WPAT, PC
Grounding fault protection method for high-voltage capacitor of direct-current filter
The invention relates to a grounding fault protection method for a high-voltage capacitor of a direct-current filter. The method comprises the following steps of acquiring a head end voltage u and an unbalanced current iT2 of a direct-current filter, and acquiring a discrete head end voltage and unbalanced current sequence; calculating a virtual capacitance Czd; determining a protection setting value Cset according to the bridge arm capacitance of the high-voltage capacitor, and when the virtual capacitance Czd is larger than the protection setting value Cset, protecting and judging to be an internal fault; otherwise, protecting and judging to be an external fault.
TIANJIN UNIVERSITY
H H
H02H H02H
inventional inventional
Yongli Jinzhao Yunke
Li Song Zhang