Black start of a multilevel voltage source converter
First Claim
1. A multilevel voltage source converter comprising:
- cells connected in cascade, each of the cells having;
a first and a second cell terminal;
a cell capacitor;
a first switch between a first end of the cell capacitor and the first cell terminal;
a second switch between a second end of the cell capacitor and said first cell terminal, where the second cell terminal is provided via the first or the second end of the cell capacitor;
a first chargeable power supply unit connected in parallel with the first switch; and
a second chargeable power supply unit connected in parallel with the second switch; and
a black start control unit configured to perform, after the initial application of a DC voltage to a cell terminal of a cell and the subsequent initial charging of the chargeable power supply unit of one of the switches, charging of an uncharged power supply unit of the other switch through repeatedly turning on and off the switch with the initially charged power supply unit.
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Accused Products
Abstract
A voltage source converter includes a black start control unit and cells, where each cell includes a first switch between a first end of a cell capacitor and a first cell terminal, a second switch between a second end of the cell capacitor and the first cell terminal, where a second cell terminal is provided via the first or the second end of the cell capacitor, a first power supply unit and a second power supply unit, where the black start control unit is configured to perform, after the initial application of a DC voltage to a cell terminal of a cell and the subsequent initial charging of the chargeable power supply unit of one of the switches, charging of an uncharged power supply unit of the other switch through repeatedly turning on and off the switch with initially charged power supply unit.
16 Citations
20 Claims
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1. A multilevel voltage source converter comprising:
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cells connected in cascade, each of the cells having; a first and a second cell terminal; a cell capacitor; a first switch between a first end of the cell capacitor and the first cell terminal; a second switch between a second end of the cell capacitor and said first cell terminal, where the second cell terminal is provided via the first or the second end of the cell capacitor; a first chargeable power supply unit connected in parallel with the first switch; and a second chargeable power supply unit connected in parallel with the second switch; and a black start control unit configured to perform, after the initial application of a DC voltage to a cell terminal of a cell and the subsequent initial charging of the chargeable power supply unit of one of the switches, charging of an uncharged power supply unit of the other switch through repeatedly turning on and off the switch with the initially charged power supply unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18, 19, 20)
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10. A method for energizing chargeable power supply units of cells of a multilevel voltage source converter, where each cell comprises:
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a first and a second cell terminal; a cell capacitor; a first switch between a first end of the cell capacitor and the first cell terminal; a second switch between a second end of the cell capacitor and the first cell terminal, where a second cell terminal is provided via the first or the second end of the cell capacitor; a first chargeable power supply unit connected in parallel with the first switch; and a second chargeable power supply unit connected in parallel with the second switch, said method comprising the step of; performing, after the initial application of a DC voltage to a cell terminal of a cell and the subsequent initial charging of the chargeable power supply unit of one of the switches, charging of an uncharged power supply unit of the other switch through repeatedly turning on and off the switch with the initially charged power supply unit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification