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The complex and unsteady aerodynamics of vertical axis wind turbines (VAWTs) pose significant challenges for simulation tools. Recently, significant research efforts have focused on the development of new methods for analysing and optimising the aerodynamic performance of VAWTs. This paper presents an electric circuit model for Darrieus-type vertical axis wind turbine (DT-VAWT) rotors. The novel Tchakoua...
This study proposes a control system design for Electrical Network Connected Wind Farm (ENCWF) using Direct Drive Permanent Magnet Synchronous Generator (DD-PMSG). The generators are connected to the power network by Voltage Source Converter (VSC) with a dc-link. The proposed scheme is based on Backstepping technique and regulates the powers exchanged between the ENCWF and the electric network to...
In this paper a supervision system based on the proportional distribution algorithm is developed, for a large wind farm based on the squirrel cage asynchronous generator (SCAG), associated with the maximum power point tracking (MPPT) and the PQ control. The MPPT control mode is used to extract the maximum power from the wind and the PQ control is used to inject the required active and reactive power...
The rotor dimensioning of a wind turbine is essentially based on aerodynamic theory to define the parameters affecting its overall performance. The blade element momentum theory (BEM) has been widely used as a tool for the design of wind turbine blade. An existing airfoil shape with known chord and twist can be input to BEM to calculate the efficiency. On the other hand, if we set airfoil as unknown...
Recently, the squirrel cage induction generators have been widely employed to operate in small hydroelectric generators and wind turbine generators of isolated power system. This paper presents experimental results using dSPACE board of Self Excited Induction Generator (SEIG) when the capacity value, the speed rotor and load changes. The voltage value of the SEIG terminal is not constant but she is...
This paper deals with the problem of the constant-power operating envelope at high speed in the wind energy conversion systems. The considered aero-generator involves a hybrid excitation synchronous generator (HESG). To operate at constant-power, it is recommended to use a feedback flux-weakening control, the hybrid excitation circuit is compatible with the extended-speed-range constant-power operation,...
The manuscript presents an analysis of the aerodynamic behavior of a Horizontal Axis Wind Turbine (HAWT) using a new approach to evaluate the fluid mechanics parameters. Based on the Blade Element Momentum theory (BEM), this analysis leads to determine a detailed algorithm containing all steps needed to achieve an optimal design including the correction factors in order to straighten the weaknesses...
Optimal unit sizing of generation units in small off-grid systems is an important aspect to minimize total annual cost. This can be applied to wind, photovoltaic (PV), and hybrid wind-PV power generating systems to meet power demand for a residential home constructed at a specific site located in remote hilly areas in Turkey's northwest Black Sea coast where no grid extension is available. It is obvious...
In this paper, a radial basis function (RBF) neural networks sliding mode controller is designed for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). The aim is to ensure maximum power capture. Within this control scheme, the WECS nonlinear control affine model is transformed into the canonical form via a diffeomorphism transformation. Afterwards, a RBF neural...
The aim of this paper is to investigate the possibility of setting a wind farm in the region of Ksar-Chellala, which is located in the province of Tiaret at 260 km to the south of Algiers. For this purpose three-hourly wind data, recorded at 10m height over a period of thirteen years were processed and simulated using WAsP software. Annual, monthly, seasonal and daily wind characteristics were assessed...
This article deals with the modeling and control by sliding mode of active power and reactive power stator of an doubly fed induction machine (DFIM), which constitutes the generator part of a variable speed wind turbine. The goal is to apply this command to control independently of active and reactive power generated by the induction machine decoupled flow direction.
This paper presents the modeling, simulation and control strategy of a hybrid power system (HPS) integrating a wind energy conversion system (WECS), a solar photovoltaic system (SPV) and a biodiesel generator (BDG) as well as a storage battery designed to ensure power reliability under all various weather conditions. The model includes wind turbine, photovoltaic panels, permanent magnet synchronous...
This article presents a study aimed at the determination of the stresses and deformations for a planetary gear of a speed multiplier of a wind turbine. These planetary gear are made by using part and assembly design module in Pro/ENGINEER 4.0 M220 software, while the analysis is done in ANSYS V15 software to evaluate the constraints and the deformations using the finite element method. Optimization...
The energy generated using a photovoltaic (PV) are depends mainly on meteorological factors such as temperature and solar radiation. Considering the high cost and the low efficiency of a PV system, it must operate at maximum power point (MPP) which changes with the load variations and weather conditions. This article presents the conception of a nonlinear controller for the DC-DC converter to retrieve...
in this paper, a simple and low cost single phase seven-level inverter for PV solar pumping system is proposed. The system consists of a dc-dc multilevel boost converter which is utilized for generating three voltages at its output terminal. In addition a dc-ac multilevel converter apt for the engendered dc bus voltages generates seven levels at its output terminal. The proposed system has the advantages...
This paper investigates the control problems of the single-phase grid connected to the photovoltaic system through an inverter with LCL filter. The control objectives are threefold: (i) forcing the voltage in the output of PV panel to track a reference signal provided by the MPPT block; (ii) regulating the DC link voltage to ensure the power transferring from the source to the grid; (iii) providing...
The paper reports on the application of full-order ℋ∞ controller and ℋ∞ Fixed-Order Optimisation (HIFOO) controller to a Doubly-Fed Induction Generator wind turbine (DFIG). These controllers use the ℋ∞ mixed sensitivity problem to achieve an enhancement in both, Nominal Performance (NP) and Robust Stability (RS) margins for the uncertain DFIG plant while respecting constraints, such as dynamic tracking...
This article compares the efficiency of two methods, fuzzy logic and ripple correlation control to track the maximum power point of a photovoltaic panel used for LED lighting supply in order to illuminate locals which need artificial light during the day. The use of this technique will reduce power consumed through the electrical grid and consequently decrease the rate of carbon dioxide. Calculation...
This paper describes a photovoltaic system with a robust controller which enhances the maximum power point tracking and stable output power. The proposed controller is designed based on sliding mode method. The performance of the proposed controller is simulated under different environmental conditions and compared with a classical Perturb & Observe method. Simulation results are presented to...
This paper deals with the study and simulation of photovoltaic (PV) inverter for stand-alone applications. The system is composed of a PV array feeding RL load through a dc-dc boost converter and three-phase inverter. To assess the system performance, simulations based on hybrid co-simulation approach are performed. At the outset, the PV model is elaborated using Pspice, verified and compared with...
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