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Various control strategies for power regulation in variable-speed wind turbines commonly assume that the whole system parameters are known and available, which is not necessarily satisfied in practice. In this work, an adaptive control strategy, which neither need to know completely the system parameters nor the rotor acceleration, is proposed for power regulation and tracking. It also includes a...
The paper considers the principle of stabilization for the rotation speed with the use of a magnetic CVT in the form of a magnetic gearbox providing the required reduction coefficient. The paper is devoted to investigations of transients in a autonomous power system consisting of wind turbines with synchronous generators with permanent magnets under sudden change wind speed. The investigation involves...
In this study slip permanent magnet couplers (slip-PMC) for wind turbine application are introduced and their analysis technique used in finite element method (FEM) is presented. Two optimization methods are employed in determining optimum permanent magnet (PM) rotors for a fixed wound rotor size. The machine topologies, namely surface-mounted and spoke-mounted PM rotor topologies are evaluated against...
This paper proposes a improved hill climbing searching (HCS) maximum power point tracking (MPPT) control strategy for the dual power flow (DPF) wind energy conversion system (WECS) which is based on the electrical variable transmission (EVT). The proposed improved HCS MPPT strategy is developed based on the electrical power which is generated by the stator. The peak detection capability has been devised...
This paper introduces a new configuration of wind turbine drivetrain that collects energy from two interconnected wind turbines. Hydrostatic transmission is utilized to collect the energy and transfer it to a ground-level generator. A mathematical model of the system is obtained and utilized in the control of generator speed and tracking of the maximum power point. Variable displacement pumps and...
In this paper, reluctance synchronous machines are designed and optimised to operate in the 5 MW power range for the implementation as wind generators. It is shown, when assuming no rotor deformation, that reluctance synchronous generators can be comparatively designed to operate in this power range with power factors higher than 0.8 achieved. In order to further improve the machine performance, an...
This paper presents a new design of hybrid Petri net sliding mode control (PNSMC) applied to reach the maximum power point tracking (MPPT) of a variable speed wind energy conversion system. To solve the main and major undesired phenomenon faced by conventional sliding mode control, the high frequency oscillations known as chattering, the design of a hybrid controller based on Petri network sliding...
This paper presents a research regarding a special design for a micro-wind turbine that drives a permanent magnet generator with two rotors that spin in opposite directions and recovering the energy by intermediate of brushes-rings system. The aim of this study is to develop and prove the functionality of a two rotors counter rotating permanent magnet generator by comparative results between the finite...
This paper presents recently developed Variable Gain Super Twisting Algorithm (VGSTA) for Direct Power Control (DPC) of a grid connected Doubly-Fed Induction Generator (DFIG) system to regulate stator active and reactive power directly in stationary reference frame. Grid-connected DFIG system exhibit highly non-linear behaviour due to random wind fluctuations, uncertainties in machine parameters and...
Darrieus type vertical axis wind turbines are preferred for the small scale distributed power generation for their distinctive advantages, yet these lift based turbines suffers from poor self-starting capability. As a potential solution, a Dual rotor Darrieus Turbine (DD) with secondary rotor in addition to the primary rotor has been proposed to improve the self-starting characteristics and to enhance...
Tribology of renewable energy systems such as for wind turbines is a relatively new field and the study of which has a potential to reduce turbine component failures and turbine downtime. In this paper we focus on offshore wind turbines tribological issues in comparison to on-shore counterparts and address a coating deposition method which has potential to be used in wind turbine industry. In this...
Wind Energy is a promising sector which has a rapid growth over a recent few years. Hence a fault tolerant and optimized control system of a wind turbine is propitious as it secures the energy production. The nonlinear multidisciplinary physical modelling should be built which is convenient and seemly legit for the purpose of control analysis. Including the effect of wind shear and tower shadow in...
In this paper a flux weakening method for a wind power permanent magnet generator is proposed. In a wind energy conversion system, the rotor speed increases with the wind speed, hence a flux weakening (FW) algorithm should be implemented as a part of the control structure in order to prevent generator voltage from exceeding the maximum permissive value. On the other hand, it is essential to provide...
This paper focuses to improve wind turbine systems efficiency, in other words, to maximize the output power delivered by the wind turbine. To do this it is necessary to have a good controller. In this study, we use a nonlinear synergetic controller. Synergetic control theory is applied to reach the maximum power point tracking (MPPT) of a variable speed energy conversion system. A comparison with...
In this paper, a nonlinear model is established for wind energy conversion systems (WECSs) under the rated wind speed. An improved control approach is then proposed for the WECS to deal with non-Gaussian disturbance induced by wind speed. Finally, simulation results show the effectiveness of the improved control approach.
Precise fault diagnosis of the pitch system in wind turbines is essential and is of practical significance for evaluating it by the usage of the SCADA (Supervisory Control And Data Acquisition) system. Firstly, the fault mechanism of the pitch system is investigated, including the source classification of the faults, and their direct connections with the SCADA data. Secondly, state feature extraction...
This paper proposes to optimize wind energy extraction through a hybrid PID-Fuzzy pitch control strategy for wind turbines. The modeling of a 20 kW wind turbine will be reviewed, in which three strategies of pitch control, PID, Fuzzy and Hybrid PID-Fuzzy, will be implemented, comparing the results of the different control strategies.
Various models have been proposed to analyze the impact of synthetic inertia on frequency response. On one hand, the models that are detailed and realistic in terms power system impact normally overlook detailed representation of inertia emulation, which prevents the analysis of the impact of different control/optimization synthetic inertia policies on power systems. On the other hand, systematic...
The aim of this work is to study the bending effect of the tower of a variable speed wind turbine system on its production of electrical energy and how this production is related to the structural fatigue of the tower. The research is built using a simulator based on Matlab / Simulink software. The model of variable speed energy conversion system, has an aerodynamic stage described according to unsteady...
In this paper, an improved decreasing torque gain(IDTG) control method was proposed to improve the performance of maximum power point tracking(MPPT) of multi-type wind turbines with large rotational inertia. A novel optimization strategy for gain coefficient improvement was used in the proposed method, which can adjust gain coefficient according to the rotational inertia of wind turbines. It is more...
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