In this paper a precise and simple methodology will be introduced for modeling and calculating th... more In this paper a precise and simple methodology will be introduced for modeling and calculating the Voltage Source Inverter (VSI) losses in Hybrid Electric Vehicles (HEV) application. The noteworthy traction inverter losses, consisting switching and conduction losses of diodes and IGBTs, are important for evaluating the overall efficiency and obtaining the optimized value of its dc-link voltage as well. For this purpose, the effects of different battery voltage levels on the inverter losses are examined.
Switching sequences of multilevel inverters have to be properly chosen based on the desired contr... more Switching sequences of multilevel inverters have to be properly chosen based on the desired control criteria such as dc-link voltage regulation, common mode voltage reduction, and other application dependent criteria. Control of a converter to satisfy a desired criterion is challenging, especially in high voltage level converters. This paper proposes a simple control method for multilevel inverters with high modularity such as flying capacitor multilevel inverters, H-bridge multilevel inverters, and modular multilevel inverters. It is shown that the method considerably simplifies generation of the switching sequences and fulfills the desired criteria with a reasonable computational cost. The proposed method is computationally efficient in the sense that its implementation for high voltage level inverters requires the same effort as required for a multilevel inverter with a low number of cells. Other prominent advantages of the proposed control method, compared to earlier methods, include its applicability for multiphase multilevel converters and converters with asymmetrical structure and/or unevenly distributed dc voltages, independence from the level number and structure of the converter, and not requiring a lookup table. These advantages make the proposed scheme well suited for high cell-number converters, mainly utilized in FACTS, HVDC, and power quality applications. Simulation and experimental results are presented which verify the performance of the proposed method.
Abstract Carrier-based methods have been used widely for the switching of multilevel inverters du... more Abstract Carrier-based methods have been used widely for the switching of multilevel inverters due to their simplicity, flexibility and reduced computational requirements compared to Space Vector Modulation (SVM). Several multi-carrier modulation methods with miscellaneous properties have been already known. The paper proposes three novel multi-carrier techniques being more efficient for high-power inverter applications. While evaluating and comparing these new with all classical methods through measures like THD, WTHD, WTHD0, switching losses and DC bus utilization, the paper shows their advantges for applications of Diode-clamped and Cascade multi-level topologies by simulation results. The validity of obtained results is approved by experimental results.
Abstract This paper proposes a new switching implementation scheme for an Indirect Matrix Convert... more Abstract This paper proposes a new switching implementation scheme for an Indirect Matrix Converter (IMC) that can be suitably implemented using a low-cost 32-bit fixed-point DSP (TMS320F2812) operating at 150 MHz and a functional digital logic programmed in Altera (EPM7128s). The proposed method is based on carrier based PWM signals, has less computational complexity and can be implemented with very high speed and resolution. Simulation and experimental results obtained from a 5 kW converter are shown to support the given theoretical analyses and verify the full functionality of the proposed scheme.
2011 10th International Conference on Environment and Electrical Engineering, 2011
... ψ ω ω ψ = + − − (4) Hiva Nasiri Ahmad Radan Abbas Ghayebloo Kiarash Ahi ... 6 depicts it. REF... more ... ψ ω ω ψ = + − − (4) Hiva Nasiri Ahmad Radan Abbas Ghayebloo Kiarash Ahi ... 6 depicts it. REFERENCES [1] M. Ehsani, Y. Gao and A. Emadi Modern Electric, Hybrid Electric, and Fuel Cell Vehicles: Fundamentals, Theory, and Design SE, CRC Press, 2010, pp. 141-150. ...
