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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...
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...
The aim of this paper is to control a Wind Energy Conversion System (WECS), equipped with a Permanent Magnet Synchronous Generator (PMSG), for maximum power generation. Maximum Power Point Tracking (MPPT) control algorithm is applied to a PMSG whose stator is connected to the grid through a back-to-back AC-DC-AC converter. The Stator Side Converter (SSC) is controlled in such a way to extract the...
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...
This paper presents a grid-connected Wind Energy Conversion System (WECS) using a permanent magnet synchronous generator (PMSG) operating with variable speed. A maximum power point tracking (MPPT) algorithm is used to determinate the power to be extracted from the generator for each rotational speed while wind power remains lower than the PSMG rated power. Otherwise, the MPPT algorithm is disabled...
The aim of this paper is to present a maximum power point tracking (MPPT) method for wind power systems. The control algorithm uses Back-stepping Control technique. This control strategy, based on electromagnetic torque, tracks the maximum power for different wind speeds. The control of our system is tested under fault condition by simulation. A few results are presented and discussed to prove simplicity,...
In this paper a Backstepping Controller (BC) and a Maximum Torque Per Ampere (MTPA) strategy have been designed in order to control a permanent magnet synchronous generator (PMSG) at below and above rated wind velocity. At low wind speed, the wind turbine operates in partial load (PL) and the maximum amount of power is extracted. When the wind speed reaches the nominal value, the wind turbine operates...
This work develops a high nonlinear method based active and reactive decoupled current controller for a variable speed and fixed pitch wind energy conversion system (WECS) with an doubly fed induction generator (DFIG). The control objective is to maximize the total active power delivered by the system at the meanwhile regulate the reactive power injected by the voltage oriented controlled (VOC) converters...
This paper proposes a sensorless control strategy for doubly-fed induction generators (DFIGs) in variablespeed wind turbine systems (WTS). The proposed scheme uses an extended Kalman filter (EKF) for estimation of rotor speed and rotor position. Moreover, the EKF is used to estimate the mechanical torque of the generator to allow for maximum power point tracking control for wind speeds below the nominal...
This paper offers an improved Tip speed ratio (TSR) technique for variable speed operating mode of grid connected doubly-fed induction generator (DFIG) system. As we know from the literature, the TSR is the fastest MPPT (maximum power point tracking) technique because it uses directly the wind velocity signal to compute the optimal rotational speed of the wind turbine, However, the significant wind...
This study proposes a novel Variable Structure Direct Torque Control (VS-DTC) scheme for Wind Farm (WF) based on the Permanent Magnet Synchronous Generators (PMSGs) in order to maximize the generated power from wind turbines. The 30KW wind farm consists of 3 PMSGs based 10KW generators connected to a common DC-bus. Each generator of the farm is connected to the DC-bus through a rectifier, but the...
This paper presents maximum power control of doubly-fed induction generator (DFIG) based grid-connected wind energy system. The control system used a combination of MPPT method with pitch control to extract maximum power from the wind turbine. PWM hysteresis controller is used to control the back to back converter which output is connected to the utility grid through a multivariable filter. The overall...
With a growing penetration of Permanent Magnet Synchronous Wind Turbine Generations (PMSG-WT) into the modern power system, a comprehensive modeling and analysis of PMSG-WT is required to investigate its dynamic stability and interaction between large wind farm and power grids. In this work, a complete detailed MW-class variable speed Wind Turbine System based on a Permanent Magnet Synchronous Generator...
This paper proposes a new method to achieve MPPT (Maximum Power Point Tracking) without mechanical sensors (Anemoscope or position sensor) in WECS (Wind Energy Conversion System) based on PMSG (Permanent Magnet Synchronous Generator). With this method, by adopting SMO (sliding mode observer), MPPT can be achieved only by measuring phase voltages and currents of the generator. This method proves to...
In double objectives control of wind power generation system, two components, a slowly varying component and a rapidly varying component are considered for wind model. This paper proposes a frequency separation guideline to get these two components for better realization of double objectives control. It makes use of the results of power spectral density analysis to determine the cutoff frequency of...
The aim of this paper is to present the study, the control and the simulation of the wind mill connected to the electrical supply network of strong power at variable speed based on a dual stator induction generator (DSIG). The study of operation of the wind turbine leads us to two essential cases: optimization of the power for wind speeds lower than the nominal speed of the turbine and limitation...
The wind turbines used for power generation should enable to produce maximum power, making best use of available energy in the wind. A specific known terminology: Maximum Power Point Tracking (MPPT) must be introduced to obtain maximum energy efficiency. The strategy from this command is to control the electromagnetic torque to adjust the speed mechanics to maximize the electrical power generated...
This paper describes the control of squirrel cage induction generator (SCIG) and its responses to grid voltage unbalance. The paper presents the vector control of SCIG. On the SCIG side converter, the control strategy enables the independent control of flux and electromagnetic torque. On the grid side converter, the control strategy is implemented to regulate the DC voltage and the reactive power...
In this paper, we present a performance study of a variable pitch wind turbine with a Permanent Magnet Synchronous Generator (PMSG). The control strategy used Maximum Power Point Tracking (MPPT) below the rated speed, which corresponds to low and high wind speed, and the maximum energy can be captured from the wind. The Pitch angle control which is the most common means for adjusting the aerodynamic...
In this paper we present a new sensorless control for Wind Energy Conversion System (WECS) based on Doubly Fed Twin Stator Induction Generator (DFTSIG). The aim of this control is to extract the maximum wind power and to control the power generation only by measuring phase voltages and currents. The proposed control scheme is ensured without the need of using any rotor speed or wind sensors from the...
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