Power distribution network grounding fault protection method based on fuzzy measurement fusion criteria
A fuzzy measurement, distribution network technology, applied in the field of power system, can solve the problems of ground fault detection and protection, weak fault current, arc instability, etc., to broaden the fault judgment interval, avoid misjudgment, and improve robustness. Effect
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[0129] Using PSCAD / EMTDC simulation software to simulate and analyze a 35kV power distribution system, the simulation model is as follows Figure 4 shown. The system adopts the grounding mode of the neutral point through the arc suppression coil, and the bus is powered by a 110kV system through a △ / Y transformer.
[0130] Extract three kinds of steady-state fault feature quantities: zero-sequence impedance angle x k1 , Negative sequence current x k2 , zero sequence current x k3 , and three kinds of transient fault characteristic quantities: zero-sequence current db4 modulus maximum value x after wavelet transform k4 , Modulus maxima x after cubic B-spline wavelet transform k5 , the zero-sequence energy function value x in the half power frequency cycle after the fault starts k6 A total of 6 fault feature quantities are used as feature quantities for fuzzy cluster analysis. When the fault occurs on feeder 3 and feeder 4, the characteristic samples collected at the exit of...
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