| 摘要 |
An apparatus for the voltage maintenance of an electrical AC voltage supply network (1) is specified, which comprises a partial converter system (2), which has a first branch pair (13) and a second branch pair (14) connected in parallel therewith and an electrical energy store (4) connected in parallel with the branch pairs (13, 14), each branch pair (13, 14) being formed from two series-connected driveable power semiconductor switches with in each case a diode reverse-connected in parallel with each power semiconductor switch, and the junction point of the power semiconductor switches of the first branch pair (13) forming a first terminal (9) of the partial converter system (2) and the junction point of the power semiconductor switches of the second branch pair (14) forming a second terminal (5) of the partial converter system (2). The partial converter system (2) has a third branch pair (3) formed from two series-connected driveable power semiconductor switches with in each case a diode reverse-connected in parallel with each power semiconductor switch, the third branch pair (3) being connected in parallel with the first and second branch pairs (13, 14), and the junction point of the power semiconductor switches of the third branch pair (3) forms a third terminal (18) of the partial converter system (2). Furthermore, a method for operating the apparatus is specified.
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