Abstract: An arrangement for connecting and disconnecting DC networks includes a main bus for connecting a plurality of DC lines with each other. First and second DC lines are connected between first and second DC networks and the main bus via respective main switches. The DC networks contain a DC operating equipment, such as a converter, an energy storage device, a DC chopper, a DC cable, an energy source and/or a load. A transfer bus that is electrically connected to the main bus has a transfer bus disconnector for disconnecting the main bus from the transfer bus, a transfer switch, and a current limiting device with a resistor and a parallel resistor bypass switch. The first DC line is connected to the transfer bus via a first transfer disconnector and the second DC line is connected to the transfer bus via a second transfer disconnector.

Abstract: An arrangement having a first group of rectifiers, which form a series circuit on the DC voltage side and which can be connected to a first AC voltage network, and having a reserve rectifier that, in the event of a fault in one of the rectifiers, can be electrically connected by suitable switching apparatuses to the first AC voltage network and on the DC voltage side to a first DC voltage line to form an augmented series circuit with the rectifiers. An installation for transmitting electric power between at least one first wind farm with at least one wind power installation and the first power supply system, including the first group of rectifiers, is able to be connected to the first wind farm via the first AC voltage network.

Abstract: An arrangement having a first group of rectifiers, which form a series circuit on the DC voltage side and which can be connected to a first AC voltage network, and having a reserve rectifier that, in the event of a fault in one of the rectifiers, can be electrically connected by suitable switching apparatuses to the first AC voltage network and on the DC voltage side to a first DC voltage line to form an augmented series circuit with the rectifiers. An installation for transmitting electric power between at least one first wind farm with at least one wind power installation and the first power supply system, including the first group of rectifiers, is able to be connected to the first wind farm via the first AC voltage network.

Abstract: A DC voltage circuit breaker includes at least one interrupter and a commutator device connected in parallel with the interrupter. The commutator device includes a capacitor circuit. The capacitor circuit includes a parallel circuit having at least two capacitor branches and the capacitor branches each have a capacitor in series with a capacitor branch switch.

Abstract: In order to provide an apparatus (1) for flexible power transmission and for deicing of a high-voltage line, which has a plurality of phases, by means of direct current, with an AC voltage connection of the high-voltage line which has a number of phases corresponding to the phases of the high-voltage line, each phase having at least one inductance (6) and a valve circuit (10) connected in series with each inductance (6), with the valve circuit (10) being connected by means of a junction point (11) to the AC voltage connection, and having a first current path (14) with a first power semiconductor valve (12) and a second current path (15) with a second power semiconductor valve (13), with the power semiconductor valves (12, 13) being connected in opposite senses with respect to one another with reference to the junction point (11) and in which case the first and the second current path (15) can be connected to a TCR star point by means of at least one star point switch (16, 17), whose design is simple and at th

Abstract: In order to provide an apparatus (1) for flexible power transmission and for deicing of a high-voltage line, which has a plurality of phases, by means of direct current, with an AC voltage connection of the high-voltage line which has a number of phases corresponding to the phases of the high-voltage line, each phase having at least one inductance (6) and a valve circuit (10) connected in series with each inductance (6), with the valve circuit (10) being connected by means of a junction point (11) to the AC voltage connection, and having a first current path (14) with a first power semiconductor valve (12) and a second current path (15) with a second power semiconductor valve (13), with the power semiconductor valves (12, 13) being connected in opposite senses with respect to one another with reference to the junction point (11) and in which case the first and the second current path (15) can be connected to a TCR star point by means of at least one star point switch (16, 17), whose design is simple and at th

Abstract: A high-power grid-compatible converter-controlled, voltage-injecting phase-shifting transformer, includes a converter, an energizer transformer connected the converter, and a booster transformer which has at least one phase connected to the converter. The converter has an excitation-side power converter with at least one phase intercoupled by a DC intermediate circuit to an output-side power converter with at least one phase. Each of the excitation-side power converter and the output-side power converter have turnoff power semiconductors. Each phase of the excitation-side power converter has n double cascades electrically connected in series. Each of the double cascades have a capacitive energy store with a terminal and two switching devices which include the turnoff power semiconductors connected electrically in parallel with the capacitive energy store. Each phase of the output-side power converter has n four-quadrant controllers with AC voltage terminals and DC voltage terminals.

Abstract: A method and an apparatus for reducing harmonics mains-power-supply perturbations of a self-commutated multilevel inverter which is clocked at the fundamental frequency and has capacitive storage devices. On one hand, when a predetermined operating point of the multilevel inverter is left, angular values for turn-on and turn-off instants of individual voltage levels of the multilevel inverter are calculated for a newly determined operating point. On the other hand, a terminal voltage of the multilevel inverter is matched to an altered fundamental amplitude of the inverter output voltage. Consequently, the harmonics mains-power-supply perturbations of a multilevel inverter can be kept to a minimum at any time.

Abstract: A switch-off method for a three-phase solid state reactive power compensator for a rotary three phase power system has first and second thyristor valves receiving respective first and second firing signals, and three capacitors. The firing signals are suppressed to a point in time for first turning off the second firing thyristor valve in immediately successive phases in direction of rotation of the three-phase power system.

Abstract: A device for increasing the fundamental power yield of a self-commutated inverter with a capacitive storage device. The device is connected to the outputs of a self-commutated inverter, providing at least one single-phase cascade per R, S and T phase. Each single-phase cascade includes a capacitive storage device and a switching device with which the capacitive storage device can be switched into phase and out of phase with respect to the phase with which the cascade is associated.