FAULT CURRENT-SUPPRESSING DAMPER TOPOLOGY CIRCUIT AND CONTROL METHOD THEREOF AND CONVERTER

摘要

A fault current-suppressing damper topology circuit and a control method thereof, and a converter. An anode of a separate diode is connected with a positive electrode of a second switch module, a cathode of the separate diode is connected with one end of an energy storage capacitor, and the other end of the energy storage capacitor is connected with a negative electrode of a first switch module; a damping resistor is connected in parallel with a lightning arrester and then with the first switch module; a bypass switch is connected in parallel between a terminal x1 and a terminal x2 of the damper topology circuit; a power supply system acquires energy from the energy storage capacitor and supplies power to a control system; the control system controls the operating state of the damper topology circuit by controlling the bypass switch, the first switch module and the second switch module. The fault current-suppressing damper topology circuit is applied to voltage-source converters. In case of a direct current fault, stress resulting from fault currents is reduced by use of the damping resistor, thereby avoiding damages to devices and achieving self-power supply, modularization and independent control. The fault current-suppressing damper topology circuit can be flexibly applied to various types of voltage-source converters and also has outstanding economic efficiency and technicality.