In addition, the study demonstrates that the application of the proposed control allows the hybrid wave power plant to follow a power reference signal that is imposed by the grid operator. In addition, the study demonstrates that the application of the proposed control enables a wave farm with flywheel energy storage to be a controllable, flexible resource in order to fulfill future grid code requirements for marine energy installations.
Highlights
In 2016, the World Energy Council stated that the global marine generation capacity was92 PWh/year, which points to the possibility that wave energy could become more competitive compared with other forms of renewable generation in the future [1]
Flywheels are found to be a good option for the smoothing process
It was confirmed that utilizing flywheel systems coupled to wave farms improves the power output, and the grid integration of this technology is improved
Summary
In 2016, the World Energy Council stated that the global marine generation capacity was. Some studies have proposed clustering a set of wave energy converters (WECs) in order to generate power that can be injected into the grid with reduced oscillations without needing to use an ESS. Only regular waves were considered, and the behavior of synthetic regular waves differs greatly from real wave conditions From this aspect, it must be noted that the use of ESSs has proved to be effective for smoothing wave power output. The proposed control strategy can be used for wave power output regulation in order to satisfy future grid codes for marine energy sources. The proposed control considers the application of flywheel ESSs for wave energy plants to smooth the power output delivered to the grid. Data gathered from the real emplacement were later utilized to implement the developed control algorithms
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