EPE Association: EPE 2007 - Subtopic 16-6 - DS: Electrical systems in aerospace, space, surface and marine transport

EPE 2007 - Subtopic 16-6 - DS: Electrical systems in aerospace, space, surface and marine transport
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 16: 'Electrical systems in aerospace, space, surface and marine transport' > EPE 2007 - Subtopic 16-6 - DS: Electrical systems in aerospace, space, surface and marine transport

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   A less sensor control method of PMSM using a hall sensor
By AKATSU Kan [View]
[Download]

Abstract: A less sensor control using a hall sensor is proposed to solve the problems of the sensorless control, the parameter variation and saliency effect and an effect of the high frequency injection. A rotational speed is estimated by a speed observer without using machine parameters, and the position is corrected by an output signal from a hall sensor.

   A Simple Starting Method for Self-Controlled Synchronous Motors in Electric Propulsion Systems for Ships
By HASEGAWA Chihiro; NISHIKATA Shoji [View]
[Download]

Abstract: A new method for starting a self-controlled synchronous motor used for propelling a ship is proposed. First, a simple detecting method without any sensor for the initial rotor position is revealed. The initial rotor position can be detected easily by observing the electromotive forces induced in the armature windings due to the change in the field current when the rotor is at a standstill. According to this method, initial rotor position can be detected every 30Â° of the rotor position. The starting method, in which the initial rotor position detecting method is incorporated, for the self-controlled synchronous motor is then given. The proposed starting method is based on the DC link current chopping with controlling the DC source voltage during starting period. It is shown that the motor can be started up without reverse rotation, supporting the usefulness of the proposed method. Finally, the speed control systems for the self-controlled synchronous motor after starting period are discussed. It is shown that the basic speed control system with a speed feedback loop is apt to become unstable. It is also clarified that the system with two feedback loops, a speed feedback loop and a current feedback loop, is very effective for the system stabilization after starting.

   A Software Simulation Program for a Hybrid Fuel Cell - Battery Power Supply for an Electric Forklift
By CHAN Edward; DAWSON Francis; LIVSHITS Eugene; BEKKER Henk [View]
[Download]

Abstract: This paper presents the development of a software simulation program for an electric forklift powered by a hybrid fuel cell - battery power supply. The power supply is based on a range extender active hybrid configuration, where a proton exchange membrane (PEM) fuel cell is used to continuously charge a flooded lead-acid battery on-board the forklift. The program involved modelling the discharging and charging characteristics of a flooded lead-acid battery along with the fuel consumption of the PEM fuel cell and the power consumed by the fuel cell's balance of plant components.

   BI-DIRECTIONAL DC- DC CONVERTERS FOR SUPERCAPACITOR BASED ENERGY BUFFER FOR ELECTRICAL GEN-SETS
By RERUCHA Vladimir; LEUCHTER Jan; BAUER Pavol [View]
[Download]

Abstract: The real drawback of the concept of electrical generator sets (EGS) with variable speed is the enginegenerator dynamics at sudden load change from low to high. The analysis of dynamic behavior presented in this paper proves that the disadvantageous dynamical properties of EGS concepts with variable speed of engine can be improved by using an energy storage element. This paper give results of design of the bi-directional dc-dc converters for energy buffer with supercapacitors and also demonstrates the results of dynamic behavior EGS with energy buffer.

   ELECTRIC BICYCLE USING BATTERIES AND SUPERCAPACITORS
By SOUSA Duarte; BRANCO Paulo; DENTE Joaquim [View]
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Abstract: In this paper, a traction system useful for an autonomous Electric Vehicle of individual use is described. The developed system is constituted in a first approach by two different power sources: one is constituted by batteries or by fuel cells, and the other by supercapacitors. This paper describes a technical solution joining and accomplishing the usage of two energy storage systems in the same traction system. In the developed system, the supercapacitors run as element that store energy temporarily and that can be used to retrieve energy. Starting from the functional characteristics of typical electrical vehicles and characterization of a typical routing profile, the energy consumption is obtained. In order to characterize and design the system, this is described in detail, namely the supercapacitors models, the battery, the power converters and the implemented strategy of control. According to the obtained results, a control strategy that allows an effective management of the stored energy in the system regarding the vehicle's optimal functioning and increasing its autonomy is also presented and discussed. Based on experimental and simulation results, the advantages and disadvantages of the proposed solution are presented.

   High efficiency LEVs
By RIVA Marco; MAURI Marco; BIANCHI Roberto; PICCIOTTI Gianmario; CASTELLI DEZZA Francesco [View]
[Download]

Abstract: The increase exigency of mobility, and consequent the fall down effect on the global pollution due to the use of chemical propellant propulsion has rise the attention of the international community on the pollution free alternative. The paper addresses the main components of modern electric vehicles and the design of a Light Electric Vehicle (LEV) for middle range use. Industrial considerations about the exigency of dedicated infrastructure for introducing electric vehicles in large scales are reported with reference to the MES-DEA experience. A detailed description of the main characteristic of the fuel cell suited for LEV application are given. Experimental results of a full test of compliance for a PEM fuel cell optimized for LEV application are reported .

   State space average modelling of 6- and 12-pulse diode rectifiers
By WANG Jiabin [View]
[Download]

Abstract: This paper derives the averaged-value models for 6- and 12- pulse transformer-diode rectifier units and validates their utilities by comparison of the resultant transient and steady state behaviors with those obtained from extensive simulations of detailed 6- and 12-pulse diode rectifier models. It is shown that the averaged-value models capture the key features of the dynamic characteristics of the rectifiers, while being time invariant and computationally efficient. The developed models can, therefore, be used for stability assessment of electric power systems which employ the diode rectifiers, multiple power electronic converter-controlled loads and electrical drives.

