Abstract
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.
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