EPE Association: EPE 2017 - DS2b: Advanced Power Converter Topologies II

EPE 2017 - DS2b: Advanced Power Converter Topologies II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 02: Power Converter Topologies and Design > EPE 2017 - DS2b: Advanced Power Converter Topologies II

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   A Novel Hybrid Converter Derived from Buck-Boost Circuit For Standalone Applications
By Milind BAGEWADI [View]
[Download]

Abstract: This paper proposes a single-switch circuit derived from buck boost converter which converts input DC voltage into desirable AC and DC voltages. The switching strategy used is sinusoidal pulse width modulation with a DC offset-known as augmented sinusoidal pulse width modulation (ASPWM). The ASPWM waveform is obtained by sine triangle comparison method where the modulating signal is the combination of a sinusoidal signal-obtained from the AC output - and a DC offset- obtained from the DC output. The AC output voltage is predominantly controlled by the amplitude of AC component of the modulating signal, while, the DC output is predominantly controlled by the DC component of the modulating signal. The two possibilities of tapping the AC voltage from the converter have been explained and the method of `tapping the voltage across the switch' is considered for analysis and simulation. The circuit is extensively simulated in MATLAB. The proposed circuit has applications in PV fed nanogrids for domestic stand alone applications.

   Analysis of Space Vector Diagram of a Modular H-Bridge Converter with Bypassed Cells during Fault Condition
By HARSHA VARDHAN [View]
[Download]

Abstract: This paper proposes a new analysis for the fault tolerant operation of Modular H-Bridge Converterusing space vector diagram. The converter can be operated during fault condition after bypassing offaulty cells. Geometrical analysis is included to create balanced line voltages from unbalanced polevoltages due to bypass of faulty cells. The space vector diagram of unbalanced pole voltages becomesan irregular six sided polygon and depending on the number of cells faulty, the space vector diagramalters its shape. Sine-triangle based implementation of the space vector diagram is used to derive ageneral expression for common mode voltage. The modulation index is maximized by addition ofcommon mode voltage. The biggest circle inscribed the irregular six sided polygon gives anexpression for the maximum modulation index. The modified reference waveform is used in LevelShifted Pulse Width Modulation (LSPWM) technique for the converter topology. Simulation andexperimental results are included to validate the proposed strategy.

   Basic Crossover Correction Cells for High Precision Power Amplifiers
By Baris DAI [View]
[Download]

Abstract: In order to achieve high-quality, high-dynamic power amplification a method is proposed to split andprocess the current ripple independently from the main bulk current. As a consequence, low-powerswitching circuits with reduced stress, so-called basic crossover correction cells, can be effectively applied.Comparisons are presented to validate the proposals.

   Bidirectional multilevel switched-capacitor resonant converter based on SiC MOSFET switches
By Adam KAWA [View]
[Download]

Abstract: This paper presents the verification of a concept of operation and the in-depth analysis of the bidirectional multilevel switched capacitor converter with high voltage ratio and strongly limited stresses of switches. These features as well as efficiency and effective voltage ratio are investigated analytically by simulations and experiments presenting many original results.

   Control of a Three-Phase to Five-Phase Modular Multilevel Matrix Converter Based on a Generalized Control Concept
By Dennis KARWATZKI [View]
[Download]

Abstract: In this paper a generalized control approach for modular multilevel converters is applied to a converter connecting a three-phase and a five-phase system directly without any central DC link. This new 3 x 5 modular multilevel matrix converter offers an alternative to other multilevel converters applied to five - phase machines, but foremost acts as example to prove the generality of the control. The cascaded control structure consists of an inner current control and an outer branch energy balancing control. Both are systematically derived and verified by simulation.

   DC-DC Converter Based on the Switched-Coupled-Inductor Quadratic Boost Converter and Diode-Capacitor Dickson Multiplier
By Boris AXELROD [View]
[Download]

Abstract: The very high voltage ratio has been achieved by introducing the switched-coupled-inductor to the quadratic boost converter and combining it with the diode-capacitor Dickson multiplier. The operating principles and steady-state analyses of continuous conduction mode are performed. The formulas to calculate the maximal voltage stresses on the transistor and on the diodes are provided. Simulation and experimental results of the 50W prototype confirm the theoretical analysis and the advantages of the proposed converter.

