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This article presents an autonomous wind turbine, in which take place the generation and accumulation of two types of energy — electricity and heat, which are needed in the home of an individual consumer. Such combine heat-power wind turbine except of functionality extensions has simple and effective system for optimal control. Efficient generation of electricity is carrying out by means of a passive...
In this paper, we present a method for controlling a wind system consisting in a wind turbine (WT) and a permanent magnet synchronous generator (PMSG) so as to achieve the operation in the optimum energy efficient zone at time-varying speeds of wind. It analyzes the operation of a WT in the maximum power zone by changing the generator load, while the wind speed varies significantly over time. The...
The main objective of this work is the determination of the relationship between wind speed and optimum speed. In this paper we determine the mechanical energy captured from the wind turbine (WT) and transformed into electricity by permanent magnet synchronous generator (PMSG) connected to WT. We can determine, through simulation, the mechanical angular speed (MAS), ωOPTIM and optimum load resistance...
Frequency stability is an important issue in small diesel hybrid autonomous power systems (mini-grids) with high penetration of wind power. With large variations of wind power and load demand, the rate of change of frequency (ROCOF) and frequency excursions tend to increase what can lead to load shedding and tripping of renewable energy generators. The power required from the grid-forming diesel engine...
This paper deals with the control of small-power wind turbine using fixed-pitch blades. A three-phase permanent magnet (PM) brushless generator is connected to the grid through a double stage converter: active rectifier (VSR) + d.c.-link + inverter (VSI). A very simple and effective control strategy of the generation set (PM generator +VSR) is presented; it is mainly aimed to extend the wind-turbines...
This paper presents the modeling of a PV-wind hybrid system in Matlab/Simulink. The model is useful for simulation of a hybrid PV-wind system connected to a grid. Blocks like wind model, PV model, energy conversion and load are implemented and the results of simulation are also presented. The behavior of hybrid system employing renewable and variable in time energy sources while providing a continuous...
By adding a variable external resistance to the rotor of an induction generator used in a wind turbine, it is possible to manipulate the torque-speed curve and control the output power. The hardware implementation is accomplished by a set of three-phase external resistors connected in series with the rotor windings. To vary the effective value of the external resistance, a three-phase diode bridge...
This paper presents an artificial neural network (ANN) observer for a speed sensorless permanent magnet synchronous generator (PMSG) in wind energy conversion system (WECS). In order to perform maximum power point tracking control of the wind generation system, it is necessary to drive wind turbine at an optimal rotor speed. From the aspect of reliability and increase in cost, wind velocity sensor...
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