فهرست مطالب

Journal of Majlesi Journal of Mechatronic Systems
Volume:7 Issue: 3, Sep 2018

  • تاریخ انتشار: 1397/06/10
  • تعداد عناوین: 6
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  • Chitra K * Pages 1-7
    High efficient solar Photo-Voltaic (PV) inverters are demanded in recent electrical power scenario to satisfy the energy demand. The transformerless single stage T-Source Inverter (TSI) proposes high efficiency due to the voltage boost capability than the conventional Voltage Source Inverter (VSI) and Current Source Inverter (CSI). However in conventional VSI fed solar PV system, to increase the voltage from inverter additional transformer is used. The additional transformer used increases the total size, cost and power losses in the conversion process; as a result the efficiency of the system is reduced. This paper describes the analysis of solar PV system by employing T-Source Inverter (TSI) with Third Harmonic Injected Maximum constant Boost (THIMCB) PWM control . This TSI based solar PV system overcomes the conceptual and theoretical limitations of VSI and CSI. The TSI have shoot through time period which is responsible for boost in voltage. The voltage stress of switching devices and harmonics are less when compared with the VSI fed solar system. The output voltage of the solar PV system can be increased by increasing the boost factor directly without using the step-up transformer or dc-dc booster circuit. The mathematical expressions for boost factor, shoot through duty ratio, voltage gain and voltage stress are obtained and validated by Matlab/Simulink simulation results.
    Keywords: Solar PV system, T-Source Inverter, THIMCB PWM, Shoot through, Simulation, Harmonics
  • Mohammed Berka *, Mourad Hebali, Abdelkader Baghdad Bey, Zoubir Mahdjoub Pages 9-16
    Conversion of solar light into silicon photovoltaic cells into electrical energy create significant efficiency losses; physical and technological. Studies on the physical characteristics of photovoltaic cell materials show that technological losses such as considerable reflection and modest absorption efficiency can be minimized. In this work, we propose a new structure that is based on a planar metamaterial waveguide; this guide can contribute to the optimization of the performance of photovoltaic silicon cells. Our proposed structure is a novel approach to anti-reflective coating devices used to achieve high absorption in silicon solar cells. The planar guide; deposited on the silicon layer consists of a network of metamaterial Split Ring Resonators (SRRs) which have a magnetic resonance due to a negative permeability (). The incidence of electromagnetic waves on our structure is made according to the electric transverse modes (TE) for various inclination values (). The geometrical shape of the (SRRs) and the substrate on which they are engraved are chosen to have maximum absorption, whereas the reflection, transmission and absorption coefficients will be represented as a function of the associated wavelength for different values of the incidence. To simulate our structure which is quite complicated, we will use Ansoft HFSS commercial software.
    Keywords: Absorption, Metamaterials, Photovoltaic cell, Electric transverse
  • Habib Benbouhenni * Pages 17-26
    This paper presents a fuzzy second order sliding mode controller (FSOSMC) used for command stator active and stator reactive powers of doubly fed induction generator (DFIG). Based on the three-level space vector modulation with fuzzy logic (FL) controllers (FSVM). The powers command simulation results are obtained by using the proposed FSOSMC with FSVM and the traditional PI controller (Indirect Vector Command (IVC)) under different operating conditions. Also, sensitivity analyses simulation results for parameter variations are obtained to check the robustness of the system when using the proposed regulator. Finally, the simulation controlled system is illustrated for closed loop and simulation results are presented which show the validity and effectiveness of the proposed FSOSMC with FSVM inverter.
    Keywords: Fuzzy second order sliding mode control, doubly fed induction generator, fuzzy logic, fuzzy space vector modulation, indirect vector control
  • Mohammad Moosaeinasab * Pages 27-32
    This study serves to contribute to the ongoing and developing research on the application of dynamic loads to Overhead Transmission line modelling processes. Special focus was on tall overhead transmission line towers. Tall transmission towers usually occur at critical points of a distribution line with most design currently carried out using static loading which is assumed to provide a conservative result. Dynamic load modelling expands the knowledge of the designer as to the true response of a structure under such conditions thereby enabling more informed design. The main results show a reduction of 10% in maximum uplift force for the studied tower when modelled with dynamic loads that included static forces for the conductors. A theoretical reduction of up to 18% was obtained when conductor loads were excluded and static and dynamic response of the tower alone studied and compared. Complete understanding of the tower´s behavior is achieved through the dynamic process enabling more efficient design.
    Keywords: Dynamic load, static load, overhead transmission
  • Ahmed Dris * Pages 33-40
    In this article, we present the construction of observers of rotor flux and mechanical speed needed for robust control of the induction machine. Two observers will be developed for comparison. The first is based on the techniques MRAS and the second is observer of KUBOTA, with the enhanced DTC-ANN (by artificial intelligence), "sensorless DTC". The validity of the proposed methods is confirmed by the simulation results. This work is devoted to the construction of rotor flux observers and the mechanical speed necessary for the robust control of the induction machine. Two speed observers will be developed for comparison. The first is based on the MRAS technique and the second is based on KUBOTA, with the improved DTC-ANN control "sensorless DTC control». The THD (Total Harmonic Distortion) of stator current, torque ripple and stator flux ripple are determined and compared with conventional DTC control scheme using Matlab/Simulink environment.
    Keywords: Induction Machine, DTC-ANN, KUBOTA, MRAS Observers, THD (Total Harmonic Distortion)
  • Parishad Eghbali, Farshad Babazadeh * Pages 41-45
    In this paper, design and simulation of an electroosmotic micropump for use in biomedical applications and drug delivery devices is reported. This electroosmotic micropump is based on MEMS technology and is fully compatible with the processes of manufacturing of electromechanical systems. The basis of the proposed micropump structure is based on the electroosmotic phenomenon and the main idea used in the proposed structure is to use the technique of increasing fluid and wall contact within the main channel of the micropump. To this end, the use of internal microchannels along the main channel path has been used; these embedded microchannels, by increasing the contact surface between the fluid and the wall, enhance the electroosmotic effect inside the micropump, resulting in an increase in fluid velocity and the output flow rate. Simulation results show that the minimum speed of a simple micropump with a length of 600 μm and a width of 300 μm and applied potential of 10 volts without internal microchannels is equal to 0.22 mm/min. In the proposed structure, with the addition of 8 internal microchannels with a length of 90 μm and a width of 20 μm inside the main channel of the micropump, the flow rate of the fluid reaches 7.8 mm per minute. According to the simulation results it can be seen that, by adding the proposed microchannels to the electroosmotic micropump structure, the fluid outlet speed compared to the non-microchannel mode increases dramatically by up to 35 times at the same potential.
    Keywords: Electroosmotic micropump, Microchannel, Drug delivery, Microelectromechanical systems, MEMS