فهرست مطالب

Journal of Majlesi Journal of Mechatronic Systems
Volume:7 Issue: 2, Jun 2018

  • تاریخ انتشار: 1397/03/07
  • تعداد عناوین: 6
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  • Safwan Mhrz Nadweh Pages 1-7
    This research improves variable speed drive systems VSDS stability in modern industrial distribution grids by using the four-quadrant chopper in dc-link. The transfer function of the variable speed drive systems VSDS, from the output of the three-phase diode bridge rectifier to the dc-link, is found before and after using the proposed chopper. Drawing Bode diagram in parallel with determining the value of both gain margin and phase margin before and after adding the four-quadrant chopper were introduced to evaluate of the proposed chopper and its effect on the stability conditions for the VSDs. System performance was tested at the input of unit-step and impulse-step inputs before and after adding the four-quadrant chopper. In addition, the frequency response characteristics in both cases were found to determine its effect on the dynamic and transient stability of the system
    Keywords: Four-Quadrant Chopper, Variable Speed Drive Systems(VSDS), Industrial Facilities, DC-LINK, Dynamic Behavior, Steady State, Bode Plo
  • Ehsan Akbari Pages 8-16
    In this paper, the simulation, analysis and control of modular multilevel cascade inverter double-star birdge-cells coupling is used for application in high voltage levels. The proposed inverter consists of two half-legs consisting of a number of full-bridge cells in each phase, which is finally connected to the three-phase output by connecting a double star to the desired output of the inverter proposed by combining the voltage levels of each one make these cells. The proposed inverter, a new generation of multi-stage inverters, has the potential of high voltage and high voltage, high reliability, high operating efficiency, and flexibility in comparison with conventional structures such as diode clamp, floating capacitor and H-Birdge. High availability due to modular structure. The proposed inverter structure is simulated with the method of controlling the capacitor voltage balancing and the modified phas-shift puls width modulation (MPSPWM) in the MATLAB / Simulink software environment. To validate the subject, the results of the simulation making is also provided.
    Keywords: Multilevel Inverter, Cascade Connection, Modular Structure, Modified Phase-Shift Pulse Width Modulation
  • Madhuri Jadhav Pages 19-34
    Environmental issues and energy crises are responsible for the adoption of electrification of the transport sector. Therefore electric vehicles are becoming popular and widely accepted. The electric vehicles perform certain important services but have their own impact on the power grid. This paper presents the review of a vehicle to grid services, limitations and their impact on different sectors of the power system. Also, detail review of the impact of coordinated and uncoordinated charging of electric vehicles on a distribution network is presented. Vehicle to grid technology allows bi-directional power flow by providing many other services such as active power support, reactive power compensation and support for renewable energy sources, load leveling and peak load shaving. However, with these services the technology also imposes many challenging issues, such as degradation of battery, high investment cost, and social barriers.
  • Habib BENBOUHENNI , BOUDJEMA Zinelaabidine , Abdelkader BELAIDI Pages 35-45
    This article presents an improved direct vector command (DVC) based on three-level space vector modulation (SVM). The essentiel disadvantage that is usually associated with DVC is the high harmonic current and power ripples. To overcome this disadvantages a SVM technique is proposed based on neural networks technique (NSVM). The neural proposed regulator is shown to be able to reducing the stator reactive and stator active powers ripples and to improve performance DVC command. The validity of the proposed schemes command is confirmed by the simulation results
    Keywords: tor command, space vector modulation, neural space vector modulation, artificial neural networks
  • Hiba Hliwa , Bassam Atieh Pages 47-53
    Differential Drive Mobile Robot is one of the most common and widely used mobile robots. It tracks the desired path depending on its velocity and position information come from various kind of sensors, which detect the robot movement regardless the reasons of the motion (actuators).Differential Drive Mobile Robot is one of the most common and widely used mobile robots. It tracks the desired path depending on its velocity and position information come from various kind of sensors, which detect the robot movement regardless the reasons of the motion (actuators). This research uses Sensorless control based on studying the actuator’s behaviors, choosing the parameters that express its output, finding the relationship between these parameters and the mechanical variables of the robot, and using them in driving the robot to its goal. This research could increase the efficiency of the DC motor and drive robot to its target with acceptable accuracy. Which open doors at further work on monitoring the performance of electrical actuators and get more comprehensive information about the robot to benefit from them to improve the robot performance.
    Keywords: Sensorless control, motor drive, actuators
  • Hojat Khazaee , Abas Rasaeinia Pages 55-62
    A Heat Recovery Steam Generator (HRSG) is in steady state when it converts wasted energy to useful energy for the system. Energy recovery systems are installed for using the wasted energy. Efficiency problems and disturbance decrease in boilers are controversial issues in a complex process with nonlinear parameters, uncertainty and load fluctuations. Predictive control can significantly improve total efficiency and energy recovery in nonlinear systems with high unpredictable losses. Process efficiency can be increased by heat recovery from stack gas flow. In order to increase the efficiency, predictive model is based on PSO algorithm. To decrease the loss, heat recovery boiler output pressure increase, water temperature increase and turbine output pressure decrease are suggested. A boiler in normal operation should have a desired constant steam pressure in drum output. Heat transfer mechanism to evaluate system dynamics includes key process variables responses such as steam pressure, temperature and mass flow. Simulation results show that acceptable error has a difference less than 10% compared to design data. Analyzed variables consist of: gas temperature, fluid temperature, drum pressure, drum fluid level and mass flow in each unit.
    Keywords: economizer, evaporator, control system