In this paper

a fault location method for the petal-shaped distribution network (PSDN) with inverter-interfaced distributed generators (IIDGs) is proposed to shorten the time of manual inspection. In order to calculate the fault position

the closed-loop structure of the PSDN is skillfully exploited

and the common control strategies of IIDGs are considered. For asymmetrical faults

a fault line identification formula based on the negative-sequence current phase differences is presented

and a fault location formula only utilizing the negative-sequence current amplitudes is derived to calculated the fault position. For symmetrical faults

the positive-sequence current at both ends of lines and the current output from IIDGs are used to identify the fault line

and the positive-sequence current on multiple lines are used to pinpoint the fault position. In this method

corresponding current phasors are separated into amplitudes and phases to satisfy the limitation of communication level. The simulation results show that the error is generally less than 1%

and the accuracy of the proposed method is not affected by the fault type

fault position

fault resistance

load current

and the IIDG penetration.