Research on Fault Location Method Based on Nonlinear Impedance Model

In modeling and location analysis, most traditional fault location methods do not consider about the existence of practical nonlinear model in distribution network, such as the nonlinearity of load and grounding resistor. Hence, the adopted model can’t express the practical network, and the location results will lose practical meaning. Aiming at solving the question above, this paper proposes a fault area location method for distribution network with Distributed Generation (DG) which takes account of the nonlinearity; the load adopts quadric polynomial model; the grounding resistor adopts the experience formula model; the nonlinear equation constructed by nodal voltage equation will be solved out through quasi-newton algorithm, then the fault area can be located according to the definition of fault feature value. The simulation results in 10 kV distribution network model of the SINPOPEC West-Northern oil field suggest the validity of the proposed fault location method. 