CONVERTER CONTROL APPARATUS

摘要

: The present invention relates to a converter control apparatus. Two rectifiers and two inverters are operated and are connected in parallel by common transmission lines. These rectifiers and inverters are controlled by independent control apparatuses, respectively, which can selectively apply either constant current control or constant voltage control. The control apparatus of each converter has bestowed thereon reference value of a current flowing through the particular converter and the reference value of a terminal voltage of the particular converter. A signal for lowering the current reference value is added to the control apparatus of one or all of the converters which are to be operated as the inverters. A signal for essentially rendering the terminal voltage of the converter smaller than the voltage reference value is added to the control apparatus of the converter which is to be operated as the converter for determining the voltage of a direct current system.