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Javad Tousi,Marzieh Kamali,Iman Izadi,Farid Sheikholeslam 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.6
In this paper a distributed adaptive dynamic surface controller is proposed for multi-agent systems under fixed directed graph topologies. The agents have uncertain nonlinear dynamics and are influenced by bounded unknown disturbances. The controller should synchronize the states of all agents with the corresponding states of the nonautonomous leader. It is proved that, with the proposed controller, the synchronization error remains bounded; and the bounds can be arbitrarily decreased by increasing the controller gains. The control rules are designed such that each agent only requires the state information of its neighbors, rendering a distributed control. The effectiveness of the proposed method is demonstrated through two simulation examples.
Sattarpour, Tohid,Tousi, Behrouz The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.6
Recently, owing to increased interest in low-carbon energy supplies, renewable energy sources such as photovoltaics and wind turbines in distribution networks have received considerable attention for generating clean and unlimited energy. The presence of energy storage systems (ESSs) in the promising field of active distribution networks (ADNs) would have direct impact on power system problems such as encountered in probabilistic distributed generation (DG) model studies. Hence, the optimal procedure is offered herein, in which the simultaneous placement of an ESS, photovoltaic-based DG, and wind turbine-based DG in an ADN is taken into account. The main goal of this paper is to maximize the net present value of the loss reduction benefit by considering the price of electricity for each load state. The proposed framework consists of a scenario tree method for covering the existing uncertainties in the distribution network's load demand as well as DG. The collected results verify the considerable effect of concurrent installation of probabilistic DG models and an ESS in defining the optimum site of DG and the ESS and they demonstrate that the optimum operation of an ESS in the ADN is consequently related to the highest value of the loss reduction benefit in long-term planning as well. The results obtained are encouraging.
Mostafa Barzegar Kalashani,Behrouz-Tousi 한국전기전자재료학회 2018 Transactions on Electrical and Electronic Material Vol.19 No.6
Incapability under faulty conditions is one of the most important problems of induction motor drives which are controlledby multilevel inverters. This paper investigates a modular multilevel inverter which is employed as an induction motor drivewith capability of operation under normal and faulty conditions. For this aim, diff erent switching scenarios have been defi nedfor each switch under faulty conditions. In this method, when one of the switches is faulted, the switching scenario is alteredand the motor operates in its normal mode although a percent of output power is lost. One of the most important factors inmultilevel inverter design is the number of the power electronic elements which directly infl uences the cost of the system. From this view point, the presented multilevel inverter structure employs fewer number of power electronic elements in comparisonwith other conventional multilevel inverter topologies. The other advantage of the presented topology is its capabilityto cascade diff erent units which can be used for high power motor applications. To illustrate the effi ciency of the proposedsystem, a closed loop indirect fi eld oriented control method has been applied to the suggested topology. Diff erent scenariosincluding normal and abnormal conditions have been applied to the system. To verify the valid operation of the presentedsystem, a 15 kW three phase induction motor is selected and simulated using MATLAB/Simulink software. According tothe analysis and simulation results, the presented system shows a good performance under various conditions. In addition,good voltage balancing and low total harmonic distortion are the main features of the proposed system.
φ-FRAMES AND φ-RIESZ BASES ON LOCALLY COMPACT ABELIAN GROUPS
Gol, Rajab Ali Kamyabi,Tousi, Reihaneh Raisi Korean Mathematical Society 2011 대한수학회지 Vol.48 No.5
We introduce ${\varphi}$-frames in $L^2$(G), as a generalization of a-frames defined in [8], where G is a locally compact Abelian group and ${\varphi}$ is a topological automorphism on G. We give a characterization of ${\varphi}$-frames with regard to usual frames in $L^2$(G) and show that ${\varphi}$-frames share several useful properties with frames. We define the associated ${\varphi}$-analysis and ${\varphi}$-preframe operators, with which we obtain criteria for a sequence to be a ${\varphi}$-frame or a ${\varphi}$-Bessel sequence. We also define ${\varphi}$-Riesz bases in $L^2$(G) and establish equivalent conditions for a sequence in $L^2$(G) to be a ${\varphi}$-Riesz basis.
