EPE Association: EPE 2007 - Subtopic 05-7 - DS: Emerging and fault tolerant topologies

EPE 2007 - Subtopic 05-7 - DS: Emerging and fault tolerant topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 05: 'Hard switching converters and control' > EPE 2007 - Subtopic 05-7 - DS: Emerging and fault tolerant topologies

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   A New Topology for PV DC/DC Converter with High Efficiency Under Wide Load Range
By MIN Byungduk; KIM Taejin; YOO Dongwook; LEE Jongpil; YOO Jiyoon [View]
[Download]

Abstract: The paper proposes a new topology for photovoltaic dc/dc converter with high efficiency under wide input voltage range is proposed. Photovoltaic dc/dc is a very crucial part of power conditioning system(PCS). Considering that output characteristic of photovoltaic cell has wide voltage range, depending on the operating conditions of photovoltaic cell, the dc/dc converter also needs to have wide input voltage range to regulate the constant output voltage. In addition, a high rated voltage of power switch(MOSFET) for dc/dc converter is necessary in order to be compatible with the high maximum output voltage of photovoltaic cell's maximum output voltage. Also photovoltaic power conditioning system should have a high efficiency under operation condition. To satisfy PV PCS condition series connected non-isolated dc/dc converter topology is proposed. This paper examines the proposed topology employing four modules and shows that it dramatically enhances the energy efficiency from low load to high load condition by reducing the required power level for dc/dc converter by one-third of conventional dc/dc converter. A case of 20kW prototype as the PV dc/dc converter is introduced to experimentally verify the proposed topology.

   A Novel Nine-Switch PWM Rectifier-Inverter Topology for Three-Phase UPS Applications
By LIU Congwei; XU Dewei; WU Bin; ZARAGARI Navid [View]
[Download]

Abstract: A novel three-phase PWM rectifier-inverter topology for UPS applications is proposed in this paper. The topology uses only nine IGBT devices for AC/AC conversion through a quasi dc link circuit. This converter topology features sinusoidal inputs and outputs, unity input power factor, and more importantly, low manufacturing cost. The operating principle of the converter is elaborated and a novel modulation scheme is presented. The performance of the proposed converter is verified by experiments on a 5kVA prototyping UPS system.

   Diode-Assisted Buck-Boost Voltage Source Inverters
By GAO Feng; BLAABJERG Frede; LOH Poh Chiang; TEODORESCU Remus [View]
[Download]

Abstract: This paper proposes buck-boost voltage source inverters with a unique X-shape diode-capacitor network inserted between inverter circuitry and dc source for producing a large voltage boost gain. Comparing with other voltage buck-boost techniques, the presented topologies with only a little more passive components can significantly enhance voltage boost capability for dc-ac inversion. With different front-end circuitries, the diode-assisted buck-boost inverters can show different operational principle and voltage boost ratio. Carefully analyzing the operational principle for the inherent energy charging and discharging processes of passive components reveals that the dc-link voltage can alternate between two levels, which therefore demonstrate the phenomena that the specified modulation schemes should note. A modulation scheme that can achieve optimized harmonic switching is first designed with symmetrical state placement in each switching sequence to avoid unnecessary voltage stress across both passive and active components. To reduce the total commutation count, the designed modulation scheme is then modified without increasing voltage stress. All theoretical findings were verified experimentally using a number of scale-down laboratory prototypes.

   Fault-Tolerant Inverter for on-board aircraft EHA.
By MAVIER JÃ©rÃ´me; PIQUET Hubert; RICHARDEAU FrÃ©dÃ©ric; GATEAU Guillaume [View]
[Download]

Abstract: In more-electrical aircraft, most of the flight surfaces are equipped with electro-hydrostatic actuators. A high reliability is mandatory, combined to fault-handling strategies for the VS inverter, which is a part of crucial importance of this equipment, controlling the power flows and the performances. The proposed topology uses a safe fourth-leg connected to the star tap of a standard PMSM winding. Fault-handling IGBT drivers and isolating AC switches are introduced in series with all the legs so as to confine a local inverter fault and to manage the post-fault operation. A modular and versatile design is proposed, based on a generic set of two legs including a local over-current / temperature monitoring and an optional self isolation capability under fault. In this paper, the authors present a complete lab test-bench, the DSP-FPGA digital control including a state chart and finally results in post-fault two-phase reconfiguration.

