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The advancements in wide-band-gap (WBG) devices are enabling applications of power electronics converters coupled directly to medium voltage and incorporating galvanic insulation within the converter using high-frequency solid-state transformers. This paper presents the design and the characterization results of a SiC H-bridge converter suitable for up to 100 kVA single-phase ac-dc modular solid-state...
Medium and high frequency converters are gaining increasing interest for high power applications such as renewable energy and dc grids. Medium and high frequency transformers are an essential component in such converters. Advancing resonant converters to higher power levels challenges the transformer design in multiple aspects including power levels, switching frequency, ac and dc voltages insulation...
This paper presents a novel single-stage AC/DC converter that can achieve high power factor with reduced switching losses for semiconductor devices. The topology is derived by integrating the interleaved boost-type PFC and full bridge LLC resonant converters. Due to interleaving at the input, the converter exhibits less input current ripple compared to the existing single stage topologies. Therefore,...
Shipboard power system is moving towards more insertion of medium voltage (MV) dc sub-system in the existing MVAC power system. Isolated bidirectional dc-dc converter, analogous to a dc energy router, is one of the key enabling components in such a MVDC system to inter-tie different dc buses with the capability of power flow control as well as fault isolation. Control of such converters in medium...
This paper presents a megawatt scale, medium voltage, medium frequency resonant dual active bridge dc-dc converter operating as a bus-tie converter in a dc distribution network. The high voltage side of the converter is designed using series connected low voltage devices in order to efficiently operate at higher switching frequencies. A combined variable frequency and phase shift control method is...
This paper presents a low-cost high-efficiency photovoltaic (PV) micro-inverter with soft-switching capability. The system is based on a partial power processing resonant front end dc-dc stage, followed by an interleaved inverter stage. The proposed new soft-switching modulation scheme enables significant cost and volume reduction of the magnetics in the inverter stage. In order to shrink the magnetics,...
In central inverter based photovoltaic (PV) plants, critical functions such as maximum power point tracking (MPPT) are performed on the aggregate I–V curve of all of the PV modules. The disadvantage of this approach is its inability to optimize overall output power when the operating conditions vary from one PV module to another, due to module differences (e.g. mismatch, layout, …) and shading effects...
With the steadily increasing penetration of residential and small commercial photovoltaic (PV) generation, interest has grown in utilizing this renewable generation source to support the power distribution grid, as clusters of residential solar have the potential to be used to provide reactive power support to the grid for voltage and frequency regulation through system level control and communication...
Micro-inverter based photovoltaic (PV) systems now represent about 8% of the U.S. residential market, and offer many advantages including safety, performance, and simplified installation. This paper presents a detailed trade-off study of micro-inverter circuit topologies. In addition to standard criteria of efficiency, reliability and cost, this study takes into account grid Volt/VAR support functions...
High energy yield has been and continues to be a major driver in PV installations. With the continuous improvement in PV modules' performance, there is a need to extract as much power as possible from the modules under various weather conditions. Over the past three years, we proposed, analyzed, built, installed, and monitored a PV system with string level MPPT dc/dc converters and a central inverter...
Photovoltaic architectures with distributed power electronics provide many advantages in terms of energy yield as well as system level optimization. As the power level of the solar farm increases it becomes more beneficial to increase the dc collection network voltage, which requires the use of power devices with higher voltage ratings, and thus making the design of efficient, low cost, distributed...
High voltage and high current SiC bipolar diode modules are fabricated and characterized under static and dynamic conditions. The modules are built using 6×6mm2 SiC chips that are fabricated on 3″ SiC substrates. Individual chips were also packaged in an ISOPLUS™ package and used to perform switching tests on the diodes. The modules have been fully characterized under static and dynamic conditions...
This paper presents a state space modeling approach for a single stage three level resonant power factor correction converter operating with variable frequency pulse width modulation control in discontinuous conduction mode. Modeling is achieved using a combined averaging and multiple-frequency approach. The model gives good prediction of both the transient and steady state operations of the converter...
This paper studies the performance of two control strategies applied to a new single-stage three-level resonant AC/DC converter. Two control techniques are studied in order to achieve : i) tightly regulate the output voltage, ii) input current shaping as well as iii) DC-bus voltage regulation over the whole input voltage and loading range. The two controllers are: a) variable frequency pulse width...
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