EPE Association: EPE 2016 - DS2c: Advanced Power Converter Topologies

EPE 2016 - DS2c: Advanced Power Converter Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 02: Power Converter Topologies and Design > EPE 2016 - DS2c: Advanced Power Converter Topologies

   [return to parent folder]

   A simplified approach to input voltage balancing for series connected isolated DC-DC converters
By Kaspars KROICS [View]
[Download]

Abstract: The paper describes the operating principles of the balancing circuit, analyzes the fundamental relationships, introduces principles of the operation of the circuit. The paper shows experimental results based on a few practical application examples. The paper discusses design of the transformer with balancing winding for ISOP, ISOS and parallel connection of the DC-DC converters to provide independent voltage balancing of input capacitors.

   A Solid state Transformer based on a Single-Stage AC-DC Modular Cascaded Multilevel Converter
By Dalton HONORIO [View]
[Download]

Abstract: This paper proposes a single-stage ac-dc bidirectional power converter which provides power conditioning capability and insulation for solid-state transformers. The topology conception is presented, as well as its operation principles and the employed modulation technique. Some results are also discussed to validate the proposed modulation algorithm and the claimed advantages.

   Analysis of the Double Quadratic Buck Converter
By SAMIR AHMAD MUSSA [View]
[Download]

Abstract: The analysis DC-DC Double Quadratic Buck Converter is presented in this paper. This converter has the advantages of high static gain compared to the conventional Buck Converter. The topological symmetry reduce the stress voltage over the switches to half of the value compared with the conventional Quadratic Buck Converter and simplifies the modeling of the converter. The analysis is made for continuous, critical and discontinuous conduction mode and boundary curve between the conduction modes is shown. Finally, the simulation and experimental results are presented to prove the theoretical analysis.

   Benchmark of high-power STATCOM topologies for flicker compensation
By Hongyang ZHANG [View]
[Download]

Abstract: The current from an electrical arc furnace (EAF) in a steel plant is highly unsymmetrical, i.e. it comprises a large amount of negative sequence. This causes problems with the voltage stability in the capacitor submodules for a static synchronous compensator (STATCOM), when implemented using the modular multilevel converter (M2C) concept.In order to counteract the uncontrollability of the capacitor voltage, a common practice is to circulate a zero-sequence fundamental current or a direct current. The method brings the benefit of re-balancing the active power among the individual phases while it requires over-rating of the valve current or dc voltage of the STATCOM. This would in practice give a more expensive design.This paper presents a benchmark of various M2C-based STATCOM designs considering the valve overrating. The STATCOM topologies will be benchmarked with the EAF modeled for all possible combinations of positive- and negative-sequence current. The rating comparison considering the dc capacitor ripple and zero-sequence harmonic injection are discussed.

   Cell Design of a Square-Wave Powered 1AC-3AC Modular Multilevel Converter Low Voltage Prototype
By Mathias SCHNARRENBERGER [View]
[Download]

Abstract: This paper presents a novel design calculation scheme for low voltage Modular Multilevel Converters. One of the most important design values is to estimate the lifetime of the electrolytic cell capacitor. Therefore, a novel calculation method for the arm capacitor root mean square current is presented. Additionally, a new algorithm to estimate the power losses without a detailed simulation of the switching events is introduced. The results from these calculations are used to construct a low voltage Modular Multilevel Converter with 8 cells per arm.

   Comparison of High Frequency Inductors for Bidirectional DC-DC Converters for Electric Vehicles
By Garikoitz SARRIEGUI [View]
[Download]

Abstract: In this paper, different high frequency inductors for a DC-DC converter for electric vehicles aredesigned and compared. The interleaved bidirectional DC-DC converters are good candidates to boostthe battery pack voltage to the required voltage level, so that the traction inverters operate in anefficient manner. The use of wide bandgap devices allow to decrease the passive component size, asthe switching frequency is increased. Nevertheless, the different high frequency effects need to becarefully analyzed.Different high frequency inductors are designed and compared at a target switching frequency of 0.5-1 MHz and a maximum power of 5 kW. For this purpose, different core materials, shapes and windingconcepts are considered. An analytical and simulative analysis is first realized and then, the selectedinductors are prototyped and tested using a laboratory platform.

   Control Method and Prototyping of the Multistage Stacked Boost Architecture (MSBA)
By Gina STEINKE [View]
[Download]

Abstract: This paper includes a look into the resonant phenomena of the Multistage Stacked Boost Architectureand a dedicated control method for the MSBA converter to handle these resonances. A linearized fastfeed-forward control relying on the feedback of the output current was implemented for the booststage and the MSBA stages. This was verified by simulations as well as measurements with a lowvoltage prototype.

   Modified Dual-Transformer based Asymmetrical Dual- Bridge (MDT-ADB) Isolated DC-DC Converter
By Venkat Nag Someswar JAKKA [View]
[Download]

Abstract: Isolated dc-dc converters are increasingly being used in many industrial and utility applications suchas shipboard, hybrid and electric vehicles, microgrids, etc., for integrating the dc sources and storagedevices. A modified dual transformer based asymmetrical dual bridged isolated dc-dc (MDT-ADB)converter is proposed in this paper. MDT-ADB consists of three stages: input, isolation, and output. Theinput stage consists of a full bridge converter (FB), the isolation stage consists of two high-frequencytransformers, and the output stage consists of a semi-active three-leg converter (STL). In the isolationstage, the primary windings of the transformers are connected in series and the secondary windings areconnected in parallel across the load via STL to share the load power equally which decreases thecurrents flowing through some of the switches of STL. Therefore, the switching losses of these switchesare reduced. Further, MDT-ADB results in reduced circulating currents in the transformer windings aswell as in a wider range of the output voltage and power as compared those in the existing dualtransformer based asymmetrical dual bridge converter (DT-ADB). Additionally, all switches of MDTADBcan be operated with soft switching to obtain reduced losses. A detailed analysis of the modelingand control of MDT-ADB is presented. The discussed theoretical analysis is verified using simulationsand experimental results.

   Multiple Input, Single Output, Single Inductor DC-DC Converter Architecture Providing Charge Reuse by an Efficient High Voltage Current Sink
By Leo ROLFF [View]
[Download]

Abstract: Integrated gate-drivers for power MOSFETs require multiple supply voltages biasing internal circuitryor providing a high voltage ground to the high-side driver. This paper proposes a novel DC-DC converterarchitecture fulfilling these demands of modern gate-driver ASICs while increasing system efficiency. Inthe proposed concept a conventional single inductor DC-DC converter generating a low voltage supplyto auxiliary circuits from a high voltage input is extended by using the high-voltage ground of the gate-driver as an additional input to the converter. This input voltage is controlled to remain nearly constantby adapting its load current with an attached current sink. The charge drained from the high-voltageground by this current sink is reused to boost system efficiency of the converter. The developed conceptis also applicable to converters operating in higher power regimes.

   Proposed Novel Multiphase-Multilevel Inverter Configuration for Open-End Winding Loads
By Sanjeevikumar PADMANABAN [View]
[Download]

Abstract: This paper presents a new multiphase-multilevel inverter configuration for open-winding loads and suitable for medium power (low-voltage/high-current) applications such as `More Electric Aircraft'. Modular structure comprised of standard dual three-phase voltage source inverter (VSI) along with one additional bi-directional semi-conductor device (MOSFET/IGBT) per phase and two capacitors with neutral point. The additional switches and capacitors are introduced to generate the additional voltage levels in outputs of the VSI. An original modified single carrier five-level modulation (MSCFM) algorithm is developed in this work and overcomes the complexity of standard space vector modulations, easy for real implementation purposes in digital processors. Proposed six-phase multilevel inverter configuration generates multilevel outputs with benefit in comprises with standard multilevel inverter topologies. Further, the complete numerical model of the proposed AC converter along with pulse-width modulation (PWM) is developed with Matlab/PLECS simulation software's. A set of observed results is presented in balanced working condition and always shown good agreement with the theoretical developments.

   Reliability Modeling and Cost Optimization of High Power Parallel-Converter System
By Junxiang FANG [View]
[Download]

Abstract: In this paper a reliability analysis and cost optimization method for parallel power converter is proposed. Including a single converter reliability analysis model based on complex network, and a parallel system model to determine the optimum number of single converter X and N based on reliability analysis and cost analysis.

   ZVS Modulation Strategy for a Three-Phase Dual Active Bridge DC-DC Converter with Three-Level Phase-Legs
By Nico BAARS [View]
[Download]

Abstract: This paper analyzes a three-phase Dual Active Bridge (DAB) dc-dc converter with three-level phase-legs,showing a significant increase in the soft-switching region compared to two-level operation. A strategyis presented that results in a Zero Voltage Switching (ZVS) modulation scheme that relies on analyticalequations, uses a small amount of switching modes, and obtains close-to-minimal rms currents.

