Superconducting low voltage dc transmission networks

ABSTRACT A new paradigm for electric power transmission based on high temperature superconducting dc. networks is studied as a feasible alternative to ac power transmission systems. The dc network operates at generation voltages allowing for direct connection of the generators to the rectifiers, eliminating the need for high voltage insulation and transformers. The overall system consists of a mesh connected, low voltage, high current dc superconducting transmission system, supplied by unit connected generators and feeding many small inverters to pass controlled levels of real and reactive power to ac loads. This paper introduces the concept of a superconducting dc mesh. Inverter topologies and control strategies required for interfacing the ac distribution systems to the dc mesh. The paper presents a conceptual overview of the operation of the system based on simulation studies.

[1]  F. J. Edeskuty,et al.  High temperature superconductors for power transmission application , 1988 .

[2]  Thomas A. Lipo,et al.  Design and Performance of a Converter Optimized AC Machine , 1984, IEEE Transactions on Industry Applications.

[3]  R. Lasseter,et al.  Power conditioning systems for superconductive magnetic energy storage , 1991 .

[4]  K. Müller,et al.  Possible highTc superconductivity in the Ba−La−Cu−O system , 1986 .

[5]  Hirofumi Akagi,et al.  A New Neutral-Point-Clamped PWM Inverter , 1981, IEEE Transactions on Industry Applications.

[6]  Takeshi Ishigohka,et al.  Fundamental test of new DC superconducting fault current limiter , 1991 .

[7]  Allen J. Wood,et al.  Power Generation, Operation, and Control , 1984 .

[8]  T. A. Lipo,et al.  Analysis and Steady-State Behavior of an Optimized AC Converter Machine , 1983, IEEE Transactions on Power Apparatus and Systems.

[9]  Y. Laumond,et al.  Towards the superconducting fault current limiter , 1991 .

[10]  R. Adapa,et al.  Power Control Applications on a Superconducting LVdc Mesh , 1991, IEEE Power Engineering Review.

[11]  P. Chowdhuri,et al.  Electrical, cryogenic and systems design of a DC superconducting power transmission line , 1977 .

[12]  R. Adapa,et al.  Control of parallel connected inverters in stand-alone AC supply systems , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[13]  L. K. Kirchmayer,et al.  Economic Operation of Power Systems , 1958 .

[14]  W. F. Long,et al.  Comparison of costs and benefits for dc and ac transmission , 1987 .

[15]  G. Heydt,et al.  A hybrid nonlinear-least squares estimation of harmonic signal levels in power systems , 1991 .

[16]  R. W. Menzies,et al.  Harmonic control and losses of a current source GTO inverter supplying load with AC generation , 1991 .