Abstract:
A converter connection for improving the symmetry of a threephase network comprises a three-phase line-commutated controlled converter which has its AC terminals connected to the network and its DC terminals to a reactor. Firing pulses are supplied to the rectifiers of the three rectifier groups of the converter, each of which comprises the two rectifiers connected to one of the three phase conductors of the network to fire the two rectifiers of each group at a fixed 180* interval. The phase angle in relation to the AC network voltage of the firing pulses is individually controlled for each of the three groups in dependence upon the deviation of the AC voltage of a point in the network from a reference level, the reference levels of the three groups being substantially equal.
Abstract:
An oscillator-controlled, self-commutated inverter connection for generating a single- or multi-phase alternating voltage and transmitting power from a direct voltage source to an alternating voltage consumer includes two inverter units, each including capacitor bank connected to the AC terminals of the inverter unit and a converter of the line-commutated type. The AC outputs of the converter are connected to the AC terminals of the inverter unit and the DC outputs are connected to the DC source. Reactor connections connect the DC outputs of the converter to the poles of the DC source. A second converter of the line-commutated type is connected by its DC outputs to the DC source. The two converters are anti-parallel connected to the DC source.
Abstract:
An arrangement for generating reactive power includes first and second line-commutated converters, the AC terminals of which are connected to an alternating voltage network to which a capacitor bank is also connected. Two branchless connections connect the converters in anti-parallel relation on the DC side and constitute an unloaded DC intermediate line, each DC terminal of each converter being connected by a branchless reactor connection to a DC terminal of the other converter.