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Failure accurate positioning method for petal type power distribution network containing inverter distributed power supply

An inverter-type distributed distribution network fault technology, applied in the direction of fault location, etc., can solve problems such as the failure of fault location methods, and achieve the effect of simple, effective and accurate positioning, simple method, and less communication traffic

Pending Publication Date: 2022-07-01
TIANJIN UNIV +2
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent considers the impact of distributed power access, but this method can only locate ground faults. When a three-phase fault or phase-to-phase fault occurs in the distribution network, the current does not contain zero-sequence components. At this time, the fault location method failure

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  • Failure accurate positioning method for petal type power distribution network containing inverter distributed power supply
  • Failure accurate positioning method for petal type power distribution network containing inverter distributed power supply
  • Failure accurate positioning method for petal type power distribution network containing inverter distributed power supply

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Embodiment Construction

[0069] The present invention will be further described in detail below through specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0070] In the context of the dual carbon goal, the petal-type distribution network provides a more reliable grid connection condition for the access of a large number of new energy sources. In order to realize the precise fault location of the petal-type distribution network with the inverter-type distributed power supply, the present invention fully excavates and utilizes the flow through each branch on the main line based on the asymmetric fault and symmetrical fault analysis of the petal-type distribution network. Based on the characteristics of negative sequence current and positive sequence current of the line, a new method is proposed to quickly and accurately locate faults according to the negative sequence current and positive sequence current of e...

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Abstract

The invention relates to an accurate fault positioning method for a petal-type power distribution network containing an inverter distributed power supply, and the method comprises the steps: carrying out the fault characteristic analysis of the petal-type power distribution network containing the inverter distributed power supply, and carrying out the fault positioning of the petal-type power distribution network containing the inverter distributed power supply through employing a current incidence relation between two ends of a main line of a single petal ring network and a same bus, a foundation is laid for simply, effectively and accurately positioning a fault position; secondly, no matter a symmetric fault or an asymmetric fault occurs, the method can accurately realize fault positioning, and is not influenced by a fault type, an inversion type distributed power supply and a transition resistor; and finally, accurate fault positioning can be realized only after the centralized information processing center receives the positive sequence and negative sequence current steady-state values of each protection on the main line, a traveling wave measuring device and the like do not need to be additionally arranged, and the method has the characteristics of small required communication traffic, low information synchronism requirement and the like, and is reliable in performance, simple and easy to implement.

Description

technical field [0001] The invention belongs to the field of power system distribution network protection and control, and based on the analysis results of the fault characteristics of the petal-type distribution network, in particular relates to a fault accurate location method suitable for the petal-type distribution network with inverter-type distributed power sources. Background technique [0002] The distribution network in my country usually adopts the radial grid structure of "closed-loop design and open-loop operation". However, this kind of grid structure has problems such as large fault influence range and long power outage time, which makes it difficult to meet the increasing power supply demand. Compared with the open-loop radial distribution network, the closed-loop petal-type distribution network has the advantages of uninterrupted maintenance, flexible and diverse operation control strategies, and high economic benefits. [0003] With the establishment of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 陈晓龙袁姝李永丽李斌李仲青杨国生任江波蒋帅耿少博常风然王强何亚坤
Owner TIANJIN UNIV
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