   IGBT/MOSFET Hybrid Bridge with Phase Shift and Frequency Modulation Control for a Bi-directional Series Resonant Converter
By Takae SHIMADA [View]
[Download]

Abstract: A circuit topology and its control for a bi-directional isolated series resonant converter (SRC) are proposed. In general SRCs, when the output voltage is decreased, the turn-off current and the switching frequency are increased and efficiency is decreased due to the increase of switching loss. MOSFETs are therefore mainly used, as MOSFETs have a lower turn-off loss than IGBTs. In the present study, to achieve both low cost and high efficiency, the proposed converter utilizes an IGBT/MOSFET hybrid bridge that consists of an IGBT leg and a MOSFET leg to form a full bridge. In the proposed control using phase shift with pulse-frequency modulation, MOSFET is turned off first and the IGBT current is decreased. After that, the IGBT is turned off at reduced current. The results of testing demonstrated that the proposed control reduces the turn-off current of the IGBT and also the switching frequency under conditions of low output voltage. A prototyped converter showed 96.6 \% efficiency at the IGBT switching frequency of 117.7 kHz.

   Low-Voltage PV Power Integration for Variable Frequency Drives Application
By AKSHATHA SHETTY [View]
[Download]

Abstract: Renewable sources like solar photovoltaic (PV) are preferred to be operated at low voltages. This necessitateshigh voltage boosting when they have to be connected to the high voltage DC bus. ConventionalDC-DC converters (eg. boost and buck-boost) offer high voltage gain at the cost of reduced efficiency.This paper proposes a novel method to integrate low voltage PV power to the high voltage DC bus usinga simple boost converter. The analysis of the proposed topology and control strategies are discussed.Simulation studies are carried out in MATLAB/SIMULINK and results for the same are presented.

   Switching Strategies of a Resonant Switched-Capacitor Voltage Multiplier
By Adam PENCZEK [View]
[Download]

Abstract: This paper presents research results of switching strategies of a power electronic resonant zero currentswitching (ZCS) DC-DC switched-capacitor voltage multiplier (SCVM). The SCVM can operateunder the various switching methods, which determine the rated power of the converter, its efficiency,capacitors selection, as well as the input and output current waveforms. The switching strategies aredemonstrated and compared by mathematical analysis and simulation results. The important findingsare verified experimentally in a three-cell SCVM DC-DC resonant boost converter.

EPE 2017 - DS2b: Advanced Power Converter Topologies II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 02: Power Converter Topologies and Design > EPE 2017 - DS2b: Advanced Power Converter Topologies II
	[return to parent folder]

	A Novel Hybrid Converter Derived from Buck-Boost Circuit For Standalone Applications By Milind BAGEWADI	[View] [Download]
Abstract: This paper proposes a single-switch circuit derived from buck boost converter which converts input DC voltage into desirable AC and DC voltages. The switching strategy used is sinusoidal pulse width modulation with a DC offset-known as augmented sinusoidal pulse width modulation (ASPWM). The ASPWM waveform is obtained by sine triangle comparison method where the modulating signal is the combination of a sinusoidal signal-obtained from the AC output - and a DC offset- obtained from the DC output. The AC output voltage is predominantly controlled by the amplitude of AC component of the modulating signal, while, the DC output is predominantly controlled by the DC component of the modulating signal. The two possibilities of tapping the AC voltage from the converter have been explained and the method of `tapping the voltage across the switch' is considered for analysis and simulation. The circuit is extensively simulated in MATLAB. The proposed circuit has applications in PV fed nanogrids for domestic stand alone applications.

	Analysis of Space Vector Diagram of a Modular H-Bridge Converter with Bypassed Cells during Fault Condition By HARSHA VARDHAN	[View] [Download]
Abstract: This paper proposes a new analysis for the fault tolerant operation of Modular H-Bridge Converterusing space vector diagram. The converter can be operated during fault condition after bypassing offaulty cells. Geometrical analysis is included to create balanced line voltages from unbalanced polevoltages due to bypass of faulty cells. The space vector diagram of unbalanced pole voltages becomesan irregular six sided polygon and depending on the number of cells faulty, the space vector diagramalters its shape. Sine-triangle based implementation of the space vector diagram is used to derive ageneral expression for common mode voltage. The modulation index is maximized by addition ofcommon mode voltage. The biggest circle inscribed the irregular six sided polygon gives anexpression for the maximum modulation index. The modified reference waveform is used in LevelShifted Pulse Width Modulation (LSPWM) technique for the converter topology. Simulation andexperimental results are included to validate the proposed strategy.

