A method and system for identifying grounding and phase-to-phase faults in a microgrid
A technology of interphase fault and identification method, applied in short-circuit test, continuity test and other directions, can solve the problems of slow operation speed, low reliability and insufficient sensitivity of microgrid, so as to improve the operation speed, solve the lack of sensitivity, and improve the operation speed The effect of reliability
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[0050] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0051] The first aspect: if figure 1 , discloses a method for identifying microgrid grounding and phase-to-phase faults, the method comprising the following steps:
[0052] Step 1: Based on the negative-sequence electrical quantity being the fault characteristic quantity, collect the sampled current value and sampled voltage value of the measured point, and calculate the negative-sequence power frequency mutation value, negative-sequence voltage power-frequency mutation value, and negative-sequence current power frequency mutation value. Mutation value; the specific calculation method is as follows:
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[0056] In the above formula is the phase a voltage at the current sampling time, is the b-phase voltage at ...
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