Converter control with compensation of disturbances in the commutation voltages

Claim 1

A STATIC INVERTER CONNECTING A DIRECT CURRENT NETWORK TO A MULTIPHASE ALTERNATING CURRENT NETWORK AND COMPRISING A RECTIFIER CONNECTION BETWEEN SAID TWO NETWORKS; CONTROL MEANS DELIVERING CONTROL PULSES TO THE RECTIFIERS OF SAID RECTIFIER CONNECTION WITH A CERTAIN DELAY ANGLE; SAID CONTROL MEANS COMPRISING FOR EACH RECTIFIER AN INPUT CIRCUIT; MEANS TO FEED TO THE INPUT CIRCUITS A DIRECT CURRENT MAGNITUDE AND MEANS TO FEED AND ALTERNATING CURRENT MAGNITUDE; SAID FEEDING MEANS BEING CONNECTED IN SERIES TO SAID INPUT CIRCUITS; SAID CONTROL MEANS INCLUDING MEANS TO DELIVER A CONTROL PULSE TO SAID RECTIFIER WHEN THE SUMS OF SAID TWO SERIES CONNECTED MAGNITUDES ATTAINS A PRE-DETERMINED VALUE; SAID MEANS TO FEED A DIRECT CURRENT MAGNITUDE INCLUDING A DIRECT CURRENT MEASURING MEANS FOR MEASURING THE LOAD CURRENT OF SAID INVERTER; SAID DIRECT CURRENT MEASURING MEANS BEING COMMON TO ALL THE RECTIFIERS; SAID MEANS TO FEED AN ALTERNATING CURRENT MAGNITUDE INCLUDING MEANS FOR DERIVING ALTERNATING VOLTAGES PROPORTIONAL TO THE COMMUTATION VOLTAGES OF THE DIFFERENT RECTIFIERS AND A PHASE SHIFTER BETWEEN SAID ALTERNATING VOLTAGE DERIVING MEANS AND SAID CONTROL CIRCUIT; CHARACTERIZED BY ADDITIONAL MEANS FOR DELIVERING A DIRECT CURRENT MAGNITUDE WHICH IS ADDED TO SAID FIRST DIRECT CURRENT MAGNITUDE; SAID ADDITIONAL MEANS COMPRISING A RECTIFIER CONNECTION CONNECTED TO SAID ALTERNATING CURRENT NETWORK AND INCLUDING A BAND BLOCK FILTER; SAID BAND BLOCK FILTER BEING TUNED TO THE RATED FREQUENCY OF SAID ALTERNATING CURRENT NETWORK.