EPE 2016 - DS2c: Advanced Power Converter Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 02: Power Converter Topologies and Design > EPE 2016 - DS2c: Advanced Power Converter Topologies
	[return to parent folder]

	A simplified approach to input voltage balancing for series connected isolated DC-DC converters By Kaspars KROICS	[View] [Download]
Abstract: The paper describes the operating principles of the balancing circuit, analyzes the fundamental relationships, introduces principles of the operation of the circuit. The paper shows experimental results based on a few practical application examples. The paper discusses design of the transformer with balancing winding for ISOP, ISOS and parallel connection of the DC-DC converters to provide independent voltage balancing of input capacitors.

	A Solid state Transformer based on a Single-Stage AC-DC Modular Cascaded Multilevel Converter By Dalton HONORIO	[View] [Download]
Abstract: This paper proposes a single-stage ac-dc bidirectional power converter which provides power conditioning capability and insulation for solid-state transformers. The topology conception is presented, as well as its operation principles and the employed modulation technique. Some results are also discussed to validate the proposed modulation algorithm and the claimed advantages.

	Analysis of the Double Quadratic Buck Converter By SAMIR AHMAD MUSSA	[View] [Download]
Abstract: The analysis DC-DC Double Quadratic Buck Converter is presented in this paper. This converter has the advantages of high static gain compared to the conventional Buck Converter. The topological symmetry reduce the stress voltage over the switches to half of the value compared with the conventional Quadratic Buck Converter and simplifies the modeling of the converter. The analysis is made for continuous, critical and discontinuous conduction mode and boundary curve between the conduction modes is shown. Finally, the simulation and experimental results are presented to prove the theoretical analysis.

	Benchmark of high-power STATCOM topologies for flicker compensation By Hongyang ZHANG	[View] [Download]
Abstract: The current from an electrical arc furnace (EAF) in a steel plant is highly unsymmetrical, i.e. it comprises a large amount of negative sequence. This causes problems with the voltage stability in the capacitor submodules for a static synchronous compensator (STATCOM), when implemented using the modular multilevel converter (M2C) concept.In order to counteract the uncontrollability of the capacitor voltage, a common practice is to circulate a zero-sequence fundamental current or a direct current. The method brings the benefit of re-balancing the active power among the individual phases while it requires over-rating of the valve current or dc voltage of the STATCOM. This would in practice give a more expensive design.This paper presents a benchmark of various M2C-based STATCOM designs considering the valve overrating. The STATCOM topologies will be benchmarked with the EAF modeled for all possible combinations of positive- and negative-sequence current. The rating comparison considering the dc capacitor ripple and zero-sequence harmonic injection are discussed.

	Cell Design of a Square-Wave Powered 1AC-3AC Modular Multilevel Converter Low Voltage Prototype By Mathias SCHNARRENBERGER	[View] [Download]
Abstract: This paper presents a novel design calculation scheme for low voltage Modular Multilevel Converters. One of the most important design values is to estimate the lifetime of the electrolytic cell capacitor. Therefore, a novel calculation method for the arm capacitor root mean square current is presented. Additionally, a new algorithm to estimate the power losses without a detailed simulation of the switching events is introduced. The results from these calculations are used to construct a low voltage Modular Multilevel Converter with 8 cells per arm.

	Comparison of High Frequency Inductors for Bidirectional DC-DC Converters for Electric Vehicles By Garikoitz SARRIEGUI	[View] [Download]
Abstract: In this paper, different high frequency inductors for a DC-DC converter for electric vehicles aredesigned and compared. The interleaved bidirectional DC-DC converters are good candidates to boostthe battery pack voltage to the required voltage level, so that the traction inverters operate in anefficient manner. The use of wide bandgap devices allow to decrease the passive component size, asthe switching frequency is increased. Nevertheless, the different high frequency effects need to becarefully analyzed.Different high frequency inductors are designed and compared at a target switching frequency of 0.5-1 MHz and a maximum power of 5 kW. For this purpose, different core materials, shapes and windingconcepts are considered. An analytical and simulative analysis is first realized and then, the selectedinductors are prototyped and tested using a laboratory platform.

	Control Method and Prototyping of the Multistage Stacked Boost Architecture (MSBA) By Gina STEINKE	[View] [Download]
Abstract: This paper includes a look into the resonant phenomena of the Multistage Stacked Boost Architectureand a dedicated control method for the MSBA converter to handle these resonances. A linearized fastfeed-forward control relying on the feedback of the output current was implemented for the booststage and the MSBA stages. This was verified by simulations as well as measurements with a lowvoltage prototype.

