Analysis and simulation of UPFC device on power flow optimization and suppression of short-circuit faults of network transmission line

With the gradual expansion of the scale of new energy grid connection and the improvement of the level of residential power consumption, the regional grid load has shown an intensive and rapid growth, which results in an increase in the electrical distance of the transmission line. And the line is likely to cause phenomena such as power flow exceeding or under working conditions. Therefore, it is necessary to install power electronic devices to realize functions such as power flow regulation and reactive power compensation, and to improve the transmission efficiency of the grid. This article first introduces the working principle of the UPFC device and then analyses the current common engineering application examples of the UPFC. Finally, a simulation model of the loop network is carried out, and conducts the power flow calculation and short circuit experiment, The results show that the UPFC device has obvious effects on improving the line power flow and suppressing fault of short circuits.