Title: Low modulation index 3-phase solid state transformer

Abstract

A solid-state transformer (SST) comprises a transformer core, a primary winding, a secondary winding, a primary-side switch bank, and a secondary-side switch bank. Each of the switch banks includes six 4-quadrant switches. The twelve 4-quadrant switches are toggled on and off over six clock cycles in a repetitive sequence with a period that is a function of a desired operating frequency of the transformer. The sequence is configured such that at any given time, 2 of 3 input and output phases are connected to the primary and secondary windings. The SST further includes L-C filter circuits that are configured to filter high-frequency components of current and voltage waveforms such that these components are not back-fed to the electrical mains or delivered to a load. The SST includes a primary-side filter circuit and a secondary-side filter circuit that can each include respective L-C filters for three input or output phases.

Inventors:

Koplow, Jeffrey P.

Issue Date:

2021-10-19

Research Org.:

Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1859983

Patent Number(s):

11152918

Application Number:

17/071,009

Assignee:

National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM)

Patent Classifications (CPCs):

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS

H - ELECTRICITY H02 - GENERATION H02M - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS

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H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS

H01F27/28 - Coils
H01F27/42 - Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils

H - ELECTRICITY H02 - GENERATION H02M - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS

H02M5/10 - using transformers
H02M5/225 - {comprising two stages of AC-AC conversion, e.g. having a high frequency intermediate link}

H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03K - PULSE TECHNIQUE

H03K17/687 - the devices being field-effect transistors
H03K3/012 - Modifications of generator to improve response time or to decrease power consumption

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DOE Contract Number:  

NA0003525

Resource Type:

Patent

Resource Relation:

Patent File Date: 10/15/2020

Country of Publication:

United States

Language:

English