Power distribution network fault handling method
A technology for distribution network faults and disposal methods, applied in the field of distribution networks, can solve problems such as short-term power failure, inapplicability, and inability to meet large-scale friendly access to distributed power sources, and achieve the effect of improving reliability.
Active Publication Date: 2020-04-17
NARI TECH CO LTD +1
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Problems solved by technology
First, open-loop operation affects the further improvement of power supply reliability
In the open-loop distribution network, even if the distribution automation transformation has been carried out, the switching operation of fault isolation and power restoration after the fault will still cause short-term power outages
Second, open-loop operation cannot meet the large-scale friendly access of distributed power
The fault location and recovery methods of traditional radial distribution network are not suitable for the flexible and direct interconnection ring network operation distribution network
Method used
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[0023] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0024] Such as figure 1 As shown, it is a flowchart of a distribution network fault handling method provided by an embodiment of the present invention, including the following steps:
[0025] First of all, before the failure, the main station system searches the connected area of the flexible direct control system in real time, and dynamically determines the load boundary switch according to the stable operation range, load status and switching conditions of the flexible direct control system. The specific method is as follows:
[0026] (1) According to the electrical connection, take the switching station as the unit, and calculate the active and reactive power of all loads in each switching...
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The invention discloses a power distribution network fault handling method. The method comprises the following steps that: a protection control device performs fault positioning and isolation according to a load boundary switch predetermined before a fault, remotely jumps a downstream boundary switch of a fault point and controls flexible direct current equipment to perform pulse sealing; after fault isolation, the protection control device uploads a fault isolation success signal to a main station system; and a flexible direct current control system controls a flexible direct current equipment port to be converted into a VF operation mode to supply power to a downstream non-fault area with a boundary switch, enables the main station system to carry out power loss area scanning, and carries out load transfer on the non-fault area between the downstream of a fault point and the operation boundary switch of the flexible direct current equipment. Aiming at the problem of fault handling ofthe looped network operation power distribution network based on flexible direct current interconnection, the capability of supplying power to a passive load by flexible direct current and the cooperative cooperation between the main station and the sub-station are fully utilized, power supply is rapidly recovered after a fault, and the power supply reliability of the power grid is improved.
Description
technical field [0001] The invention relates to a method for disposing of distribution network faults, belonging to the technical field of distribution networks. Background technique [0002] Due to cost and technical reasons, my country's distribution network has been mainly based on "closed-loop design and open-loop operation" for a long time. However, with the development of the economy and society and the gradual advancement of smart grid construction, especially when the urban distribution network is about to enter the stage of advanced distribution automation, the disadvantages of open-loop operation are gradually becoming prominent. First, open-loop operation affects the further improvement of power supply reliability. In an open-loop distribution network, even if the distribution automation transformation has been carried out, the switching operation of fault isolation and power restoration after a fault will still cause short-term power outages. Second, the open-l...
Claims
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IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/26H02J3/36Y02E60/60Y04S10/52
Inventor 黄素娟徐希闪鑫吴爽冯秋侠吴婧妤
Owner NARI TECH CO LTD