Patent ID: 7105948
Filing Date: 2006-09-12
Classification: H02J,Y02E

Abstract:
1. An apparatus for the voltage maintenance of an electrical AC voltage supply network with a partial converter system, comprising: a first branch pair and a second branch pair connected in parallel therewith and an electrical energy store connected in parallel with the branch pairs, each branch pair being formed from two series-connected driveable power semiconductor switches with in each case a diode is reverse-connected in parallel with each power semiconductor switch, and the junction point of the power semiconductor switches of the first branch pair is connected to a first terminal of the partial converter system and the junction point of the power semiconductor switches of the second branch pair is connected to a second terminal of the partial converter system, wherein the partial converter system has a third branch pair formed from two series-connected driveable power semiconductor switches with in each case a diode is reverse-connected in parallel with each power semiconductor switch, the third branch pair being connected in parallel with the first and second branch pairs, and wherein the junction point of the power semiconductor switches of the third branch pair is connected to a third terminal of the partial converter system, wherein a driveable isolating switch is connected between the first terminal and the second terminal.