- Cairo, Muhafazat al Qahirah, Egypt
Page 1. IEEE PEDS 2005 Advanced High Power DC-DC Converter using Novel Type Half-Bridge Soft Switching PWM Inverter with High Frequency Transformer for Arc Welder Keiki Morimoto Nabil A. Ahmed Hyun - Woo Lee Toshimitsu Doi Mutsuo Nakaoka... more
Page 1. IEEE PEDS 2005 Advanced High Power DC-DC Converter using Novel Type Half-Bridge Soft Switching PWM Inverter with High Frequency Transformer for Arc Welder Keiki Morimoto Nabil A. Ahmed Hyun - Woo Lee Toshimitsu Doi Mutsuo Nakaoka ...
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Abstract-This paper presents a novel dynamic model in the stationary reference frame for a diode bridge rectifier with a DC-link filter directly connected to a three-phase induction generator (IG). Moreover, a hybrid excitation system,... more
Abstract-This paper presents a novel dynamic model in the stationary reference frame for a diode bridge rectifier with a DC-link filter directly connected to a three-phase induction generator (IG). Moreover, a hybrid excitation system, consisting of a capacitor bank and an active ...
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The main result gives a sufficient condition for a classK of finite dimensional cylindric algebras to have the property that not every epimorphism in K is surjective. In particular, not all epimorphisms are surjective in the classes CAn... more
The main result gives a sufficient condition for a classK of finite dimensional cylindric algebras to have the property that not every epimorphism in K is surjective. In particular, not all epimorphisms are surjective in the classes CAn of n-dimensional cylindric algebras and the class of representable algebras in CAn for finite n > 1, solving Problem 10 of (28)
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... Advanced Active Power Filter Controlled permanent-magnet synchronous generator for Automotive Applications Katsumi Nishida Tarek Ahmed Mutsuo Nakaoka Ube National College of Technology ... i l (k) i lu i lv DC Load Rdc Lf Cf ... i cu... more
... Advanced Active Power Filter Controlled permanent-magnet synchronous generator for Automotive Applications Katsumi Nishida Tarek Ahmed Mutsuo Nakaoka Ube National College of Technology ... i l (k) i lu i lv DC Load Rdc Lf Cf ... i cu i cv Phase Locked Loop AC Load Sw ...
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Interior permanent magnet synchronous generator (IPMSG) has several advantages such as high efficiency and high power-to-weight ratio because of its additionally developed reluctance torque. Therefore, a novel IPMSG system using a... more
Interior permanent magnet synchronous generator (IPMSG) has several advantages such as high efficiency and high power-to-weight ratio because of its additionally developed reluctance torque. Therefore, a novel IPMSG system using a well-designed phase locked-loop circuit (PLL) and interface filters is proposed. Owing to introducing the two devices, the PLL and interface filters, the direction of the quadrature axis of the
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In this paper, the advanced electric technologies for grid power integration of different offshore wave energy conversion devices are presented. The electrical connection configurations for integrating the electric power of the multi wave... more
In this paper, the advanced electric technologies for grid power integration of different offshore wave energy conversion devices are presented. The electrical connection configurations for integrating the electric power of the multi wave energy conversion devices such as the Oscillating Water Column, Pelamis, the Wave Point Absorbers and the Wave Dragon are developed by employing the most efficient low cost
... Inverter with A Novel Quasi Resonant DC Link Snubber Tarek Ahmed, Mutsuo Nakaoka Yamaguchi University 2-16-1 Tokiwadai, Ube Yamaguchi, Japan 755-8611 tarek@pe-news1. eee.yamaguchi-u.ac.jp Shinichiro Nagai Sanken Electric Co., Ltd. ...
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... Generator and Multi-pulse Rectifier Katsumi Nishida Tarek Ahmed Mutuo Nakaoka ... This scheme is low cost when compared with the full power converter. When the speed of the generator alters, the voltage value on the dc side of the... more
... Generator and Multi-pulse Rectifier Katsumi Nishida Tarek Ahmed Mutuo Nakaoka ... This scheme is low cost when compared with the full power converter. When the speed of the generator alters, the voltage value on the dc side of the diode rectifier will change. ...
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The conduction losses of the active switches can be lowered, which are connected to the primary side of extremely step-down high frequency transformer because of low voltage large current rectifier configuration. This paper presents two... more
The conduction losses of the active switches can be lowered, which are connected to the primary side of extremely step-down high frequency transformer because of low voltage large current rectifier configuration. This paper presents two new circuit topologies of DC busline side active edge resonant snubber assisted soft-switching PWM full-bridge DC-DC converter acceptable for either utility AC 200 V-rms or
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Page 1. Quasi-Resonant Dual Mode Soft Switching PWM and PDM High-Frequency Inverter with IH Load Resonant Tank Nabil A.Ahmed, Ahmad Eid, Hyun Woo Lee and Mutsuo Nakaoka Kyungnam University The Electric Energy ...
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The 30th Annual Conference of the lEEE Industrial Electronics Society, November 2 - 6,2004, Busan, Korea ... Commercial Utility Frequency AC to High Frequency AC Soft Switching Power Conversion Circuit with Non Smoothing DC Llnk for IH... more
The 30th Annual Conference of the lEEE Industrial Electronics Society, November 2 - 6,2004, Busan, Korea ... Commercial Utility Frequency AC to High Frequency AC Soft Switching Power Conversion Circuit with Non Smoothing DC Llnk for IH Dual Packs Heater
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Abstract Following research initiated by Tarski, Craig and Németi, and futher pursued by Sain and others, we show that for certain subsets G of ω ω, atomic countable G polyadic algebras are completely representable. G polyadic algebras... more
Abstract Following research initiated by Tarski, Craig and Németi, and futher pursued by Sain and others, we show that for certain subsets G of ω ω, atomic countable G polyadic algebras are completely representable. G polyadic algebras are obtained by restricting ...
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Abstract SC, CA, QA and QEA denote the class of Pinter's substitution algebras, Tarski's cylindric algebras, Halmos' quasi-polyadic and quasi-polyadic equality algebras, respectively. Let 2< n< m ≤ ω. and K ∈ {SC, CA,... more
Abstract SC, CA, QA and QEA denote the class of Pinter's substitution algebras, Tarski's cylindric algebras, Halmos' quasi-polyadic and quasi-polyadic equality algebras, respectively. Let 2< n< m ≤ ω. and K ∈ {SC, CA, QA, QEA\}. We show that the class of n ...
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Let 1 < n < ω and β > n. We show that the class Nr n CA β of n-dimensional neat reducts of β-dimensional cylindric algebras is not closed under forming elementary subalgebras. This solves a long-standing open problem of Tarski... more
Let 1 < n < ω and β > n. We show that the class Nr n CA β of n-dimensional neat reducts of β-dimensional cylindric algebras is not closed under forming elementary subalgebras. This solves a long-standing open problem of Tarski and his co-authors Andréka, Henkin, Monk and ...
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We review, and in the process unify two techniques (due to Németi and Pigozzi), for proving results con-cerning amalgamation in several classes studied in algebraic logic. The logical counterpart of these results adress interpolation and... more
We review, and in the process unify two techniques (due to Németi and Pigozzi), for proving results con-cerning amalgamation in several classes studied in algebraic logic. The logical counterpart of these results adress interpolation and definability properties in modal and algebraic ...
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Let V be a class of algebras (usually but not always assumed to be a variety) and L 1 , L 2 ⊆ V. L 2 is said to have the amalgamation property, or AP for short over L 1 , with respect to V, if for all , all and , and all monomorphisms i 1... more
Let V be a class of algebras (usually but not always assumed to be a variety) and L 1 , L 2 ⊆ V. L 2 is said to have the amalgamation property, or AP for short over L 1 , with respect to V, if for all , all and , and all monomorphisms i 1 and i 2 of into , , respectively, there exists , a ...
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We prove that the existence of atomic models for countable atomic theories does not hold for Ln the first order logic restricted to n variables for finite n &amp;gt; 2. Our proof is algebraic, via polyadic algebras. We note that Lnhas... more
We prove that the existence of atomic models for countable atomic theories does not hold for Ln the first order logic restricted to n variables for finite n &amp;gt; 2. Our proof is algebraic, via polyadic algebras. We note that Lnhas been studied in recent times as a multi-modal logic with applications in computer science.2000 MATHEMATICS SUBJECT CLASSIFICATION. 03C07, 03G15.
