A method is presented for controlling a modular converter, said modular converter in particular comprising a plurality of M converter cells (36), each converter cell comprising an AC-to-DC converter (40), a primary side of which represents a primary side of said converter cell, said AC-to-DC converter being an active AC-to-DC converter comprising a plurality of semiconductor switches (46a-d), and operable in one of a plurality of modes, the plurality of modes comprising a bypassed mode, an active mode, and a diode mode; a DC-to-DC converter (42), a secondary side of which represents a secondary side of said converter cell; with a secondary side of said AC-to-DC converter and a primary side of said DC-to-DC converter connected in parallel with a DC-link capacitor (50), wherein the primary sides of the converter cells are connected in series, with a first converter cell connected to a line (16), preferably a medium voltage line, providing an AC line voltage U ( t ) having a peak value Û , and an M -th converter cell connected to a ground (22); the method comprising the steps of: for a given allowable range [ U min , U max ] of a DC-voltage U DC at the DC-link capacitor determining whether any integer number N ¤ M exists for which and and if such integer number N exists: selecting an integer number L with L < N , selecting a first set of N - L converter cells, selecting a second set of L converter cells, putting the AC-to-DC converter of, preferably all, converter cells which have not been selected in steps ii) or iii) into bypassed mode, putting the AC-to-DC converter of, preferably all, converter cells from the first set into diode mode, putting the AC-to-DC converter of, preferably all, converter cells from the second set into active mode.
METHOD FOR CONTROLLING OF A MODULAR CONVERTER
VERFAHREN ZUR STEUERUNG EINES MODULAREN UMRICHTERS
PROCÉDÉ DE COMMANDE D'UN CONVERTISSEUR MODULAIRE
19.06.2019
Patent
Elektronische Ressource
Englisch
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |