Abstract: An exemplary power-electronic switching system has a plurality of switching units, wherein each switching unit includes a housing and at least one switching module which is arranged within the housing. A mounting unit has a holding apparatus, on which the housings of the switching units are arranged. The holding apparatus includes an insulation material for electrically insulating the holding apparatus from the housings of the switching units and the housings of the switching units from one another. The insulation material allows the housings of the switching units of the switching system to have different voltage potentials from one another and additionally can be realized in a simple and space-saving manner and easily be assembled. In addition, the housing of each switching unit includes a material for at least partially shielding an electric and magnetic field.

Abstract: An exemplary power-electronic switching system has a plurality of switching units, wherein each switching unit includes a housing and at least one switching module which is arranged within the housing. A mounting unit has a holding apparatus, on which the housings of the switching units are arranged. The holding apparatus includes an insulation material for electrically insulating the holding apparatus from the housings of the switching units and the housings of the switching units from one another. The insulation material allows the housings of the switching units of the switching system to have different voltage potentials from one another and additionally can be realized in a simple and space-saving manner and easily be assembled. In addition, the housing of each switching unit includes a material for at least partially shielding an electric and magnetic field.

Abstract: A method for operation of a converter circuit is specified, wherein the converter circuit has a converter unit with a multiplicity of drivable power semiconductor switches and an LCL filter which is connected to each phase connection of the converter unit, in which method the drivable power semiconductor switches are driven by means of a drive signal which is formed from reference voltages. The reference voltages are formed by subtraction of damping voltages from reference-phase connection voltages, with the damping voltages being formed from filter capacitance currents, weighted with a variable damping factor of the LCL filter. An apparatus for carrying out the method is also specified.

Abstract: A converter circuit having a first and a second converter element is specified, with each converter element having a DC voltage circuit and in each case one converter element phase (u1, v1, w1) of the first converter element being connected to a respective converter element phase (u2, v2, w2) of the second converter element. Furthermore, a transformer is provided, with the secondary windings of the transformer being connected to the connected converter element phases (u1, v1, w1, u2, v2, w2) of the first and second converter elements.

Abstract: A method for operation of a converter circuit is specified, wherein the converter circuit has a converter unit with a multiplicity of drivable power semiconductor switches and an LCL filter which is connected to each phase connection of the converter unit, in which method the drivable power semiconductor switches are driven by means of a drive signal which is formed from reference voltages. The reference voltages are formed by subtraction of damping voltages from reference-phase connection voltages, with the damping voltages being formed from filter capacitance currents, weighted with a variable damping factor of the LCL filter. An apparatus for carrying out the method is also specified.

Abstract: A converter circuit is specified for switching a large number of switching voltage levels, which has n first switching groups for each phase, with the n-th first switching group being formed by a first power semiconductor switch and a second power semiconductor switch, and with the first first switching group to the-th switching group each being formed by a first power semiconductor switch and a second power semiconductor switch and by a capacitor, which is connected to the first and second power semiconductor switches, with each of the n first switching groups being connected in series to the respectively adjacent first switching group, and with the first and the second power semiconductor switches in the first first switching group being connected to one another.

Abstract: A converter circuit having a first and a second converter element is specified, with each converter element having a DC voltage circuit and in each case one converter element phase (u1, v1, w1) of the first converter element being connected to a respective converter element phase (u2, v2, w2) of the second converter element. Furthermore, a transformer is provided, with the secondary windings of the transformer being connected to the connected converter element phases (u1, v1, w1, u2, v2, w2) of the first and second converter elements.

Abstract: Systems and methods of the present invention are directed to wind energy. Wind rotors (1) drive at least two generators (2) which each have a corresponding rectifier unit (3). The rectifier unit (3) being an active rectifier having drivable power semiconductor components. An energy storage circuit (4) is associated with each rectifier unit (3) and is connected in parallel to a first busbar system (7). Each energy storage circuit (4) having at least one DC voltage capacitance, and the first busbar system (7) having a first protection switch (5) in at least one connection.

