Towards a 30 kW/liter, Three-Phase Unity Power Factor Rectifier

Round, S.D.; Karutz, P.; Heldwein, Marcelo Lobo; Kolar, Johann W.

doi:10.1109/pccon.2007.373126

Cited by 45 publications

(10 citation statements)

References 12 publications

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“…Switching charges the inductor which drives the current through the bidirectional switch. Deactivating the switch increases the current to bypass the switch [3]. This results in a negative voltage across the inductor and drains it.…”

Section: Current Control and Balance Of The Neutral Point At The Dc-smentioning

confidence: 99%

Mitigation of Harmonics Using Thyristor Based 12 Pulse Voltage Source PWM Rectifier

Sarali¹

2012

IJRET

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Three-phase thyristor rectifiers have been used in industries for obtaining a variable dc voltage, but they have a problem of including large lower-order harmonics in the input currents. For high-power applications, a 12-pulse configuration is useful for reducing the harmonics, but it still includes the (12m ± 1) th (m: integer) harmonics. In order to further reduce the harmonics, this paper proposes to supply a ramp wave voltage at the input of a 12-pulse phase-controlled rectifier. Theoretical investigation to reduce harmonics is presented, and a strategy to control the regulated voltage and unity power factor at input side based on 12 pulse modulation technique. This paper discuss the impact of using 3-phase and 12-pulse rectifier circuit commonly found in unity power factor at input ac mains and regulate output voltage. The 12-pulse topology is known to be more expensive, but produce the least input current harmonics. However, the latter statement is completely true under balanced line conditions. In practice, the lines are inherently unbalanced. Hence, the question of whether the 12-pulse rectifier will indeed perform better in terms of the harmonics injected to the line is still under ongoing discussions. This presents the modelling and simulation of both rectifier topologies to compare their input current and regulated output voltage harmonics. The rectifiers are modelled using the MATLAB/SIMULINK simulation model and several common cases conditions will be simulated to compare their harmonic levels.

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Section: Current Control and Balance Of The Neutral Point At The Dc-smentioning

confidence: 99%

Mitigation of Harmonics Using Thyristor Based 12 Pulse Voltage Source PWM Rectifier

Sarali¹

2012

IJRET

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“…Unfortunately these devices exhibit, apart from their excellent conduction behaviour, a relative large turn-off delay at lower current levels [17]. This results in increased current zero-crossing distortions, especially at the intended high switching frequencies [18]. In order to attenuate this effect a current feed-forward signal iff,i is used to compensate the delay.…”

Section: B Controller Designmentioning

confidence: 99%

High-frequency, three-phase current controller implementation in an FPGA

Hartmann

Round

Kolar

2008

2008 11th Workshop on Control and Modeling for Power Electronics

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Three phase rectifiers with switching frequencies of 500 kHz or more require high speed current controllers. At such high switching frequencies analog controllers as well as high speed DSP-systems have limited performance. In this paper, two high speed current controller implementations using two different FPGAs -one for switching frequencies up to 1 MHz and one for switching frequencies beyond 1 MHz -are presented to overcome this performance limitation. Starting with the digital system design all the blocks of the signal chain, containing A/D interface, digital controller implementation using HW-multipliers and implementation of a novel high speed, high resolution PWM are discussed and compared. Final measurements verify the performance of the controllers.

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“…An 8.5 kW/liter forced-aircooled 10 kW rectifier and a 10 kW/liter water-cooled rectifier are achieved at a switching frequency of 400 kHz. An 18.5 kW/liter water-cooled converter is achieved by applying higher switching frequencies up to 2.5 MHz (11) . However applying higher switching frequencies increases the switching losses and requires new materials for the magnetic components or larger heat sinks.…”

Section: Introductionmentioning

confidence: 99%

High Power Density SiC-Based Inverter with a Power Density of 70kW/liter or 50kW/kg

et al. 2019

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This paper presents a high power density silicon carbide (SiC)-based inverter, with a two-level voltage-source structure having forced air cooling, which provides a high volumetric power density of 70 kW/liter or 50 kW/kg in gravimetric terms. In order to achieve a power density greater than that of conventional inverters, the losses must be reduced or the cooling performance must be improved. Small lightweight SiC MOSFET power modules with directly soldered foil fins having good thermal conductivities, are developed in this study. The antiparallel SiC Schottky barrier diodes (SBDs) are removed from the modules to improve the power density. Gate drivers are developed to reduce the switching losses and switching time. A prototype of the proposed high power density inverter, which includes the developed power modules and proposed gate driver, is fabricated. The volume and weight of the prototype inverter are approximately 0.5 liter and 660 g, respectively. Experimental results confirm that the prototype inverter can operate continuously with an output power up to 35 kW. Therefore, the power density of the prototype inverter is approximately 70 kW/liter or 50 kW/kg. The efficiency of the prototype inverter is found to be more than 98%. Hence, the measures undertaken in this study have been verified to improve the power density of the inverters. The proposed high power density inverters can be applied in future aircraft and other electric vehicles.

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Towards a 30 kW/liter, Three-Phase Unity Power Factor Rectifier

Cited by 45 publications

References 12 publications

Mitigation of Harmonics Using Thyristor Based 12 Pulse Voltage Source PWM Rectifier

Mitigation of Harmonics Using Thyristor Based 12 Pulse Voltage Source PWM Rectifier

High-frequency, three-phase current controller implementation in an FPGA

High Power Density SiC-Based Inverter with a Power Density of 70kW/liter or 50kW/kg

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