Patent ID: 8830712
Filing Date: 2014-09-09
Classification: H02J,H02M,Y02E

Abstract:
1. A method of controlling a capacitor commutated inverter device being connected to an AC voltage bus of an AC power system and converting between DC power and AC power, the inverter device including a number of converter valves in a 6-pulse valve bridge, and the method comprising: receiving measurements of a measured AC voltage (U applying the measured AC voltage in a proportional control branch for obtaining an AC voltage dependent control factor (α determining a commutation margin based control factor (α combining the AC voltage dependent control factor and the commutation margin based control factor through selecting the lower of the commutation margin based control factor and the AC voltage dependent control factor as the maximum limitation signal (α controlling the inverter device to provide a constant AC voltage on the AC voltage bus based on the received measurements through: