EPE Association: EPE 2018 - DS2c: Advanced Power Converter Topologies II

EPE 2018 - DS2c: Advanced Power Converter Topologies II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 02: Power Converter Topologies and Design > EPE 2018 - DS2c: Advanced Power Converter Topologies II

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   A Comparison of Modulation Techniques for Three-phase quasi Z-Source Modular Multilevel Converter Able to Provide DC-link Fault Blocking Capability
By Fatma KHERA [View]
[Download]

Abstract: Future transmission and distribution grids will use power converters to enable interface with HVDC systems and the Modular Multilevel Converter (MMC) is a topology that is already employed in commercial systems. The MMC converter inherent the benefits and also the limitations of Voltage Source Converters, the more important one being the capability to only step-down voltage from the DC side to the AC side. In cases where voltage step up is required, a quasi Z-source network can be added to produce the quasi Z-source MMC. This paper proposes three modulation techniques for a quasi Zsource modular multilevel converter (qZS-MMC) to provide voltage boost capability. In addition, it will be shown that the qZS-MMC can handle the blocking of DC-faults and prevent the buildup of the resulting short-circuit currents which is essential in transmissions and distribution power grids. The relations of average shoot-through duty ratio, the average value of the sub-modules capacitor voltage and the peak value of the output voltage have been derived for each modulation technique. A comparison between these techniques has been presented. The simulation results presented in the paper confirm the validity of the proposed modulation techniques and capability for DC-fault blocking.

   A new structure of non-isolated DC-DC cuk-boost converter
By Ali NAHAVANDI [View]
[Download]

Abstract: In this paper, a new structure of non-isolated DC-DC cuk-boost converter with high voltage gain is proposed. The proposed converter has high voltage gain and in comparison to similar converters has lower output voltage ripple and lower voltage stress on switches and diodes which makes it suitable for renewable energy applications. The validity of the proposed converter operation is verified by simulation results that are obtained by MATLAB software.

   Assymetrical Hybrid Multilevel Inverter With SHE Modulated NPC Cascaded By MPC Controlled CHB with Si/SiC Switches
By Guangye SI [View]
[Download]

Abstract: Main issues with the implementation of multilevel converters in high-power applications are high powerquality and minimum switching frequency. A combination of NPC and CHB with new schemes isproposed to find the middle ground in medium voltage applications. NPC is modulated with SHE toprovide active power and eliminate selected harmonics. On the other hand, CHB with floating capacitoris utilized as reactive power compensator. Floating capacitor eliminates the need for real DC source,hence, the volume of the auxiliary circuit can be smaller and less costly. MPC is deployed for CHB,which can compensate the higher order harmonics left by the main stage, stabilize the capacitor voltageand provide better dynamic response simultaneously. Experimental results validate the effectiveness ofthe proposed topology.

   Behavioral Analysis of a DC/DC Single-Switch High Step-up R2P2 Buck-Boost/Boost Converter
By Charoula ZOGOGIANNI [View]
[Download]

Abstract: In this paper, the analytical behavior for all modes of operation of a DC/DC single-switch high step-upReduced Redundant Power Processing (R2P2) I-IIA Buck-Boost/Boost converter is investigated. Theanalysis is very important in order to define correctly the design specifications of the converter for agiven application. Experimental results validate the theoretical analysis in all operational modes.Moreover, a photovoltaic application is considered and the efficiency of the converter is evaluated.

   Cost, Efficiency and Power Density Pareto Investigation of Three Phase Inverters
By Nicklas CHRISTENSEN [View]
[Download]

Abstract: Wide bandgap devices are enabling an increase in the efficiency and power density of converter systems. The properties of the wide bandgap devices are changing the optimum design parameters for converters. With a growing diversity of wide bandgap devices, it becomes increasingly difficult to select the optimum components, topology and design parameters for an application. This paper adresses challenges in identifying the optimum topology for wide bandgap devices and which components to select. Based on commercially available products and analytic equations, an algorithm is developed to aid the topology investigation. A three-dimensional plot is extracted from the algorithm, evaluating cost, efficiency and power density. The designs visually presented are the circuit combination fulfilling the design constraint. The algorithm allows the designer to select a topology, switching frequency and components based on an objective comparison.

