Abstract
Abstract Existing microgrid protection methods suffer from false action or non-action due to the difficulty of wave head extraction. The time-domain expressions of voltage forward traveling wave for internal faults or external faults in microgrid are derived in this paper, and the exponential function coefficient characteristic of the fault voltage forward traveling wave is obtained: the maximum value of exponential function coefficient for the internal fault is greater than that of the external fault. Based on this, a novel microgrid protection method is proposed, which uses the exponential function coefficient characteristic of the fault voltage forward traveling wave. The exponential coefficients are accurately extracted using the Levenberg–Marquardt algorithm, and the fault identification of internal and external faults is determined based on the maximum value of the exponential function coefficients. The time window of the proposed method is 1 ms, which is only 10% of the time window of existing common protection methods using steady state, the speed of protection is enhanced. The simulation test results show that the proposed method is feasible and reliable in various operating states, fault locations, and fault types.
Published Version
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