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This paper proposes a low voltage ride through (LVRT) scheme for the permanent magnet synchronous generator (PMSG) variable speed wind energy conversion system (WECS) at the grid faults to follow the requirements defined by the grid codes. The dc-link voltage is controlled by the machine-side converter instead of the grid-side converter. Taking into consideration the nonlinear relationship between...
Wind turbines require periodic maintenance procedures to ensure reliable operation of the system. Regular servicing of the rotor demands calibration of the speed and position sensor in aggravated circumstances of the dynamic wind. This sensor is one of the most critical components for the drive reliability and the calibration greatly increases the time of repair. The main focus of the paper is to...
The intermittent nature of renewable energy has been discussed in the context of the operational challenges that it brings to electrical grid reliability. In contrast, Demand Side Management (DSM) with its ability to allow customers to adjust electricity consumption in response to market signals has often been recognized as an efficient way to mitigate the variable effects of renewable energy. However,...
This article investigate the interconnection between marine sea wave generators and power distribution networks. In particular, it assumes that introducing a spatial offset between generators, and considering them as an unique array, it is possible to improve conversion efficiency. The proposed architecture consider an array of Wave Energy Converter (WEC) interfaced with an electronic power converter,...
The demand side management (DSM) represents an effective way of improving the profitability of renewable energy systems. Indeed the optimal management of some consumers' electric loads can strongly decrease the functioning cost of such systems (fuel consumption by the diesel generator and Lead-acid accumulator ageing). In this paper, the DSM is to try to match the electrical consumption and the photovoltaic...
In this paper we introduce a small hydro plant that uses Archimedes screws. This is an alternate solution to small-scale hydropower as it exploits unused resources such as small rivers or streams. Based on previous studies, we explain how to obtain the optimal design of an Archimedes screw according to its nominal design flow rate, its inclination and its number of blades. Then, we develop a numerical...
This paper demonstrates that using a control strategy based on a fractional derivative scheme improves the response of an energy storage unit, thus making better use of the resources available versus using other control strategies based on classical PD control. The energy storage technology studied in this paper is the flywheel. By optimizing its response, the storage equipment requirements are decreased,...
ISWEC (Inertial Sea Wave Energy Converter) is a system using the gyroscopic reactions provided from a spinning flywheel to extract power from sea waves. The flywheel and the energy conversion systems works inside the sealed floating body thus being protected from the marine environment to obtain reliable and durable operation. The goal of this work is to identify a strategy to optimize the performance...
The design of a wave energy converter (WEC) requires the preliminary selection of dimensional parameters in accordance with variables such as location site, power take off (PTO) characteristics or control strategy, with the aim of developing a realistic model to be used in the test of power takeoff devices. The paper proposes a laboratory test bench to test direct-drive linear generators, for being...
In this paper, a non-linear model predictive controller (NMPC) is formulated as an objective function aiming to track the rotor speed for a wind turbine. The proposed controller is applied directly to the nonlinear model of wind turbine without the use of any linearization technique. When compared to methods reported in the literature, the simulation results showed that the proposed controller outperforms...
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