M. Boroumand,A. M. Tousi 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.4
High efficiency and high reliability with low emission of solid oxide fuel cell make them one of the best choices for distributed generation systems. Furthermore, the gas turbine power generation systems are completely developed in recent decades. Hybrid cycle of SOFC and gas turbine gathers these points and introduces the highest possible efficient system for building heating and power. The behavior of this cycle can be studied from a model of fuel cell, gas turbine and balance of plant. For each component a model is developed and the performance of the overall system analyzed by integrating each model. Load variation for SOFC-GT hybrid cycle in residential application is very wide. To adjust the net power and choosing best operation point for SOFC-GT hybrid cycle, an inlet guide vane (IGV) is used in the inlet of the compressor. In this study by using a dynamic model, transient effect of IGV angle on performance of SOFC-GT hybrid cycle is investigated. Also this model can be used for designing a controller for safe operation of this cycle while satisfying constraints of the hybrid cycle. Results showed that by using IGV, the off-design performance of the SOFC-GT cycle is enhanced.
SOME REMARKS ON COAASSOCIATED PRIMES
Divaani-Aazar, K.,Tousi, M. Korean Mathematical Society 1999 대한수학회지 Vol.36 No.5
The purpose of this paper is to develop the theory of coassociated primes and to investigate Melkersson's question [8].
Tohid Sattarpour,Behrouz-Tousi 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.6
Recently, owing to increased interest in low-carbon energy supplies, renewable energy sources such as photovoltaics andwind turbines in distribution networks have received considerable attention for generating clean and unlimited energy. The presence of energy storage systems (ESSs) in the promising field of active distribution networks (ADNs) would havedirect impact on power system problems such as encountered in probabilistic distributed generation (DG) model studies. Hence, the optimal procedure is offered herein, in which the simultaneous placement of an ESS, photovoltaic-based DG, andwind turbine-based DG in an ADN is taken into account. The main goal of this paper is to maximize the net present valueof the loss reduction benefit by considering the price of electricity for each load state. The proposed framework consists ofa scenario tree method for covering the existing uncertainties in the distribution network’s load demand as well as DG. Thecollected results verify the considerable effect of concurrent installation of probabilistic DG models and an ESS in definingthe optimum site of DG and the ESS and they demonstrate that the optimum operation of an ESS in the ADN is consequentlyrelated to the highest value of the loss reduction benefit in long-term planning as well. The results obtained are encouraging.
Transient Stability Enhancement by DSSC with Fuzzy Supplementary Controller
Mansour-Khalilian,Maghsoud-Mokhtari,Daryoosh-Nazarpour,Behrouz-Tousi 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.3
The distributed flexible alternative current transmission system (D-FACTS) is a recently developed FACTS technology. Distributed Static Series Compensator (DSSC) is one example of DFACTS devices. DSSC functions in the same way as a Static Synchronous Series Compensator (SSSC), but is smaller in size, lower in price, and possesses more capabilities. Likewise, DSSC lies in transmission lines in a distributed manner. In this work, we designed a fuzzy logic controller to use the DSSC for enhancing transient stability in a two-machine, two-area power system. The parameters of the fuzzy logic controller are varied widely by a suitable choice of membership function and parameters in the rule base. Simulation results demonstrate the effectiveness of the fuzzy controller for transient stability enhancement by DSSC.
φ-FRAMES AND φ-RIESZ BASES ON LOCALLY COMPACT ABELIAN GROUPS
Rajab Ali Kamyabi Gol,Reihaneh Raisi Tousi 대한수학회 2011 대한수학회지 Vol.48 No.5
We introduce φ-frames in L^2(G), as a generalization of a-frames dened in [8], where G is a locally compact Abelian group and φ is a topological automorphism on G. We give a characterization of φ-frames with regard to usual frames in L^2(G) and show that φ-frames share several useful properties with frames. We dene the associated φ-analysis and φ-preframe operators, with which we obtain criteria for a sequence to be a φ-frame or a φ-Bessel sequence. We also define φ-Riesz bases in L^2(G) and establish equivalent conditions for a sequence in L^2(G) to be a φ-Riesz basis.