Abstract
A system that combines a wind turbine and a wave generator can share the off-shore platform and therefore mix the advantages of the transmission system construction and the power conversion system. The current hybrid generation system considers output limitation according to the instructions of the transmission system operator (TSO), and controls the profile using wind turbine pitch control. However, the integrated wave generation system utilizing a DC network does not adapt a power limitation scheme due to its mechanical constraints. In this paper, a control plan focusing on the electrical section of wave generators is formed in order to effectively manage the output profile of the hybrid generation system. The plan pays attention to power reserve flexibility for the utility grid using the analysis of the controllable elements. Comparison with the existing system is performed based on real offshore conditions. With the help of power system computer aided design (PSCAD) simulation, the ability of the novel technique is estimated by proposing the real power control based on the reference signal of TSO and the reactive power capacity it produces.
Highlights
Interest in the study of auxiliary equipment and integration technology regarding a variety of distribution generators is steadily increasing in line with the interest in sustainable and renewable energy sources
The historical value is applied on the entire simulation process and a classified sections that requiring real power control owing to wind fluctuation are extracted
Several real power excess points exist in the regulation section due to lack of the additional control method, and the available reactive power is fully dependent on the wind power control
Summary
Interest in the study of auxiliary equipment and integration technology regarding a variety of distribution generators is steadily increasing in line with the interest in sustainable and renewable energy sources. In terms of renewable energy sources, technical research is underway to be able to perform output power control and ancillary services such as low voltage ride through and voltage control by composing clusters mainly based on wind generators [1,2] Among these studies, the offshore wind industry has continuously sought to increase efficiency by installing turbines at sea, in which efforts have been made to improve the availability of electrical equipment for cluster infrastructure or the suitability of power extraction from wind energy [3]. The system is currently being studied and has a unique output power characteristics as it is composed of several wave and wind systems This unusual system structure is a major consideration for this paper because each unit in the HGS is not considered as an individual controllable unit by TSO, and the management system can control the available power with certain purpose. If the TSO wants to maximize the available reactive power due to a system constraint such as low voltage conditions, the operation mode can be changed with the proposed method
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