CPC H02H 7/268 (2013.01) [H02J 3/36 (2013.01)] | 15 Claims |
1. An electronic valve apparatus for a high voltage direct current, HVDC, power transmission system, comprising:
a first device chain including a plurality of first devices connected in series between an input node and an output node of the electronic valve apparatus, each of the plurality of first devices having an asymmetric transfer function configured substantially to block current flow through the device in a first direction while allowing current to flow with low impedance in the other direction, wherein the plurality of first devices are connected such that they all block current flow in the same direction;
a second device chain including a plurality of second devices connected in series between the input node and the output node, each of the plurality of second devices having an asymmetric transfer function configured substantially to block current flow through the device in the first direction while allowing current to flow with low impedance in the other direction, wherein the plurality of second devices are connected such that they all block current flow in the same direction;
wherein the second device chain is connected in parallel with the first device chain.
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