STAR POINT REACTOR

摘要

The invention relates to a device (1) for inverting an electric parameter in the field of power transmission and distribution, having an inverter (2) that can be connected between an alternating current grid (11) and a DC circuit (7), comprising power semiconductor valves (3) extending between an alternating current connection (4) and a DC voltage connection (5, 6), wherein each power semiconductor valve (3) comprises a series circuit of bipolar submodules (8), each comprising an energy store and a power semiconductor circuit disposed in parallel to the energy store, and a grid connection unit (9) connected to the alternating current connection (4) for connecting to the alternating current grid (11), by means of which a simple, effective, and inexpensive symmetrization of the voltages in the DC voltage circuit relative to ground potential is brought about, a star point reactor (14) connected between the grid connection unit (9) and the inverter (2) with a potential point (13) is proposed, comprising throttle coils (15) connected to a grounded star point (16), wherein the throttle coils (15) are implemented so that said coils implement a current path having a high impedance to the ground potential for alternating current at the base frequency of the alternating current grid (11), and having low impedance to the ground potential for DC current.