DC to DC converter assembly
First Claim
1. A DC to DC converter assembly for connecting first and second high voltage DC power transmission networks, comprising:
- first and second modular multilevel converters each modular multilevel converter including;
first and second terminals connectable in use to a respective one of the first and second high voltage DC power transmission networks;
a first converter limb extending between the first and second terminals of the modular multilevel converter and having first and second limb portions, the first and second limb portions in the first converter limb separated by a third terminal of the modular multilevel converter, each first and second limb portions in the first converter limb including at least one module switchable to selectively provide a voltage source and thereby vary the ratio of a magnitude of a DC voltage (V1, V2) across the first and second terminals of the modular multilevel converter and a magnitude of an AC voltage (VAC) synthesized at the third terminal of the modular multilevel converter, wherein the at least one module includes at least one set of series-connected switching elements connected in a parallel with at least one energy storage device;
wherein the DC to DC converter assembly further includes a first direct link directly connecting the third terminal of one of the modular multilevel converter with the third terminal of the other modular multilevel converter; and
at least one of the modular multilevel converters further including a controller configured to switch the first and second limb portions in the first converter limb of said at least one modular multilevel converter into simultaneous conduction to divert a portion (IDiV1) of current flowing within said at least one modular multilevel converter away from the first direct link.
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Accused Products
Abstract
A DC to DC converter assembly, for connecting first and second high voltage DC power transmission networks, comprising first and second modular multilevel converters, each converter including a first converter limb having first and second limb portions, each limb portion including a least one module switchable to selectively provide a voltage source and thereby vary the magnitude ratio of a DC voltage (V1, V2) across the first and second terminals of a respective converter and an AC voltage (VAC) at the third terminal of the corresponding converter, the DC to DC converter assembly further including a first link electrically connecting the third terminal of one converter, with the third terminal of the other converter, and at least one converter further including a controller configured to switch the first and second limb portions in the first converter limb of the said converter into simultaneous conduction to divert a portion (IDiV1) of current flowing within the said converter away from the first link.
122 Citations
14 Claims
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1. A DC to DC converter assembly for connecting first and second high voltage DC power transmission networks, comprising:
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first and second modular multilevel converters each modular multilevel converter including; first and second terminals connectable in use to a respective one of the first and second high voltage DC power transmission networks; a first converter limb extending between the first and second terminals of the modular multilevel converter and having first and second limb portions, the first and second limb portions in the first converter limb separated by a third terminal of the modular multilevel converter, each first and second limb portions in the first converter limb including at least one module switchable to selectively provide a voltage source and thereby vary the ratio of a magnitude of a DC voltage (V1, V2) across the first and second terminals of the modular multilevel converter and a magnitude of an AC voltage (VAC) synthesized at the third terminal of the modular multilevel converter, wherein the at least one module includes at least one set of series-connected switching elements connected in a parallel with at least one energy storage device; wherein the DC to DC converter assembly further includes a first direct link directly connecting the third terminal of one of the modular multilevel converter with the third terminal of the other modular multilevel converter; and at least one of the modular multilevel converters further including a controller configured to switch the first and second limb portions in the first converter limb of said at least one modular multilevel converter into simultaneous conduction to divert a portion (IDiV1) of current flowing within said at least one modular multilevel converter away from the first direct link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification