IMPROVEMENTS IN OR RELATING TO CONVERTERS FOR USE IN HIGH VOLTAGE DIRECT CURRENT POWER TRANSMISSION
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United States of America Patent
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Issued Date -
Oct 27, 2016
app pub date -
Dec 12, 2014
filing date -
Dec 12, 2013
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Abstract
In the field of high voltage direct current (HVDC) power transmission, a converter comprises three converter limbs, each corresponding to a respective phase of the converter, each extending between first and second DC terminals and each including first and second limb portions separated by an AC terminal. Each limb portion includes a chain-link converter that is operable to provide a stepped variable voltage source, and a primary switching element to selectively switch the respective limb portion into and out of circuit. The converter also includes a first controller that is programmed to selectively operate for one converter limb at a time the primary switching element in each limb portion thereof to simultaneously switch both the first and second limb portions into circuit and thereby define a fully-conducting converter limb to sequentially route via each said fully-conducting converter limb a DC current demand (IDC) between the first and second DC terminals.
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