   Harmonic Draining Transformer-Coupled Boost-Type Rectifier Systems with Sinusoidal Input Currents
By HOSHI Nobukazu; OGUCHI Kuniomi; KUBOTA Tomotsugu; NAMATAME Takahiro [View]
[Download]

Abstract: Novel double- and triple-rectifier systems coupled with a harmonic draining transformer and a harmonic blocking transformer are proposed. Both the systems can produce sinusoidal line currents when the dc output currents of the diode bridges are controlled in a quasi-triangular- or quasi-trapezoidal-shape, respectively. In comparison with a conventional PWM converter, the proposed systems have the advantages of lower switching-frequencies and smaller switching-currents.

   Inverter topology comparison for remedial solution in transistor faulty case
By LANFRANCHI Vincent; FRIEDRICH Guy; DOC Caroline [View]
[Download]

Abstract: Electric actuators are more and more used for application requiring high reliability. A study of different inverter topologies to increase reliability and avoid an expensive redundancy is presented. To illustrate our words, remedial operations are applied to the case of short-circuited transistor of the inverter.

   The bidirectional Z-source inverter for energy storage application
By RABKOWSKI Jacek [View]
[Download]

Abstract: Paper describes development of a three-phase bidirectional Z-source inverter (ZSI) interfacing an energy storage and supply network. Idea of bidirectional operation of ZSI is presented and simply solution of the capacitor voltage overboost problem is proposed. Issue of correct selection of voltage levels and minimum storage voltage for grid-connected inverter is discussed. Selection of the suitable PWM method and design process with special attention on Z-network passive elements is done in reference to comparable system of VSI supported by DC/DC converter. Finally, considerations are illustrated by laboratory test results of grid-connected three phase bidirectional Z-source inverter.

EPE 2007 - Subtopic 05-7 - DS: Emerging and fault tolerant topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 05: 'Hard switching converters and control' > EPE 2007 - Subtopic 05-7 - DS: Emerging and fault tolerant topologies
	[return to parent folder]

	A New Topology for PV DC/DC Converter with High Efficiency Under Wide Load Range By MIN Byungduk; KIM Taejin; YOO Dongwook; LEE Jongpil; YOO Jiyoon	[View] [Download]
Abstract: The paper proposes a new topology for photovoltaic dc/dc converter with high efficiency under wide input voltage range is proposed. Photovoltaic dc/dc is a very crucial part of power conditioning system(PCS). Considering that output characteristic of photovoltaic cell has wide voltage range, depending on the operating conditions of photovoltaic cell, the dc/dc converter also needs to have wide input voltage range to regulate the constant output voltage. In addition, a high rated voltage of power switch(MOSFET) for dc/dc converter is necessary in order to be compatible with the high maximum output voltage of photovoltaic cell's maximum output voltage. Also photovoltaic power conditioning system should have a high efficiency under operation condition. To satisfy PV PCS condition series connected non-isolated dc/dc converter topology is proposed. This paper examines the proposed topology employing four modules and shows that it dramatically enhances the energy efficiency from low load to high load condition by reducing the required power level for dc/dc converter by one-third of conventional dc/dc converter. A case of 20kW prototype as the PV dc/dc converter is introduced to experimentally verify the proposed topology.

	A Novel Nine-Switch PWM Rectifier-Inverter Topology for Three-Phase UPS Applications By LIU Congwei; XU Dewei; WU Bin; ZARAGARI Navid	[View] [Download]
Abstract: A novel three-phase PWM rectifier-inverter topology for UPS applications is proposed in this paper. The topology uses only nine IGBT devices for AC/AC conversion through a quasi dc link circuit. This converter topology features sinusoidal inputs and outputs, unity input power factor, and more importantly, low manufacturing cost. The operating principle of the converter is elaborated and a novel modulation scheme is presented. The performance of the proposed converter is verified by experiments on a 5kVA prototyping UPS system.

