Self-healing method of 110kV transformer station hand-in-hand power supply

Abstract

The invention relates to a self-healing method of 110kV transformer station hand-in-hand power supply, aiming at performing network reconstruction to recover power supply when power failure occurs in a plurality of main transformers at the same time for a 110kV transformer station hand-in-hand power supply loop. The self-healing method of 110kV transformer station hand-in-hand power supply includes the following steps: 1) constructing a 110kV transformer station hand-in-hand power supply self-healing system; 2) utilizing the self-healing system to acquire a breaker position signal, an alternating current and voltage and a line protection motion semaphore of each 110kV line on the whole loop in real time; and 3) when power failure occurs in the plurality of main transformers at the same time because the 110kV transformer station hand-in-hand power supply loop malfunctions, and when segmental auto-switching in the 110kV transformer station fails to actuate, making a decision and sending out a control command to perform network reconstruction by the self-healing system, isolating the position where the fault occurs to guarantee power supply. Compared with the prior art, the self-healing method of 110kV transformer station hand-in-hand power supply has the advantages of guaranteeing safety of power supply, and being adaptive to various fault types.

Description

technical field [0001] The invention relates to the field of substation safety, in particular to a self-healing method for hand-in-hand power supply in 110kV substations. Background technique [0002] Such as figure 1 As shown in the figure, the structure diagram of the 110kV substation hand-in-hand power supply mode is shown, with 220kV power stations A and B on both sides, and three 110kV substations C, D, and E in the middle. During normal operation, there are 2 power supply ring networks, namely A1-C1-C2-D1-D2-E1-E2-B1 and A2-C4-C5-D4-D5-E4-E5-B2, all 220kV and 110kV stations The sectional switch is disconnected during normal operation, and the sectional self-cutting preparation is in progress. C2 and C5 are disconnected during normal operation, as the bus tie switch of the two power supply ring networks. [0003] 110kV hand-in-hand power supply network on both sides. During normal operation, both sides of the power supply supply power at the same time. There is a dis...

AI Technical Summary

Problems solved by technology

[0004] (1) The two main transformers in the same 110kV substation are powered by the same 220kV substation, and the power outage of the 220kV substation causes the power outage of the 110kV substation, figure 1 A full stop at Station A will cause power outage at Station C;

[0005] (2) The two 110kV lines on the power supply side of the two main transformers in the same 110kV station are faulty, causing the 110kV station to lose power. figure 1 Both B1-E2 and E4-D5 lines are faulty

[0006] The above situation caused the power outage of two main transformers in the 110kV station at the same time, which would also cut off the power in the non-faulty area, prolonging the power outage time in the non-faulty area and expanding the scope of the accident.

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