Analysis of the design space of single-stage and two-stage LC output filters of switched-mode AC power sources

Boillat, David O.; Friedli, Thomas; Mühlethaler, J.; Kolar, Johann W.; Hribernik, Wolfgang

doi:10.1109/peci.2012.6184594

Cited by 31 publications

(21 citation statements)

References 11 publications

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“…The carrier frequency for the PWM-based methods is f c = 48 kHz, the regular sampling frequency is 96 kHz and the sampling frequency for the MPC is f s = 150 kHz. The selection of the filter parameters is based on the concept shown in [6]. GeckoCIRCUITS was used to run the simulations.…”

Section: Comparative Resultsmentioning

confidence: 99%

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Comparative evaluation of control schemes for a high bandwidth three-phase AC source

Cortés

Boillat

Friedli

et al. 2012

Proceedings of the 7th International Power Electronics and Motion Control Conference

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This paper presents a comparative evaluation of a conventional cascaded PI-based control scheme (2 control loops with feedforward) with two different Model Predictive Control (MPC) schemes for a high performance AC source with 5 kHz -3 dB small-signal bandwidth. The prediction horizon of the MPC is 2. One of the MPC schemes considers direct selection of the switching states and the other one considers, in addition, the use of a modulation stage in order to obtain a constant switching frequency and to improve the steady-state output voltage behavior. The AC source considered in this work is based on a three-level T-Type converter with a two-stage LC output filter. The frequency characteristics of the system for the three control schemes are obtained, including reference tracking transfer function, output impedance and attenuation of DC-link voltage harmonics.

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Section: Comparative Resultsmentioning

confidence: 99%

“…The output of a three-level T-type converter feeds the load through a two-stage LC filter. The filter design and controller adjustment have been done under consideration of the system specifications regarding output voltage waveform quality and dynamics, as presented in [6]. The key specifications for the AC source are listed in Table I.…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of control schemes for a high bandwidth three-phase AC source

Cortés

Boillat

Friedli

et al. 2012

Proceedings of the 7th International Power Electronics and Motion Control Conference

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“…It calculates the semiconductor losses, PS C , n, and the respective junction temperatures for the assumed heat sink base plate temperature. With known semiconductor losses the heat sink can be optimized according to [14], which yields the total boxed volume of the cooling system, VCS , n, and the power demand of the fans, PCS , n' The values of the filter components are calculated according to [13] in order to fulfil the design specifications and design variables. The total losses and the boxed volumes of the DM and CM inductors (PLDM,n, PLCM,n, VLDM,n, VLCM , n) are calculated with the inductor optimization procedure detailed in Section IV , which employs an inductor model that considers electro-thermal and magneto thermal couplings.…”

Section: Th Ree-ph Ase Th Ree-level T-type Convertermentioning

confidence: 99%

η-ρ Pareto optimization of 3-phase 3-level T-type AC-DC-AC converter comprising Si and SiC hybrid power stage

Uemura

Krismer

Okuma

et al. 2014

2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)

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In this paper, the 7]-P (efficiency -power density) Pareto front of a 20kVA Uninterruptible Power Supply (UPS), comprising a Si and SiC hybrid 3-level T-type rectifier and inverter stage, and input! output side filters, is determind. A multi-objective optimization procedure is detailed, which em ploys an electrical converter model and coupled electro-thermal component models. Each component model determines the cor responding losses, volumes, and temperature rises. A detailed description of the inductor model is given which considers high frequency winding losses as well as core losses, and calculates the temperature rises inside the inductor, e.g. the hot-spot winding temperature. Based on the determined Tj-p Pareto front, the most suitable realization of the proposed UPS system is determined, which is based on the resulting sensitivities of the design param eters (switching frequency, current ripples, magnetic materials, etc.) on the performance of power converter system (efficiency and power density). As a result, a switching frequency of 16 kHz, maximum relative input and output side current ripples of 20 %, amorphous core materials for DM inductors, and nanocrystalline core materials for CM inductors are selected in order to achieve a converter efficiency of 96.6 % at a power density of 2.3 kVA/dm 3 •

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“…The passive components -especially the inductor -of the filter stage dominate the size and weight of these power converters [5,6]. To minimize the required inductance and shrink the filter inductor, the switching frequency of the bridgeleg can be increased at the expense of higher switching losses and lower efficiency.…”

Section: Introductionmentioning

confidence: 99%

Novel ZVS S-TCM Modulation of Three-Phase AC/DC Converters

Haider

Anderson

Mirić

et al. 2020

IEEE Open J. Power Electron.

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For three-phase AC-DC power conversion, the widely-used continuous current mode (CCM) modulation scheme results in relatively high semiconductor losses from hardswitching each device during half of the mains cycle. Triangular current mode (TCM) modulation, where the inductor current reverses polarity before turn-off, achieves zero-voltage-switching (ZVS) but at the expense of a wide switching frequency variation (15× for the three-phase design considered here), complicating filter design and compliance with EMI regulations. In this paper, we propose a new modulation scheme, sinusoidal triangular current mode (S-TCM), that achieves soft-switching, keeps the maximum switching frequency below the 150 kHz EMI regulatory band, and limits the switching frequency variation to only 3×. Under S-TCM, three specific modulation schemes are analyzed, and a loss-optimized weighting of the current bands across load is identified. The 2.2 kW S-TCM phase-leg hardware demonstrator achieves 99.7 % semiconductor efficiency, with the semiconductor losses accurately analytically estimated within 10 % (0.3 W). Relative to a CCM design, the required filter inductance is 6× lower, the inductor volume is 37 % smaller, and the semiconductor losses are 55 % smaller for a simultaneous improvement in power density and efficiency.

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Analysis of the design space of single-stage and two-stage LC output filters of switched-mode AC power sources

Cited by 31 publications

References 11 publications

Comparative evaluation of control schemes for a high bandwidth three-phase AC source

Comparative evaluation of control schemes for a high bandwidth three-phase AC source

η-ρ Pareto optimization of 3-phase 3-level T-type AC-DC-AC converter comprising Si and SiC hybrid power stage

Novel ZVS S-TCM Modulation of Three-Phase AC/DC Converters

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Analysis of the design space of single-stage and two-stage LC output filters of switched-mode AC power sources

Cited by 31 publications

References 11 publications

Comparative evaluation of control schemes for a high bandwidth three-phase AC source

Comparative evaluation of control schemes for a high bandwidth three-phase AC source

&#x03B7;-&#x03C1; Pareto optimization of 3-phase 3-level T-type AC-DC-AC converter comprising Si and SiC hybrid power stage

Novel ZVS S-TCM Modulation of Three-Phase AC/DC Converters

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η-ρ Pareto optimization of 3-phase 3-level T-type AC-DC-AC converter comprising Si and SiC hybrid power stage