Imposed Switching Frequency Direct Torque Control of Induction Machine Using Five Level Flying Capacitors Inverter

The paper proposes a new control structure for sensorless induction motor drive based on a five-level voltage source inverter (VSI). The output voltages of the five-level VSI can be represented by nine groups. Then, the amplitude and the rotating velocity of the flux vector can be controlled freely. Both fast torque and optimal switching logic can be obtained. The selection is based on the value of the stator flux and the torque. This paper investigates a new control structure focused on controlling switching frequency and torque harmonics contents. These strategies, called ISFDTC, indeed combines harmoniously both these factors, without compromising the excellence of the dynamical performances typically conferred to standard DTC strategies. The validity of the proposed control technique is verified by Matlab/Simulink. Simulation results presented in this paper confirm the validity and feasibility of the proposed control approach and can be tested on experimental setup.Peer reviewe

Integration of Offshore Wind Farm Plants to the Power Grid using an HVDC line Transmission

This paper investigates an integration of Offshore Wind Farm Plants with Power Grid Based on an HVDC line Interconnection. Large offshore wind farms are installed in the North Sea area using modern multi-megawatt wind turbines. The Voltage source converter - high voltage direct current VSC-HVDC is a suitable means of integrating such large and distant offshore Wind Power Plants (WPP) which need long submarine cable transmission to the onshore grid. The offshore network then becomes very different from the conventional grid, in that it is only connected to electronic power converters. A wind farm model with VSC-HVDC connection is developed. This work presents the modeling and simulation of such a system. The dynamic study of system performance under the fluctuations of wind energy and wind speed was studied to demonstrate the effectiveness of the control strategy. The validity of the proposed control technique is verified by Matlab/Simulink. Simulation results presented in this paper confirm the validity and feasibility of the proposed control approach, and can be tested on experimental setup

Algeria's potential to supply Europe with dispatchable solar electricity via HVDC links: Assessment and proposal of scenarios

The idea of exporting dispatchable solar electricity from the North African region to Europe is still the subject of several bilateral meetings, workshops, and conferences, despite doubts and previous failures with the Desertec concept. Given that each North African country has its own privacy policy, energy strategy, and distinct approach to the concept of renewable energy exports, while the potential of renewable energy sources varies from country to country, it would be very helpful to assess the potential and export opportunities of each country. In this respect, this paper focuses on the potential of Algeria. Several key factors that can make Algeria an attractive place to supply Europe with dispatchable solar electricity have been identified and discussed. The factors have been identified from the European perspective and can be used to analyze the potentials of neighboring countries. The barriers that could impede the export of dispatchable solar electricity from Algeria to Europe have also been identified. Based on certain given criteria, the paper provides some scenarios of possible solar electricity import corridors from Algeria to Europe. This work is timely as the Algerian government has expressed interest in exporting its surplus electricity to Europe and is studying an electricity interconnection project with Italy