Power supply recovery method of power distribution network comprising distributed power supplies after fault

A technology for distributed power supply and distribution network faults, applied in electrical components, circuit devices, AC network circuits, etc. question

Inactive Publication Date: 2017-02-01
STATE GRID TIANJIN ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the power supply recovery process after the fault of the distributed power distribution network, the distributed power only operates in an isolated island with fixed loads, and does not consider the operation of the distributed power

Method used

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  • Power supply recovery method of power distribution network comprising distributed power supplies after fault
  • Power supply recovery method of power distribution network comprising distributed power supplies after fault
  • Power supply recovery method of power distribution network comprising distributed power supplies after fault

Examples

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Embodiment Construction

[0032] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0033] In this example, with figure 1 The distribution network system shown is taken as an example. The distribution network system is connected with two distributed power sources; among them, DG1 and DG2 are two distributed power sources; S is a distribution network substation; 2, 3, 4...14 are section switches, 15, 16 are circuit breakers on the distributed power supply side (black solid squares represent closed, hollow squares represent open); in general, the section switch Equipped with FTU, it can be remotely controlled on and off; (1), (2)...(9) are distribution transformers; · are distribution transformer switches.

[0034] A power supply recovery method after a fault in a distribution network including a distributed power supply, comprising the following steps:

[0035] Step 1. After a large-scale power outage occurs due to a fault in the...

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PUM

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Abstract

The invention relates to a power supply recovery method of a power distribution network comprising distributed power supplies after a fault. The power supply recovery method is technically characterized by comprising the following steps of (1) splitting the distributed power supply which does not have isolated island operation capability after a large-area power failure condition is caused by the fault of the power distribution network; (2) carrying out isolated island division by using a searching method on the basis of the principle that the distributed power supplies run with surrounding loads, and then enabling an isolated land, with the surrounding load, of the distributed power supply with the isolated island operation capability to run; (3) isolating a fault point and recovering power supply of the remaining sound network; and (4) enabling the distributed power supply or isolated island with a grid-connection condition to run in a grid-connection manner and enabling the isolated land without the grid-connection condition to further run. The effects of the distributed power supplies can be fully developed under the premise of recovering load power supply as much as possible; the important load power supply reliability is improved; meanwhile, the switching action frequency is reduced as few as possible in the power supply recovery process; and the network loss is reduced as much as possible after power supply recovery.

Description

technical field [0001] The invention belongs to the technical field of power distribution automation, in particular to a power supply recovery method after a fault in a power distribution network including a distributed power source. Background technique [0002] At present, when the distribution network containing distributed generation (DG) fails and a large-scale power outage occurs, the distributed generation is generally removed from the distribution network, and then the power supply is restored to the healthy area of ​​the distribution network, and finally the distributed generation is connected to the grid. However, this approach fails to give full play to the function of distributed power to improve power supply reliability. Therefore, when the distribution network fails and a large-scale power outage occurs, the distributed power with island operation capability will operate in isolated islands with surrounding loads, and does not have the distribution of island ope...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/38H02J3/388
Inventor 崇志强陈培育于光耀崔洁蒋菱项添春李国栋王旭东王峥王天昊黄志刚冯长有王永杰
Owner STATE GRID TIANJIN ELECTRIC POWER
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