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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...
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...
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...
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.
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...
In series-dc wind plants, variations in power output among turbines due to aerodynamic effects may lead to violations of operational limits of electric machines and power electronic converters. Turbine wakes constitute the predominant cause of such variations. It is, therefore, imperative to incorporate wake models during analysis of wind plant-level issues and control strategies. In this paper, two...
Wind turbines control, as a vanguard field of green energy generation, has been a focal point of many researchers in recent decades. In the present research, it is aimed to stabilize a wind turbine under control in condition of grid fault. The proposed control approach is based on an adaptive sliding mode one, which illustrates robustness toward parameter faults. The simulated results indicate that...
In this paper, a novel dynamic model of a self-excited induction generator (SEIG) is presented. In the proposed model, the fundamental stray load and iron losses are accounted for in a way that preserves the order of the conventional induction machine (IM) model. The corresponding equivalent resistances are determined from the standard tests. The SEIG has been considered as part of a wind conversion...
In order to study the theory and characteristics of the mechanical drive system fault in the current signal of the wind turbine generator better, the fault simulation experimental platform of double fed wind generator drive gear is used as the research object, and the simulation model of double motor torque and rotational speed coupling is established by a motor and a doubly fed wind generator according...
The goal of this paper is to design a wind turbine generator operated under variable speed with intelligent pitch angle control capability under variable wind conditions. The control scheme for the variable speed wind turbines has been discussed and analysed using wind turbines driven by the permanent magnet generators connected to the grid. Main strategies of conventional control and intelligent...
The paper presents the development of a wind turbine emulator, which consists of an induction motor driven by a torque control inverter, and the dead-beat controller plays an important role in this structure. The wind turbine emulator system includes the dead-beat current controller, wind speed emulator, mathematical model of wind turbines, model of rotor blade characteristics, and model of tower...
The Darrieus wind turbines are simple in design with high power coefficient, yet they are poor performers in low wind speed regime. As a potential solution to improve the low wind speed performance, a notched airfoil (KF-N-21) was incorporated into straight bladed Darrieus rotor and experimentally compared with conventional NACA0021 rotor from the earlier study. The experimental results displays the...
The paper deals with implementation of maximum torque per ampere (MTPA) control strategy for a permanent magnet synchronous generator as a part of a wind energy conversion system (WESC). The variable speed wind turbines require appropriate control of the generator power, toque and speed in order to maximize the energy production under varying wind speed using appropriate MPPT algorithms. The power...
Nowadays, wind power is being widely used as a renewable source of energy. The major disadvantage is the dependence of the wind's velocity and direction to maximize the power production. Actually, wind is unpredictable and the availability of wind energy is not constant. Once it's possible to deal with the wind velocity on the blades by controlling the pitch angles, is also possible to deal with the...
This paper work develops the dynamic model of a wind system based on a permanent magnet synchronous generator (PMSG). The dynamic modeling of the system requires prior knowledge of the parameters of the turbine, of the machine and of the static converters which are controlled by the pulse width modulation (PMW) to ensure the interconnection between the generator and the grid. Using a control approach...
In this work, we present the study and the modeling of a variable speed wind energy system based on the permanent magnet synchronous generator. The proposed system produces through a rectifier and an inverter controlled by PI regulators in the objective to obtain optimum energy efficiency by improving a robust, perform and effective the active and reactive power control of the system. The simulation...
We transform the NREL (National Renewable Energy Laboratory) 5-MW geared equipped monopile wind turbine model into a hydrostatic wind turbine (HWT) by replacing its drivetrain with a hydrostatic transmission (HST) drivetrain. Here we focus on the design of blade pitch controller for the HWT using a linear parameter varying (LPV) control algorithm. To enhance performances of the pitch control system...
The paper presents a Nonlinear State Feedback Controller combined with a Support Vector Machine for Regression (SVR) for the two-mass model of variable speed wind turbine (VSWT). The control objective is to maximize, below rated wind speed, the extracted energy from the wind by rotating the WT rotor at a reference proportional to the effective wind speed. The SVR offline learning algorithm is used...
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