Direct current tight coupling

Claim 1

A d.c. short coupling for connecting a first and a second asynchronous, high-voltage, three-phase, power network comprising: a three-phase, full-wave static converter arrangement having a Wye-connected secondary static converter transformer, and a Delta-connected secondary static converter transformer and controllable semiconductors allocated to each of the networks to be connected by said short coupling; said controllable semiconductors are controlled by a central electronic control unit so that a network-supplying power static converter assembly functions as a rectifier and a network-receiving-power static converter assembly functions as an inverter, and the controllable semiconductors of each functional assembly are arranged in a stack pattern forming matching static converter towers connected together on the d.c. power coupling side at the same voltage polarity, and on the three-phase, a.c. power side with respective Wye-connected secondary and Delta-connected secondary sides of the static converter transformers; and each of the two full-wave static converter arrangements has two full-wave controllable semiconductor subassemblies allocated to the Wye-connected and the Delta-connected secondary sides of the static converter transformers, each semiconductor subassembly forming a static converter tower, said four static converter towers are arranged in a rectangular pattern and assembled in such a manner that the static converter towers electrically connected to the secondary sides of the static converter transformers of one power network and the static converter towers electrically connected to the secondary sides of the static converter transformers are located next to each other, parallel to the static converter towers, and the static converter towers electrically connected to the Delta-connected secondary sides of both power networks and the static converter towers electrically connected to the Wye connected secondary sides of both power systems face each other.