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This paper deals with the problem of interfacing a wind turbine generator with an electrical three phase grid in the presence of nonlinear loads. Wind systems are generally connected to the grid through an AC/DC inverter in the generator side, followed by a DC/AC converter in the grid side. In this work, the considered DC/AC converter is based on multilevel neutral point clamped topology, and will...
The doubly fed induction generator (DFIG) is the most used technology when it comes to the production of the electric energy for wind power generation. It has the advantage to insure a variable speed operation that will maximize the power extracted from the wind, increase the energy efficiency, reduce the torque oscillations and to generate an electric power with better quality. When we talk about...
Under voltage dip conditions, the induced rotor over-currents of the doubly fed induction generators (DFIG) may greatly destroy the converter switches. In this paper, a nonlinear control based on integral backstepping control (IBC) strategy is presented to enhance the Low voltage ride-through (LVRT) of DFIG. The goal of the proposed control strategy applied to rotor side converter (RSC) and grid side...
We are considering the problem of controlling single-phase grid connected photovoltaic system based on a half bridge inverter. The control objectives are threefold: i) Maximum power point tracking (MPPT) of PV system. ii) Unity power factor in the grid. iii) Regulating the output voltage to a desired reference value. The considered problem is dealt with by designing a nonlinear controller using the...
This paper focuses on an integration of photovoltaic (PV) and wind energy (WE) systems for sustained the electrical generation for partially cover the electrical power demand during adequate insolation, or/and adequate deposit of wind energy. Alone PV system or WE system cannot completely meet DC load demands. The proposed system combines the advantages of each generation system and provides electrical...
Solar panels outer surface inspection is among the most challenging tasks which burden the solar plants supervisors. An automatic inspection based on image processing ensured by robots seems beneficial. In our approach, a robot equipped with an HD camera and a processing unit browses a set of solar panels (placed alongside). Afterward, the robot captures a series of successive images containing a...
This paper presents the design of a shunt Active Power Filter (SAPF) for grid-connected photovoltaic systems. The proposed system injects PV power into the grid, by feeding the SAPF; to eliminate harmonics currents and compensate reactive power produced by nonlinear loads. To inject the photovoltaic power to the grid we use a boost converter controlled by a Fuzzy logic (FLC) algorithm for maximum...
Active and reactive energy are a very important factor that influences frequency and voltage setting on the electric grid. Many research projects have investigated how a wind turbine can contribute to frequency and voltage regulation, even though it is a decentralized production system. In this paper, we use a new control system to regulate active and reactive power generated by wind farms based on...
The semiconductor power devices are the main core of all power electronic devices. Therefore, the protection of semiconductor devices and their operation at a safe level are required. Semiconductor power devices, resistors, and capacitors usually have parasitic inductances and capacitances. When a rapid switching transition occurs in the switching devices, it creates a noise, an electromagnetic interference...
Marine energy is one of the most exciting emerging form of renewable energy. Tidal turbines are used to extract this energy and installed on the seabed at locations with catastrophic loading. This investigation focuses on the numerical simulation of the damage progressive in tidal turbine used for marine energy application under impact loadings. The optimal design and the dynamic behavior of the turbine...
In the present work we uses the lattice Boltzmann method (LBM) to simulate the heat transfer by natural convection in a square cavity filled by air and heated locally from below θ = 1 by a heated portion of length ℓ = H/4 placed in the center of the wall. One of the vertical walls has a cold portion θ = 0, while the other walls are adiabatic. This cavity simulates a living space with under floor heating...
The structure, stability, dehydrogenation properties of LiBH4 under compression were considered by using first principles calculations based on the density functional theory (DFT). The result indicate that compression strain is expected to cause a structural deformation of LiBH4 crystal, because of the contribution of compression strain energy. We found that also the hydrogen desorption enthalpy decreased...
This paper presents a Takagi-Sugeno (TS) fuzzy model of a three-phase micro hydropower plant (MHPP) prototype. It represents the system as an interpolation between local models. Each local model is linear system validated around an operating point. The Three-phase MHPP behavior varies with load variations and water flows. These matters create difficulties to have an exact model close to real system...
Today, phase change material (PCM) are integrated to cooling system of photovoltaic panels. There are many reasons (safe, abundant, affordable…) to use phase change material (PCM) in this field. The PCM may play an important role in increasing efficiency of PV cells. This paper describes a detailed physical issue in order to understand the effect of PCM in keeping PV cell temperature close to ambient...
Given the interest in renewable energy, various types of production of this kind of energy are in study. In the present, we are interested in harnessing marine energy currents, especially the hydro-kinetic turbines with horizontal axis. The density of water is 832 times greater than air one and underwater currents are also more powerful than the wind, the electric power supplied by a hydroelectric...
The current-voltage characteristics of photovoltaic module are non-linear, multivariable and multi-modal and difficult to optimize the electrical intrinsic parameters. The conventional methods are incapable to optimize the parameters of photovoltaic module with high accuracy. Recently, the bio-inspired algorithm such as firefly algorithm has attracted the intention to optimize the non-linear and complex...
Performance of SnS based photovoltaic solar cell is described in this research paper on the base of its numerical analysis. Cell structure consists of following sequence (p-SnS/CdS/Zno) for absorber layer, buffer layer and optical window, respectively. The numerical analysis is carried out by Photovoltaic cell Capacitance Simulator Software (SCAPS). After optimization of different parameters of the...
This paper presents a study of steady state stability of the Moroccan Power system using bifurcation analysis. More specifically, local bifurcation is considered since, unlike global bifurcation, the system can be analyzed entirely through changes in adequate local stability property of equilibrium for specific buses. The stability property used in this paper is the voltage, as this parameter becomes...
Growing concern over the threat of global climate change, and the ineluctable depletion of raw energy resources have led to an increased interest in research and development of renewable energy technologies. The ocean provides a wide potential energy resources, and as renewable energy technology develops, investment in ocean energy is likely to grow. Research in ocean thermal energy conversion, wave...
The scale of a photovoltaics (PVs) field exists between the regional scale and the scale of the air flow on a single PV panel. Field-scaled wind conditions are defined and used in the current study. They are designed after the case of QEERI solar test facility in Doha, Qatar, using a modeling approach based on Computational Fluid Dynamics. The modeling and simulation of such standardized ‘wind’ conditions...
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