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Showing 1 to 13 of 13 for “"MVDC"”.
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The Impact of Electrical Standards on MVDC Shipboard Power Cable Size
… interest in medium voltage direct current (MVDC) power systems for several reasons, including compatibility with DC loads, reduction of induced currents and magnetic signatures, and avoidance of alternating current (AC) frequency synchronization issues when combining outputs from multiple …
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Shipboard MVDC Voltage Stabilization by Negative Load Energy Storage Compensated Virtual Capacitance
Shipboard MVDC power systems need to support pulsed loads, which have destabilizing ef-fects on the MVDC power transmission bus voltage. Despite the reference shipboard MVDC architecture having energy storage to buffer the large power swings of pulsed loads, a large constant power still needs to be …
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Hybrid Modular Multilevel Converter Family and Modular DC Circuit Breaker for Medium-voltage DC (MVDC) Applications
… efficiency, and flexibility. Medium-voltage DC (MVDC) applications, including shipboard, railway systems, distribution networks, and microgrids, are emerging as critical areas of interest. To integrate MVDC systems with existing power grids, MV AC/DC conversion techniques are crucial. Moreover, …
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A novel backup protection scheme for hybrid AC/DC power systems
… DC faults that are not cleared by the main MVDC (Medium Voltage DC) link protection. The protection scheme relies on the apparent impedance measured at the AC "side" of the MVDC link to detect faults on the DC system. It can be readily implemented on existing distance protection relays with …
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DC to DC power conversion module for the all-electric ship
… model. The focus was on the Medium Voltage DC (MVDC) architecture, and therefore, the PCM-4 converts a MVDC bus voltage of 3.3, 6.5 or 10 kVDC to 1 kVDC. The design describes the transient and steady-state behavior, and investigates the naval architecture characteristics. A modular architecture, …
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Z-source circuit breakers in naval power systems
… move to medium voltage direct current power (MVDC) systems on future vessels. Integrating the z-source circuit breaker into a "typical" naval MVDC power system requires understanding system dynamics that may cause the circuit breaker to inadvertently energize a circuit through regenerative …
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DC Fault Current Analysis and Control for Modular Multilevel Converters
… power by the loads. The Medium-Voltage DC (MVDC) concept can be an optimal solution. On the other hand, the Modular Multilevel Converter (MMC) is an attractive converter topology choice, as it has advantages such as excellent harmonic performance, distributed energy storage, and near ideal …
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Modeling and simulation of an all electric ship in random seas
… of the performance and stability of the Purdue MVDC Testbed, a scaled IPS composed of analagous elements: electric machinery, power converters, MVDC distribution, and bus voltage/induction motor torque control schemes. The thesis details the applicable nonlinear equations and the tools for …
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Modelling and real-time simulation of a modular bidirectional solid-state transformer for ultra-fast charging of electric vehicles
… to incorporate energy storage systems at the MVDC-link. This topological configuration allows bi-directional power flow for Vehicle-to-Grid and for scalability to higher voltage and power levels. A detailed model-based design of a multi-module SST is presented with 3.3 kV SiC MOSFETs for …
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Shipboard condition based maintenance and integrated power system initiatives
… propulsion drive system were constructed, an MVDC propulsion simulation and a doubly-fed machine propulsion model. These simulations were built for the purpose of testing innovative integrated propulsion system theories, algorithms, configurations and new electric propulsion concepts.
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Device Voltage Balancing from Device-level to Converter-level in High Power Density Medium Voltage Converter using 10 kV SiC MOSFETs
… electronic energy network architectures, like MVDC power delivery, underground solid-state power substation (SSPS), and high-density power electronics building block (PEBB); help drive the levelized cost of electricity (LCOE) of renewable energy on par with conventional power generation; …
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Modular Photovoltaic (PV) Step-up Converter With A Coupled Power Balancing Scheme for DC-Distributed System
… connect multiple PV energy sources to the MVDC grid, modular structure of PV power converter is used to convert and maximize the capture of PV energy. The converter consists of external power balancing units to ensure equal power distribution and safe operation amongst all the converter …
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Multiport Energy Router based Integration of Renewable Energy Sources for Offshore Grid
… cables. Furthermore, integrating RES via HVDC or MVDC systems requires voltage regulation without reactive power compensation. However, a DC microgrid with several power sources needs a proper architectural design. To address this issue, the dissertation proposes an HVDC offshore architecture that …