Patent ID: 11933835

Abstract:
The present invention relates to the technical field of fault location of distributed energy resources connected flexible DC distribution network, and disclosed a fault location method, system and application of bipolar short-circuit of two-level VSC-type photovoltaic-connected flexible DC distribution network, wherein, directions of positive currents of DC feeders during fault are used to locate a fault section; a bipolar short-circuit distance measurement model covering interactions and responses of systems is established according to equivalent circuits of transient periods; and fault location is done by obtaining a distance to fault with electric parameters and information of the fault. With the technical solutions offered in the present invention, accurate location of the fault can be done with the electric parameters and information of the fault, a key technology is provided for quick location of bipolar short-circuit of flexible DC distribution network, power supply reliability of the system is further improved, errors due to differentiation of the conventional distance measurement methods are effectively avoided, the location results are more accurate and of high stability, in this way, further development of flexible DC distribution network can be promoted and building of a new power system in the background of energy transition is facilitated.