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A robust control approach depending on delay is designed for the pitch-controlled variable-speed wind energy conversion system (WECS) above the rated wind speed range under the impact of time-delays. H∞ performance index is adopted to test the effect of the disturbance on the controlled output. A state feedback controller with time delay is designed such that the wind output power can be maintained...
In this paper, a radial basis function (RBF) neural networks sliding mode controller is designed for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). The aim is to ensure maximum power capture. Within this control scheme, the WECS nonlinear control affine model is transformed into the canonical form via a diffeomorphism transformation. Afterwards, a RBF neural...
To pave the way for higher penetration of wind turbines in the power grid, it is necessary to improve efficiency of wind energy conversion systems in terms of production rate maximization and operational cost minimization. In turn, with available technologies, this calls for advanced control strategies in wind industry. In this article, some basic concepts related to the control of wind turbines are...
This paper presents the application of H-infinity controller for speed control of variable speed wind turbine system. For constant Wind speed and blade pitch angle aerodynamic torque coming from wind is constant, with the increase in demanded electrical torque the rotor speed decrease. Preferred function of the wind turbine is to keep the turbine speed close to rated speed and also the output power...
This paper deals with dynamic modelling and control of wind power units in an offshore wind farm with a de system, consisting of permanent magnet synchronous generators, diode-bridge rectifiers and dc/dc converters. Such an integration offers a robust structure well-suited for offshore wind power applications. A simplified yet accurate model for a wind power unit is proposed and validated for the...
This paper focuses on a robust power generation control strategy for a variable speed wind energy conversion system based on a permanent magnet synchronous generator. The proposed control strategy combines a robust observer of the aerodynamic torque with a Sliding Mode (SM) based field oriented control strategy. The robust vanishing of the observation error and the tracking error is proved. Reported...
In this work the problem of robust model predictive control (robust MPC) of a wind turbine in the full load region is considered. A minimax robust MPC approach is used to tackle the problem. Nonlinear dynamics of the wind turbine are derived by combining blade element momentum (BEM) theory and first principle modeling of the turbine flexible structure. Thereafter the nonlinear model is linearized...
When the wind speed is between the cut-in and the rated wind speed, the generator control aims at maximum energy capture. The third-order nonlinear model of the Permanent magnet synchronous generator (PMSG)-based wind power conversion system (WECS) is established. In order to ensure maximum energy capture under rated wind speed, firstly, the nonlinear model is linearized around different operating...
This paper presents an RST controller design applied to a horizontal wind turbine, functioning in the above rated wind speeds area. The controller presented here, is a robust digital controller which aims to regulate the wind turbine rotor speed through collective blade pitch control. The paper starts with a state of the art of wind turbines and their problematic and continues with the design of the...
The emergence of wind turbine systems for electric power generation can help satisfy the growing global demand. This paper proposes a control strategy to maximize the wind energy captured in a variable speed wind turbine, with an internal induction generator, at low to medium wind speeds. The proposed strategy controls the tip speed ratio, via the rotor angular speed, to an optimum point at which...
With improved generator and turbine designs, better control techniques and low environmental impact, wind energy has emerged as a potential source of bulk power across the globe. In this paper, the authors report on the development of a variable speed controller for a doubly-fed induction generator (DFIG) based wind energy conversion system (WECS). DFIG is preferred as the generator because of several...
By analyzing the operation behavior of an A.C. excited variable-speed constant-frequency (VSCF) wind-power generator, the field-oriented vector control technique and and the internal model controller (IMC) are transplanted into the voltage control of DFIG.The IMC were transplanted into the cutting-in control of the doubly-fed induction generator with no-load and a novel cutting-in control strategy...
Optimum wind energy extraction is a very important economical target. This paper is concerned with the development of a robust controller for the wind turbines in hybrid wind-diesel storage system (HWDSS). The proposed algorithm, which is based on fuzzy linear matrix equalities (FLME), maximizes the power coefficient for a fixed pitch. Moreover, it reduces the voltage ripple and stabilizes the system...
The method of H_/Hinfin optimization is used to detect the power sensor fault under the condition of using various speed wind turbine systems in this paper. This method takes into account the robustness of the fault detection observer against disturbances and sensitivity to faults simultaneously. First in this paper, a physical model of the fundamental drive-system dynamics of a 400 kW horizontal...
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