   DC output wind turbine demonstrator, based on isolated DC-DC converter with Silicon Carbide semiconductors
By Leire MENDIZABAL [View]
[Download]

Abstract: Power density increase, price reduction of the solution and efficiency increase of the Wind Turbine Converters and windfarm grids are one of the challenges in the Wind sector. For that purpose, Power Converters and the use of Silicon Carbide semiconductors is a promising solution due to the enhanced performance in terms of switching behaviour and passive element reduction.This paper is focused on the use of Silicon Carbide (SiC) power devices for wind applications, combined with a new conception of Energy transport based on HVDC distribution systems.The solution proposed and developed for this paper is a DC output wind turbine, composed by isolated DC-DC converters based on Silicon Carbide semiconductors.

   Five-Level Inverter with Zero Volt Not Connected (ZVNC) for Medium Power : Analysis of Operating Mode
By Ignace RASOANARIVO [View]
[Download]

Abstract: In comparison with to the structure of the five-level NPP (Neutral Point Piloted) inverter, the studied topology has two less power transistors. The midpoints of bus bar DC voltage and the arms of the inverter are not connected. The balancing of the flying capacitances voltages involves an integrated control strategy.

   Investigation of the Operational Characteristics of a New High Step-Down Voltage Conversion Ratio Topology
By Stylianos SYRIGOS [View]
[Download]

Abstract: This work focuses on a new high step-down voltage conversion ratio topology. The converter has a wide voltage conversion ratio due to its dynamic interleaved characteristics since it can operate in two or three phase modes. Regardless of the phase shift mode, the converter features inherent automatic uniform current sharing at the output inductors, without any additional circuitry. The operational characteristics of the converter for each interleaved mode are explained via steady-state analysis and verified through a laboratory-built prototype.

   New Inverting Modified CUK Converter Configurations with Switched Inductor (MCCsi) for High-Voltage/Low-Current Renewable Applications
By Sanjeevikumar PADMANABAN [View]
[Download]

Abstract: Inverting Modified CUK Converter with Switched Inductor (MCCSI) configurations are articulated inthe paper for high-voltage and low-current renewable energy applications. Based on the SwitchedInductor (SI) position in MCC converter, four new modified CUK converter configurations areproposed as MCCSI-XLL, MCCSI-LYL, MCCSI-LLZ and MCCSI-XYZ. The mathematical analysis andcomparison is shown in terms of the voltage conversion ratio, number of active and reactivecomponents. The mode of operation of MCCSI-XLL configuration is discussed to understand theworking concept of MCCSI configurations. The striking features of the proposed configurations arediscussed in details. Operation of the proposed converter is verified by simulation in MatLab.

   Optimized Control of a Novel DC/3AC Converter Topology with Reduced Component Effort
By Christian AXTMANN [View]
[Download]

Abstract: A previously proposed converter topology can reduce component effort and converter volume by decreasing the pulsed voltage across the DC-converter inductance. However, the machines maximum phase voltage then becomes a function of the DC source voltage. In this paper, an optimization is presented to ensure a constant maximum phase voltage over a wide source voltage spread.

   Parallel Rectifier for Regenerative Hydrogen Production Utilizing a Combination of Thyristor and PWM-based Topologies
By Steffen BINTZ [View]
[Download]

Abstract: Hydrogen as storage medium for fluctuating renewable energy generation requires high current, lowvoltage rectifiers for grid integration and feeding of the electrolyzer. One topology for an efficient androbust rectifier, capable of supporting the grid, is the combination of well-known thyristor basedrectifiers with a PWM based active rectifier. The thyristor rectifier will be designed to deliver the mainpart of the output current. Hereby the aim is to use smallest possible passive components. The activerectifier has the purpose of correcting the input current waveform while automatically correcting theoverall output current to the desired direct current.The Boundary conditions for the desired application are shown, as well as the implementation and thecontrol considerations. The basic concept is then proved by simulation. For the basic topology,consisting of a six pulse thyristor rectifier and six-MOSFET full bridge experimental results areshown.

   The Coupling Coefficient impact on the DC Voltage Gain of the Passive Clamp Coupled Inductor Boost Converter
By Konstantinos ZAOSKOUFIS [View]
[Download]

Abstract: In this paper, the impact of the coupling coefficient K on the operation of the passive clamp coupled inductor Boost converter is investigated and an accurate dc voltage gain VN for Continues Conduction Mode (CCM) is deduced. It appears the dc voltage gain of the coupled inductor Boost converter is negatively affected, not only by the coupling coefficient, but also from the output current Io of the converter. The steady state analysis and the appropriate procedure for the dc voltage gain derivation are described. In order to examine the operation of the converter and the impact of the coupling coefficient K as well as the output current Io in CCM on the dc voltage gain VN of the converter, various curves are presented. Furthermore, experimental results based on a 250W laboratory prototype with two magnetic elements of different coupling coefficient are also presented for the evaluation of the theoretical analysis.

