Four‐port solid‐state transformer based on hybrid MMC with enhanced dual half‐bridge submodules

Li, Dongye; Ji, Zhendong; Sun, Yifei; Zhao, Jianfeng; Zhang, Chi

doi:10.1049/iet-pel.2019.1304

Cited by 17 publications

(8 citation statements)

References 21 publications

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“…This loop can be designed based on the gyrator concept described in Al-Masri et al, 26 also considering that the power flow through the HFT is controlled using phase-shift modulation. For this purpose, it is necessary to consider the transfer function of the secondary current to the secondary voltage given by (19).…”

Section: Control Systemmentioning

confidence: 99%

Family of single‐phase high‐frequency isolated AC–AC converters

Filho

Tofoli

Barreto

et al. 2022

Circuit Theory & Apps

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This work presents a family of single‐phase ac–ac converters with high‐frequency isolation based on the association of interleaved transformers and the dual active bridge (DAB) converter. From distinct configurations of the dc link in terms of half‐bridge (HB), full‐bridge (FB), and interleaved full‐bridge (IFB) arrangements, one can obtain three symmetrical and six asymmetrical structures, with distinct trade‐offs among the number of active switches, total dc‐link voltage, and effective operating frequency of the filter elements. Prominent advantages of the derived circuits include input power factor correction (PFC), a nearly sinusoidal load voltage, the operation of active switches under soft‐switching condition during part of the line period, reduced current stresses, good current sharing due to the interleaved transformers, as well as multilevel voltage waveforms on both sides of the high‐frequency transformer (HFT). Experimental results obtained from an experimental prototype of an ac–ac FB‐IFB converter are presented to validate the theoretical assumptions.

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Section: Control Systemmentioning

confidence: 99%

Family of single‐phase high‐frequency isolated AC–AC converters

Filho

Tofoli

Barreto

et al. 2022

Circuit Theory & Apps

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show abstract

“…The charging process is completed at 0.65 s, and the LR PM is put into operational mode. After this step, the HV DC-link voltages of the remaining normal operational PMs and the GR PM decrease from 2100 to 1750 V. To suppress the fluctuations of LV DC-links voltage, the power from the isolation stage FIGURE 10 The FPMR process of EPT with HR scheme in CASE B is controlled to meet the load power demand. And the power quality of the output voltage is guaranteed.…”

Section: Case B: Assuming That the Third And Fifth Normal Operational...mentioning

confidence: 99%

“…In the medium-voltage (MV) fields, there are several competitive EPT topologies, such as the cascaded H-bridge (CHB) topology [5][6][7], the multilevel modular converter (MMC) topology [10,11], and the neutral-point clamped (NPC) topology [12]. The number of power modules (PMs) in each phase of MV EPTs varies from one to dozens, which is much smaller than that of the high-voltage (HV) power electronic equipment, such as MMC based on high-voltage direct current transmission (MMC-HVDC).…”

Section: Introductionmentioning

confidence: 99%

A hybrid redundancy scheme for medium‐voltage three‐phase cascaded H‐bridge electronic power transformer

Wang

Guan

Tian

et al. 2022

IET Power Electronics

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A hybrid redundancy (HR) scheme is proposed for the medium-voltage three-phase cascaded H-bridge electronic power transformer (CHB-EPT) based on the combination of the global redundant power modules and local redundant power modules. A "HOT-FIRST-LOCAL-FIRST" transition strategy is designed to achieve a short transition time. Furthermore, to reduce the power loss of the redundant power modules, an intermittent charging (IC) strategy is proposed for the hot-reserved redundant power modules. The detailed analysis of the topology shows that the proposed scheme can achieve low cost, high reliability, low power loss, and good transition performance. The performances are verified by simulations and experimental results.

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“…However, the H-bridge topology requires a relatively big DC-link electrolytic capacitor, which usually presents low reliability and low lifetime. Besides, in order to balance voltages of the capacitor divider, several voltage control strategies are investigated [12][13][14]. The need to balance and maintain near constant capacitor voltages is to limit the distortion of output voltages, as the input of the next stage is closely related to the output of the previous stage, that is, the performance of control strategies and PWM modulation in the next stage are dependent on the output performance of the previous stage.…”

Section: Introductionmentioning

confidence: 99%

Multiple modularity topology for smart transformers based on matrix converters

Zhang

Bento

Paraiso

et al. 2022

IET Electric Power Appl

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A novel matrix converter‐based topology to be applied in smart transformers (STs) is proposed, based on the concept of multiple modularity. To replace the conventional ST topology obtained by H‐bridge modules including DC electrolytic capacitors, the proposed ST topology uses two kinds of matrix modules to provide flexibility in the AC–AC structures to build complex ST. Fewer power semiconductor devices are used in each module to reduce the costs. The AC–AC matrix converters and the high‐frequency transformers eliminate electrolytic capacitors, enhancing ST reliability and power density. The modulation method for the proposed ST structure needs suited carrier waves and switching processes. The half‐Venturini modulation method shows several switching sequences leading to voltage imbalances in the input film capacitor divider. Therefore, the paper investigates and analyses the influence of switching sequences on the capacitor voltages in detail. The results show that the different switching sequences will cause different currents flowing into capacitors, leading to different results in capacitor voltages. Based on the analysis, proper modulations are recommended for the proposed topology. In order to verify the feasibility of the proposed topology as well as the correctness of the analysis on modulations, simulations and hardware‐in‐loop experiments are carried out. It is found that the modularity concept is feasible, and a suitable modulation sequence was developed to balance the input capacitors voltages.

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Four‐port solid‐state transformer based on hybrid MMC with enhanced dual half‐bridge submodules

Cited by 17 publications

References 21 publications

Family of single‐phase high‐frequency isolated AC–AC converters

Family of single‐phase high‐frequency isolated AC–AC converters

A hybrid redundancy scheme for medium‐voltage three‐phase cascaded H‐bridge electronic power transformer

Multiple modularity topology for smart transformers based on matrix converters

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