Method and apparatus for suppressing resonance phenomena in the

Details Method and apparatus for suppressing resonance phenomena in the Method and apparatus for suppressing resonance phenomena in the

1985-08-07

1987-08-04

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 35, H02H 700

Patent

active

046850449

ABSTRACT:
If in a high-voltage d-c transmission system (HVDCTS), a resonance frequency of an a-c voltage network (NB) connected to the inverter (1B) is located in the vicinity of a voltage component contained in the a-c voltage network, a resonance frequency which often cannot be compensated by a current regulator controlling the rectifier stage (1A) is coupled into the d-c circuit of the HVDCTS via the inverter. Therefore, resonance phenomena which requires an emergency shutdown of the HVDCTS are generated. Therefore, a pilot quantity (U'.sub.d) is formed with a defined phase shift relative to the resonance oscillation of the HVDCTS voltage and added to the output of the current regulator. Thereby, a constant HVDCTS current can be generated for a given operating point and the resonance in the a-c voltage network (NB) can be damped. If the resonance oscillation is determined by two quantities (U'.sub.d, i'.sub.d) of, respectively, the HVDCTS voltage as well as of the HVDCTS current, stable damping of the resonance phenomena can be achieved by the pilot control described with the two quantities even for deviating operating points.

REFERENCES:
patent: 4555750 (1985-11-01), Matsumura et al.
patent: 4591963 (1986-05-01), Retotar
Patterson, Neal A., Carrier Frequency Interference from HUDC Systems, IEEE Transactions on Power Apparatus and Systems, vol. PAS-104, No. 11, Nov. 1985, pp. 3255-3261.

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