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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 deals with Wind Energy Conversion System (WECS) control equipped by Doubly-Fed Induction Generator (DFIG). Based on variable speed wind turbine and aerodynamic torque estimation, high order sliding mode controller is developed to improve the dynamic performances of WECS by producing the required electromagnetic torque generator. The desired DFIG torque is directly tracked using the proposed...
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...
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...
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.
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 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 the use of an active yaw system to protect small and medium wind turbines in the high wind zone from overloading. The active yaw system turns the rotor partially out of the wind to decrease the turbine power. The dependency of the power on the yaw angle is modeled by the third power of the cosine of the yaw angle. A proper controller is configured based on on-off control of the...
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...
In this paper, the problem of Soft-stall power control design for a small wind turbine is considered. Passive stalling and furling methods are widely used to limit the output power of small wind turbines at above-rated wind speed conditions. However, these methods have substantial limitations, for instance, related to tracking the maximum power at some wind speed levels, limited variable speed operation...
This paper presents an analysis of the main maximum power point tracking (MPPT) methods used for small wind turbines, from the perspective of providing dynamic frequency support in islanded microgrids (MGs). For this purpose, three MPPT algorithms are considered, which are adapted to operate in two modes, namely in normal and deloading regimes. The second mode of operation allows the wind turbine...
Maximum power point tracking (MPPT) has been widely studied since it is closely related to the efficiency of wind harvesting. Generally, there are two major approaches to realize MPPT. One is to reach the optimal power point by perturbing and observing the extracted wind power; the other is to reach the optimal power output by tracing the turbine power curve. Each approach has its pros and cons and...
This paper proposes a frequency regulation strategy applied to wind turbine generators (WTGs) in an isolated grid. In order to complement active power shortage caused by sudden load or wind speed change, an improved deloading method is proposed to solve inconsistent regulation capabilities in different speed regions and provide WTGs a certain capacity of power reserves. Considering the torque compensation...
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...
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...
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...
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