Journal ArticleDOI
Modified Z-Source DC Circuit Breaker Topologies
TLDR
In this paper, a modified Z-source dc circuit breaker is introduced for the operation at medium-voltage dc with future applications in naval ship power systems, which limits capacitor current in the circuit and can be easily modified for fault detection.Abstract:
The Z-source dc circuit breaker has been introduced as a new circuit for quickly and automatically switching off in response to faults. A modified Z-source breaker design is introduced for the operation at medium-voltage dc with future applications in naval ship power systems. Compared to existing designs, the respective design will allow for greater control of step changes in load. This new design also limits capacitor current in the circuit and can be easily modified for fault detection. Analysis of the breaker operation is presented during both the fault and step changes in load. Low-voltage laboratory validation of the breaker was carried out on two different versions of the proposed circuit.read more
Citations
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Journal ArticleDOI
Analysis and Design of DC System Protection Using Z-Source Circuit Breaker
TL;DR: In this paper, a modified Z-source breaker topology is introduced to minimize the reflected fault current drawn from a source while retaining a common return ground path, analogous in some respects to a thermal-magnetic breaker.
Journal ArticleDOI
Modular Multilevel High-Frequency-Link DC Transformer Based on Dual Active Phase-Shift Principle for Medium-Voltage DC Power Distribution Application
TL;DR: In this paper, a multilevel high-frequency-link dc transformer (MDCT) based on dual active phase-shift principle for medium-voltage dc (MVDC) power distribution application is proposed.
Journal ArticleDOI
Multiport Hybrid HVDC Circuit Breaker
TL;DR: The operation principles of the proposed multiport dc circuit breaker are introduced, analyzed, and compared to the existing solution in this work.
Journal ArticleDOI
A Z-Source-Based Bidirectional DC Circuit Breaker With Fault Current Limitation and Interruption Capabilities
TL;DR: In this paper, an efficient dc bidirectional fault current limiter and interrupter (FCLI) based on Z-source topology is proposed to overcome some of the challenges in dc microgrids.
Journal ArticleDOI
Fault Detection and Isolation in Medium-Voltage DC Microgrids: Coordination Between Supply Power Converters and Bus Contactors
Pietro Cairoli,Roger A. Dougal +1 more
TL;DR: In this article, a fast and effective method for detecting and isolating faults in medium-voltage dc microgrids relies on rapid coordination between power supply converters and bus segmentizing contactors to limit currents and isolate faults without any need for fast communication between these active elements.
References
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Journal ArticleDOI
Z-source inverter
TL;DR: The Z-source converter employs a unique impedance network to couple the converter main circuit to the power source, thus providing unique features that cannot be obtained in the traditional voltage-source (or voltage-fed) and current-source converters where a capacitor and inductor are used, respectively.
Journal ArticleDOI
Protection of Low-Voltage DC Microgrids
TL;DR: In this paper, a low-voltage (LV) DC microgrid protection system design is proposed and the operating principles and technical data of LV DC protection devices, both available and in the research stage, are presented.
Journal ArticleDOI
Switched Inductor Z-Source Inverter
Miao Zhu,Kun Yu,Fang Lin Luo +2 more
TL;DR: In this paper, a switched inductor (SL) Z-source inverter is proposed to enlarge voltage adjustability, which employs a unique SL impedance network to couple the main circuit and the power source.
Journal ArticleDOI
Quasi Two-Level Operation of Modular Multilevel Converter for Use in a High-Power DC Transformer With DC Fault Isolation Capability
I. A. Gowaid,Grain Philip Adam,Ahmed Massoud,Shehab Ahmed,Derrick Holliday,Barry W. Williams +5 more
TL;DR: In this paper, a quasi two-level operating mode of the modular multilevel converter is proposed, where the converter generates a square wave with controllable dv/dt by employing the cell voltages to create transient intermediate voltage levels.
Journal ArticleDOI
Fault Detection and Isolation in Low-Voltage DC-Bus Microgrid System
Jae-Do Park,Jared Candelaria +1 more
TL;DR: In this paper, a fault detection and isolation scheme for lowvoltage dc-bus microgrid systems is presented, which consists of master and slave controllers that monitor currents and control the segment separation, which include solid-state bidirectional switches and snubber circuits.