Power frequency variation direction protection improvement method suitable for UPFC access
A power frequency variation and direction protection technology, which is applied in the direction of measuring electrical variables, measuring electricity, and measuring devices, can solve problems such as protection refusal, UPFC line direction protection misoperation, power frequency fault component protection reverse direction misoperation, etc. , to achieve simple and easy investment, and to solve the effect of wrong judgment of fault direction
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[0105] figure 1 The AC line voltage level is 500kV, the transformation ratio of the parallel transformer is 505 / 36 / 94kV, and the capacity is 300MVA, the transformation ratio of the series transformer is 43.5 / 105 / 10kV, the capacity is 300MVA, the line unit length resistance is 0.00003213Ω / m, the unit length The reactance is 0.002865Ω / m. The maximum sensitive angle θ sen Take it as 85°.
[0106] (1) The division results of the sensitive area and insensitive area of forward and reverse direction action areas are as follows Figure 6 Shown:
[0107] (2) θ P , θ L The membership function λ of the positive direction action area 1 , lambda 2 Schematic (such as Figure 4 shown) as follows:
[0108] Among them, C 1 =175°,C 2 =235°,C 3 =295°,C 4 =355°
[0109] Membership function λ 1 , lambda 2 The expression is as follows:
[0110]
[0111] (3) θ P , θ L Membership function λ of the action area in the opposite direction 3 , lambda 4 Schematic (such as Figur...
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