The Solid State Transformer (SST) is one of the key elements proposed in National Science Foundation (NSF) Generation-III Engineering Research Center (ERC) ¿Future Renewable Electric Energy Delivery and Management¿ (FREEDM) Systems Center. SST used to enable active management distributed renewable energy resources, storage devices loads. In this paper, Generation-I single-phase 20 kVA, based on 6.5 kV Si-IGBT for interface with 12 distribution system voltage. design parameters, overall...

This paper presents predictive current-mode control for a single-phase high-frequency transformer-isolated dual-active bridge dc-to-dc converter. The algorithm increases the bandwidth of current loop converter which enables tracking reference within one switching cycle. further demonstrates that application can remove transient dc offset from in isolation transformer Direct protects saturation even at conditions. has been implemented on an experimental setup and tests have performed to...

This paper presents the design and hardware implementation testing of 20kVA Gen-1 silicon based solid state transformer (SST), high input voltage isolation requirement are two major concerns for SST design. So a 6.5kV 25A dual IGBT module has been customized packaged specially this low current application, an optically coupled sensor gate driver designed in order to fulfill requirement. also discusses auxiliary power supply structure thermal management stage.

Basic power topology for a Solid State Transformer (SST) with new 15 kV SiC IGBT devices is discussed. It difficult to build high efficient, light weight, magnetically isolated solid state transformer voltage (13.8 kV) grid connectivity existing Si 6.5 rated IGBTs and diodes. Existing of the art (6.5 kV), speed (IGBT) cause considerable amount loss (switching conduction loss). With advent these limitations are largely mitigated this provides motivation topologies. The targeted efficiency...

In this paper, a 20 kVA Solid State Transformer (SST) based on 6.5 kV IGBT is proposed for interface with 7.2 distribution system voltage. The SST consists of cascaded multilevel AC/DC rectifier stage, Dual Active Bridge (DAB) converter stage high frequency transformers and DC/AC inverter stage. Based the single phase d-q vector control, novel control strategy to balance capacitor voltages real power through DAB parallel modules. Furthermore, constraints voltage are analyzed. switching model...

The three-phase Solid State Transformer (SST) is one of the key elements in Future Renewable Electric Energy Delivery and Management (FREEDM) System. SST consists an input rectifier, Dual Active Bridge (DAB) bidirectional dc-dc converter followed by inverter for ac voltage output. DAB a using high frequency transformers to step up or down voltages at reduction size while maintaining efficiency reliability. single phase high-frequency high-voltage transformer two-level has been reported...

Silicon carbide (SiC) is more favorable than (Si) to build high voltage devices due its wider band-gap and higher critical field strength. Especially, the SiC MOSFETs are finding their niche in 1 kV range, which currently dominated by Si IGBTs. This paper aims at demonstrating power frequency operation of MOSFETs, as a means evaluate feasibility using for density applications. The sample chosen this study 1200 V, 20 A, co-packed with 10 A JBS diodes - manufactured CREE Inc. dual active...

The Dual Active Bridge (DAB) bidirectional dc to converter has gained a significant popularity in high voltage, power due its several topological advantages. Due non-ideal switching characteristics and delays gating, DC bias may be generated the frequency transformer leading increased loses eventually saturation failure of switches. This paper proposes simple way measure flux using primary secondary winding current. A duty cycle modulation bridge is proposed eliminate lower topologies....

In this paper a novel predictive algorithm has been proposed for bi-directional dc-dc converters with high frequency transformer isolation. The converter is dual active bridge converter. faster alternative to the classical PI based phase shift controller. This mode of control can remove dc bias in isolation within several switching cycles hence preventing saturation. Aspects have implemented on hardware test bed and verified.

Modern electric ships utilize a medium-voltage zonal dc distribution system to meet the ever increasing power demand while keeping density as low possible. Power electronics building blocks (PEBBs) composed of different DC/AC and DC/DC converters are used convert main DC bus voltage appropriate ac levels suited for loads in such system. Due fact that most these electronic present constant load (CPL) with negative incremental impedance at input terminal, interaction under configurations AC-DC...

In this paper, high-frequency (HF) three-phase dual active bridge (DAB) dc/dc converter in wye-delta connection is characterized and the optimal condition efficiency size of practical application investigated. The proposed topology has many advantages, such as linear operation wide range full ZVS region which have been major restrictions existing single-phase DAB applications. This new approach applied to a 10kW prototype with multiple outputs mitigate switching losses using newly introduced...

In this digest a review of various current control strategies in bidirectional isolated DC to converter is shown. Average control, peak and predictive proposed for the single phase topology. A comparison between controllers shown with simulation results experimental verification.

The Solid State Transformer (SST) enables intelligent integration of renewable resources with the grid. rectifier, grid tie inverter and black start modes SST operation are discussed in this paper. A previous study [3], did a preliminary investigation capabilities SST. This paper further investigates control structures validates them through PSCAD simulations experimental results.

The latest technological advances in battery and converter technology, along with government mandates on energy independence resilience, are expected to pave the way for higher deployment of plug-in electric vehicles (PEV) transportation fleet. These vehicles, when equipped bidirectional transfer capabilities, can function as mobile resources be utilized a Vehicle-to-Grid (V2G) scheme order temporarily inject back into power grid, thereby functioning storage systems. forecasted increase...

In this paper a predictive observer model for power semiconductor devices is developed and integrated in the digital controller. The Model simulated Mat lab Simulink tested with converter hardware accuracy of modeling.

This paper demonstrates the black start capabilities of a single phase 20kVA solid state transformer (SST), specifically for microgrid power restoration during islanding. SST's have many benefits including better management renewable energy resources and more intelligent control than classical which acts only as passive device. An additional benefit SST that is demonstrated in this ability to use these directly connected restore load an islanding event. During procedure can switch operation...

In this paper an alternate to the DC stage of a single phase solid state transformer is proposed comprising Multi limb core (MLC) transformer. Further two important operation conditions (SST) with cascaded series connected converter topology studied: soft startup from auxiliary source avoid any inrush current on capacitors and control interaction between converters under severe voltage sag. The balance in structure extreme sag primary concern solution proposed.

An important functionality of the Solid State Transformer (SST) is integration renewable energy sources within topology itself, acting as a hub. Due to fluctuating nature source, such becomes challenge and storage requirement. In this paper variant single phase SST with multi limb magnetic core proposed which directly integrates source in high frequency stage uses grid buffer eliminating requirement storage.

The following paper details out a converter topology which can act as an accumulator of power from different renewable energy sources (RES). Due to the intermittent nature availability RES DC buses are assumed unregulated. proposed decouples individual voltage and reduces unwanted circulation reactive between busses due mismatch in levels, at same time accumulates produces regulated output. magnetic design transformer core has been shown verified with hardware experimental results.

Resolvers are commonly used to measure the rotor position in motor drive applications. However, manufacturing imperfections introduce a measurement error, which manifests itself as relatively small oscillations primarily at fundamental and second harmonic frequencies of resolver true electrical position. This affects field orientation control machines, leading currents electromagnetic torque. paper focuses on impact error series-hybrid drivetrain architecture. In this topology, substantial...

In this digest an overload predicting algorithm is proposed based on the converter operating point and thermal model of a 6.5 KV Silicon IGBT module. This can predict both time interval for hence be used cycle performance evaluation converters.