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A proposed model for triangular DP surfaces provided in has been found that there is an inappropriate property in its recurrence formulae. That is, it is lack of convexity, i.e., summation of all blending functions for each degree is not equal to one. Although, Later in 2009, A new model of triangular DP surfaces has been proposed, however, this model is still not satisfied linearly independent property...
Increasing electric power demand can cause powers systems to reach stress conditions, resulting in undesirable voltage and frequency condition. Nowadays it is well recognized that by applying the Flexible AC Transmission System (FACTS) controllers, the stability limits can be enhanced significantly. In this paper an optimized Self Tuning Fuzzy PI Controller (STFPIC) is proposed for the TCPST to improve...
In this paper a simplified analysis of the effect of a Thyristeor Controlled Phase Shifter (TCPS) on the stability of a Single machine infinite bus (SMIB) system is presented. The TCPS which is located at the terminal of generator has the PID controller in which the coefficients of PID is optimized by chaos and PSO algorithms in order to damp the Low Frequency Oscillations (LFO). From the first, for...
Recently the use of non-isolated point of load (niPOL) converters powered from an intermediate bus converter (IBC) has become very popular. This paper presents design and simulation of a POL converter. The non-linear effects such as S/H, quantization, delay, and saturation are considered in the closed loop controller designed and simulation in MATLAB environment. The simulation results are given to...
This paper investigates the effect of the conducted EMI (Electromagnetic Interference) and the switching loss which occurs from the switching devices in the switching period of the unipolar and limited unipolar switching circuits. The three main sources of conducted EMI and switching loss in the unipolar and limited unipolar switching circuit come from the switching devices, the number of switching...
Modern graphic cards enable applications to process big amounts of graphical data faster than CPUs, allowing high-volume parallelizable data to be visualized in real-time. In this paper, we present an approach to enable a power grid planning Computer-Aided-Design application to use this processing power to visualize electrical distribution grids in the fastest possible way. As a result, the aforesaid...
For mobile back-lighting applications, a switched-capacitor-based serial DC-DC converter using solar power supplies is proposed in this paper. Unlike conventional switched-capacitor DC-DC converters, the proposed converter pushes up the output voltage of a switched-capacitor-based circuit by the voltage of solar cells. For this reason, the proposed converter can realize not only long battery runtime...
This paper presents the analysis and design of an asymmetrical half-bridge forward converter with current doubler. This converter can minimize the switching power loss by realizing the zero-voltage-switching (ZVS) during the turn-on conditions. The principle of the converter operation is explained and analyzed. In order to achieve the ZVS conditions, the required interlock delay time between gate...
FACTS devices can regulate the active and reactive power as well as voltage-magnitude. Static synchronous compensator (STATCOM) is taking place as of the new generation FACTS devices. The effects of STATCOM using eigenvalues analysis on power systems small signal stability presented in this paper. The simulation of system dynamic behavior is mainly done in the following two cases: classical model...
In this paper, the proposed quasi-orthogonal space time block code (QO-STBC) cooperative communications with relay selection is investigated. The proposed QO-STBC coded cooperative communications provide a good relay selection strategy such that the diversity of four is achieved. In addition, a code rate of the proposed scheme is twice the ordinary cooperative communications. Computer simulation results...
We develop a prototype to demonstrate indoor wireless visible light communications (VLC) in which a panel of red, green, and blue (RGB) light-emitting diodes (LEDs) is used as a transmitter as well as a light source. Digital transmissions of text messages are carried out from the LED panel mounted on top of the room ceiling to the receiver located on the table top 2 m vertically below. Using low-cost...
This paper proposes the MRC-MMSE (Maximal Ratio Combining - Minimum Mean Squared Error) detection of the space time coding over Decode and Forward (DF) cooperative network channel with 16 states binary Rate 2/4 convolutional code. As we employed this convolutional code rate and Alamouti space time scheme, the transmitted signal can be created by two QPSK modulators instead of 16 - PSK or 16-QAM technique...
In this paper, a simultaneous miniaturized and harmonics response suppression of square ring resonator based on inductively compensated microstrip parallel-coupled lines is proposed. The proposed topology with simple design equations is demonstrated with the design operating frequency of 0.9 GHz and less than 3.2 dB insertion losses. More than 26 and 22 dB of spurious suppression performance at the...
Rapidly increasing demands in power systems at present may cause overloading of power system equipment. In some situations, these overloading lead to severe blackout unless proper load shedding is performed in time. The load shedding scheme must be effective and optimal in order to protect the power system from voltage instability. This paper proposes a new load shedding scheme under contingency condition...
Operation lifetime of the X-ray detector is the major factor that defines cost of detector or the actual operation cost of the detector. The purpose of this paper is to study the possibility of operation lifetime extension of the silicon x-ray detector. The study of the device's carrier generation lifetime before and after device exposed to the X-ray for 4 and 150 second at 40, 55 as well as 70 keV...
In this paper, the simulated annealing (SA) is applied to solve the multi-objective optimal placement of distributed generation (DG). The result on the IEEE 30 bus test system shows that the SA can find the optimal location and size with the less computing time than genetic algorithm (GA) and tabu search (TS) as well as the result of multi-objective problem can conclude that the DGs placing in the...
Copper(II)-2,9,16,23-tetra-tertbutyl-29H,31H-phthalocyanine (CuTTBPc) containing inks based on different solvents and solvent mixtures are prepared. Surfactant and different polymers have been added to the ink systems in order to optimize the printing performance. Printability and printing performance have been evaluated. Furthermore the optical properties, namely absorbance in the UV/Vis range, of...
Permanent magnet brushless dc (BLDC) motors are widely used in high performance applications, where torque smoothness is essential. In this paper, commutation torque ripple due to phase commutation of brushless dc motor are described for two commonly used switching schemes. In a conventional three-phase BLDC machine with 120° electrical conduction, commutation torque ripple occurs due to change over...
This paper presents a technique to increase the utilization of the dc-link voltage in order to boost output torque at medium speeds for the current gradient sensorless method. In the original method, the controller operates only in the voltage-controlled mode and applies voltage pulses with a constant duty cycle over the entire conduction period. Therefore, the available reserve of the dc-link voltage...
A new three inputs and single output voltage-mode universal biquadratic filter using only three plus-type differential difference current conveyors, two grounded capacitors and two grounded resistors is presented. The proposed circuit provides highpass, bandpass, lowpass, bandstop, and allpass voltage filters at high-input and low-output impedance, which enable easy cascadability of the circuit. No...
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