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Power system for preventing spare power automatic switching from being switched on fault bus and control method thereof

A technology of power system and control method, which is applied in the field of power system, and can solve problems such as high equipment maintenance costs, long-term power outage repair, system impact, etc.

Active Publication Date: 2021-03-30
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]Because the fault occurred on the busbar, the backup line was connected to the faulty busbar, causing another impact on the failed busbar
Especially for GIS busbar equipment, once it is faulty and damaged, it needs a long-term power outage to repair, resulting in large-scale long-term power outages for users and high equipment maintenance costs.
[0009] To sum up, busbar faults occur from time to time. When the busbar loses voltage due to a fault, the logic of the existing standby automatic switching device cannot identify whether it is a busbar fault or a line fault. The backup power is often closed on the faulty bus, causing another impact on the system and further damage to the faulty bus

Method used

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  • Power system for preventing spare power automatic switching from being switched on fault bus and control method thereof
  • Power system for preventing spare power automatic switching from being switched on fault bus and control method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0048] figure 2 It is a schematic structural diagram of a power system used to prevent automatic switching on a faulty bus provided by Embodiment 1 of the present invention. see figure 2 , the power system used to prevent the standby automatic switch from closing on the fault bus includes:

[0049] The bus bar 10 on the power supply side and the bus bar 20 on the weak feed side;

[0050] The main supply line connected between the power supply side bus 10 and the weak feed side bus 20, the main supply line includes a first switch 1DL and a second switch 2DL connected in series, the first switch 1DL is a power supply side switch, and the second switch 2DL is Weak feed side switch;

[0051]A backup line connected in parallel with the main power supply line, the backup line includes a third switch 3DL and a fourth switch 4DL connected in series, the third switch 3DL is a power supply side switch, and the fourth switch 4DL is a weak feed side switch;

[0052] The first voltag...

Embodiment 2

[0067] Embodiment 2 of the present invention provides a control method for preventing the automatic switch-on of the standby power system from closing on the faulty bus. The control method can be applied to the power system provided by any embodiment of the present invention for preventing the automatic switching on of the faulty busbar. The control method includes the following steps:

[0068] Step 1. If the fault of the power system is a fault in the bus area, the main protection of the protection device on the power supply side does not operate, and the backup protection (distance 2, zero sequence 2) operates. In the first time limit, the protection device on the power supply side sends a remote trip command to the protection device on the weak feeder side.

[0069] Among them, the fault in the bus area belongs to the fault outside the line protection area (fault in the non-line area), for example, a bus fault, a bus knife switch fault or a vicious misoperation. The prote...

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Abstract

The embodiment of the invention discloses a power system for preventing spare power automatic switching from being switched on a fault bus and a control method thereof. The power system comprises a power supply side protection device, a weak feed side protection device and a spare power automatic switching device. The power supply side protection device is connected with the weak feed side protection device, and the weak feed side protection device is connected with the spare power automatic switching device; and the power supply side protection device, the weak feedback side protection deviceand the spare power automatic switching device are used for protecting the power system and preventing the spare power automatic switching device from being switched on a fault bus. Compared with theprior art, the embodiment of the invention is favorable for preventing the spare power automatic switching device from being switched on the fault bus, thereby preventing the spare power automatic switching device from being switched on the fault bus to cause heavy loss and consequences.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of electric power systems, and in particular to a power system and a control method thereof for preventing standby automatic switch-on from closing on a faulty bus. Background technique [0002] The backup power automatic input device (abbreviated as standby automatic input device) is an important equipment in the power system to improve the reliability of power supply. However, the existing standby automatic switching logic cannot judge whether the fault occurs on the bus, and often connects the backup power supply to the faulty bus, causing re-shock and damage to the system and the failed bus equipment. [0003] refer to figure 1 , when the weak-feed side bus fails, the actions of related equipment are as follows: [0004] 1. The backup protection on the opposite side of the main supply line (distance II section, zero sequence II section) operates, and the first switch 1DL is trippe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22H02H7/26H02H3/06H02H1/00H02J3/00
CPCH02H7/22H02H7/262H02H7/263H02H3/066H02H1/0007H02J3/0073Y04S20/12Y02B70/30Y04S20/248
Inventor 倪苗升陈晓彬孙玉彤魏旭佳孙旭李暖群
Owner GUANGDONG POWER GRID CO LTD