Control and Protection of a Synergetically Controlled Two-Stage Boost-Buck PFC Rectifier System Under Irregular Grid Conditions

Li, Y.; Anderson, Jon Azurza; Schäfer, Jannik; Bortis, Dominik; Kolar, Johann W.; Everts, Jordi

doi:10.1109/ipemc-ecceasia48364.2020.9367872

Cited by 9 publications

(8 citation statements)

References 12 publications

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“…The result is that each power stage can be controlled individually, significantly simplifying the modulation schemes. In addition, no low-frequency filters are needed on the ac side; thus, the number of magnetic components is reduced and the overall system efficiency is improved [133], [135].…”

Section: Unfolding Quasi-single Stage I-afe Convertersmentioning

confidence: 99%

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Grid Integration of DC Buildings: Standards, Requirements and Power Converter Topologies

Carvalho

Blinov

Chub

et al. 2022

IEEE Open J. Power Electron.

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Residential dc microgrids and nanogrids are the emerging technology that is aimed to promote the transition to energy-efficient buildings and provide simple, highly flexible integration of renewables, storages, and loads. At the same time, the mass acceptance of dc buildings is slowed down by the relative immaturity of the dc technology, lack of standardization and general awareness about its potential. Additional efforts from multiple directions are necessary to promote this technology and increase its market attractiveness. In the near-term, it is highly likely that the dc buildings will be connected to the conventional ac distribution grid by a front-end ac-dc converter that provides all the necessary protection and desired functionality. At the same time, the corresponding requirements for this converter have not been yet consolidated. To address this, present paper focuses on various aspects of the integration of dc buildings and includes analysis of related standards, directives, operational and compatibility requirements as well as classification of voltage levels. In addition, power converter configurations and modulation methods are analyzed and compared. A classification of topologies that can provide the required functionality for the This article has been accepted for publication in IEEE Open Journal of Power Electronics.

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Section: Unfolding Quasi-single Stage I-afe Convertersmentioning

confidence: 99%

“…Due to the low losses and high-efficiency, the ac-dc stage can be implemented for high power levels mainly on the ac side. For the dc side, it is possible to divide the rated power between dc-dc submodules, increasing the overall system efficiency [131]- [133].…”

Section: Unfolding Quasi-single Stage I-afe Convertersmentioning

confidence: 99%

Grid Integration of DC Buildings: Standards, Requirements and Power Converter Topologies

Carvalho

Blinov

Chub

et al. 2022

IEEE Open J. Power Electron.

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“…This leads to a significant reduction of switching losses generated by the VSR-stage. 1/3-PWM has been analyzed mostly for 3-Φ two-stage systems with 2-L voltage DC-link front-ends [26]- [29], and [32]- [34] have described the operation of such systems, in the context of motor drive/photovoltaic inverter and EV charger applications, covering a wide output voltage range, i.e., with buck-boost functionality, emphasizing the advantages of 1/3-PWM for low output voltages and the seamless transition to 3/3-PWM for high output voltages.…”

Section: Introductionmentioning

confidence: 99%

Optimal Synergetic Control of High-Efficiency Three-Phase/Level Boost-Buck Voltage DC-Link Very Wide Output Voltage Range EV Charger

