Electrical frequency converter for coupling an electrical power supply grid with an electrical drive

An electrical frequency converter for coupling an electric transformer with an electrical drive, comprising:

• at least one rectifier connected to the transformer;
• and
• an inverter connected to the rectifier and the electrical drive, the inverter having at least two connections in series, each connection in series including a plurality of modular switches, each modular switch of the plurality of modular switches comprising:
• a first connection in series comprising a first controllable power semiconductor component and a first diode coupled at a first connection point, the first connection point defining a first connection of each modular switch;
• a capacitor;
• wherein the first connection in series, the second connection in series and the capacitor are connected in parallel to one another;
• and
• wherein the number of connections in series corresponds to a number of phases of the electrical drive.

An electric inverter for coupling an electric power supply grid to an electric compensation, comprising:

• a rectifier connected to the electrical power supply grid and an inductance connected to the rectifier, the rectifier having a number of connections in series that corresponds to a number of phases of the electrical power supply grid, wherein each of the connections in series includes a plurality of modular switches, wherein each modular switch includes:
• a first connection in series comprising a first controllable power semiconductor component and a first diode coupled at a first connection point, the first connection point defining a first connection of each modular switch;
• a second connection in series comprising a second controllable power semiconductor component and a second diode coupled at a second connection point, the second connection point defining a second connection of each modular switch;
• a capacitor;
• and
• wherein the first connection in series, the second connection in series and the capacitor are connected in parallel.

An electrical mains coupling inverter for coupling a first electrical power supply grid to a second electrical power supply grid, comprising;

• a first power converter connected to the first electrical power supply grid, the first power converter having at least two connections in series;
• a second power converter connected to the second electrical power supply grid, the second power converter having at least two connections in series;
• and
• wherein each of the connections in series of the first and second power;
• converters includes a plurality of modular switches, wherein each modular switch comprising:
• a first connection in series comprising a first controllable power semiconductor component and a first diode coupled at a first connection point, the first connection point defining a first connection of each modular switch;
• a second connection in series comprising a second controllable power semiconductor component and a second diode coupled at a second connection point, the second connection point defining a second connection of each modular switch;
• a capacitor;
• and
• wherein the first connection in series, the second connection in series and the capacitor are connected in parallel to one another;
• and
• wherein the first power converter includes a number of the connections in series that corresponds to a number of phases of the first electrical power supply grid, and the second power converter includes a number of the connections in series that corresponds to a number of phases of the second electrical power supply grid.