فهرست مطالب

Artificial Intelligence in Electrical Engineering - Volume:4 Issue:14, 2016
  • Volume:4 Issue:14, 2016
  • 60 صفحه،
  • تاریخ انتشار: 1394/12/05
  • تعداد عناوین: 6
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  • Shiva Alipour Ghorbani, Hossein Nasiraghdam Page 1
    The issue of unit commitment is one of the most important economic plans in power system. In modern and traditional power systems, in addition to being economical of the planning, the issue of security in unit operation is also of great importance. Hence power system operation confronts units’ participation and input considering network security constrains. The issue of units’ participation is defined as an optimization problem aimed at determining units'' on or off condition and optimized level of units’ production.
    Keywords: particle swarm optimization, unit commitment, security, constrained unit commitment, SCUC
  • Mortaza Sefidi, Mehdi Jarahi Page 9
    Multilevel Inverters has big placement advantages in Power Electronics and its application can be mentioned to FACTS tools such as UPFC – D-STATCOM. Therefore, nowadays Multilevel Inverters have created vast field’s research and researchers are trying to present appropriate structures with fewer keys and greater advantages. The main advantages of Multilevel Inverters mentioned are low-key voltage stress and low harmonic content of the output voltage. Multilevel Inverters, having many advantages, can be referred to have low volume, low EMI, low losses and high efficiency. In this study, all equations dominating the circuit have been investigated and main and effective parameters have been identified in suggested Invertors and this method has been extended for use in n levels Invertors. Then it has investigated the changes possibility in the Invertors’ structure aiming to reduce dc voltage and to increase the number of output voltage levels. The results of simulations have emphasized the suggested structures.
    Keywords: Inverter, Cascade hybrid, Pulse with Modulation, Seven Levels
  • Hadi Abbasnejad Page 19
    Mathematical models can simulate the growth and proliferation of cells in the interaction with healthy cells، the immune system and measure the toxicity of drug and its effects on healthy tissue pay. One of the main goals of modeling the structure and growth of cancer cells is to find a control model suitable for administration among patients. In this study، a new mathematical model is designed to describe the changes in different phases of the cycle T cell proliferation، the population of immune cells، the proposed concentration of drug toxicity and treatment using differential equation and fuzzy Lyapunov stability، an optimal treatment protocol. One feature to consider is the rate of clearance of the drug in the body.
    Keywords: The optimal treatment protocol, Mathematical modeling of cancer, fuzzy differential equations, Lyapunov stability criteria
  • Mohammad Taghi Babajani Baghmishezad, Hosein Nasiraghdam Page 29
    In this paper, reconfiguration problem of distribution network has been investigated to improve reliability and reduce power loss by placement of renewable energy sources; i.e. solar cell and wind turbine. For this, four reliability indices are considered in objective function; which are as follows: System Average Interruption Frequency Index (SAIFI), System Average Interruption Duration Index (SAIDI), Cost of Energy Not Supplied (CENS), and Momentary Average Interruption Frequency Index (MAIFI). By using a novel technique, the target function was normalized. Simulation has been performed on IEEE 69-bus test system. A genetic algorithm could solve this nonlinear problem.
    Keywords: Reconfiguration, Solar cell, Wind turbine, Genetic algorithm, power loss reduction, reliability improvement
  • Omid Khodadad, Pejman Mohammadi Page 39
    Circularly-polarized antenna is built based on a new SIW (substrate integrated waveguide) structure which contains cavity-backed resonator and a conventional polarized ring with two square slits in inner and outer ring that differ 90° at position and is proposed for right-handed circular polarization (RHCP) and fabricated in two separate layers. A broadband impedance bandwidth of 13.9% and a RHCP axial ratio of 0.5GHz have been obtained under the condition of less than VSWR ≤2 and axial ratio≤ 3 dB, respectively.
    Keywords: PCB, SIW, HMSIW, QMSIW, HFSS, RHCP
  • Alireza Tofigh Rihani, Majid Ghandchi Page 45
    Using Photovoltaic systems is gradually expanded by increasing energy demand. Abundance and availability of this energy, has turned to one of the most important sources of renewable energy. Unfortunately, photovoltaic systems have two big problems: first, those have very low energy conversion efficiency (in act between 12 and 42 percent under certain circumstances). Second, the power produced by the solar cell depends on nonlinear conditions such as solar radiation, temperature and charge feature. According to this, received power maximum of photovoltaic cells depends on different non-linear variables, it is necessary to be continuously traced, as maximum received power of the cell (by controller). In this research, the increasing efficiency of photovoltaic systems has been investigated by using Maximum Power Point Tracking (MPPT) in two different modes contained connected to the Grid and disconnected from the grid with simulation by MATLAB software. The obtained results showed that the proposed technique is able to improve the current, voltage and power output of photovoltaic cells.
    Keywords: photovoltaic cell, MPPT, renewable energy, production power