| 摘要 |
In a method for controlling a Voltage Source Converter having at least one phase leg comprising a series connection of switching elements (7), in which each said element has at least two semi-conductor devices (16, 17) of turn-off type, at least two free- wheeling diodes (18, 19) connected in parallel therewith and at least one energy storing capacitor (20), each said switching element is controlled according to a Pulse Width Modulation pattern so that each switching element is switched to change between applying a zero voltage and the voltage across its capacitor across its terminals each time a saw tooth voltage wave for that switching element crosses a reference alternating voltage belonging to that switching element. |
