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Thyristor-Based Resonant Current Controlled Switched Reluctance Generator for Distributed Generation
Emadi Ali,Patel Yogesh P.,Fahimi Babak The Korean Institute of Electrical Engineers 2007 Journal of Electrical Engineering & Technology Vol.2 No.1
This paper covers switched reluctance generator (SRG) and its comparison with induction and synchronous machines for distributed generation. The SRG is simple in design, robust in construction, and fault tolerant in operation; it can also withstand very high temperatures. However, the performance and cost of the SRG power electronics driver are highly affected by the topology and design of the converter. IGBT and MOSFET based converters are not suitable for very high power applications. This paper presents thyristor-based resonant converters which are superior candidates for very high power applications. Operations of the converters are analyzed and their characteristics and dynamics are determined in terms of the system parameters. The resonant converters are capable of handling high currents and voltages; these converters are highly efficient and reliable as well. Therefore, they are suitable for high power applications in the range of 1MW or larger for distributed generation.
Status Review of Power Electronic Converters for Fuel Cell Applications
Emadi, Ali,Williamson, Sheldon S. The Korean Institute of Power Electronics 2001 JOURNAL OF POWER ELECTRONICS Vol.1 No.2
Power electronics plays an important role in providing an interface between fuel cells and loads. Furthermore, power electronic converters ensure that the power is reliably and efficiently delivered to the load in the required DC or AC form. In this paper, major types of fuel cells are presented. Basic structures, operating principles, and different applications of fuel cells are described. In addition, current status and future trends in the areas of power electronics for fuel cells are described. In addition, current statue and future trends in the areas of power electronics for fuel cell applications are explained. A review of fuel cell power electronic system topologies and basic requirements are given as well.
Status Review of Power Electronic Converters for Fuel Cell Applications
Ali Emadi,Sheldon S. Williamson 전력전자학회 2001 JOURNAL OF POWER ELECTRONICS Vol.1 No.2
Power electronics plays an important role in providing an interface between fuel cells and loads. Furthermore, power electronic converters ensure that the power is reliably and efficiently delivered to the load in the required DC or AC form. In this paper, major types of fuel cells are presented Basic structures, operating principles, and different applications of fuel cells are described In addition, current status and future trends in the areas of power electronics for fuel cell applications are explained. A review of fuel cell power electronic system topologies and basic requirements are given as well.
Thyristor-Based Resonant Current Controlled Switched Reluctance Generator for Distributed Generation
Ali Emadi,Yogesh P. Patel,Babak Fahimi 대한전기학회 2007 Journal of Electrical Engineering & Technology Vol.2 No.1
This paper covers switched reluctance generator (SRG) and its comparison with induction and synchronous machines for distributed generation. The SRG is simple in design, robust in construction, and fault tolerant in operation; it can also withstand very high temperatures. However, the performance and cost of the SRG power electronics driver are highly affected by the topology and design of the converter. IGBT and MOSFET based converters are not suitable for very high power applications. This paper presents thyristor-based resonant converters which are superior candidates for very high power applications. Operations of the converters are analyzed and their characteristics and dynamics are determined in terms of the system parameters. The resonant converters are capable of handling high currents and voltages; these converters are highly efficient and reliable as well. Therefore, they are suitable for high power applications in the range of 1㎿ or larger for distributed generation.
Synthesis and characterization of ultrafine and mesoporous structure of cobalt ferrite
Hamid Emadi,Ali Nemati Kharat 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Ultrafine nanoparticles of cobalt ferrite (CoFe2O4) were synthesized under microwave irradiation inpolyol media and then were applied for the synthesis of mesoporous structures of cobalt ferrite. Theeffect of reaction parameters on products were investigated by X-ray diffraction (XRD), scanningelectron microscopy (SEM), transmittance electron microscopy (TEM), energy dispersive X-rayspectroscopy (EDS), Fourier transform infrared (FT-IR) spectra, vibrating sample magnetometer(VSM), and volumetric nitrogen adsorption. TEM and BET analysis showed presence of mesoporusstructures with pore sizes less than 10 nm in the final product.
Oza, Ritesh,Emadi, Ali The Korean Institute of Power Electronics 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.2
Computer aided engineering (CAE) is a systematic approach to develop a better product/application with maximum possible options and minimum transition time. This paper presents a comprehensive feasibility analysis of various CAE techniques for evaluation and optimization of power electronic converters and systems. Different CAE methods for analysis, design, and performance improvement are classified. In addition, their advantages compared to the conventional workbench experimental methods are explained in detail and through examples.
Alireza Khaligh,Ali Emadi 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.1
The purpose of this paper is to address the negative impedance instability in DC/DC converters. We present the negative impedance instability of PWM DC/DC converters loaded by constant power loads (CPLs). An approach to design digital controllers for DC/DC converters is presented. The proposed method, called Power Alignment control technique, is applied to DC/DC stepdown choppers operating in continuous conduction or discontinuous conduction modes with CPLs. This approach uses two predefined state variables instead of conventional pulse width modulation (PWM) to regulate the output voltage. A comparator compares actual output voltage with the reference and then switches between the appropriate states. It needs few logic gates and comparators to be implemented, thus, making it extremely simple and easy to develop using a low-cost application specific integrated circuit (ASIC) for converters with CPLs. Furthermore, stability of the proposed controllers using the small signal analysis as well as the second theorem of Lyapunov is verified. Finally, simulation and analytical results are presented to describe and verify the proposed technique.
Ritesh Oza,Ali Emadi 전력전자학회 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.2
Computer aided engineering (CAE) is a systematic approach to develop a better product/application with maximum possible options and minimum transition time. This paper presents a comprehensive feasibility analysis of various CAE techniques for evaluation and optimization of power electronic converters and systems Different CAE methods for analysis, design, and performance improvement are classified In addition, their advantages compared to the conventional workbench experimental methods are explained m detail and through examples
Khaligh Alireza,Emadi Ali The Korean Institute of Electrical Engineers 2006 Journal of Electrical Engineering & Technology Vol.1 No.1
The purpose of this raper is to address the negative impedance instability in DC/DC converters. We present the negative impedance instability of PWM DC/DC converters loaded by constant power loads (CPLs). An approach to design digital controllers for DC/DC converters Is presented. The proposed method, called Power Alignment control technique, is applied to DC/DC step-down choppers operating in continuous conduction or discontinuous conduction modes with CPLs. This approach uses two predefined state variables instead of conventional pulse width modulation (PWM) to regulate the output voltage. A comparator compares actual output voltage with the reference and then switches between the appropriate states. It needs few logic gates and comparators to be implemented thus, making it extremely simple and easy to develop using a low-cost application specific integrated circuit (ASIC) for converters with CPLs. Furthermore, stability of the proposed controllers using the small signal analysis as well as the second theorem of Lyapunov is verified. Finally, simulation and analytical results are presented to describe and verify the proposed technique.