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In this paper, the interfacing of the type-1 wind turbine employing double cage induction generator to the grid is presented. Rotor instability performance of this system is studied and a detailed comparison is done with the single-cage. Steady-state torque-speed characteristics are compared and the results are validated through transient and eigenvalue analysis. The effect of wind turbine characteristics...
This paper proposes a three term PID controller to achieve optimum tip-speed ratio of a variable speed fixed pitch two-mass wind turbine system. The main advantage of the method is the functional simplicity and the robust performance in a wide range of operating condition. The objective is achieved by maintaining optimum speed of the rotor via adjusting the restoring generator torque. Hence, PID controller...
Counter rotating wind turbines is a wind turbines model having two rotors rotating in opposite direction on the same axis. The purpose of the research is to find the optimal power increase can be generated in counter rotating wind turbines model (CRWT) related with variety of axial distance between front rotor and rear rotor. The study consisted of the design and testing of wind turbines model. The...
This paper presents a new optimal controller design for the sensorless variable speed wind turbine (SVSWT) based on the extreme learning machine (ELM) and the adaptive particle swarm optimisation (APSO) algorithms. The two main objectives of this command are to maximize the conversion of wind energy below the rated wind speed and to maintain the safety of the wind turbine system (WT) by minimizing...
This research is devoted in the implementation of control system for a nonlinear Wind Energy Conversion Systems (WECS) with Permanent Magnet Synchronous Generators (PMSG). In which a finite-horizon nonlinear control technique based on State Dependent Riccati Equation (SDRE) for the design of a closed-loop, optimal controller is used. The idea of the proposed technique is the change of variables that...
An alternative connection topology for a wind turbine with doubly-fed induction generator is explored, wherein the rotor is tied directly to the power grid and the stator is connected through a power electronic converter. Experiments are performed on a 7.5-kW machine to evaluate the topology. The proposed configuration is found to be more efficient than current practice.
Disturbance Accommodation Control (DAC) is used to model and simulate a system with known disturbance waveform. This paper presents a control scheme to mitigate the effect of disturbances by using collective pitch control for the aboverated wind speed (Region III) for a variable speed wind turbine. We have used Linear Quadratic Regulator (LQR) to obtain full state feedback gain, disturbance feedback...
A different topology for brushless doubly-fed induction generators is presented. A power conditioning system is mounted onto two coaxially connected wound rotors. Carbon brushes and slip rings are replaced by the wound rotors and the rotor-mounted power condition system, which bi-directionally exchanges power to the grid with appropriate amplitude and phase difference between the voltages applied...
This paper investigates the sub-synchronous resonance (SSR) phenomenon in a series compensated doubly-fed induction generator (DFIG) based wind farms. A detailed linear state space model of a fixed-series compensated DFIG wind farm is presented for different operating point conditions. The model of the system includes a wind turbine aerodynamics, a 6th order induction generator, a 3rd order two-mass...
This paper focuses on the development of maximum wind power extraction algorithms for variable speed wind power generation systems. A review of different maximum wind power extraction algorithms is presented in this paper, based on which an intelligent maximum power extraction algorithm is developed to improve the system performance and to facilitate the control implementation. As an integral part...
In this paper, a nonlinear controller is designed for variable speed wind turbine (WT) where the dynamics of the WT is derived for single mass model. The main aim of the controller is to extract the optimum power capture from the wind and minimize the transient load on low speed shaft. Modified Newton Rapshon (MNR) is used to estimate the effective wind speed and the optimal rotor speed is derived...
Today, in order to fulfill the growing need of electricity, renewable energy has occupied respectable position. Wind energy has become the most promising renewable energy source. Small wind turbine technology is in embryonic stage. The simple, cost effective and reliable small wind turbine system is the need of hour. This work is related to unidirectional co-axial series rotor wind turbine. In this...
In a dispatchable wind power plant, turbines are free to continuously vary their power production as long as the sum of their productions meets the total power demand. Previous research has shown that this freedom can be used to reduce structural loads by allowing turbines in the plant to coordinate their power. This paper explains the mechanisms that make power coordination useful for reducing structural...
Classical objective of wind turbine control is to maximize the power extracted from wind. However, with the increase in wind turbine size the structural loads become a limiting factor for safe wind turbine operation and wind turbine operating life. In this paper we investigate the design of a model predictive controller that reduces wind turbine loads at the expense of wind turbine power variability...
In this paper, modeling and simulation of a 500 KW prototype wind turbine that is being developed in the context of the MILRES (National Wind Energy Systems) Project in Turkey are presented. This prototype wind turbine has a nominal power of 500 KW at a nominal wind speed of around 11 m/s. Aerodynamic, mechanical, electrical and control models are built in S4WT (Samcef for Wind Turbines) environment...
In this paper, a control method for a Wind Energy Conversion System (WECS) utilizing a Squirrel Cage Induction Generator (SCIG) is presented. Aims of the control are both maximum wind power harvesting and minimization of the SCIG power loss, thus achieving maximum power production on any wind speed. The SCIG is connected to the utility grid through two back-to-back converters. The first converter...
An estimator of the wind speed of a wind turbine coupled to a generator is proposed in this paper. Wind speed enters into the generator dynamics through a highly nonlinear function, hence we are confronted with a difficult problem of estimation of a nonlinearly parameterized system. To solve this problem we use the technique of immersion and invariance, recently introduced in the literature. It is...
Large scale wind turbines are lightly damped mechanical structures driven by wind that is constantly fluctuating. In this paper, we address the design of a model-based receding horizon control scheme to reduce the structural loads in the transmission system and the tower, as well as provide constant (or at least smooth) power generation. Our controller incorporates two optimization problems: one to...
This paper describes a design and implementation of a low power wind turbine. The designed turbine is a Horizontal Axis Wind Turbine (HAWT), meaning that axis of rotation is parallel to the ground. Rotor, blades, supporting hub, and drive train are designed using computational software. Implemented wind turbine was tested and experimental results were obtained for 3.5 m/s to 9 m/s wind speed.
The paper's aim consists on achieving the control of a HESG for a wind turbine application. This machine has an auxiliary power source that offers the possibility to control the excitation flux and thus the machine's rotation speed. It makes it possible to achieve a variable speed wind turbine that properly operates according to a MPPT algorithm.
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