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Urban power network power supply recovery method based on backup automatic switching of 10kV special feed line

A technology for urban power grid and power supply recovery, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem of 10kV feeder being unable to recover in time, and achieve the effect of short action time, fast power recovery, and safety assurance

Active Publication Date: 2016-04-20
CHENGDU POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a recovery method for power supply of urban power grids based on 10kV special feeder backup and automatic switching, and to solve the problem that the sudden power failure of 10kV feeder cannot be restored in time

Method used

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  • Urban power network power supply recovery method based on backup automatic switching of 10kV special feed line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] like figure 1 The shown method for restoring power supply of urban power grid based on 10kV special feeder backup and self-switching includes the following steps:

[0053] Step 1, capturing the bus voltage loss signal;

[0054] Step 2, carry out the determination criterion of pressure loss;

[0055] Step 3: After confirming the loss of voltage, the function of feeder backup automatic switching is started, and the safety isolation plan is obtained first by starting analysis; The time is 2S, and the action time of 10kV standby automatic switching is about 8S, and the city and county should reliably hide the maximum time.

[0056] Step 4, check the section;

[0057] Step 5, obtain the power supply scheme; the power supply scheme is based on priority for load transfer, and is determined according to the changing section, considering the load supply capacity of the opposite side line and the load supply situation of the main transformer;

[0058] Step 6: Execution mode, ...

Embodiment 2

[0065] like figure 1 In the shown method for recovering power supply of urban power grid based on 10kV special feeder backup and self-switching, in Step 2, on the basis of Embodiment 1, the criterion is: when a 10kV single or multiple busbars lose voltage is detected , the line voltage and phase voltage are both lower than the set value, which is 30% of the rated voltage; and the relevant main transformer main circuit and segment switch current, active power are all lower than the set value, the current is 6A, and the active power is 0.1MW.

[0066] The following situations lead to long-term voltage loss of 10kV bus:

[0067] 1) The system side trips, the station has no backup automatic switch (single power supply), the backup switch is withdrawn (as a transfer station), or the backup switch action is unsuccessful.

[0068] 2) If the main transformer in the station fails, the switches on each side are tripped, and the backup automatic switching of the 10kV bus is not put into...

Embodiment 3

[0075] like figure 1 In the shown method for recovering power supply of urban power grid based on 10kV special feeder backup and self-switching, in step 2, on the basis of embodiment 1, in step 4, the verification section needs to first carry out the corresponding plan stored in the system Verification, the content of verification mainly includes the following points:

[0076] 1) Check the correctness of the running mode

[0077] Since the current operation mode may be different from the operation mode of the plan storage, resulting in the failure of the plan execution, it is necessary to continue to compare the operation mode of the plan and the current operation mode, and the ones that are completely consistent will pass the mode verification;

[0078] 2) Correctness verification of power supply capability

[0079] The verification of power supply capacity is mainly to verify the power supply capacity of the power supply, so as to avoid the risk of secondary tripping due t...

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Abstract

The invention discloses an urban power network power supply recovery method based on backup automatic switching of a 10kV special feed line. The method comprises the following steps: step one, capturing bus under-voltage signals; step two, determining an under-voltage determination criterion; step three, after under-voltage determination is confirmed, starting a feed line backup automatic switching function, first of all, starting an analysis, and obtaining a safe isolation scheme; step four, verifying a section; step five, obtaining a power supply scheme, wherein the power supply scheme involves carrying out load transferring according to priorities and considering determining a side-line load supply capability and a main transformation load supply condition; step six, employing an execution mode comprising interactive execution and automatic execution, wherein the interactive execution involves pushing an interaction interface, executing operation by a dispatcher and then monitoring the operation by the dispatcher; step seven, when the automatic execution is employed, shielding monitoring remote control, and executing the safe isolation scheme; step eight, after the safe isolation scheme is successfully executed, executing a load transfer scheme; and step nine, after the load transfer scheme is successfully executed, displaying that processing ends on the interaction interface and recording a processing result.

Description

technical field [0001] The invention relates to the field of power supply, in particular to a recovery method for power supply of an urban power grid based on 10kV special feeder backup and automatic switching. Background technique [0002] When one or more 10kV buses lose voltage and cause a large-scale fault, and the high-voltage side of the substation cannot recover the voltage-loss bus failure in time, the operator will manually restore the power supply, which will cause a large-scale and long-term power outage in the distribution network. Although the probability of causing a 10KV bus voltage loss failure is small, it will cause great harm to large-scale power outages. Therefore, when the busbar loses voltage, it is considered to start the feeder standby self-switching function to perform safe isolation and quickly recover from power failure. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to p...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/0073
Inventor 陈立刘宇郝昱张剑平冯智博潘睿王禺马莉张子健丁知晓
Owner CHENGDU POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER
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