Hybrid AC/DC converter for HVDC applications
First Claim
1. A power electronic converter, for connecting AC and DC networks and transferring power there between, comprising:
- first and second DC terminals for connection in use to a DC network;
a plurality of converter limbs compatible with an AC multi-phase network having a corresponding number of phases, among the plurality of converter limbs, at least one primary converter limb and at least one secondary converter limb being provided,each of the at least one primary converter limb extending between the first and second DC terminals and having first and second primary limb portions separated by a corresponding primary AC terminal for connection in use to a respective phase of the multi-phase AC network, at least one of the first and second primary limb portions including at least one primary active switching module to selectively allow current to flow through each of the at least one primary converter limb in a first direction from the corresponding primary AC terminal to the first and second DC terminals and in a second direction from the first and second DC terminals to the corresponding primary AC terminal, further each of the at least one of the first and second primary limb portions including at least one primary active switching element connected in series with each of the at least one primary active switching module; and
each of the at least one secondary converter limb extending between the first and second DC terminals and having first and second secondary limb portions separated by a corresponding secondary AC terminal for connection in use to a further respective phase of the multi-phase AC network, each of the first and second secondary limb portions including at least one diode to limit current flow through each of the at least one secondary converter limb to a single direction from the corresponding secondary AC terminal to the first and second DC terminals;
a primary controller to selectively switch each of the at least one primary active switching module, the primary controller being configured to switch each of the at least one primary active switching module in a AC to DC power transfer mode and in a DC to AC power transfer mode, wherein the primary controller when operating in a DC to AC power transfer mode selectively switches each of the at least one primary active switching module in each of the at least one primary converter limb to synthesise a primary AC waveform at the corresponding primary AC terminal, the primary AC waveform at the corresponding primary AC terminal having a configuration which inhibits the synthesis of a secondary AC waveform at the corresponding second AC terminal of each of the at least one secondary converter limb, the power electronic converter having a full power transfer functionality from the AC network to the DC network and a reduced power transfer functionality from the DC network to the AC network,wherein each of the at least one primary switching module includes one or more sets of series-connected primary active switching elements connected in parallel with an energy storage device to selectively provide a voltage source.
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Accused Products
Abstract
A power electronic converter, for connecting AC and DC networks and transferring power therebetween, comprises: first and second DC terminals for connection in use to a DC network; at least one primary converter limb extending between the first and second DC terminals and having first and second primary limb portions separated by a primary AC terminal for connection in use to a respective phase of a multi-phase AC network, at least one of the first and second primary limb portions including at least one primary active switching module to selectively allow current to flow through the corresponding primary converter limb in a first direction from the corresponding primary AC terminal to the DC terminals and in a second direction from the DC terminals to the corresponding primary AC terminal; and at least one secondary converter limb extending between the first and second DC terminals and having first and second secondary limb portions separated by a secondary AC terminal for connection in use to a further respective phase of the said multi-phase AC network, each of the first and second secondary limb portions including at least one passive current check element to limit current flow through the corresponding secondary converter limb to a single direction from the corresponding secondary AC terminal to the DC terminals.
121 Citations
9 Claims
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1. A power electronic converter, for connecting AC and DC networks and transferring power there between, comprising:
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first and second DC terminals for connection in use to a DC network; a plurality of converter limbs compatible with an AC multi-phase network having a corresponding number of phases, among the plurality of converter limbs, at least one primary converter limb and at least one secondary converter limb being provided, each of the at least one primary converter limb extending between the first and second DC terminals and having first and second primary limb portions separated by a corresponding primary AC terminal for connection in use to a respective phase of the multi-phase AC network, at least one of the first and second primary limb portions including at least one primary active switching module to selectively allow current to flow through each of the at least one primary converter limb in a first direction from the corresponding primary AC terminal to the first and second DC terminals and in a second direction from the first and second DC terminals to the corresponding primary AC terminal, further each of the at least one of the first and second primary limb portions including at least one primary active switching element connected in series with each of the at least one primary active switching module; and each of the at least one secondary converter limb extending between the first and second DC terminals and having first and second secondary limb portions separated by a corresponding secondary AC terminal for connection in use to a further respective phase of the multi-phase AC network, each of the first and second secondary limb portions including at least one diode to limit current flow through each of the at least one secondary converter limb to a single direction from the corresponding secondary AC terminal to the first and second DC terminals; a primary controller to selectively switch each of the at least one primary active switching module, the primary controller being configured to switch each of the at least one primary active switching module in a AC to DC power transfer mode and in a DC to AC power transfer mode, wherein the primary controller when operating in a DC to AC power transfer mode selectively switches each of the at least one primary active switching module in each of the at least one primary converter limb to synthesise a primary AC waveform at the corresponding primary AC terminal, the primary AC waveform at the corresponding primary AC terminal having a configuration which inhibits the synthesis of a secondary AC waveform at the corresponding second AC terminal of each of the at least one secondary converter limb, the power electronic converter having a full power transfer functionality from the AC network to the DC network and a reduced power transfer functionality from the DC network to the AC network, wherein each of the at least one primary switching module includes one or more sets of series-connected primary active switching elements connected in parallel with an energy storage device to selectively provide a voltage source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification