Stressing of turbine-generator-exciter shafts by variable-frequency currents superimposed on DC currents in asynchronous HVDC links and following disturbances at converter stations
- Univ. of Glasgow (United Kingdom)
Ripple currents on the DC side of both HVDC synchronous and asynchronous. Links together with cleared HVDC and AC system disturbances can excite in some circumstances onerous torsional vibrations in large steam generator shafts. The problem has assumed importance in recent months on account of the HVDC Link between Scotland and Northern Ireland going ahead, on account of the proposed Eire/Wales Link, and because AC/DC/AC couplers are to be installed extensively to interconnect the East and West European Grid Systems. This paper discusses and analyses excitation of shaft torsional vibrations in steam turbine-generator-exciter shafts in close proximity to HVDC converter stations by (1) variable-frequency ripple currents superimposed on the DC currents in asynchronous Links, and (2) disturbances at bi-polar converter stations. The time response and tables show that for the systems studied variable-frequency ripple currents superimposed on the DC current in asynchronous Links can excite shaft torsional vibrations, the very small noncharacteristic currents could result in onerous shaft torques which might damage the machine, and that DC line faults at converter stations in close proximity of steam turbine-generator units can excite onerous turbine-generator shaft torsional response. Detailed simulation of the HVDC converter and generator is necessary for precise assessments of shaft torsional response following HVDC converter station faults. 500MW, 660MW, 1000MW and 1300MW machines are considered in the analyses that are made.
- OSTI ID:
- 6970223
- Journal Information:
- IEEE Transactions on Energy Conversion (Institute of Electrical and Electronics Engineers); (United States), Vol. 9:3; ISSN 0885-8969
- Country of Publication:
- United States
- Language:
- English
Similar Records
Power links with Ireland -- Excitation of turbine-generator shaft torsional vibrations by variable frequency currents superimposed on DC currents in asynchronous HVDC links
HVDC system control for damping of subsynthronous oscillations. Final report
Related Subjects
HVDC SYSTEMS
STEAM GENERATORS
MECHANICAL SHAFTS
MECHANICAL VIBRATIONS
DIRECT CURRENT
INTERCONNECTED POWER SYSTEMS
RESPONSE FUNCTIONS
BOILERS
CURRENTS
DC SYSTEMS
ELECTRIC CURRENTS
ENERGY SYSTEMS
FUNCTIONS
MACHINE PARTS
POWER SYSTEMS
SHAFTS
VAPOR GENERATORS
240100* - Power Systems- (1990-)