DEVICE FOR FLEXIBLE POWER TRANSMISSION AND DEICING OF A HIGH-VOLTAGE POWER LINE BY MEANS OF DIRECT CURRENT

摘要

The invention relates to a device (1) for flexibly transmitting power and deicing a polyphase high-voltage power line by means of direct current, said high-voltage power line comprising an AC terminal that has a number of phases corresponding to the phases of the high-voltage power line. Each phase encompasses at least one inductor (6) and a valve circuit (10) that is serially connected to each inductor (6). The valve circuit (10) is connected to the AC terminal by means of a junction point (11) and is provided with a first branch circuit (14) encompassing a first power semiconductor valve (12) as well as a second branch circuit (15) encompassing a second power semiconductor valve (13). The power semiconductor valves (12, 13) are switched in opposite directions relative to the junction point (11). The first and the second branch circuit (15) can be connected to a TCR neutral point by means of at least one neutral switch (16, 17). In order to devise a device (1) that is inexpensive and has a simple design, the TCR neutral point (18) is connected to a neutral point of a zero-sequence suppression means (2, 21) via an interconnecting wire.