	Basic Crossover Correction Cells for High Precision Power Amplifiers By Baris DAI	[View] [Download]
Abstract: In order to achieve high-quality, high-dynamic power amplification a method is proposed to split andprocess the current ripple independently from the main bulk current. As a consequence, low-powerswitching circuits with reduced stress, so-called basic crossover correction cells, can be effectively applied.Comparisons are presented to validate the proposals.

	Bidirectional multilevel switched-capacitor resonant converter based on SiC MOSFET switches By Adam KAWA	[View] [Download]
Abstract: This paper presents the verification of a concept of operation and the in-depth analysis of the bidirectional multilevel switched capacitor converter with high voltage ratio and strongly limited stresses of switches. These features as well as efficiency and effective voltage ratio are investigated analytically by simulations and experiments presenting many original results.

	Control of a Three-Phase to Five-Phase Modular Multilevel Matrix Converter Based on a Generalized Control Concept By Dennis KARWATZKI	[View] [Download]
Abstract: In this paper a generalized control approach for modular multilevel converters is applied to a converter connecting a three-phase and a five-phase system directly without any central DC link. This new 3 x 5 modular multilevel matrix converter offers an alternative to other multilevel converters applied to five - phase machines, but foremost acts as example to prove the generality of the control. The cascaded control structure consists of an inner current control and an outer branch energy balancing control. Both are systematically derived and verified by simulation.

	DC-DC Converter Based on the Switched-Coupled-Inductor Quadratic Boost Converter and Diode-Capacitor Dickson Multiplier By Boris AXELROD	[View] [Download]
Abstract: The very high voltage ratio has been achieved by introducing the switched-coupled-inductor to the quadratic boost converter and combining it with the diode-capacitor Dickson multiplier. The operating principles and steady-state analyses of continuous conduction mode are performed. The formulas to calculate the maximal voltage stresses on the transistor and on the diodes are provided. Simulation and experimental results of the 50W prototype confirm the theoretical analysis and the advantages of the proposed converter.

	IGBT/MOSFET Hybrid Bridge with Phase Shift and Frequency Modulation Control for a Bi-directional Series Resonant Converter By Takae SHIMADA	[View] [Download]
Abstract: A circuit topology and its control for a bi-directional isolated series resonant converter (SRC) are proposed. In general SRCs, when the output voltage is decreased, the turn-off current and the switching frequency are increased and efficiency is decreased due to the increase of switching loss. MOSFETs are therefore mainly used, as MOSFETs have a lower turn-off loss than IGBTs. In the present study, to achieve both low cost and high efficiency, the proposed converter utilizes an IGBT/MOSFET hybrid bridge that consists of an IGBT leg and a MOSFET leg to form a full bridge. In the proposed control using phase shift with pulse-frequency modulation, MOSFET is turned off first and the IGBT current is decreased. After that, the IGBT is turned off at reduced current. The results of testing demonstrated that the proposed control reduces the turn-off current of the IGBT and also the switching frequency under conditions of low output voltage. A prototyped converter showed 96.6 \% efficiency at the IGBT switching frequency of 117.7 kHz.

	Low-Voltage PV Power Integration for Variable Frequency Drives Application By AKSHATHA SHETTY	[View] [Download]
Abstract: Renewable sources like solar photovoltaic (PV) are preferred to be operated at low voltages. This necessitateshigh voltage boosting when they have to be connected to the high voltage DC bus. ConventionalDC-DC converters (eg. boost and buck-boost) offer high voltage gain at the cost of reduced efficiency.This paper proposes a novel method to integrate low voltage PV power to the high voltage DC bus usinga simple boost converter. The analysis of the proposed topology and control strategies are discussed.Simulation studies are carried out in MATLAB/SIMULINK and results for the same are presented.

	Switching Strategies of a Resonant Switched-Capacitor Voltage Multiplier By Adam PENCZEK	[View] [Download]
Abstract: This paper presents research results of switching strategies of a power electronic resonant zero currentswitching (ZCS) DC-DC switched-capacitor voltage multiplier (SCVM). The SCVM can operateunder the various switching methods, which determine the rated power of the converter, its efficiency,capacitors selection, as well as the input and output current waveforms. The switching strategies aredemonstrated and compared by mathematical analysis and simulation results. The important findingsare verified experimentally in a three-cell SCVM DC-DC resonant boost converter.