T. Bruckner

Technische Universität Dresden, Dresden, Saxony, Germany

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Publications (15)33.52 Total impact

  • J.A. Sayago, T. Bruckner, S. Bernet
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    ABSTRACT: The application of a particular medium-voltage converter in a certain application depends on numerous criteria. However, in completely new installations, the choice of the system voltage is very often uninhibited of external constraints. Then, the voltage level shall be selected to enable the most efficient power conversion at the lowest cost. This paper is dedicated to help in finding the best voltage level for three-level neutral-point-clamped voltage source converters (3L-NPC VSCs) with respect to the power semiconductor devices. Three insulated-gate-bipolar-transistor-based 3L-NPC VSCs of different voltage levels (2.3, 3.3, and 4.16 kV) are investigated and compared regarding their maximum output power, semiconductor efficiency, and semiconductor cost per MVA output power. The effects of thermal cycling, the loss distribution within the converter, and switching frequencies from 300 to 1050 Hz are considered in the evaluation.
    IEEE Transactions on Industrial Electronics 10/2008; · 6.50 Impact Factor
  • J.A. Sayago, S. Bernet, T. Bruckner
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    ABSTRACT: Recently the 3L-ANPC-VSC was introduced to overcome the unequal loss distribution and the resulting unsymmetrical semiconductor junction temperature distribution as main structural drawback of the 3L-NPC-VSC. This paper compares conventional 3L-NPC-VSCs with 3L-ANPC-VSCs using 3.3 kV, 4.5 kV, and 6.5 kV IGBT modules for industrial Medium Voltage Drives for rated converter output voltages of V<sub>LL</sub> = 2.3 kV, 3.3 kV, and 4.16 kV in a switching frequency range of f<sub>s</sub> = 300 Hz to 1050 Hz. Maximum achievable converter power, converter efficiency, switch utilization, active silicon area and material costs are determined and compared for given IGBT and diode modules. The comparison is the basis for a derivation of advantageous operating conditions of 3L-NPC-VSCs and 3L-ANPC-VSCs.
    Power Electronics Specialists Conference, 2008. PESC 2008. IEEE; 07/2008
  • T. Bruckner, R. Jakob
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    ABSTRACT: The three-level NPC VSC topology and press-pack IGBT (PPI) devices are the key technologies for high-power medium-voltage (MV) drives. In this paper, a novel design for a MV inverter based on these technologies is presented. The main feature of the new converter is the integration of the dc-capacitor bank into the converter cubicle. Any kind of clamp capacitors are omitted. This simplifies the converter structure and reduces the part count, thus increasing its reliability and power density. The design of the low-inductive bus bars between the semiconductor stacks and the dc capacitor bank, the mechanical design, and the controls are discussed in the paper. Measurement results are presented that prove the excellent performance of the inverter.
    Power Electronics Specialists Conference, 2008. PESC 2008. IEEE; 07/2008
  • T. Bruckner, S. Bernet, P.K. Steimer
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    ABSTRACT: The three-level neutral-point-clamped voltage-source converter (NPC VSC) is widely used in high-power medium-voltage (MV) applications. To overcome its major drawback - the unequal loss distribution among the semiconductors - the use of active NPC (ANPC) switches was previously proposed. In this paper, a simple feedforward loss-control scheme for the ANPC converter is presented. The principle of operation of the ANPC VSC is experimentally verified for the first time. Electrical measurements on a low-voltage test bench prove the proper function of the ANPC converter. Infrared junction temperature measurements confirm the improved loss distribution using the new loss-control scheme. Finally, the authors demonstrate the superior performance of the loss-controlled ANPC converter in various MV applications.
    IEEE Transactions on Industry Applications 12/2007; · 1.67 Impact Factor
  • T. Bruckner, S. Bernet
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    ABSTRACT: The design of a power converter must guarantee that the operating junction temperatures thetav<sub>j</sub> of all devices do not exceed their limits under all specified operating conditions. Usually, this is ensured by a simulative or analytical junction temperature estimation based on simple electrical and thermal models and semiconductor datasheet values. This paper discusses the difficulties and quantifies the limitations of this approach on the example of a three-level neutral point clamped voltage source converter (NPC VSC) with insulated gate bipolar transistors. The calculations are compared to the results of direct junction temperature measurements with an infrared camera. The paper also provides the experimental proof for the unequal loss and junction temperature distribution in the three-level NPC VSC
    IEEE Transactions on Power Electronics 02/2007; · 5.73 Impact Factor
  • Thomas Bruckner, Steffen Bernet
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    ABSTRACT: The three-level neutral point clamped voltage source converter (NPC VSC) is widely used in high-power, medium-voltage applications. To overcome its major drawback-the unequal loss distribution among the semiconductors-the use of active NPC switches (ANPC) was proposed previously. In this paper, a simple feedforward loss-control scheme for the ANPC converter is presented. The principle of operation of the ANPC VSC is verified experimentally for the first time. Electrical measurements on a low-voltage test bench prove the proper function of the ANPC converter. Infrared junction temperature measurements confirm the improved loss distribution. Finally, the authors demonstrate the superior performance of the ANPC converter in various medium-voltage applications.
    Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005; 11/2005
  • Thomas Bruckner, Steffen Bernet
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    ABSTRACT: The design of a power converter must guarantee that the operating junction temperatures v<sub>j</sub> of all devices do not exceed their limits under all specified operating conditions. Usually, this is ensured by a simulative or analytical junction temperature estimation based on simple electrical and thermal models and semiconductor datasheet values. This paper discusses the difficulties and quantifies the limitations of this approach on the example of a three-level NPC VSC with IGBTs. The calculations are compared to the results of direct junction temperature measurements with an infrared camera. The paper also provides the experimental proof for the unequal loss and junction temperature distribution in the three-level NPC VSC.
    Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005; 11/2005
  • T. Bruckner, S. Bernet, H. Guldner
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    ABSTRACT: The three-level neutral-point-clamped voltage-source converter (NPC VSC) is widely used in high-power medium-voltage applications. The unequal loss distribution among the semiconductors is one major disadvantage of this popular topology. This paper studies the loss distribution problem of the NPC VSC and proposes the active NPC VSC to overcome this drawback. The switch states and commutations of the converter are analyzed. A loss-balancing scheme is introduced, enabling a substantially increased output power and an improved performance at zero speed, compared to the conventional NPC VSC.
    IEEE Transactions on Industrial Electronics 07/2005; · 6.50 Impact Factor
  • T. Bruckner, D.G. Holmes
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    ABSTRACT: The three-level neutral-point-clamped voltage source inverter is widely used in high power, medium voltage applications. This paper studies continuous and discontinuous pulse-width modulation for this inverter. Detailed analysis of discontinuous modulation shows that the average switching frequency is not directly proportional to the carrier or sampling frequency, since additional switching transitions occur between different regions of discontinuity. At typical switching frequencies for high power applications (up to 2 kHz) these additional transitions contribute significantly to the inverter's total losses, so that a proper comparison of the harmonic performance can only be carried out under constant loss conditions with varying carrier frequency. This comparison is performed for a typical industrial medium voltage inverter. The paper then considers the major issues of neutral-point voltage balancing and loss distribution within the inverter, for the identified optimal modulation schemes.
    IEEE Transactions on Power Electronics 02/2005; · 5.73 Impact Factor
  • Source
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    ABSTRACT: In the field of power electronics the power electronics building block (PEBB) is a key functional component. With regard to the applications, it is of outmost importance that the PEBB technology used is compact, cost-effective and reliable. The IGCT is at the forefront of technology in high power, medium-voltage applications. For further improvement in size and costs a new ANPC IGCT PEBB has been developed. The main new technologies to achieve higher powers are the new low-inductive gate-unit to maintain hardswitched operation up to more than 6000 A, the increased SOA of the 91 mm asymmetric IGCT (4 inch technology) and the antiparallel diode up to more than 6000 A and the active NPC technology, which allows an optimum and equal loss balancing in all power semiconductors. The maximum inverter output power has been increased by 80% with a parallel increase in the power density and reduced costs per kVA
    Power Electronics Specialists Conference, 2005. PESC '05. IEEE 36th; 02/2005
  • Source
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    ABSTRACT: In the field of power electronics the power electronics building block (PEBB) is a key functional component. With regard to the applications, it is of outmost importance that the PEBB technology used is compact, cost-effective and reliable. The IGCT is at the forefront of technology in high power, medium-voltage applications. For further improvement in size and costs a new ANPC IGCT PEBB has been developed. The main new technologies to achieve higher powers are the new low-inductive gate-unit to maintain hardswitched operation up to more than 6000 A, the increased SOA of the 91 mm asymmetric IGCT (4 inch technology) and the antiparallel diode up to more than 6000 A and the active NPC technology, which allows an optimum and equal loss balancing in all power semiconductors. The maximum inverter output power has been increased by 80% with a parallel increase in the power density and reduced costs per kVA
    Power Electronics and Applications, 2005 European Conference on; 01/2005
  • T. Bruckner, S. Bernet
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    ABSTRACT: This paper investigates the feasibility of a quasi-resonant DC-link soft-switching principle for voltage-source inverters (VSIs) in the megawatt power range. An evaluation of a three-level quasi-resonant DC-link VSI (3L-QRDCWSI) featuring integrated gate-commutated thyristors (IGCTs) and a comparison-to a commercially available three-level IGCT-VSI is presented. Extensive loss measurements of IGCTs under hard- and soft-switching conditions are the basis for the design and the comparison of the inverters. Aside from converter losses, other important aspects such as control, protection, and reliability are addressed
    IEEE Transactions on Industry Applications 04/2001; · 1.67 Impact Factor
  • T. Bruckner, S. Bemet
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    ABSTRACT: This paper investigates the use of active neutral point clamp switches in a three-level NPC voltage source inverter to balance the losses among the semiconductors. Both a control structure and algorithm are proposed which enable a substantially increased output power of the inverter and an improved performance at zero speed
    Power Electronics Specialists Conference, 2001. PESC. 2001 IEEE 32nd Annual; 02/2001
  • Source
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    ABSTRACT: This paper describes the series connection of integrated gate commutated thyristors (IGCTs) using RC-snubbers. An experimental setup with a power rating of 6 kV, 4 kA is used to analyze the dynamic and static behavior of the series connected IGCTs in detail. The mechanism of thermal stabilization of series connected IGCTs is discussed. It is shown that a good voltage balancing can be achieved by small RC-snubbers due to the fast switching IGCTs
    Industry Applications Conference, 2000. Conference Record of the 2000 IEEE; 02/2000
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    ABSTRACT: This paper describes the design of the series connection of integrated gate commutated thyristors (IGCTs) for a 6 kV drive using RC-snubbers. The dynamic and static voltage balancing is analysed in detail and experimental results are given. It is shown that a good voltage balancing can be achieved by small RC-snubbers due to the fast switching IGCTs
    PWM Medium Voltage Drives (Ref. No. 2000/063), IEE Seminar; 02/2000