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In order to provide a testing for Wind Energy Conversion Systems (WECS) control strategies, a Wind Turbine Emulator (WTE) was designed and realized. The experimental implementation of the WTE for WECS consists of permanent magnet DC motor controlled by Pulse-Width Modulated (PWM). A DC motor is used to generate speed and torque required by the aero generator (PMSG) for producing electrical power....
in this paper, a simple and low cost single phase seven-level inverter for PV solar pumping system is proposed. The system consists of a dc-dc multilevel boost converter which is utilized for generating three voltages at its output terminal. In addition a dc-ac multilevel converter apt for the engendered dc bus voltages generates seven levels at its output terminal. The proposed system has the advantages...
This paper proposes voltage oriented control (VOC) for three phase PWM rectifier. The basic principles of the PWM rectifier are analyzed, and then the three-phase mathematical of the input AC Voltage sensorless PWM rectifier control system is established in synchronous rotating coordinates dq. The main goal of the control system is to maintain the dc output voltage at the desired value, while input...
The three level inverters (NPC), present a big interest in the field of the high voltages and the high powers of the fact that they introduce less distortion and weak losses with relatively low switching frequency. This paper present a direct torque control of three level inverters fed induction machine. In order to provide better torque regulation and lower switching frequency, a simple switching...
Generally manufacturer provides the transfer function of the wind energy conversion system. This paper aims to present a sensorless method to estimate the wind speed and determine the power coefficient of the wind energy conversion system. The method is based only on measurements of the current and voltage at the output of the permanent magnet synchronous generator. A spectrum analysis using the Fast...
This paper presents a comparative analysis between conventional direct torque control (C_DTC), Modified direct torque control (M_DTC) and twelve sectors direct torque control (12_DTC).Those different strategies are compared by simulation in term of torque, flux and stator current performances. Finally, a summary of the comparative analysis is presented.
This paper presents an approach to determine the power coefficient for a standalone wind energy conversion system (WECS) and estimate the wind speed. The knowledge of the power coefficient requires absolutely estimating the mechanical power supplied by the wind turbine of the system. An Extended Kalman Filter (EKF) associated to a PMSG model is used to reconstruct angular velocity and position. Generally...
This paper is to compare the DTC applied to an induction motor fed by two-level voltage inverters and a three level voltage inverters, and to demonstrate the great advantages of using a three-level inverters type NPC. The speed control is realised by using a PI controler. The effectiveness of this approach is shows by simulation results using Power System Blocset (PSB) of Matlab / Simulink.
In this paper, we present a study for modifying the topology of ENSET Mohammedia Morocco wind generator system. The electric energy storage is substituted by a boost chopper. Thus the electric power and DC output voltage became depending to the duty cycle of the boost chopper. The main proposed control is based on regulation of the inductance current of the boost converter. Finally the electric power...
the aim of this paper is to presents a contribution for detailed comparison between fuzzy direct torque control (FDTC) strategy of Induction Machine (IM) using FLC and fuzzy logic switchers (FLS), and the conventional DTC using the two PI and IP controller. The performances of those two control schemes are evaluated and compared by simulation in terms of speed, flux, torque, current ripples and transient...
An improved and modified Direct Torque Control (DTC) algorithms for permanent magnet synchronous motor (PMSM) drive is investigated in this paper, which features low torque and flux ripple and almost fixed switching frequency. Indeed, a first algorithm uses DTC with Space Vector Modulation (SVM), which is called DTC-SVM, improves greatly the torque and flux ripples compared to the basic DTC reported...
Direct Torque Control (DTC) has becoming the industrial standard for Induction Machine (IM) torque control by means of very simple control schemes. This paper presents a contribution for detailed comparison of Direct Torque Control strategies (Classical DTC, SVM-DTC and Fuzzy DTC) for Induction Machine. The performances of those various methodologies are evaluated and compared by simulation in terms...
This paper presents a contribution for detailed comparison between two control strategies for Induction Machine (IM) drives: Direct Field-Oriented control (DFOC) and Direct Torque Control (DTC). The performances of those two control schemes are evaluated and compared by simulation in terms of sensitivity to machine parameters. Finally a summary of the comparison not only regarding the performance...
This paper presents the simulation results in Matlab/Simulink of three versions of permanent magnet synchronous machine (PMSM) vector control. In order to choose the most suitable pulse width modulation (PWM) strategy for controlling the voltage inverter, in term of electromagnetic torque ripple minimization, three modulation techniques associated with the vector control are investigated i.e. sinusoidal...
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