2011 2nd Power Electronics, Drive Systems and Technologies Conference, 2011
In this paper a novel technique is proposed with which the optimal Degree of Hybridization (DOH) ... more In this paper a novel technique is proposed with which the optimal Degree of Hybridization (DOH) can be found with very little computational effort. This technique combines PSO algorithm and HEV simulation tool and its objective is to optimize both the fuel economy and vehicle performance and minimize the emissions, including HC, CO for a hybrid electric vehicle. Advanced VehIcle
2009 4th IEEE Conference on Industrial Electronics and Applications, 2009
In this paper, a new control scheme is proposed for the new single-phase single-switch three-leve... more In this paper, a new control scheme is proposed for the new single-phase single-switch three-level rectifier to supply two different load with different voltages and draw sinusoidal line current with low THD. The adopted rectifier consists of a diode bridge, a power switch and two blocking diodes. Low cost, simple structure and convenient control and three level voltage are the
ABSTRACT Having a voltage transfer ratio lower than unity with a 0.866 upper limit, even lower th... more ABSTRACT Having a voltage transfer ratio lower than unity with a 0.866 upper limit, even lower than 0.866 in the course of experiments because of parasitic components of real power circuits, is one of the shortcomings of matrix converters. This deficiency is one of the greatest impediments to industry adaptation of matrix converters. To surmount this barrier this paper proposes a novel modification in circuit topology of indirect matrix converters (IMC) achieving voltage boosting and unity voltage transfer ratio. Besides preserving the inherent advantages of the conventional matrix converters, such as controllability of input power factor, sinusoidal input/output currents and the ability of bidirectional power flow, the remarkable feature of this solution is that, unlike the other research in this field no special control strategy or additional reactive elements at the DC-link is used and the integrity of the converter has been kept as much as possible. Furthermore a new efficient switching strategy is proposed for the new converter. Simulation results are shown to support the given theoretical analyses and experimental results obtained from a 5 kW converter verify the full functionality of the proposed topology.
Proceedings of the 2011 14th European Conference on Power Electronics and Applications, Aug 1, 2011
This paper describes non-linear average model of Indirect Matrix Converter (IMC) with an output L... more This paper describes non-linear average model of Indirect Matrix Converter (IMC) with an output LC filter in stationary and rotating reference frames. The defects of pervious control strategies based on derived average model are discussed and a novel adaptive neuro-fuzzy controller is proposed. Eliminating output current sensors, good dynamic performance in any operating point without overshoot and balanced output voltages
In this paper a precise and simple methodology will be introduced for modeling and calculating th... more In this paper a precise and simple methodology will be introduced for modeling and calculating the Voltage Source Inverter (VSI) losses in Hybrid Electric Vehicles (HEV) application. The noteworthy traction inverter losses, consisting switching and conduction losses of diodes and IGBTs, are important for evaluating the overall efficiency and obtaining the optimized value of its dc-link voltage as well. For this purpose, the effects of different battery voltage levels on the inverter losses are examined.
Switching sequences of multilevel inverters have to be properly chosen based on the desired contr... more Switching sequences of multilevel inverters have to be properly chosen based on the desired control criteria such as dc-link voltage regulation, common mode voltage reduction, and other application dependent criteria. Control of a converter to satisfy a desired criterion is challenging, especially in high voltage level converters. This paper proposes a simple control method for multilevel inverters with high modularity such as flying capacitor multilevel inverters, H-bridge multilevel inverters, and modular multilevel inverters. It is shown that the method considerably simplifies generation of the switching sequences and fulfills the desired criteria with a reasonable computational cost. The proposed method is computationally efficient in the sense that its implementation for high voltage level inverters requires the same effort as required for a multilevel inverter with a low number of cells. Other prominent advantages of the proposed control method, compared to earlier methods, include its applicability for multiphase multilevel converters and converters with asymmetrical structure and/or unevenly distributed dc voltages, independence from the level number and structure of the converter, and not requiring a lookup table. These advantages make the proposed scheme well suited for high cell-number converters, mainly utilized in FACTS, HVDC, and power quality applications. Simulation and experimental results are presented which verify the performance of the proposed method.
Abstract Carrier-based methods have been used widely for the switching of multilevel inverters du... more Abstract Carrier-based methods have been used widely for the switching of multilevel inverters due to their simplicity, flexibility and reduced computational requirements compared to Space Vector Modulation (SVM). Several multi-carrier modulation methods with miscellaneous properties have been already known. The paper proposes three novel multi-carrier techniques being more efficient for high-power inverter applications. While evaluating and comparing these new with all classical methods through measures like THD, WTHD, WTHD0, switching losses and DC bus utilization, the paper shows their advantges for applications of Diode-clamped and Cascade multi-level topologies by simulation results. The validity of obtained results is approved by experimental results.
