Short-circuit Fault Location method for Smart Distribution Network Considering load estimation

As more and more DGs plugging into low voltage side of the distribution network, the traditional distribution network is transformed from single-supply radial network to multi source network, which makes the overcurrent protection cannot be reliably realized by traditional protection devices and theories. Based on the application of synchronous phasor measurement technology in the smart distribution network, this paper analyzes the characteristics of the current phase difference in the sections with loads or branch lines quantitatively. Based on the above, this paper then proposes a novel auto-adaptive fault location and monitoring method based on section load estimation. At the same time, this paper analyzes the impact of different load types on the proposed fault location method. Verification of the proposed method has been carried out by simulating in the PSCAD, and the simulation results indicate that the short-circuit faults can be located and recognized accurately with fast speed and self-adaption.