EPE 2018 - DS2c: Advanced Power Converter Topologies II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 02: Power Converter Topologies and Design > EPE 2018 - DS2c: Advanced Power Converter Topologies II
	[return to parent folder]

	A Comparison of Modulation Techniques for Three-phase quasi Z-Source Modular Multilevel Converter Able to Provide DC-link Fault Blocking Capability By Fatma KHERA	[View] [Download]
Abstract: Future transmission and distribution grids will use power converters to enable interface with HVDC systems and the Modular Multilevel Converter (MMC) is a topology that is already employed in commercial systems. The MMC converter inherent the benefits and also the limitations of Voltage Source Converters, the more important one being the capability to only step-down voltage from the DC side to the AC side. In cases where voltage step up is required, a quasi Z-source network can be added to produce the quasi Z-source MMC. This paper proposes three modulation techniques for a quasi Zsource modular multilevel converter (qZS-MMC) to provide voltage boost capability. In addition, it will be shown that the qZS-MMC can handle the blocking of DC-faults and prevent the buildup of the resulting short-circuit currents which is essential in transmissions and distribution power grids. The relations of average shoot-through duty ratio, the average value of the sub-modules capacitor voltage and the peak value of the output voltage have been derived for each modulation technique. A comparison between these techniques has been presented. The simulation results presented in the paper confirm the validity of the proposed modulation techniques and capability for DC-fault blocking.

	A new structure of non-isolated DC-DC cuk-boost converter By Ali NAHAVANDI	[View] [Download]
Abstract: In this paper, a new structure of non-isolated DC-DC cuk-boost converter with high voltage gain is proposed. The proposed converter has high voltage gain and in comparison to similar converters has lower output voltage ripple and lower voltage stress on switches and diodes which makes it suitable for renewable energy applications. The validity of the proposed converter operation is verified by simulation results that are obtained by MATLAB software.

	Assymetrical Hybrid Multilevel Inverter With SHE Modulated NPC Cascaded By MPC Controlled CHB with Si/SiC Switches By Guangye SI	[View] [Download]
Abstract: Main issues with the implementation of multilevel converters in high-power applications are high powerquality and minimum switching frequency. A combination of NPC and CHB with new schemes isproposed to find the middle ground in medium voltage applications. NPC is modulated with SHE toprovide active power and eliminate selected harmonics. On the other hand, CHB with floating capacitoris utilized as reactive power compensator. Floating capacitor eliminates the need for real DC source,hence, the volume of the auxiliary circuit can be smaller and less costly. MPC is deployed for CHB,which can compensate the higher order harmonics left by the main stage, stabilize the capacitor voltageand provide better dynamic response simultaneously. Experimental results validate the effectiveness ofthe proposed topology.

	Behavioral Analysis of a DC/DC Single-Switch High Step-up R2P2 Buck-Boost/Boost Converter By Charoula ZOGOGIANNI	[View] [Download]
Abstract: In this paper, the analytical behavior for all modes of operation of a DC/DC single-switch high step-upReduced Redundant Power Processing (R2P2) I-IIA Buck-Boost/Boost converter is investigated. Theanalysis is very important in order to define correctly the design specifications of the converter for agiven application. Experimental results validate the theoretical analysis in all operational modes.Moreover, a photovoltaic application is considered and the efficiency of the converter is evaluated.

	Cost, Efficiency and Power Density Pareto Investigation of Three Phase Inverters By Nicklas CHRISTENSEN	[View] [Download]
Abstract: Wide bandgap devices are enabling an increase in the efficiency and power density of converter systems. The properties of the wide bandgap devices are changing the optimum design parameters for converters. With a growing diversity of wide bandgap devices, it becomes increasingly difficult to select the optimum components, topology and design parameters for an application. This paper adresses challenges in identifying the optimum topology for wide bandgap devices and which components to select. Based on commercially available products and analytic equations, an algorithm is developed to aid the topology investigation. A three-dimensional plot is extracted from the algorithm, evaluating cost, efficiency and power density. The designs visually presented are the circuit combination fulfilling the design constraint. The algorithm allows the designer to select a topology, switching frequency and components based on an objective comparison.