Abstract: A converter circuit is specified for switching a large number of switching voltage levels, which has n first switching groups for each phase, with the n-th first switching group being formed by a first power semiconductor switch and a second power semiconductor switch, and with the first first switching group to the-th switching group each being formed by a first power semiconductor switch and a second power semiconductor switch and by a capacitor, which is connected to the first and second power semiconductor switches, with each of the n first switching groups being connected in series to the respectively adjacent first switching group, and with the first and the second power semiconductor switches in the first first switching group being connected to one another.

Abstract: A wind energy system is specified, which comprises at least two generators (2) which are driven by means of wind rotors (1), a rectifier unit (3) for each generator (2), an energy storage circuit (4) for each rectifier unit (3), a first busbar system (7), to which the energy storage circuits (4) are connected in parallel, a transmission system (8), which is connected to the first busbar system (7), a network coupling device (15), which is connected to the transmission system (8), and a network transformer (16), which is connected to the network coupling device (15) for coupling to an electrical AC voltage supply network. Furthermore, each rectifier unit (3) is in the form of an active rectifier unit (3) with drivable power semiconductor components, and each energy storage circuit (4) has at least one DC voltage capacitance and, in at least one connection for the first busbar system (7), at least one first protection switch (5) in the form of a semiconductor switch.

Abstract: A converter circuit arrangement for increasing an alternating voltage is specified, which has a converter (2), which is designed as an inverter, a filter circuit (3) being connected to alternating voltage terminals (8.1, 8.2) of the converter (2) and the filter circuit (3) including at least one partial filter circuit (4). Furthermore, the partial filter circuit (4) is designed in such a way that a converter output current (IU) flowing in the partial filter circuit (4) is leading in time with respect to a partial filter output voltage (UF) present at load terminals (5, 6) of the partial filter circuit (4) and a converter output voltage (UU) present at the alternating voltage terminals (8.1, 8.2) is limited to a specifiable value (|UUb|).

Abstract: A converter system has a number of individual converter modules, which are in the form of load converter modules or power supply system converter modules and are connected to one another via a DC voltage intermediate circuit which has two DC voltage busbars and a DC voltage intermediate circuit capacitance arranged between the DC voltage busbars. A defective converter module is isolated from a common intermediate circuit, in which interruption-free further operation of the other modules on the intermediate circuit is possible and in which the isolating means are not destroyed. The DC voltage intermediate circuit capacitance is subdivided into a number of parts corresponding to the number of converter modules. Each of the converter modules is associated with a portion of the DC voltage intermediate circuit capacitance and forms a local intermediate circuit. The converter modules are coupled together with their local intermediate circuits to the DC voltage busbars by at least one protective switch.

Abstract: A converter system (10) has a number of individual converter modules (13, . . . , 17), which are in the form of load converter modules (13, . . . , 15) or power supply system converter modules (16, 17) and are connected to one another via a DC voltage intermediate circuit (11, 12; 29; C1, . . . , CS) which has two DC voltage busbars (11, 12) and a DC voltage intermediate circuit capacitance (C1, . . . , CS) arranged between the DC voltage busbars (11, 12).

Abstract: A converter with a DC voltage intermediate circuit and including a rectifier circuit having an AC voltage input and a DC voltage output, which rectifier circuit can be connected to a power supply system, an invertor circuit having a DC voltage input and an AC voltage output, and a DC voltage intermediate circuit, which is arranged between the DC voltage output of the rectifier circuit and the DC voltage input of the invertor circuit. Also included is two connecting lines, leading from the DC voltage output of the rectifier circuit to the DC voltage input of the invertor circuit, and at least one intermediate circuit capacitor arranged between the connecting lines. A simplified structure is achieved by virtue of the fact that in order to protect the converter in the event of a short circuit, a first controllable semiconductor switch is arranged in at least one of the connecting lines between the DC voltage output of the rectifier circuit and the at least one intermediate circuit capacitor.

Abstract: A voltage converter having a voltage intermediate circuit and an invertor connected to the output of the voltage intermediate circuit. The invertor produces a three-phase AC voltage at its output and is connected to the output terminals of the voltage converter by a filter arrangement. The filter arrangement includes a filter inductor connected in series with the output terminal and the filter capacitor connected between the output terminal and a common capacitor star point. Attenuation of the DC system is achieved by having the capacitor star point connected to the voltage intermediate circuit by way of an RC element having a capacitor and a resistor.