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In this paper, the advanced electric technologies for grid power integration of different offshore wave energy conversion devices are presented. The electrical connection configurations for integrating the electric power of the multi wave... more
In this paper, the advanced electric technologies for grid power integration of different offshore wave energy conversion devices are presented. The electrical connection configurations for integrating the electric power of the multi wave energy conversion devices such as the Oscillating Water Column, Pelamis, the Wave Point Absorbers and the Wave Dragon are developed by employing the most efficient low cost
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... e e c S K K)s(G I P + = a a b b VSPM such as Wind Turbine single-phase SEIG experimentally separately-excited dc motor modelling with field current control single-phase transformer n=240/6 n: turns ratio −jXC −jXTSC jX TCR jX L R L V... more
... e e c S K K)s(G I P + = a a b b VSPM such as Wind Turbine single-phase SEIG experimentally separately-excited dc motor modelling with field current control single-phase transformer n=240/6 n: turns ratio −jXC −jXTSC jX TCR jX L R L V L ...
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Abstract: The paper describes a simple control structure for a vector-controlled stand-alone induc-tion generator (IG) used to operate under variable speeds. Deadbeat current control is developed for a voltage source PWM converter and the... more
Abstract: The paper describes a simple control structure for a vector-controlled stand-alone induc-tion generator (IG) used to operate under variable speeds. Deadbeat current control is developed for a voltage source PWM converter and the three-phase variable speed ...
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ABSTRACT A hybrid excitation system is presented, consisting of a capacitor bank with a small-scale active power filter (APF), to regulate the output voltage of the stand-alone induction generator (IG) by controlling its reactive current... more
ABSTRACT A hybrid excitation system is presented, consisting of a capacitor bank with a small-scale active power filter (APF), to regulate the output voltage of the stand-alone induction generator (IG) by controlling its reactive current component and to filter the harmonic currents generated by a nonlinear diode rectifier load. A deadbeat current control structure for pulse-width modulation APF connected to a stand-alone IG working with variable speed and different types of loads is proposed to enhance the operating performance of the stand-alone IG. Sensorless control of the IG, meaning current vector control without voltage sensor and mechanical shaft sensor, is considered and the fixed command control for the IG line-to-line voltage is achieved with high accuracy. In the proposed system a new design of phase-locked-loop circuit is used to determine the stator voltage vector position of the IG. A 2.2 kW laboratory prototype has been built to confirm the feasibility of the proposed method. The measurement results validate the proposed power generating system with the deadbeat current controller as a good application for the IG to reduce the total system cost.
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... and can be represented by [6], [7] (2) where and are, respectively, the torque coefficient and the speed coefficient in newton meters. In the experiment, a controllable separately excited dc motor is used with a constant armature... more
... and can be represented by [6], [7] (2) where and are, respectively, the torque coefficient and the speed coefficient in newton meters. In the experiment, a controllable separately excited dc motor is used with a constant armature voltage and a field current Page 4. ... control. Fig. ...
Research Interests: Engineering, Renewable Energy, GAS TURBINE, Alternative Energy, Performance Evaluation, and 14 moreWind turbine, Equivalent Circuit, Steady state, High performance, Voltage regulator, Feedback loop, Rural Area, Switched Capacitor Filters, Simulation Analysis, PI Controller, Proportional Integral Controllers, Static VAR Compensator (SVC), Self Excited Induction Generator, and Frequency Domain
In this paper, a novel grid integration system for a variable-speed wind turbine using an interior permanent-magnet synchronous generator (IPMSG) is developed. The power condi- tioner system (PCS) consists of a series-type 12-pulse... more
In this paper, a novel grid integration system for a variable-speed wind turbine using an interior permanent-magnet synchronous generator (IPMSG) is developed. The power condi- tioner system (PCS) consists of a series-type 12-pulse uncontrolled diode rectifier powered by a phase-shifting transformer and then cascaded to a pulsewidth-modulated (PWM) voltage source in- verter. The active current of the grid-side PWM inverter is only controlled to follow the optimal active current reference which is determined by using a simple maximum power point tracking (MPPT) control strategy. The MPPT algorithm requires only three sensors in order to track the maximum power of the wind turbine. The most significant advantage of the proposed system is that the passive filter together with a series-type 12-pulse rectifier provides high efficiency by compensating the power factor angle of the IPMSG and suppresses distortions presented in the IPMSG voltages and currents. The laboratory results indicate that the proposed construction and scheme are simple, cheap, and efficient. Index Terms—Grid integration, interior permanent-magnet synchronous generator (IPMSG), maximum power point tracking (MPPT) control strategy, power conditioner system (PCS), wind turbine.
