Effect of Terminal Fault on Transient Voltage Under Different Wind and Fire Ratio

In order to effectively solve the large-scale wind power transmission alone power absorption and instability, to counter China’s energy and load consumption present reverse distribution. The large-scale wind-fire power is delivered through UHVDC, but because of the long distance and the random intermittency of new energy, the possibility of transmission line failure is greatly increased. In this paper, a model of UHVDC delivery of wind-fire bundling is established, the effect of short circuit on commutation failure and the formation mechanism of transient voltage characteristics of the AC system at the receiving end are described, and the effects of different wind and fire ratio delivery scenarios are analyzed, the effect of different types of short circuit at the receiving end on the transient voltage. The simulation results show that the single-phase-to-ground fault will do more harm to the stable operation and fault recovery of power grid with the increase of the proportion of outside wind power, it is beneficial to new energy absorption and stable operation of the system.