SYSTEMS AND METHODS FOR ENHANCED OPERATION AND PROTECTION OF POWER CONVERTERS

摘要

An electrical system (100;200;300) includes an AC power source (102) and a power converter (120) including at least one first terminal (156;158) and at least one second terminal (159). The first terminal is configured to receive voltages with a DC component and the second terminal is configured to receive voltages that have a non-zero time average value including AC and DC components. The electrical system also includes an AC power transmission subsystem (110;210;310) coupled to and extending between the AC power source and the power converter. The electrical system further includes a current diversion system (150;250;350) including a plurality of first switching devices (160;260;360) coupled to the AC power transmission subsystem. The current diversion system also includes a second switching device (170) including a third terminal (172) coupled to the first terminal and a fourth terminal (174) coupled to the second terminal. The second switching device is configured to transmit current only from the third terminal to the fourth terminal.