EPE Association: EPE 2014 - LS5e: Industry Specific Energy Conversion and Conditionning Technologies

EPE 2014 - LS5e: Industry Specific Energy Conversion and Conditionning Technologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 09: Industry-Specific Energy Conversion and Conditioning Technologies > EPE 2014 - LS5e: Industry Specific Energy Conversion and Conditionning Technologies

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   Design of a Modular Multilevel Converter as an Active Front-End for a magnet supply application
By Panagiotis ASIMAKOPOULOS, Konstantinos PAPASTERGIOU, Massimo BONGIORNO [View]
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Abstract: The aim of this work is to describe the general design procedure of a Modular Multilevel Converter (MMC) applied as an Active Front-End (AFE) for a magnet supply for beam accelerators. The dimensioning criteria for the converter and the dc-link capacitance are presented and the grid transformer requirements are set. Considering the converter design, the arm inductance calculation is based on the specifications for the arm-current ripple and the DC-link fault tolerance, but, also, on the limitation of the second harmonic and the second-order LC resonance of the arm current. The module capacitance value is evaluated by focusing on the required switching dynamics and the capacitor-voltage ripple according to a newly proposed graphical method. The loading of each semiconductor in the half bridge is calculated via simulation, indicating the unsymmetrical current distribution. It is concluded that the current distribution for each semiconductor depends on the mode of operation of the converter. The different criteria for the choice of the number of modules per arm are discussed. Finally, the complete system, including a model for the load and the converter control strategy applied to the converter is simulated and obtained results are presented.

   IMPLEMENTATION OF AN ACTIVE REGENERATION UNIT IN A TRACTION SUBSTATION
By Will DE JAGER, Marnix HUIZER, Ernst VAN DER POLS [View]
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Abstract: This paper describes the practical implementation of an Active Regeneration Unit (ARU) at twolocations of the metro network in Rotterdam. Surplus braking energy that cannot be used by othervehicles is supplied back into the public grid. Optimal locations for the regeneration units aredetermined by simulations based on the complete infrastructure, the vehicles characteristics and theoperational timetable. The amount of regenerated energy is very dependent on the location. Locationswith an average density of traffic seem to offer the most potential for energy regeneration. Thesimulations show that up to 19\% of the energy normally used over a daily timetable can beregenerated. With increased converter power values of up to 23\% can be achieved.The regeneration range is limited to a voltage range between the zero-load voltage of the transformer-rectifier and the regeneration voltage limit. Regeneration is further limited by the voltage drop over thecontact line and the return path. Therefore, an increase of the regeneration limit is proposed.Several further implementation issues are discussed. These include: the space required for the ARU;the electrical connection to the rectifier; and the protection philosophy to protect the ARU fromexternal disturbances whilst ensuring the maximum availability of the infrastructure. As the ARU willbe connected to the existing installation in the substation, it is important to verify the influence fromARU generated transients and harmonics on the existing installation in a simulation of the completesystem.

   Small Scaled Power Hardware-In-the Loop and Control Method of Ship Integrated Power System with Active Frond End Converter and Battery Energy Storage System usi
By Sehwa CHOE, Sanggi KO, So Yeon KIM, Seung-Ki SUL [View]
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Abstract: This paper proposes a control method of the whole ship Integrated Power System (IPS) with an Active Front End (AFE) converter and a Battery Energy Storage System (BESS). The propulsion inverter which drives the propulsion motor controls the ship speed by controlling the torque of the motor. The AFE converter controls not only the active and reactive power flow at the Point of Common Coupling (PCC) to suppress the transients of the both frequency and voltage of the PCC simultaneously, but also the State Of Charge (SOC) of the BESS. The components of the ship IPS are modeled partially by software or implemented partially as hardware for the real time Power Hardware-In-the Loop Simulation (PHILS) to verify the proposed algorithm. The parallel operating generators and their associate controllers, ship-service load, and pulse load are modeled in C code, after partitioned to distributed computational burden, and simulated in low cost multicore DSP. The hardware is down scaled because of the cost, time, space and safety issues while preserving the electrical and mechanical dynamics. The connection between HILS and hardware is achieved via a custom designed voltage amplifier. The dynamics and load sharing properties of the parallel operating generators, the proposed propulsion inverter controller, and the AFE converter controller have been verified successfully.

   Three-level Non-regenerative Rectifiers with Reduced Number of Devices for Aerospace Applications
By XIBO YUAN [View]
[Download]

Abstract: This paper has summarized and compared various topologies of three-level non-regenerative rectifiers for aerospace applications. The converter maximum power capacity and current ripple with relation to the input inductance and dc-link voltage has been analytically derived. A modulation method is proposed to dynamically constrain the reference voltage during fast transient response and in case of high current ripple conditions, thus to guarantee successful control of the rectifier. Simulation results have validated the proposed control method.

