Journal of Artificial Intelligence in Electrical Engineering
Volume:3 Issue: 11, Autumn 2014

In the present study, field oriented control of step motor implementation has been analyzed so that it can make a Sensorless control. Efficiency and Facilities of step motor is more than other types of electromotor. Therefore, the numbers of mechanisms and different types of turning can be made into them. Also controlling these motors is easier than other available motors. Stepping motor has been designed with oriented control in MATLAB software by using a Simulink tool box. In two methods above, current, torque and engine speed have been investigated by and without using Kalman filter. The results showed that using field oriented control can eradicate resonance abnormalities. By using field oriented control, the maximum theoretical engine performance can be achieved.

Today air conditioning systems have been considered by all people as one of welfare requirements in buildings and closed environments. Since a considerable part of energy loss occurs in ordinary modern systems, new strategies and solutions are developed in the field in order to save amount of energy consumption and observe environmental considerations. Fuzzy control is one of these methods which provide a basic powerful rule for decisions made to guarantee optimal use of cooling and heating system. Hence in this research project data measured by environment humidity and temperature were used as input variables and fan speed controller, humidifier, heaters, and compressors were used as output variables to regulate air flow rate and create humidity, cooling and heating conditions in the environment using fuzzy logic for system control.

In this paper the maximum power point tracking (MPPT) algorithms for wind energy systems are reviewed. As the amounts of power produced in wind power plants is changing due to the instantaneous changing nature of the wind, it is desirable to determine the one optimal generator speed that ensures maximum energy yield. Thus, it is important to include a controller that can track the maximum peak regardless of wind speed. Categorizing the MPPT algorithms can be done regarding whether it has used sensors or not, as well as according to the techniques used to locate the peak value. The performance of different MPPT algorithms is compared on the basis of ability to achieve the maximum energy yield and various speed responses. According to available simulation results in the literature, in cases through which the flexibility and simplicity in implementations is considered, the perturbation and observation (P&O) method is preferred, but difficulties in determining the optimum step-size are the restrictions of this method. Due to its simplicity, the best MPPT method for wind energy systems has found to be the optimal torque control (OTC).

In this paper, a new control method based on FEL electro hydraulic servo control with nonlinear flux and internal friction, has been presented. The new approach based on controllers combined by a classic PD controller and a fuzzy controller is smart. This new technique has a good ability to control the performance and stability. Simulations have been carried out in Matlab environment and the results are presented below.

circularly-polarized antenna is built based on 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.

Due to increasingly expansion of energy consumption and also decreasing and tendency towards ending fossil energy reserves, the current energy cycle needs to use alternative energy specially wind energy, because it’s considerably cheaper than other recycling sources. The present research investigates possibility of creating wind Power Station economically at Soltanieh zone of Zanajn province regarding economical perspectives. Cost of investment and other costs and also environmental effects, were assessed economically by considering annual obtained energy rate. Several scenarios were investigated; complete price of energy in every kW per hour at each scenario was calculated and compared with other sources of electricity energy generation especially fossil power stations. By considering obtained results, it’s expected that creating wind power station at Soltanieh zone has yielded economical benefits.