Zhang¹,

Leontaris²,

Huber³

et al. 2023

Preprint

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<p>Universal high-power three-phase mains interfaces for electric vehicle (EV) charging must provide a wide output voltage range (e.g., 200V to 800V) and thus provide buck and boost capability. An advantageous realization combining a three-level (3-L) T-type (Vienna) boost-type PFC voltage-source rectifier (VSR) with a 3-L buck-type DC/DC converter stage is presented in this paper. For high output voltages (boost-mode), the VSR-stage operates with 3/3-PWM, i.e., continuous PWM of all three phases to regulate the output voltage while the DC/DC-stage remains clamped to avoid switching losses. For low output voltages (buck-mode), the DC/DC-stage advantageously controls the DC-link voltage according to a time-varying reference value, which allows to sinusoidally shape the currents of two mains phases, such that the VSR-stage can operate with 1/3-PWM (only one of the three bridge-legs operates with PWM at any given time) with reduced switching losses. This paper proposes a novel 2/3-PWM scheme for the output voltage transition region, where output voltages are between the buck-mode and the boost-mode. This enables loss-optimum operation (i.e., the minimum number of the VSR-stage bridge-legs operating with PWM, and with the minimum possible DC-link voltage) for any output voltage. Furthermore, this paper introduces a new synergetic control concept that ensures seamless transitions between the loss-optimum operating modes. A comprehensive experimental verification, including pre-compliance EMI measurements, using a 10-kW hardware demonstrator with a power density of 5.4kW/L, a peak efficiency of 98.8% at rated power and 560V output voltage, and >98% efficiency for all operating points with >400V output voltage and more than about 50% of rated power, confirms the theoretical analyses.</p>

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“…To further improve the power density, several advanced modulation strategies have been studied for the front-end circuit of Fig. 1, where two-phases in the ac side are clamped, and no dc-link voltage control is needed, leading to a very small capacitance requirement in the dc-link [20]- [28]. Such a circuit with low dc-link capacitance is called three-phase quasi-two-stage buck-type rectifier in this paper.…”

mentioning

confidence: 99%

“…Two-stage three-phase dcac buck-boost converters with synergetically controlled twophase clamped DPWM are well-studied in [26], [27], in which a wider dc voltage can be achieved for the battery charger system. This converter functionality under regular and irregular grid conditions has been discussed in [28] as well. It is found that two-phase clamped DPWM can yield to the best switching loss reduction in any known DPWM strategies for the frontend ac-dc circuit, i.e., the ones described in [17], [29]- [32].…”

mentioning

confidence: 99%

A Carrier-Based Two-Phase-Clamped DPWM Strategy With Zero-Sequence Voltage Injection for Three-Phase Quasi-Two-Stage Buck-Type Rectifiers

Soeiro

et al. 2022

IEEE Trans. Power Electron.

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A three-phase buck-type rectifier features a stepdown ac-dc conversion function, which is considered as a prominent solution for electric vehicles chargers and telecommunication systems integrated to the grid above 380 V line-toline. However, traditional solutions for those applications employ cascaded architectures with an ac-dc Boost-type stage and a dc-dc Buck-type stage which may suffer from high switching losses and large dc-link capacitor volume. To relieve this issue, a straightforward carrier-based two-phase clamped DPWM strategy with generalized zero-sequence voltage injection is proposed in this work for the commonly employed cascaded circuit. This method can stop the switching actions in the front-end stage during twothirds of the grid period, which can yield to the best switching loss reduction. The operation of the front-and back-end converter stages become highly coupled to each other, which reduces the size requirement of capacitor in the dc-link. Therefore the equivalent circuit behaves as a quasi-two-stage buck-type rectifier allowing an enhancement of the system power density by improving power conversion efficiency and by reducing the volume of passive components and heatsink. The proposed carrier-based twophase clamped DPWM strategy is described, analyzed, validated, and compared with different PWM methods on PLECS based simulation and a 5 kW prototype.

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Control and Protection of a Synergetically Controlled Two-Stage Boost-Buck PFC Rectifier System Under Irregular Grid Conditions

Cited by 9 publications

References 12 publications

Grid Integration of DC Buildings: Standards, Requirements and Power Converter Topologies

Grid Integration of DC Buildings: Standards, Requirements and Power Converter Topologies

Optimal Synergetic Control of High-Efficiency Three-Phase/Level Boost-Buck Voltage DC-Link Very Wide Output Voltage Range EV Charger

A Carrier-Based Two-Phase-Clamped DPWM Strategy With Zero-Sequence Voltage Injection for Three-Phase Quasi-Two-Stage Buck-Type Rectifiers

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