Solid-state transformer

A solid-state transformer (SST), power electronic transformer (PET), or electronic power transformer is actually an AC-to-AC converter, a type of electric power converter that replaces a conventional transformer used in AC electric power distribution. It is more complex than a conventional transformer operating at utility frequency, but it can be smaller and more efficient than a conventional transformer because it operates at high frequency. The main types are "true" AC-to-AC converter (with no DC stages) and AC-to-DC-to-DC-to-AC converter (in which an active rectifier supplies power to a DC-to-DC converter, which supplies power to a power inverter). A solid-state transformer usually contains a transformer, inside the AC-to-AC converter or DC-to-DC converter, which provides electrical isolation and carries the full power; this transformer is much smaller because it operates at high frequency. A solid-state transformer can actively regulate voltage and current. Some can convert single-phase power to three-phase power and vice-versa. Variations can input or output DC power to reduce the number of conversions, for greater end-to-end efficiency. As a complex electronic circuit, it must be designed to withstand lightning and other surges. Solid-state transformer is an emerging technology.

References

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Transformer
Types	Amorphous metal transformer Austin transformer Autotransformer Buck–boost transformer Capacitor voltage transformer Current transformer Distribution transformer Delta-wye transformer Energy efficient transformer Flyback transformer Grounding transformer Instrument transformer Isolation transformer Dry isolation transformer Linear variable differential transformer Modulation transformer Neon-sign transformer Padmount transformer Paraformer Planar transformers Rotary transformer Rotary variable differential transformer Scott-T transformer Solid-state transformer Trigger transformer Variable-frequency transformer Zigzag transformer
Coils	Hybrid coil Induction coil Oudin coil Polyphase coil Repeating coil Tesla coil Trembler coil
Topics	Agbioeletric Balun Buchholz relay Bushing Center tap Circle diagram Condition monitoring of transformers Copper loss Dissolved gas analysis Electrical insulation paper Growler High-leg delta Induction regulator Leakage inductance Magnet wire Metadyne Open-circuit test Polarity Polychlorinated biphenyl Quadrature booster Resolver Resonant inductive coupling Severity factor Short-circuit test Stacking factor Synchro Tap changer Toroidal inductors and transformers Transformer oil Transformer oil testing Transformer utilization factor Vector group
Manufacturers	ABB Prolec GE Siemens TBEA