List of Articles کنترل افتی

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - Power Sharing Between Islanded Microgrid Inverters by Modifying the Droop Control Method
  kiomars sabzevari
  Introduction: Distributed generation appears as the eco-friendly solution to a growing demand of electricity. Within the same idea, microgrids have become one of the most attractive sources of attention since they integrate local supply sources both with cleanliness and More

  Introduction: Distributed generation appears as the eco-friendly solution to a growing demand of electricity. Within the same idea, microgrids have become one of the most attractive sources of attention since they integrate local supply sources both with cleanliness and robustness. These microgrids can operate either connected to the utility grid, or on their own, namely the islanded mode. In the case of an island microgrid, how to control the DC bus voltage and the energy balance of the microgrid is necessary and essential for its use. Voltage and frequency control as well as active and reactive power sharing between distributed generation sources in island AC microgrids is one of the challenges of microgrid control. One of the control methods of islanded microgrids is to use the common droop control method. Although the droop control method can accurately divide the active power among distributed generation sources; But in the drop control method, reactive power sharing is not accurate.Method: In this article, the adaptive droop control method is used to compensate the voltage drop caused by the line impedance and increase the accuracy of reactive power sharing in the islanded microgrid. Communication between distributed generation sources is used to facilitate the adjustment of adaptive droop control during load changes. In the proposed method, there is an assurance that by cutting the connection between the scattered production sources, if the load does not change, the reactive power sharing will be done accurately. The proposed method has a better performance than the conventional droop control method.Results: The simulation of the proposed control method has been done using Simulink MATLAB. The simulation results show that the proposed control method has accurate reactive power sharing. And it has a better performance than the common drop method.Discussion: In the proposed control method, by compensating the impedance voltage drop of the transmission line to the common point of the units, the power sharing between the inverters is proportional to the capacity of the units. The simulation results show that reactive and active power division is performed accurately with the presence of a communication link between the units. In case of constant load and disconnection between the units, the power sharing between the units is accurate. In the case of disconnection of the communication link between inverters and load change, the proposed control method performs better than the conventional drop control method. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - High-Reliability Electric Power Generation System for Aircraft Based on Generators Smart Droop Control Method
  Amir Khaledian
  Advances in power electronic applications, high reliability power distribution systems and flight control propulsion technologies, have increased the utilization of electric power in modern aircrafts. This has led to the concept of more electric aircraft. In this paper, More

  Advances in power electronic applications, high reliability power distribution systems and flight control propulsion technologies, have increased the utilization of electric power in modern aircrafts. This has led to the concept of more electric aircraft. In this paper, a new structure is proposed to generate the electric power in aircraft. The aircraft power generation and consumption system is modeled as a microgrid. The proposed more-reliable power generation system is based on induction generator, rectifier and voltage source inverter. Induction generator is coupled with turbojet motor. The smart active power sharing between generators is achieved by using improved droop control method. Optimal droop coefficients are assigned by combining mathematical approaches including descending gradient method and minimizing the mean squares of the frequency deviation. The aircraft electrical network is simulated with the proposed controller in MATLAB and its performance is analyzed. The simulation results show the proper power sharing between generators. The advantages of the proposed method over the conventional structure include the elimination of the mechanical constant speed drive which increase reliability and proper power sharing. Manuscript profile