	Diode-Assisted Buck-Boost Voltage Source Inverters By GAO Feng; BLAABJERG Frede; LOH Poh Chiang; TEODORESCU Remus	[View] [Download]
Abstract: This paper proposes buck-boost voltage source inverters with a unique X-shape diode-capacitor network inserted between inverter circuitry and dc source for producing a large voltage boost gain. Comparing with other voltage buck-boost techniques, the presented topologies with only a little more passive components can significantly enhance voltage boost capability for dc-ac inversion. With different front-end circuitries, the diode-assisted buck-boost inverters can show different operational principle and voltage boost ratio. Carefully analyzing the operational principle for the inherent energy charging and discharging processes of passive components reveals that the dc-link voltage can alternate between two levels, which therefore demonstrate the phenomena that the specified modulation schemes should note. A modulation scheme that can achieve optimized harmonic switching is first designed with symmetrical state placement in each switching sequence to avoid unnecessary voltage stress across both passive and active components. To reduce the total commutation count, the designed modulation scheme is then modified without increasing voltage stress. All theoretical findings were verified experimentally using a number of scale-down laboratory prototypes.

	Fault-Tolerant Inverter for on-board aircraft EHA. By MAVIER JÃ©rÃ´me; PIQUET Hubert; RICHARDEAU FrÃ©dÃ©ric; GATEAU Guillaume	[View] [Download]
Abstract: In more-electrical aircraft, most of the flight surfaces are equipped with electro-hydrostatic actuators. A high reliability is mandatory, combined to fault-handling strategies for the VS inverter, which is a part of crucial importance of this equipment, controlling the power flows and the performances. The proposed topology uses a safe fourth-leg connected to the star tap of a standard PMSM winding. Fault-handling IGBT drivers and isolating AC switches are introduced in series with all the legs so as to confine a local inverter fault and to manage the post-fault operation. A modular and versatile design is proposed, based on a generic set of two legs including a local over-current / temperature monitoring and an optional self isolation capability under fault. In this paper, the authors present a complete lab test-bench, the DSP-FPGA digital control including a state chart and finally results in post-fault two-phase reconfiguration.

	Harmonic Draining Transformer-Coupled Boost-Type Rectifier Systems with Sinusoidal Input Currents By HOSHI Nobukazu; OGUCHI Kuniomi; KUBOTA Tomotsugu; NAMATAME Takahiro	[View] [Download]
Abstract: Novel double- and triple-rectifier systems coupled with a harmonic draining transformer and a harmonic blocking transformer are proposed. Both the systems can produce sinusoidal line currents when the dc output currents of the diode bridges are controlled in a quasi-triangular- or quasi-trapezoidal-shape, respectively. In comparison with a conventional PWM converter, the proposed systems have the advantages of lower switching-frequencies and smaller switching-currents.

	Inverter topology comparison for remedial solution in transistor faulty case By LANFRANCHI Vincent; FRIEDRICH Guy; DOC Caroline	[View] [Download]
Abstract: Electric actuators are more and more used for application requiring high reliability. A study of different inverter topologies to increase reliability and avoid an expensive redundancy is presented. To illustrate our words, remedial operations are applied to the case of short-circuited transistor of the inverter.

	The bidirectional Z-source inverter for energy storage application By RABKOWSKI Jacek	[View] [Download]
Abstract: Paper describes development of a three-phase bidirectional Z-source inverter (ZSI) interfacing an energy storage and supply network. Idea of bidirectional operation of ZSI is presented and simply solution of the capacitor voltage overboost problem is proposed. Issue of correct selection of voltage levels and minimum storage voltage for grid-connected inverter is discussed. Selection of the suitable PWM method and design process with special attention on Z-network passive elements is done in reference to comparable system of VSI supported by DC/DC converter. Finally, considerations are illustrated by laboratory test results of grid-connected three phase bidirectional Z-source inverter.