Importance

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Abstract

A sub-module for a modular multi-level converter, a converter comprising the sub-module, and an application thereof. The sub-module comprises a first switching module (1), a second switching module (2), a direct current capacitor (4), and a third switching module (3). The first switching module (1) and the second switching module (2) are connected in series, a negative end of the first switching module (1) is connected to a positive end of the second switching module (2), and the switching modules (1, 2, 3) are each formed by connecting a full-controlled device and a diode in an antiparallel mode. A positive electrode and a negative electrode of the direct current capacitor (4) are connected to a positive end of the first switching module (1) and a negative end of the second switching module (2). The third switching module (3) is electrically connected to the first switching module (1) and the second switching module (2), so that a full-controlled device of the third switching module (3) applies trigger pulse all the time during normal operation and is in a conducting state all the time, and can be locked by locking the trigger pulse of the third switching module (3) when direct current faults occur. By means of the solution, a function of isolating the direct current faults is achieved, quantity and switching losses of fully-controllable devices in the sub-module are decreased, and requirements on trigger simultaneity are reduced.

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First Claim