Submodule identification in a modular multilevel converter by means of measuring signal propagation times from the central controller
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United States of America Patent
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Mar 27, 2018
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app pub date -
Sep 29, 2014
filing date -
Sep 30, 2013
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Abstract
An electrical apparatus comprises a chain-link converter which includes a plurality of chain-link sub-modules each of which is operable to provide a voltage source. The electrical apparatus also includes a switching control unit to control the chain-link sub-modules. The switching control unit is operatively interconnected with each chain-link sub-module by an electromagnetic radiation conduit. The length of the electromagnetic radiation conduit between the switching control unit and at least one chain-link sub-module differs from the length of the electromagnetic radiation conduit between the switching control unit and at least one other chain-link sub-module. The switching control unit is configured to discern a difference in the time taken for an electromagnetic signal to propagate through each different-length electromagnetic radiation conduit to thereby identify the or each chain-link sub-module associated with each different-length electromagnetic radiation conduit.
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