Abstract: Granted by Japan Society for Promotion Science (JSPS), this research deals with two vital problems in installation of Wind Power Generation (WPG) in an Existing Power System (EPS), one is determining the optimal installation bus and the other one is estimating the maximum limitation of WPG that can be safely introduced into EPS. Here, Domain-Link Method (DLM) is used for forming applicable domains based on the structural characteristic of EPS, consequently Maximizing Decision Method (MDM) is used for ensuring the best bus inside selected domain using operational indices of environment, economy, reliability and stability. The limitation of WPG is estimated after connecting WPG to the selected bus based on system steady constrains. The result is illustrated using the IEEE 30-Bus test system. Successive installation of WPG may be conducted with the same procedure satisfying new EPS constrains resulted from the previous installation. Other than complex computation process, this methodology shows its unique feasibility in application of WPG installation to EPS of different structure and capacity.

Abstract: Transmission expansion planning (TEP) is one of the most important parts of expansion planning in power systems. Competition in these systems has resulted in essential changes in TEP models and criteria. While methods introduced so far are essentially based on dc load flow, the proposed method utilizes the ac optimal power flow (OPF) in order to model the real world condition and obtaining optimal plans. Furthermore, in order to model the operation and investment costs, transmission tariffs are used. Investigation on 8-bus system confirms the advantages of the proposed method as compared with previously presented approaches.

 **Department Electrical & Computer Engineering, Sultan Qaboos University, Muscat, Oman

Abstract: Stabilizers design for Static Var Compensators (SVCs) with fixed parameters can be adequate for some load characteristics but contrarily reduce system damping and contribute to system instability with loads having other characteristics. This paper proposed a novel stabilizer design for SVCs to enhance power systems damping in the presence of voltage-dependent load characteristics uncertainty. The proposed SVC stabilizer is based on a simple hierarchal self organizing fuzzy controller (SOFC) scheme. The SOFC has two levels, the main controller and the fuzzy gain controller. The later is responsible for on line tuning the main controller gains according to load characteristics variations. Computer simulation results show that the proposed SOFC SVC stabilizer provides better damping to the power system and it was able to keep system stability where conventional control techniques fail.

Abstract: This paper presents a new space vector pulsewidth modulation (SVPWM) algorithm for reduction of common mode voltage in direct torque controlled induction motor drives. The proposed PWM algorithm does not use any zero voltage vectors for inverter control; hence it can restrict common mode voltage better than conventional SVPWM algorithm. The main advantage of the proposed algorithm is that the number of commutations required in one sector and from one sector to the next sector remains the same as in conventional SVPWM technique. To validate the proposed method, the simulation results are presented and compared to those obtained with conventional SVPWM based direct torque control algorithm.

** Department of Electrical Engineering and with the Center of Excellence for Power System Automation and Operation, Iran University of Science and Technology, Tehran

Abstract: In this paper, a new structure for bilateral teleoperation systems with bounded uncertain time delay in communication channel is proposed. The main contributions of the proposed method are two folds: 1) complete transparency for the system and 2) stability robustness. Moreover, due to the proposed structure, stability can be checked graphically using simple classical control methods, such as Bode plot. The key features of this structure are its simple design as well as the ability to analyze the stability of the closed-loop system using the property of the stable scalar functions and the small gain theorem. In the proposed structure, two local controllers will be designed, such that the transparency of the teleoperated system and the local stabilities are guaranteed. One local controller will be designated for position tracking of the slave system and the other one, whilst ensuring the stability of the closed-loop system in presence of uncertain time delay in communication channel, performs the force tracking. Simulation results demonstrate that the proposed control method is highly effective in providing a stable transparent teleoperation system under uncertain, but bounded, time delay in communication channel.

* Ohio University, Athens, OH 45701, USA
** South African National Bioinformatics Institute (SANBI), University of the Western Cape, Bellville 7535, South Africa

Abstract: A new, input-output based discrete sliding mode control (DSMC) method is proposed for the control of processes with dead-time. However, it is necessary to combine DSMC with the Smith predictor for the dead-time compensation of processes with long dead-time. Because DSMC is sensitive to apparent dead-time in the process to be controlled, two Smith predictors were used in the control schema. One with high order is used to cancel out actual process output signal as good as possible. Another one with low order is used in the identification of the controlled process and in the design of DSMC. When this new DSMC is compared to the optimally tuned PID controller, it shows much better overall characteristics. Simulation experiments are made to illustrate the effectiveness of the new DSMC both for plants with short and with long dead-times.

Abstract: This paper investigates resonance phenomenon in active filters. The paper studies the effect of system/filter parameters on resonance conditions. It also proposes an active technique for damping such resonances. The study is based on modal analysis in which unstable modes or modes with slow damping are first extracted. Then, using a new technique, such modes are considerably damped. PSCAD/EMTDC software is also employed to verify the performance of the proposed technique.

* Islamic Azad University, Tehran, Iran
** Electrical Engineering Department at Amirkabir University, Tehran, Iran

Abstract:

This paper describes the implementation of an active integrated spiral antenna for Ultra-Wideband (UWB) applications. By integrating a low–noise amplifier (LNA) with an antenna, the voltage standing wave ratio (VSWR) can be kept low for a large bandwidth and this antenna indicates a 13 dB improvement in gain compared with one using a passive antenna having the same design, resulting in an improved spiral antenna performance for UWB. For the designed circuit in the UWB frequency range (3.1-10.6 GHz), the gain of the LNA is better than 13dB, its noise figure is less than 3dB, and both  and  are less than -13dB.

* SEPI ESIME Zacatenco, National Polytechnic Institute of México, México
**ESIME Culhuacan, National Polytechnic Institute of México, México

Abstract: A novel method to determine the characteristic impedance of a rectangular transmission line, through the evaluation of lumped parameters, is presented. Leaving of the current distribution that circulates in the central conductor is also compared with a technique that leaves the determination of the magnetic field inside the structure. The obtained results were satisfactory.