Abstract: A system and method are disclosed for controlling an inverter to provide an alternating inverter voltage to a load for a transition in which a change in active power (P) and/or reactive power (Q) within a transition time (Ttr) is carried out. The method includes converting a direct current voltage (Udc) into an alternating inverter voltage (Vinv) with a basic frequency (?); and selecting a transition time Ttr for a change in active power (P) and/or reactive power (Q) within a load to be supplied the alternating inventor voltage. To address DC offsets, the transition time Ttr is chosen such that in an equation which is a function of the fundamental period of the basic frequency and the target phase angle after the transition between the inverter voltage Vinv and the load voltage Vn, a variable k is a small integer number between 1-8.

Abstract: A system and method are disclosed for controlling an inverter to provide an alternating inverter voltage to a load for a transition in which a change in active power (P) and/or reactive power (Q) within a transition time (Ttr) is carried out. The method includes converting a direct current voltage (Udc) into an alternating inverter voltage (Vinv) with a basic frequency (w); and selecting a transition time Ttr for a change in active power (P) and/or reactive power (Q) within a load to be supplied the alternating inventor voltage. To address DC offsets, the transition time Ttr is chosen such that in an equation which is a function of the fundamental period of the basic frequency and the target phase angle after the transition between the inverter voltage Vinv and the load voltage Vn, a variable k is a small integer number between 1-8.

Abstract: A power supply comprising a DC-DC converter which comprises (a) a first transformer (11); (b) a second transformer (12); (c) a first H-bridge switching circuit (13) for selectively connecting a primary DC source (14) to the primary winding of said first transformer; (d) a second H-bridge (15) switching circuit for selectively connecting said primary DC source (14) to the primary winding of said second transformer (12); (e) a bridge rectifier circuit (16) connected to the secondary windings of said first and second transformers; and (f) a control circuit (17) for providing sets of control pulses for effecting switching of switching elements of the first and the second H-bridge switching circuits (13, 15).

Abstract: A power supply comprising a DC-DC converter which comprises

Abstract: A static converter circuit has a voltage summing transformer (Tr-Tr13) with several part transformers (Tr1-Tr13) the static-converter-side winding of which are connected via one four-quadrant actuator each to a direct-voltage link circuit. The four-quadrant actuators are single-phase bridge circuits with one GTO thyristor each and a diode, which is antiparallel thereto, per bridge branch. The static-converter-side windings of the part transformers can be short circuited in each case by means of an alternating-current circuit breaker with antiparallel-connected thyristors. Each part transformer has a separate core. The power-system-side windings of the power transformers are connected in series and are connected at their ends to a railroad power system with 162/3-Hz. The direct-voltage link circuit is connected via power-system-commutated static converters and a static converter transformer to a national power system with 50 Hz.