Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1978-08-09
1980-07-08
Shoop, William M.
Electric power conversion systems
Current conversion
Having plural converters for single conversion
363 96, H02M 700
Patent
active
042120551
ABSTRACT:
In the operation of a control arrangement for the direct voltage of an inverter station which inverter station includes a plurality of thyristor bridges which are connected in series at their direct voltage side and connected to a three-phase mains via a plurality of variable ratio transformers each individually associated with a respective thyristor bridge, a plurality of extinction angle circuits each associated with a respective thyristor bridge, and a total control circuit for controlling the voltage of all thyristor bridges together, the control circuit providing an output corresponding to the direct voltage of the inverter station and responding to a setting value representative of the transformer stage adjustment which operates in synchronism for all thyristor bridges, the control arrangement is matched to the control path by comparing a measured value which corresponds to the direct bridge voltage of each thyristor bridge with the instantaneous maximum value of the measured values for all thyristor bridges, and, whenever a measured value differs from the maximum value by more than a predetermined amount, instantaneously switching off the respective thyristor bridge and correspondingly matching the control value for the transformer stage adjustment and the circuit gain of the total control circuit.
REFERENCES:
patent: 3280334 (1966-10-01), Uhlmann et al.
patent: 3530362 (1970-09-01), Filimonov et al.
patent: 3962624 (1976-06-01), Ostlund et al.
patent: 4084206 (1978-04-01), Leowald et al.
patent: 4084221 (1978-04-01), Ogata
LICENTIA Patent-Verwaltungs-G.m.b.H.
Shoop William M.
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