A Hybrid DC Circuit Breaker Combining a Multilevel Converter and Mechanical Contactors: Verification of the Principles of Operation by Experiment and Simulation

Oishi, Masamichi; Suzuki, Atsushi; Hagiwara, Makoto; Akagi, Hirofumi

doi:10.1541/ieejias.136.595

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…In the gradient driver, reactive power supplied in excitation period because of inductive load is recovered in demagnetization period. In Reference, 14 loss energy in experimental system is found from change in electrostatic energy on the assumption that power flow from charging circuit is zero. In these experiments, too, initial charging was performed to ensure zero power flow, and then power supply of the charging circuit was turned off.…”

Section: Experimental Verification Of Lossesmentioning

confidence: 99%

A proposal of a new gradient driver with a gradational voltage inverter for low power loss

Oishi

Kobayashi

Sakashita

2022

Electrical Engineering Japan

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This paper proposes a new gradient driver with a gradational voltage inverter for low power loss and downsized filter circuits. Gradient drivers produce direct current with low ripple amplitudes to achieve high image quality and high slew rates to obtain images rapidly. The proposed gradient driver is characterized by low ripple amplitude of the output current from the inverter composed of SiC‐MOSFETs and high output voltage from another inverter composed of IGBTs. This paper discusses both the principle of operation and control method of the new gradient driver. Experimental verification is performed on a full‐scale system. The results show the advantages of the proposed gradient driver based on loss analysis by calculations.

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Section: Experimental Verification Of Lossesmentioning

confidence: 99%

A proposal of a new gradient driver with a gradational voltage inverter for low power loss

Oishi

Kobayashi

Sakashita

2022

Electrical Engineering Japan

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“…This scheme can remove faults fast, but this scheme can be applied only in HVDC systems. Moreover, a hybrid DC CB proposed in [84] consists of reactors for current limiting, mechanical contactor, and a converter. This method is fast for LVDC and can be applied to the higher voltages, and also the steady state loss of this method is zero.…”

Section: Microgrid Pdsmentioning

confidence: 99%

Protection in DC microgrids: a comparative review

2018

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A direct current (DC) microgrid has become a superior power system in recent years due to the development of DC loads and higher efficiency of DC systems. One of the challenging problems on DC microgrids operation is protection, and it is still a particular concern associated with the challenges of developing a proper protection scheme owing to its characteristics and lack of standards in DC protection. Due to the significant increasing interest on DC microgrid; this study investigates protection problems and schemes that need to be addressed in modern power systems involving DC microgrids. This study analyses and presents a comprehensive review of the most recent growth in the DC microgrids protection. Additionally, the fault characteristics of DC microgrids, the impact of constant power loads, the protection devices and several proposed methods to overcome the protection problems are discussed. The differences between the proposed protection methods for the DC microgrids are also discussed.

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A bi-directional current-limiting hybrid DC circuit breaker with fast-breaking capability

Shu,

Shao

2024

Electric Power Systems Research

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A Hybrid DC Circuit Breaker Combining a Multilevel Converter and Mechanical Contactors: Verification of the Principles of Operation by Experiment and Simulation

Cited by 7 publications

References 14 publications

A proposal of a new gradient driver with a gradational voltage inverter for low power loss

A proposal of a new gradient driver with a gradational voltage inverter for low power loss

Protection in DC microgrids: a comparative review

A bi-directional current-limiting hybrid DC circuit breaker with fast-breaking capability

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