Title page for ETD etd-08312000-16220053


Type of Document Master's Thesis
Author Superczynski, Matthew J.
Author's Email Address msupercz@vt.edu
URN etd-08312000-16220053
Title Analysis of the Power Conditioning System for a Superconducting Magnetic Energy Storage Unit
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Boroyevich, Dushan Committee Chair
Huang, Alex Q. Committee Member
Lee, Fred C. Committee Member
Keywords
  • Superconductivity
  • Naval
  • Chopper Voltage source inverter
  • Magnetic energy storage
  • SMES
  • Power Electronics
Date of Defense 2000-07-24
Availability unrestricted
Abstract
ABSTRACT

Superconducting Magnetic Energy Storage (SMES) has branched out from its application origins of load leveling, in the early 1970s, to include power quality for utility, industrial, commercial and military applications. It has also shown promise as a power supply for pulsed loads such as electric guns and electromagnetic aircraft launchers (EMAL) as well as for vital loads when power distribution systems are temporarily down. These new applications demand more efficient and compact high performance power electronics.

A 250 kW Power Conditioning System (PCS), consisting of a voltage source converter (VSC) and bi-directional two-quadrant DC/DC converter (chopper), was developed at the Center for Power Electronics Systems (CPES) under an ONR funded program. The project was to develop advanced power electronic techniques for SMES Naval applications. This thesis focuses on system analysis and development of a demonstration test plan to illustrate the SMES systems' ability to be multitasked for implementation on naval ships. The demonstration focuses on three applications; power quality, pulsed power and vital loads.

An integrated system controller, based on an Altera programmable logic device, was developed to coordinate charge/discharge transitions. The system controller integrated the chopper and VSC controller, configured applicable loads, and dictated sequencing of events during mode transitions.

Initial tests with a SMES coil resulted in problems during mode transitions. These problems caused uncontrollable transients and caused protection to trigger and processors to shut down. Accurate models of both the Chopper and VSC were developed and an analysis of these mode transition transients was conducted. Solutions were proposed, simulated and implemented in hardware. Successful operation of the system was achieved and verified with both a low temperature superconductor here at CPES and a high temperature superconductor at The Naval Research Lab.

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