Apparatus for the voltage maintenance of an electrical AC voltage supply network and method for operating such an apparatus
First Claim
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, andwherein 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.
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Abstract
A method and apparatus for the voltage maintenance of an electrical AC voltage supply network comprising a partial converter system, which has 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 is formed from two series-connected driveable power semiconductor switches, each with a diode reverse-connected in parallel, and the junction point of the power semiconductor switches of the first branch pair forming a first terminal and the junction point of the power semiconductor switches of the second branch pair forming a second terminal. The partial converter system has a third branch pair connected in parallel with the first and second branch pairs. The junction point of the power semiconductor switches of the third branch pair forms a third terminal.
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Citations
35 Claims
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1. An apparatus for the voltage maintenance of an electrical AC voltage supply network with a partial converter system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for operating an apparatus for the voltage maintenance of an electrical AC voltage supply network, comprising the steps of:
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in the event of a fall in voltage of a voltage source of the electrical AC voltage supply network, said voltage source being connected to the partial converter system, driving the partial converter system in such a way that essentially the rated voltage of the voltage source is established at a first terminal of the partial converter system, the 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, and 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; driving the first branch pair and the second branch pair in such a way that essentially the rated voltage of the voltage source is set at the first terminal; and driving the second branch pair and a third branch pair of the partial converter system, which is 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 is connected in parallel with the first and second branch pairs, the junction point of the power semiconductor switches of the third branch pair being connected to a third terminal of the partial converter system, in such a way that the electrical energy store is charged by the voltage source, wherein, when the fall in voltage of the voltage source occurs, opening a driveable isolating switch connected between the first terminal and the second terminal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method for operating an apparatus for the voltage maintenance of an electrical AC voltage supply network, the apparatus having a partial converter system and the partial converter system having 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, and each branch pair 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 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, and the partial converter system having a third branch pair 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 being connected in parallel with the first and second branch pairs, and the junction point of the power semiconductor switches of the third branch pair is connected to a third terminal of the partial converter system, in which, in the event of a fall in voltage of a voltage source of the electrical AC voltage supply network, which voltage source is connected to the partial converter system, comprising the steps of:
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setting essentially the rated voltage of the voltage source at the first terminal by the partial converter system; wherein, when the fall in voltage of the voltage source occurs, opening a driveable isolating switch connected in between the first terminal and the second terminal; impressing a compensation voltage between the first terminal and the second terminal for the purpose of setting the rated voltage by means of the first branch pair and the second branch pair; charging the energy store with electrical energy from the voltage source by means of the second branch pair and the third branch pair.
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Specification