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AbstractThis paper describes simple control structures for the vector-controlled stand-alone induction generator (IG) used to operate under variable speeds. Different control principles, indi-rect vector control and deadbeat current... more
AbstractThis paper describes simple control structures for the vector-controlled stand-alone induction generator (IG) used to operate under variable speeds. Different control principles, indi-rect vector control and deadbeat current control, are developed for a voltage source ...
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Abstract This paper presents a novel dynamic model in the stationary reference frame for a diode bridge rectifier with a DC-link filter directly connected to an induction generator (IG). Moreover, a hybrid excitation system, consisting of... more
Abstract This paper presents a novel dynamic model in the stationary reference frame for a diode bridge rectifier with a DC-link filter directly connected to an induction generator (IG). Moreover, a hybrid excitation system, consisting of a capacitor bank with a small-scale ...
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This paper proposes a new circuit topology of the three-phase soft switching PWM inverter and PFC converter using IGBT power modules, which has the improved active auxiliary switch and edge resonant bridge leg-commutation-link... more
This paper proposes a new circuit topology of the three-phase soft switching PWM inverter and PFC converter using IGBT power modules, which has the improved active auxiliary switch and edge resonant bridge leg-commutation-link soft-switching snubber circuit with pulse current regenerative feedback loop as compared with the typical auxiliary resonant pole snubber discussed previously. This three-phase soft switching PWM double converter
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... Regulated DC Voltage Scheme for Wind Power Applications Tarek Ahmed, Katsumi Nishida and Mutsuo Nakaoka The Graduate School of Science and Engineering, Yamaguchi Univ. 2-16-1 Tokiwadai, Ube Yamaguchi, Japan 755-8611 tarek@pe-news 1... more
... Regulated DC Voltage Scheme for Wind Power Applications Tarek Ahmed, Katsumi Nishida and Mutsuo Nakaoka The Graduate School of Science and Engineering, Yamaguchi Univ. 2-16-1 Tokiwadai, Ube Yamaguchi, Japan 755-8611 tarek@pe-news 1 .eee.yamaguchi-u. ac. ...
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In this paper, the terminal voltage of the three-phase self-excited induction generator (SEIG) driven by a variable-speed prime mover (VSPM) is maintained constant by using static VAr compensator (SVC) and the AC load voltage regulator... more
In this paper, the terminal voltage of the three-phase self-excited induction generator (SEIG) driven by a variable-speed prime mover (VSPM) is maintained constant by using static VAr compensator (SVC) and the AC load voltage regulator (AC-LVR) for DC ...
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A three-phase induction machine-based wind power generation scheme is proposed. This scheme uses a low-cost diode bridge rectifier connected to the induction machine via the AC load voltage regulator (AC-LVR) to transfer DC power with... more
A three-phase induction machine-based wind power generation scheme is proposed. This scheme uses a low-cost diode bridge rectifier connected to the induction machine via the AC load voltage regulator (AC-LVR) to transfer DC power with voltage ...
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This paper describes a simple control structure and power conditioning system for indirect vector controlled standalone induction generator (IG) used to operate under variable speeds and different load types. The required reactive power... more
This paper describes a simple control structure and power conditioning system for indirect vector controlled standalone induction generator (IG) used to operate under variable speeds and different load types. The required reactive power for the IG system is supplied ...
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This paper describes simple control structures for vector controlled stand-alone induction generator (IG) used to operate under variable speeds. Different control principles, indirect vector control and deadbeat current control, are... more
This paper describes simple control structures for vector controlled stand-alone induction generator (IG) used to operate under variable speeds. Different control principles, indirect vector control and deadbeat current control, are developed for a voltage source ...