	Modified Dual-Transformer based Asymmetrical Dual- Bridge (MDT-ADB) Isolated DC-DC Converter By Venkat Nag Someswar JAKKA	[View] [Download]
Abstract: Isolated dc-dc converters are increasingly being used in many industrial and utility applications suchas shipboard, hybrid and electric vehicles, microgrids, etc., for integrating the dc sources and storagedevices. A modified dual transformer based asymmetrical dual bridged isolated dc-dc (MDT-ADB)converter is proposed in this paper. MDT-ADB consists of three stages: input, isolation, and output. Theinput stage consists of a full bridge converter (FB), the isolation stage consists of two high-frequencytransformers, and the output stage consists of a semi-active three-leg converter (STL). In the isolationstage, the primary windings of the transformers are connected in series and the secondary windings areconnected in parallel across the load via STL to share the load power equally which decreases thecurrents flowing through some of the switches of STL. Therefore, the switching losses of these switchesare reduced. Further, MDT-ADB results in reduced circulating currents in the transformer windings aswell as in a wider range of the output voltage and power as compared those in the existing dualtransformer based asymmetrical dual bridge converter (DT-ADB). Additionally, all switches of MDTADBcan be operated with soft switching to obtain reduced losses. A detailed analysis of the modelingand control of MDT-ADB is presented. The discussed theoretical analysis is verified using simulationsand experimental results.

	Multiple Input, Single Output, Single Inductor DC-DC Converter Architecture Providing Charge Reuse by an Efficient High Voltage Current Sink By Leo ROLFF	[View] [Download]
Abstract: Integrated gate-drivers for power MOSFETs require multiple supply voltages biasing internal circuitryor providing a high voltage ground to the high-side driver. This paper proposes a novel DC-DC converterarchitecture fulfilling these demands of modern gate-driver ASICs while increasing system efficiency. Inthe proposed concept a conventional single inductor DC-DC converter generating a low voltage supplyto auxiliary circuits from a high voltage input is extended by using the high-voltage ground of the gate-driver as an additional input to the converter. This input voltage is controlled to remain nearly constantby adapting its load current with an attached current sink. The charge drained from the high-voltageground by this current sink is reused to boost system efficiency of the converter. The developed conceptis also applicable to converters operating in higher power regimes.

	Proposed Novel Multiphase-Multilevel Inverter Configuration for Open-End Winding Loads By Sanjeevikumar PADMANABAN	[View] [Download]
Abstract: This paper presents a new multiphase-multilevel inverter configuration for open-winding loads and suitable for medium power (low-voltage/high-current) applications such as `More Electric Aircraft'. Modular structure comprised of standard dual three-phase voltage source inverter (VSI) along with one additional bi-directional semi-conductor device (MOSFET/IGBT) per phase and two capacitors with neutral point. The additional switches and capacitors are introduced to generate the additional voltage levels in outputs of the VSI. An original modified single carrier five-level modulation (MSCFM) algorithm is developed in this work and overcomes the complexity of standard space vector modulations, easy for real implementation purposes in digital processors. Proposed six-phase multilevel inverter configuration generates multilevel outputs with benefit in comprises with standard multilevel inverter topologies. Further, the complete numerical model of the proposed AC converter along with pulse-width modulation (PWM) is developed with Matlab/PLECS simulation software's. A set of observed results is presented in balanced working condition and always shown good agreement with the theoretical developments.

	Reliability Modeling and Cost Optimization of High Power Parallel-Converter System By Junxiang FANG	[View] [Download]
Abstract: In this paper a reliability analysis and cost optimization method for parallel power converter is proposed. Including a single converter reliability analysis model based on complex network, and a parallel system model to determine the optimum number of single converter X and N based on reliability analysis and cost analysis.

	ZVS Modulation Strategy for a Three-Phase Dual Active Bridge DC-DC Converter with Three-Level Phase-Legs By Nico BAARS	[View] [Download]
Abstract: This paper analyzes a three-phase Dual Active Bridge (DAB) dc-dc converter with three-level phase-legs,showing a significant increase in the soft-switching region compared to two-level operation. A strategyis presented that results in a Zero Voltage Switching (ZVS) modulation scheme that relies on analyticalequations, uses a small amount of switching modes, and obtains close-to-minimal rms currents.