EPE Association: EPE 2014 - LS4a: Advanced Power Converter Topologies

EPE 2014 - LS4a: Advanced Power Converter Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 02: Power Converter Topologies and Design > EPE 2014 - LS4a: Advanced Power Converter Topologies

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   Hybrid Nearest Level and Open Loop Control of Modular Multilevel Converters
By NAVEED AHMAD KHAN, Luigi VANFRETTI, Wei LI, ARIF HAIDER [View]
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Abstract: In this paper a Nearest Level Control with open loop approach for modular multilevel converter (MMC) is proposed. By using open loop approach it is possible to suppress circulating currents without using feedback controllers. Moreover, with this method, both N+1 and 2N+1 levels (N=number of sub-modules) can be obtained at the output voltage. In addition, the voltage quality is improved and the total harmonic distortion is reduced at higher and lower modulation indices by increasing the number of levels up to 2N+1. Simulation results of 3-phase MMC are presented for both 2N+1 and N+1 levels together with the description of proposed Nearest Level Control scheme.

   Optimized control strategy enabling minimized capacitance in Modular High Frequency Converters
By Martin SCHULZ, Rainer MARQUARDT, Anna MAYER [View]
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Abstract: The Modular High Frequency converter (MHF) is a new converter topology especially designed forvehicle applications. It enables ultra-light weight and volume by drastic reduction of passive componentsand cooling equipment. This paper deals with an optimized control strategy of the MHF that leads tominimized capacitance installed in the drive system.

   Supervisory Control for Interleaved Boost Converters using HiLeS Designer
By Harold CHAMORRO, Alonso GUTIERREZ, Fernando JIMENEZ [View]
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Abstract: This paper presents the application of HiLeS (High Level Specification of Embedded Systems) formalism to design a supervisory controller based on FPGA for interleaved boost converters. This controller is intended to increase the versatility and efficiency of interleaved boost converters. Furthermore, the proposed supervisory controller uses Petri nets for structural analysis and stability. HiLeS-Designer tool, which is a platform based on HiLeS formalism, is used to design and implement the supervisory controller in embedded hardware. This approach uses the digital component of VHDL-AMS code generated by the HiLeS-Designer tool to implement the supervisory controller in FPGA. Simulations and experimental results show that the pro-posed control strategy increases the operating range and efficien-cy of interleaved boost converters.

   The Augmented Modular Multilevel Converter
By Colin OATES, Kevin DYKE, David TRAINER [View]
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Abstract: The Controlled Transition Bridge (CTB) is a class of converter topology that combines series connected semiconductor director valves with chains of switched capacitor modules, chainlink circuits, in such a way that the director valves carry the main current for a significant portion of the period and the chainlink circuits provide a controlled traverse of voltage between different director valves conducting. This combination is applicable to HVDC where efficiency is paramount, since it allows thyristors or diodes to be used for the director valves to reduce the conduction losses, with the chainlink circuits providing commutation and direct control of the rate of change of transition voltage. Since the chainlink portion of the AMMC only has to manage the transition between the upper and lower director valves, the size of the capacitors in the individual sub-modules can be reduced, reducing the converter footprint. Also the trapezoidal waveform that results can be tailored to give reduced harmonic levels, so reducing filtering required for the AC waveform to meet regulations on distortion at the point of common coupling for the converter (PCC).An analysis is presented of an example of this type of converter where a modular multilevel converter (MMC) is combined with a conventional thyristor bridge, the Augmented MMC (AMMC). Various aspects of the operation of the bridge are discussed, including the management of the charge in the chainlink capacitors and the converter losses.

EPE 2014 - LS4a: Advanced Power Converter Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 02: Power Converter Topologies and Design > EPE 2014 - LS4a: Advanced Power Converter Topologies
	[return to parent folder]

	Hybrid Nearest Level and Open Loop Control of Modular Multilevel Converters By NAVEED AHMAD KHAN, Luigi VANFRETTI, Wei LI, ARIF HAIDER	[View] [Download]
Abstract: In this paper a Nearest Level Control with open loop approach for modular multilevel converter (MMC) is proposed. By using open loop approach it is possible to suppress circulating currents without using feedback controllers. Moreover, with this method, both N+1 and 2N+1 levels (N=number of sub-modules) can be obtained at the output voltage. In addition, the voltage quality is improved and the total harmonic distortion is reduced at higher and lower modulation indices by increasing the number of levels up to 2N+1. Simulation results of 3-phase MMC are presented for both 2N+1 and N+1 levels together with the description of proposed Nearest Level Control scheme.

	Optimized control strategy enabling minimized capacitance in Modular High Frequency Converters By Martin SCHULZ, Rainer MARQUARDT, Anna MAYER	[View] [Download]
Abstract: The Modular High Frequency converter (MHF) is a new converter topology especially designed forvehicle applications. It enables ultra-light weight and volume by drastic reduction of passive componentsand cooling equipment. This paper deals with an optimized control strategy of the MHF that leads tominimized capacitance installed in the drive system.

	Supervisory Control for Interleaved Boost Converters using HiLeS Designer By Harold CHAMORRO, Alonso GUTIERREZ, Fernando JIMENEZ	[View] [Download]
Abstract: This paper presents the application of HiLeS (High Level Specification of Embedded Systems) formalism to design a supervisory controller based on FPGA for interleaved boost converters. This controller is intended to increase the versatility and efficiency of interleaved boost converters. Furthermore, the proposed supervisory controller uses Petri nets for structural analysis and stability. HiLeS-Designer tool, which is a platform based on HiLeS formalism, is used to design and implement the supervisory controller in embedded hardware. This approach uses the digital component of VHDL-AMS code generated by the HiLeS-Designer tool to implement the supervisory controller in FPGA. Simulations and experimental results show that the pro-posed control strategy increases the operating range and efficien-cy of interleaved boost converters.

	The Augmented Modular Multilevel Converter By Colin OATES, Kevin DYKE, David TRAINER	[View] [Download]
Abstract: The Controlled Transition Bridge (CTB) is a class of converter topology that combines series connected semiconductor director valves with chains of switched capacitor modules, chainlink circuits, in such a way that the director valves carry the main current for a significant portion of the period and the chainlink circuits provide a controlled traverse of voltage between different director valves conducting. This combination is applicable to HVDC where efficiency is paramount, since it allows thyristors or diodes to be used for the director valves to reduce the conduction losses, with the chainlink circuits providing commutation and direct control of the rate of change of transition voltage. Since the chainlink portion of the AMMC only has to manage the transition between the upper and lower director valves, the size of the capacitors in the individual sub-modules can be reduced, reducing the converter footprint. Also the trapezoidal waveform that results can be tailored to give reduced harmonic levels, so reducing filtering required for the AC waveform to meet regulations on distortion at the point of common coupling for the converter (PCC).An analysis is presented of an example of this type of converter where a modular multilevel converter (MMC) is combined with a conventional thyristor bridge, the Augmented MMC (AMMC). Various aspects of the operation of the bridge are discussed, including the management of the charge in the chainlink capacitors and the converter losses.