A Rotational Control in Medium-Voltage Modular Solid-State Transformer-Based Converter System

Journal Article · Mon Aug 05 00:00:00 EDT 2019 · IEEE Transactions on Industry Applications

DOI:https://doi.org/10.1109/tia.2019.2932958· OSTI ID:1799280

Dong, Dong ^[1]; Raju, Ravisekhar ^[2]; Ganireddy, Govardhan ^[3]; Agamy, Mohammed ^[4]

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1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); State Univ. of New York (SUNY), Albany, NY (United States)
2. GE Global Research Center, Niskayuna, NY (United States)
3. GE Renewable Energy, Salem, VA (United States)
4. State Univ. of New York (SUNY), Albany, NY (United States)

This article presents a novel control strategy to significantly reduce the high-frequency transformer loss in a modular solid-state transformer (SST) based converter system. The modular SST design is based on an ac-dc power-electronic building block comprised of an H-bridge at the ac input and a bidirectional soft-switching isolated dc-dc converter with a medium-voltage insulated high-frequency transformer. The ac terminals of input H-bridges are connected in series and directly coupled to the medium-voltage ac line, while the output dc terminals are all connected in parallel at a low voltage. The key innovation described in this paper, without sacrificing the output performance, is the control scheme that reduces core and winding losses associated with the dc-dc resonant stage by turning off the selected dc-dc converters in synchronism with the line voltage. The prototype for the test described in this paper is based on a modular SST where each module is rated at 50 kVA, with a 200 kHz transformer using 1.7 kV silicon carbide discrete mosfets, but the described control concepts are more broadly applicable to similar topologies.

• Research Organization: GE Global Research Center, Niskayuna, NY (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
• Grant/Contract Number: EE0007252
• OSTI ID: 1799280
• Journal Information: IEEE Transactions on Industry Applications, Journal Name: IEEE Transactions on Industry Applications Journal Issue: 6 Vol. 55; ISSN 0093-9994
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
Drives
Field programmable gate arrays
Oil insulation
Power transformer insulation
Pulse width modulation
Silicon carbide (SiC) mosfets
Soft-switching
Solid-state transformer (SST)
Switches
Windings