EPE 2014 - LS5e: Industry Specific Energy Conversion and Conditionning Technologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 09: Industry-Specific Energy Conversion and Conditioning Technologies > EPE 2014 - LS5e: Industry Specific Energy Conversion and Conditionning Technologies
	[return to parent folder]

	Design of a Modular Multilevel Converter as an Active Front-End for a magnet supply application By Panagiotis ASIMAKOPOULOS, Konstantinos PAPASTERGIOU, Massimo BONGIORNO	[View] [Download]
Abstract: The aim of this work is to describe the general design procedure of a Modular Multilevel Converter (MMC) applied as an Active Front-End (AFE) for a magnet supply for beam accelerators. The dimensioning criteria for the converter and the dc-link capacitance are presented and the grid transformer requirements are set. Considering the converter design, the arm inductance calculation is based on the specifications for the arm-current ripple and the DC-link fault tolerance, but, also, on the limitation of the second harmonic and the second-order LC resonance of the arm current. The module capacitance value is evaluated by focusing on the required switching dynamics and the capacitor-voltage ripple according to a newly proposed graphical method. The loading of each semiconductor in the half bridge is calculated via simulation, indicating the unsymmetrical current distribution. It is concluded that the current distribution for each semiconductor depends on the mode of operation of the converter. The different criteria for the choice of the number of modules per arm are discussed. Finally, the complete system, including a model for the load and the converter control strategy applied to the converter is simulated and obtained results are presented.

	IMPLEMENTATION OF AN ACTIVE REGENERATION UNIT IN A TRACTION SUBSTATION By Will DE JAGER, Marnix HUIZER, Ernst VAN DER POLS	[View] [Download]
Abstract: This paper describes the practical implementation of an Active Regeneration Unit (ARU) at twolocations of the metro network in Rotterdam. Surplus braking energy that cannot be used by othervehicles is supplied back into the public grid. Optimal locations for the regeneration units aredetermined by simulations based on the complete infrastructure, the vehicles characteristics and theoperational timetable. The amount of regenerated energy is very dependent on the location. Locationswith an average density of traffic seem to offer the most potential for energy regeneration. Thesimulations show that up to 19\% of the energy normally used over a daily timetable can beregenerated. With increased converter power values of up to 23\% can be achieved.The regeneration range is limited to a voltage range between the zero-load voltage of the transformer-rectifier and the regeneration voltage limit. Regeneration is further limited by the voltage drop over thecontact line and the return path. Therefore, an increase of the regeneration limit is proposed.Several further implementation issues are discussed. These include: the space required for the ARU;the electrical connection to the rectifier; and the protection philosophy to protect the ARU fromexternal disturbances whilst ensuring the maximum availability of the infrastructure. As the ARU willbe connected to the existing installation in the substation, it is important to verify the influence fromARU generated transients and harmonics on the existing installation in a simulation of the completesystem.

	Small Scaled Power Hardware-In-the Loop and Control Method of Ship Integrated Power System with Active Frond End Converter and Battery Energy Storage System usi By Sehwa CHOE, Sanggi KO, So Yeon KIM, Seung-Ki SUL	[View] [Download]
Abstract: This paper proposes a control method of the whole ship Integrated Power System (IPS) with an Active Front End (AFE) converter and a Battery Energy Storage System (BESS). The propulsion inverter which drives the propulsion motor controls the ship speed by controlling the torque of the motor. The AFE converter controls not only the active and reactive power flow at the Point of Common Coupling (PCC) to suppress the transients of the both frequency and voltage of the PCC simultaneously, but also the State Of Charge (SOC) of the BESS. The components of the ship IPS are modeled partially by software or implemented partially as hardware for the real time Power Hardware-In-the Loop Simulation (PHILS) to verify the proposed algorithm. The parallel operating generators and their associate controllers, ship-service load, and pulse load are modeled in C code, after partitioned to distributed computational burden, and simulated in low cost multicore DSP. The hardware is down scaled because of the cost, time, space and safety issues while preserving the electrical and mechanical dynamics. The connection between HILS and hardware is achieved via a custom designed voltage amplifier. The dynamics and load sharing properties of the parallel operating generators, the proposed propulsion inverter controller, and the AFE converter controller have been verified successfully.

	Three-level Non-regenerative Rectifiers with Reduced Number of Devices for Aerospace Applications By XIBO YUAN	[View] [Download]
Abstract: This paper has summarized and compared various topologies of three-level non-regenerative rectifiers for aerospace applications. The converter maximum power capacity and current ripple with relation to the input inductance and dc-link voltage has been analytically derived. A modulation method is proposed to dynamically constrain the reference voltage during fast transient response and in case of high current ripple conditions, thus to guarantee successful control of the rectifier. Simulation results have validated the proposed control method.