	DC output wind turbine demonstrator, based on isolated DC-DC converter with Silicon Carbide semiconductors By Leire MENDIZABAL	[View] [Download]
Abstract: Power density increase, price reduction of the solution and efficiency increase of the Wind Turbine Converters and windfarm grids are one of the challenges in the Wind sector. For that purpose, Power Converters and the use of Silicon Carbide semiconductors is a promising solution due to the enhanced performance in terms of switching behaviour and passive element reduction.This paper is focused on the use of Silicon Carbide (SiC) power devices for wind applications, combined with a new conception of Energy transport based on HVDC distribution systems.The solution proposed and developed for this paper is a DC output wind turbine, composed by isolated DC-DC converters based on Silicon Carbide semiconductors.

	Five-Level Inverter with Zero Volt Not Connected (ZVNC) for Medium Power : Analysis of Operating Mode By Ignace RASOANARIVO	[View] [Download]
Abstract: In comparison with to the structure of the five-level NPP (Neutral Point Piloted) inverter, the studied topology has two less power transistors. The midpoints of bus bar DC voltage and the arms of the inverter are not connected. The balancing of the flying capacitances voltages involves an integrated control strategy.

	Investigation of the Operational Characteristics of a New High Step-Down Voltage Conversion Ratio Topology By Stylianos SYRIGOS	[View] [Download]
Abstract: This work focuses on a new high step-down voltage conversion ratio topology. The converter has a wide voltage conversion ratio due to its dynamic interleaved characteristics since it can operate in two or three phase modes. Regardless of the phase shift mode, the converter features inherent automatic uniform current sharing at the output inductors, without any additional circuitry. The operational characteristics of the converter for each interleaved mode are explained via steady-state analysis and verified through a laboratory-built prototype.

	New Inverting Modified CUK Converter Configurations with Switched Inductor (MCCsi) for High-Voltage/Low-Current Renewable Applications By Sanjeevikumar PADMANABAN	[View] [Download]
Abstract: Inverting Modified CUK Converter with Switched Inductor (MCCSI) configurations are articulated inthe paper for high-voltage and low-current renewable energy applications. Based on the SwitchedInductor (SI) position in MCC converter, four new modified CUK converter configurations areproposed as MCCSI-XLL, MCCSI-LYL, MCCSI-LLZ and MCCSI-XYZ. The mathematical analysis andcomparison is shown in terms of the voltage conversion ratio, number of active and reactivecomponents. The mode of operation of MCCSI-XLL configuration is discussed to understand theworking concept of MCCSI configurations. The striking features of the proposed configurations arediscussed in details. Operation of the proposed converter is verified by simulation in MatLab.

	Optimized Control of a Novel DC/3AC Converter Topology with Reduced Component Effort By Christian AXTMANN	[View] [Download]
Abstract: A previously proposed converter topology can reduce component effort and converter volume by decreasing the pulsed voltage across the DC-converter inductance. However, the machines maximum phase voltage then becomes a function of the DC source voltage. In this paper, an optimization is presented to ensure a constant maximum phase voltage over a wide source voltage spread.

	Parallel Rectifier for Regenerative Hydrogen Production Utilizing a Combination of Thyristor and PWM-based Topologies By Steffen BINTZ	[View] [Download]
Abstract: Hydrogen as storage medium for fluctuating renewable energy generation requires high current, lowvoltage rectifiers for grid integration and feeding of the electrolyzer. One topology for an efficient androbust rectifier, capable of supporting the grid, is the combination of well-known thyristor basedrectifiers with a PWM based active rectifier. The thyristor rectifier will be designed to deliver the mainpart of the output current. Hereby the aim is to use smallest possible passive components. The activerectifier has the purpose of correcting the input current waveform while automatically correcting theoverall output current to the desired direct current.The Boundary conditions for the desired application are shown, as well as the implementation and thecontrol considerations. The basic concept is then proved by simulation. For the basic topology,consisting of a six pulse thyristor rectifier and six-MOSFET full bridge experimental results areshown.

	The Coupling Coefficient impact on the DC Voltage Gain of the Passive Clamp Coupled Inductor Boost Converter By Konstantinos ZAOSKOUFIS	[View] [Download]
Abstract: In this paper, the impact of the coupling coefficient K on the operation of the passive clamp coupled inductor Boost converter is investigated and an accurate dc voltage gain VN for Continues Conduction Mode (CCM) is deduced. It appears the dc voltage gain of the coupled inductor Boost converter is negatively affected, not only by the coupling coefficient, but also from the output current Io of the converter. The steady state analysis and the appropriate procedure for the dc voltage gain derivation are described. In order to examine the operation of the converter and the impact of the coupling coefficient K as well as the output current Io in CCM on the dc voltage gain VN of the converter, various curves are presented. Furthermore, experimental results based on a 250W laboratory prototype with two magnetic elements of different coupling coefficient are also presented for the evaluation of the theoretical analysis.