Power converter for trasmitting power between networks

A converter circuitry configured to transmit power between a first electricity network and a second electricity network, the first electricity network being either a single-phase DC network or a polyphase AC network, and the second electricity network being either a single-phase DC network or a polyphase AC network, the converter circuitry comprising:

• a plurality of low-voltage power cells which are connected from their input connections (IN) to the first electricity network,
• a plurality of low-voltage power cells which are connected from their input connections (IN) to the second electricity network,
• at least one power bus,
• wherein the output connections (OUT) of each power cell are coupled to a power bus via a transformer, and
• wherein each low-voltage power cell comprises an intermediate DC link capacitor and a controllable power semiconductor H-bridge coupled to the output connection (OUT), and
• wherein the at least one power bus is coupled to a low-voltage power unit which is able to generate an AC voltage with varying pulse ratio to all power buses connected to it.