Feasibility of gate-turnoff thyristors in a high-voltage direct-current transmission system: Final report
This study to identify potentially attractive applications for gate-turnoff thyristor (GTO) converters in utility systems includes both high-voltage direct-current (HVDC) valves and static volt-ampere reactive (VAR) controllers. The work includes a broad review of basic principles and the power circuit arrangements that are judged to be most attractive. The major differences between ordinary thyristors and GTO converters are discussed, including alternative HVDC transmission systems and static VAR controllers that are possible with GTOs. Whereas a current-source type of converter is the obvious choice with ordinary thyristors, the use of GTOs allows either current-source or voltage-source converters to be considered. A computer-aided analysis of the basic 6-pulse GTO current-source converter system is presented, including general equations for steady-state operation and plotting calculated waveforms. An analysis of a GTO voltage-source converter is given in less detail. Due to incomplete performance data, unresolved critical problems such as protection, and the disadvantages of higher cost, complexity and losses, it is difficult to recommend a specific GTO converter system at this time. The major advantage that GTO converters can offer is rapid and smoothly continuous control of reactive power. Further development of GTO converters should be aimed towards an application where reactive power control is very important and not readily achievable by conventional methods. 12 refs., 47 figs.
- Research Organization:
- General Electric Co., Malvern, PA (USA). Power Systems Management Business Dept.; General Electric Co., Schenectady, NY (USA). Corporate Research and Development Dept.; Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 6305506
- Report Number(s):
- EPRI-EL-5332; ON: TI87920545
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
24 POWER TRANSMISSION AND DISTRIBUTION
DATA
DC SYSTEMS
ELECTRICAL EQUIPMENT
ENERGY SYSTEMS
EQUIPMENT
FEASIBILITY STUDIES
HVDC SYSTEMS
INFORMATION
INVERTERS
NUMERICAL DATA
POWER SYSTEMS
RECTIFIERS
SEMICONDUCTOR DEVICES
TECHNOLOGY ASSESSMENT
THEORETICAL DATA
THYRISTORS