Longitudinal differential protection scheme for inverter interfaced distributed generator teed line
An inverter-type distributed, longitudinal differential protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of reducing the reliability of longitudinal differential protection, reduce the cost of transformation and improve reliability. Effect
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[0020] The technical solution of the invention will be described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.
[0021] This embodiment takes figure 1 The structure diagram shown is an example. The line AB in the figure is a line connected to an inverter distributed power supply. The system voltage level is 110kV. The phase angle difference of the power supply potentials on both sides of the system is 50°. The positive sequence impedance of the line is: Z= 0.21+0.419Ω / km, line susceptance: b 0 =2×10-6S / km. The lengths of lines AM, AT, BT, and BN are 30km, 30km, 15km, and 45km, respectively. The rated capacity of the inverter type distributed power supply is 30MW. The fault location is selected within the protection range of k 1 points and k outside the protection range 2 point, k 1 The distance between the point and the grid-connected point T of the inverter distributed power generation is 10km, k 2 The distance bet...
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