H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/42
H02M 7/525 (2006.01) H02M 1/088 (2006.01)
Patent
CA 1104646
Abstract of the Disclosure 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.
309097
Fetherstonhaugh & Co.
Licentia Patent-Verwaltungs-Gmbh
LandOfFree
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