Scalable Solid-State Bus-Tie Switch for Flexible Shipboard Power Systems

Abstract

The need to increase efficiency and reduce operating cost of shipboard DC power distribution networks results in a desire to increase the operating voltage of such installations to the medium voltage levels. Devices such as solid state bus-tie switches are an essential component of such systems, as they allow for system reconfigurations and prevent fault propagation across different sections of the system. This paper presents a scalable solid state bus-tie switch topology designed initially for low voltage power distribution networks, but easily scalable in terms of voltage and current. The use of a single active device greatly increases simplicity and reliability of the solution. The ability to extend the current and voltage ratings has been verified on the prototypes through extensive experimental tests in parallel and series connection, respectively. Several methods for fault detection are discussed and further verified experimentally.

Solid-State Technology for Shipboard DC Power Distribution Networks

“…14 highlights this by displaying the L didt current during the initial and final pulses of the charging of a 2.3 mF capacitance with I OF F = 100 A and I ON = 75 A. This is part of the expected operation of the SSBTS prototype as was shown in [10], [18]. Note also that the exceeding of the current threshold does not take place for I ON , the lower current threshold.…”

“…A recently developed and demonstrated SSBTS unit is analysed in this paper for the additional soft-start function it can provide to the displayed scaled-down shipboard DC PDN model. Since the primary function of this device is ensuring the protection of the system, no alterations are made to the SSBTS design rules provided in [10], [18]. The additional soft-start functionality is achieved solely through the implementation of additional control schemes.…”

State-of-the-Art Review on Shipboard Microgrids: Architecture, Control, Management, Protection, and Future Perspectives

“…The system's dynamic is not investigated [215] Presents fault detection and isolation based on nonintrusive load monitoring (NILM) Fault reconfiguration is not investigated [216] Presents a fault diagnosis method based on the wavelet-based filtering approach Minimizes the probability of misdetection Fault reconfiguration is not investigated [217] Presents a scalable solid-state bus-tie Switch that can be easily scaled for current and voltage Investigates fault-detection methods Reduces the electrical and thermal stresses by using multiple units rather than a single unit Fault localization and reconfiguration are not investigated [218] Presents a new solid-state bus-tie switch (SSBTS) Parallel connecting multiple units of the topology to increase power and voltage ratings Fault localization and reconfiguration are not investigated [219] Presents a solid-state DC circuit breaker Detects and isolates the fault in significantly less time Fault reconfiguration is not investigated [220] Explores three different protection schemes for DC faults in SBMGs, namely, a six-pulse thyristor rectifier, a six-pulse diode rectifier, and a two-level active rectifier Fault reconfiguration is not investigated [221] Presents a fault-detection algorithm based on overcurrent Recloses the Z-source breaker after the fault if necessary by control Integrates Z-source DC circuit breakers into a zonal MVDC SBMG Provides solutions for two Z-source breakers to work in parallel and supply current for Fault localization is not detected Table 8. Comparison of the contributions and issues of the most recent research related to faultmanagement techniques [213][214][215][216][217][218][219][220][221][222][223].…”

Improving Energy Efficiency in DC Microgrids with Integrated Energy Storage

“…A solid-state BTS, available in the laboratory, is integrated into the microgrids. The BTS has a topology of a four-quadrant switch configuration with one IGBT module and a current limiting reactor [5,6]. With this topology, the BTS allows for bi-directional power flows and ultra-fast current interruption (several tens of microseconds) [5].…”