EPE 2007 - Subtopic 16-6 - DS: Electrical systems in aerospace, space, surface and marine transport
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 16: 'Electrical systems in aerospace, space, surface and marine transport' > EPE 2007 - Subtopic 16-6 - DS: Electrical systems in aerospace, space, surface and marine transport
	[return to parent folder]

	A less sensor control method of PMSM using a hall sensor By AKATSU Kan	[View] [Download]
Abstract: A less sensor control using a hall sensor is proposed to solve the problems of the sensorless control, the parameter variation and saliency effect and an effect of the high frequency injection. A rotational speed is estimated by a speed observer without using machine parameters, and the position is corrected by an output signal from a hall sensor.

	A Simple Starting Method for Self-Controlled Synchronous Motors in Electric Propulsion Systems for Ships By HASEGAWA Chihiro; NISHIKATA Shoji	[View] [Download]
Abstract: A new method for starting a self-controlled synchronous motor used for propelling a ship is proposed. First, a simple detecting method without any sensor for the initial rotor position is revealed. The initial rotor position can be detected easily by observing the electromotive forces induced in the armature windings due to the change in the field current when the rotor is at a standstill. According to this method, initial rotor position can be detected every 30Â° of the rotor position. The starting method, in which the initial rotor position detecting method is incorporated, for the self-controlled synchronous motor is then given. The proposed starting method is based on the DC link current chopping with controlling the DC source voltage during starting period. It is shown that the motor can be started up without reverse rotation, supporting the usefulness of the proposed method. Finally, the speed control systems for the self-controlled synchronous motor after starting period are discussed. It is shown that the basic speed control system with a speed feedback loop is apt to become unstable. It is also clarified that the system with two feedback loops, a speed feedback loop and a current feedback loop, is very effective for the system stabilization after starting.

	A Software Simulation Program for a Hybrid Fuel Cell - Battery Power Supply for an Electric Forklift By CHAN Edward; DAWSON Francis; LIVSHITS Eugene; BEKKER Henk	[View] [Download]
Abstract: This paper presents the development of a software simulation program for an electric forklift powered by a hybrid fuel cell - battery power supply. The power supply is based on a range extender active hybrid configuration, where a proton exchange membrane (PEM) fuel cell is used to continuously charge a flooded lead-acid battery on-board the forklift. The program involved modelling the discharging and charging characteristics of a flooded lead-acid battery along with the fuel consumption of the PEM fuel cell and the power consumed by the fuel cell's balance of plant components.

	BI-DIRECTIONAL DC- DC CONVERTERS FOR SUPERCAPACITOR BASED ENERGY BUFFER FOR ELECTRICAL GEN-SETS By RERUCHA Vladimir; LEUCHTER Jan; BAUER Pavol	[View] [Download]
Abstract: The real drawback of the concept of electrical generator sets (EGS) with variable speed is the enginegenerator dynamics at sudden load change from low to high. The analysis of dynamic behavior presented in this paper proves that the disadvantageous dynamical properties of EGS concepts with variable speed of engine can be improved by using an energy storage element. This paper give results of design of the bi-directional dc-dc converters for energy buffer with supercapacitors and also demonstrates the results of dynamic behavior EGS with energy buffer.

	ELECTRIC BICYCLE USING BATTERIES AND SUPERCAPACITORS By SOUSA Duarte; BRANCO Paulo; DENTE Joaquim	[View] [Download]
Abstract: In this paper, a traction system useful for an autonomous Electric Vehicle of individual use is described. The developed system is constituted in a first approach by two different power sources: one is constituted by batteries or by fuel cells, and the other by supercapacitors. This paper describes a technical solution joining and accomplishing the usage of two energy storage systems in the same traction system. In the developed system, the supercapacitors run as element that store energy temporarily and that can be used to retrieve energy. Starting from the functional characteristics of typical electrical vehicles and characterization of a typical routing profile, the energy consumption is obtained. In order to characterize and design the system, this is described in detail, namely the supercapacitors models, the battery, the power converters and the implemented strategy of control. According to the obtained results, a control strategy that allows an effective management of the stored energy in the system regarding the vehicle's optimal functioning and increasing its autonomy is also presented and discussed. Based on experimental and simulation results, the advantages and disadvantages of the proposed solution are presented.

	High efficiency LEVs By RIVA Marco; MAURI Marco; BIANCHI Roberto; PICCIOTTI Gianmario; CASTELLI DEZZA Francesco	[View] [Download]
Abstract: The increase exigency of mobility, and consequent the fall down effect on the global pollution due to the use of chemical propellant propulsion has rise the attention of the international community on the pollution free alternative. The paper addresses the main components of modern electric vehicles and the design of a Light Electric Vehicle (LEV) for middle range use. Industrial considerations about the exigency of dedicated infrastructure for introducing electric vehicles in large scales are reported with reference to the MES-DEA experience. A detailed description of the main characteristic of the fuel cell suited for LEV application are given. Experimental results of a full test of compliance for a PEM fuel cell optimized for LEV application are reported .

	State space average modelling of 6- and 12-pulse diode rectifiers By WANG Jiabin	[View] [Download]
Abstract: This paper derives the averaged-value models for 6- and 12- pulse transformer-diode rectifier units and validates their utilities by comparison of the resultant transient and steady state behaviors with those obtained from extensive simulations of detailed 6- and 12-pulse diode rectifier models. It is shown that the averaged-value models capture the key features of the dynamic characteristics of the rectifiers, while being time invariant and computationally efficient. The developed models can, therefore, be used for stability assessment of electric power systems which employ the diode rectifiers, multiple power electronic converter-controlled loads and electrical drives.