Abstract This paper proposes a new switching implementation scheme for an Indirect Matrix Convert... more Abstract This paper proposes a new switching implementation scheme for an Indirect Matrix Converter (IMC) that can be suitably implemented using a low-cost 32-bit fixed-point DSP (TMS320F2812) operating at 150 MHz and a functional digital logic programmed in Altera (EPM7128s). The proposed method is based on carrier based PWM signals, has less computational complexity and can be implemented with very high speed and resolution. Simulation and experimental results obtained from a 5 kW converter are shown to support the given theoretical analyses and verify the full functionality of the proposed scheme.
2011 10th International Conference on Environment and Electrical Engineering, 2011
... ψ ω ω ψ = + − − (4) Hiva Nasiri Ahmad Radan Abbas Ghayebloo Kiarash Ahi ... 6 depicts it. REF... more ... ψ ω ω ψ = + − − (4) Hiva Nasiri Ahmad Radan Abbas Ghayebloo Kiarash Ahi ... 6 depicts it. REFERENCES [1] M. Ehsani, Y. Gao and A. Emadi Modern Electric, Hybrid Electric, and Fuel Cell Vehicles: Fundamentals, Theory, and Design SE, CRC Press, 2010, pp. 141-150. ...
2011 2nd Power Electronics, Drive Systems and Technologies Conference, 2011
In this paper a novel technique is proposed with which the optimal Degree of Hybridization (DOH) ... more In this paper a novel technique is proposed with which the optimal Degree of Hybridization (DOH) can be found with very little computational effort. This technique combines PSO algorithm and HEV simulation tool and its objective is to optimize both the fuel economy and vehicle performance and minimize the emissions, including HC, CO for a hybrid electric vehicle. Advanced VehIcle
2009 4th IEEE Conference on Industrial Electronics and Applications, 2009
In this paper, a new control scheme is proposed for the new single-phase single-switch three-leve... more In this paper, a new control scheme is proposed for the new single-phase single-switch three-level rectifier to supply two different load with different voltages and draw sinusoidal line current with low THD. The adopted rectifier consists of a diode bridge, a power switch and two blocking diodes. Low cost, simple structure and convenient control and three level voltage are the
ABSTRACT Having a voltage transfer ratio lower than unity with a 0.866 upper limit, even lower th... more ABSTRACT Having a voltage transfer ratio lower than unity with a 0.866 upper limit, even lower than 0.866 in the course of experiments because of parasitic components of real power circuits, is one of the shortcomings of matrix converters. This deficiency is one of the greatest impediments to industry adaptation of matrix converters. To surmount this barrier this paper proposes a novel modification in circuit topology of indirect matrix converters (IMC) achieving voltage boosting and unity voltage transfer ratio. Besides preserving the inherent advantages of the conventional matrix converters, such as controllability of input power factor, sinusoidal input/output currents and the ability of bidirectional power flow, the remarkable feature of this solution is that, unlike the other research in this field no special control strategy or additional reactive elements at the DC-link is used and the integrity of the converter has been kept as much as possible. Furthermore a new efficient switching strategy is proposed for the new converter. Simulation results are shown to support the given theoretical analyses and experimental results obtained from a 5 kW converter verify the full functionality of the proposed topology.
Proceedings of the 2011 14th European Conference on Power Electronics and Applications, Aug 1, 2011
This paper describes non-linear average model of Indirect Matrix Converter (IMC) with an output L... more This paper describes non-linear average model of Indirect Matrix Converter (IMC) with an output LC filter in stationary and rotating reference frames. The defects of pervious control strategies based on derived average model are discussed and a novel adaptive neuro-fuzzy controller is proposed. Eliminating output current sensors, good dynamic performance in any operating point without overshoot and balanced output voltages
Uploads
Book by Ahmad Radan
Papers by Ahmad Radan