Γ-Z-source DC circuit breaker operation with variable coupling coefficient k

Al-khafaf, Haider; Asumadu, Johnson

doi:10.1109/eit.2017.8053411

Cited by 7 publications

(2 citation statements)

References 20 publications

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“…The fault current will only be supplied by the negative pole (i fn ) in case there is no terminal capacitor (C t ). Equation (28) describes the value of i fn .…”

Section: Positive Pole-to-ground Faultmentioning

confidence: 99%

“…Authors in references [7,9] proposed, analyzed, and simulated this circuit with a perfect coupling between these two coils of the breaker. In reference [28], the performance of the Γ shape source impedance breaker was stated under a variable coupling coefficient. The Z-source DC circuit breakers that were produced and designed in the previous work allow the DC current to flow in one direction.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Protection Scheme Based on Y-Source Circuit Breaker in Bi-Directional Zones for MVDC Micro-Grids

Al-khafaf

Asumadu

2021

Inventions

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A new bi-directional circuit breaker is presented for medium-voltage dc (MVDC) systems. The Y-source impedance network topology is used to implement the breaker. The current transfer function is derived to show the frequency response and the breaker operation with the high frequencies. Mathematical analysis is achieved with different conditions of coupling among the breaker inductors. The minimum level of the magnetic coupling is determined, which is represented by the null condition. The effect of the turns-ratio on this condition is investigated as well. The breaker is designed with two types of fault conductance slope rates. The Y-source breaker is simulated, and the results verify the breaker operation during the fault condition and the load change. The results also demonstrate the effect of the coupling level on the minimum values of the source current when the fault occurs. Based on the expected fault type in the MVDC systems, the proposed breaker is developed to interrupt the overcurrent due to any of these fault types. A protection scheme is proposed for a 12-bus, two-level micro-grid, where the Y-source breakers are used in the bi-directional zones. The results verify the ability of the breaker to conduct and interrupt the current in both directions of the power flow.

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“…The fault current will only be supplied by the negative pole (i fn ) in case there is no terminal capacitor (C t ). Equation (28) describes the value of i fn .…”

Section: Positive Pole-to-ground Faultmentioning

confidence: 99%