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This paper presents a new circuit topology of dc busline switch-assisted full-bridge soft-switching PWM inverter type dc-dc power converter which is composed of typical voltage source H full-bridge type high frequency PWM inverter in... more
This paper presents a new circuit topology of dc busline switch-assisted full-bridge soft-switching PWM inverter type dc-dc power converter which is composed of typical voltage source H full-bridge type high frequency PWM inverter in addition to a single dc ...
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Abstract--This paper deals a deadbeat current control implementation of voltage source shunt-type single-phase active power filter (APF). Although the one-dimensional deadbeat control method can attain time-optimal responses of APF... more
Abstract--This paper deals a deadbeat current control implementation of voltage source shunt-type single-phase active power filter (APF). Although the one-dimensional deadbeat control method can attain time-optimal responses of APF compensating current, one sampling ...
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2*3 The Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi, Japan %'The Etectric Energy Saving Research Center, Kyungnam University, Masan, Korea e-mail: tarekape-news 1 .eee.yamaguchi-u.ac.jp ... Abslmct-In... more
2*3 The Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi, Japan %'The Etectric Energy Saving Research Center, Kyungnam University, Masan, Korea e-mail: tarekape-news 1 .eee.yamaguchi-u.ac.jp ... Abslmct-In this paper, a three-phase ...
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In this paper, the single-phase static VAR compensator (SVC) is applied to regulate and stabilize smoothly the generated output voltage of the single-phase self-excited induction generator (single-phase SEIG) driven by a variable-speed... more
In this paper, the single-phase static VAR compensator (SVC) is applied to regulate and stabilize smoothly the generated output voltage of the single-phase self-excited induction generator (single-phase SEIG) driven by a variable-speed prime mover (VSPM) under the ...
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Page 1. Voltage Phase Detection Load Current Detection APF. Current Detection APF (Three-Phase Voltage Sourse Inverter) icd(k) icq(k) icd*(k+2) icq*(k+2) icd*(k) icq*(k) Lc il is ic + − + − Ls εd(k) εq(k) gate pulse PI Conroller DC... more
Page 1. Voltage Phase Detection Load Current Detection APF. Current Detection APF (Three-Phase Voltage Sourse Inverter) icd(k) icq(k) icd*(k+2) icq*(k+2) icd*(k) icq*(k) Lc il is ic + − + − Ls εd(k) εq(k) gate pulse PI Conroller DC Voltage Detection Vdc Vdc* ihd*(k) ...
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Page 1. Three-Phase Self-Excited Induction Generator Driven by Variable-Speed Prime Mover for Clean Renewable Energy Utilizations and Its Terminal Voltage Regulation Characteristics by Static VAR Compensator Tarek ...
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... Laknath Gamage, Tarek Ahmed, Hisayuki Sugimura, Srawouth Chandhaket Mutsuo Nakaoka(Prof.Dr-Eng ... invcrtcr with auxiliary passive capasitivc snubbcrs.and active rcsonant AC link load ... 15. Auxiliary rcsonant DC link soft... more
... Laknath Gamage, Tarek Ahmed, Hisayuki Sugimura, Srawouth Chandhaket Mutsuo Nakaoka(Prof.Dr-Eng ... invcrtcr with auxiliary passive capasitivc snubbcrs.and active rcsonant AC link load ... 15. Auxiliary rcsonant DC link soft commutation snubbcr assisted high-frcqucncy invcrtcr ...
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Abstract. SCα, CAα, QAα and QEAα stand for the classes of Pinter's substitution algebras, Tarski's cylindric algebras, Halmos' quasipolyadic algebras, and quasipolyadic equality algebras of dimension α, respectively.... more
Abstract. SCα, CAα, QAα and QEAα stand for the classes of Pinter's substitution algebras, Tarski's cylindric algebras, Halmos' quasipolyadic algebras, and quasipolyadic equality algebras of dimension α, respectively. Generalizing a result of Németi on cylindric algebras, we show that for K ...
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... In general, the single-phase sinewave inverter topologies have many practical advantages such as lower cost, smaller size, higher power density and higher efficiency power generation systems including high frequency transformer linked... more
... In general, the single-phase sinewave inverter topologies have many practical advantages such as lower cost, smaller size, higher power density and higher efficiency power generation systems including high frequency transformer linked power conditioners. ...