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Because the environment that the wind turbine runs in is severe, the generating efficiency is low and the vibration of tower is very obvious. The consequence not only causes economic loss but also lead to the reduction of the wind turbine's lifetime. Basing on the traditional PI controlling system, this passage mainly studies to decrease the vibration of the tower by adjusting the controlling PI parameters...
The main objective of this paper is to apply a MPPT strategy (Maximum Power Point Tracking) to a wind energy system based on a doubly fed induction generator (DFIG) in order to maximize the converted power and provide better integration into the electrical grid. First, a mathematical model of wind power system is performed. Then, two control strategies of the system were studied and implemented. The...
A wind generation system consisting of a fixed pitch angle wind turbine, a Permanent Magnet Synchronous Generator (PMSG), power electronic converters and a load, is treated in this paper. This study deals with the problem of Maximum Power Point Tracking (MPPT) of the generated power based on Takagi Sugeno fuzzy model. The stability analysis is achieved by means of Lyapunov theory and H-infinity performance...
Due to rapid changes in wind velocity the power captured by a wind turbine varies continuously. Such operations are highly undesirable and needs controllers. Therefore in order to achieve the best performance of wind turbine under variable speed operation, there is a need to modify the design of wind turbine. Power coefficient, Cp is an important parameter that determines the power extracted by a...
In this paper an investigation of the Doubly-Fed Induction Generator's start-up procedure, using zero crossing method for the grid voltage's angle's calculation, is carried out in the environment of Matlab/ Simulink. Moreover, the significance of the phase displacement and the amplitude deviation of the stator voltage in the system's synchronization procedure is highlighted via simulation.
This paper describes the implementation and investigation the functionality of the GE 3.6 MW Wind Turbine model implemented in Matlab® and Simulink® when exposed to a wind-step. The robustness of the Wind Turbine is tested by varying the aerodynamic parameters Cp, max and λopt. It is found that, the implemented model operate as expected in different wind speed regions under different disturbances...
This paper firstly describes the research background of the wind turbine imitation system, indicating the needs for the wind turbine imitation in laboratories. The current development status and the significance of the wind turbine imitation based on the switched reluctance (SR) motor are introduced. Then the model of the wind turbine and SR motor is expounded, from which the control theory and methods...
Pitch control system is the most important part of wind turbine to keep the rotor speed within its design limit. Large scale wind turbines usually adopt PI controller to adjust rotor speed above the rated wind speed. Since wind turbine system is a high-order nonlinear system, one set of PI parameters can't achieve excellent control performance, especially when wind turbulence is very strong. In view...
With the advancements in the variable speed direct drive design and control of wind energy systems, the efficiency and energy capture of these systems is also increasing. As such, many maximum power point tracking methods have been developed and implemented. These MPPT algorithms can be broadly categorized into three types: Tip-Speed control, Power-Signal feedback, and Hill climb search based. However,...
A novel approach for development of FPGA-based wind turbine control system used in isolated network in a simulation environment was proposed. The software tools in simulation environments, related design procedure and system architecture were presented. Our proposed FPGA-Field-Programmable Gate Array-based wind turbine controller receives external sensor inputs according to the operating conditions,...
With increasing wind power in power systems, impact of wind generators on subsynchronous resonance (SSR) is of interest. Previous research has shown the impact of wind generation on SSR. In this paper, a control strategy is developed utilizing the power converters' control capability in a doubly fed induction generator (DFIG)-based wind turbine system. The control is realized through modulating the...
Increasing number of wind farms (WFs) connected to power systems calls for efficient aggregate models so that large farms can be represented by only few equivalent wind turbines for steady state and dynamic system studies. A wind power plant consists of many small generators inside a wind farm. Future wind projects predict even greater number of wind turbines inside a wind farm for increased capacity...
A performance of roto-dynamic wind driven pump under normal operating conditions were estimated based on the mathematical model proposed by Mathew and Pandey for the integrated out put of wind-driven roto-dynamic pumps. Specifications of roto-dynamic and piston pumps are considered for the performance simulation under Jordanian climate conditions. The model which is applied to the roto-dynamic pumps...
This dissertation is on control system for MW-class wind turbine. The basic control structure is on the performance of wind turbine and is a control system tracked power curve. To track the power curve, we discuss the control method for variable speed variable pitch that is used for torque control and pitch control. Furthermore, the MW-class wind turbine is a large structure and mechanical load created...
In order to fully understand the characters and working principles of non-grid-connected wind turbine, this paper makes an analysis on different methods for modeling non-grid-connected wind turbine. First, according to the structure of the wind turbine, a theoretical model is presented, including three subsystems: rotor, transmission system and generator. Response of the model to a wind sequence is...
This paper presents a novel control strategy for variable speed permanent magnet synchronous generator (PMSG) based wind-battery hybrid system in an isolated network. The proposed strategy comprises of chopper based speed control of generator for maximum power point tracking (MPPT) under varying wind conditions. A buck-boost converter is used to maintain constant DC-Link voltage and to interface an...
Double-fed induction generator (DFIG) is took as a research object in this paper, a relatively complete mathematical model of DFIG control system including wind turbines, driving system and generator has been established. Besides, a variable-speed variable-pitch control strategy is put forward and some simulation models of DFIG based on MATLAB / SIMULINK are built and realized. Then, take step change...
This paper presents a maximum power point tracking (MPPT) method which is applied on a wind turbine with permanent magnet synchronous generator (PMSG). A three-phase switched mode rectifier (SMR) is connected with the three phase output of the PMSG. The SMR employs a modulation strategy which is based on the space vector modulation (SVM) technique. Thus, the three phase input voltage is divided in...
In this paper, a functional structure of a wind energy conversion system is introduced, before making a comparison between the two typical wind turbine operating schemes in operation, namely constant-speed wind turbine and variable-speed wind turbine. In addition, the modeling and dynamic behavior of a variable speed wind turbine with pitch control capability is explained in detail and the turbine...
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