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Protection method for novel active power distribution network

A distribution network, a new type of technology, applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc., can solve problems such as frequency deviation on the wind power side, achieve the effect of protecting the entire length of the line and solving the impact of frequency deviation

Pending Publication Date: 2022-03-25
DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a protection method for a new type of active distribution network, which solves the influence of frequency offset on the wind power side and protects the entire length of the line of the active distribution network

Method used

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  • Protection method for novel active power distribution network
  • Protection method for novel active power distribution network
  • Protection method for novel active power distribution network

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] 1: First, measure the components for data collection, and collect the fault voltage and fault current.

[0036] 2: Calculate the measured impedance of the system side and the wind farm respectively according to U / I.

[0037] 3: Then calculate the information entropy of the measured impedance on the system side and the wind farm side respectively according to the measured impedance; if the conditions are met, the protection enters the next procedure; oth...

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Abstract

The invention provides a protection method for a novel active power distribution network, and the method comprises the steps: deducing an expression of the measurement impedance of a new energy source and a synchronous power supply, and obtaining the influence of a new energy power supply on fault resistance and distance protection; then calculating the information entropy of the measured impedance at the two sides of the line, and selecting a fault identification criterion according to the result of the information entropy; and finally calculating the mahalanobis distance between the measured impedances on the two sides of the line, and identifying internal and external faults according to the result. The problem that an existing distance protection scheme is affected by frequency shift characteristics is solved, and the whole length of a line can be protected.

Description

technical field [0001] The invention relates to a protection method for a novel active distribution network, belonging to the technical field of active distribution networks. Background technique [0002] Increasing the development and utilization of new energy is one of the effective means to achieve the "double carbon" goal. In the future, my country's power transmission / distribution system will be heavily connected to new energy sources such as wind power, photovoltaics, and hydropower. However, the widespread access of a large number of distributed energy sources has changed the topology and fault characteristics of the existing grid. This kind of topological structure for absorbing new energy is called active distribution network. Taking the active distribution network as an example, the topology of the traditional distribution network is a typical structure in which a single source flows to the load. However, the access of new energy sources such as wind power has c...

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Application Information

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IPC IPC(8): H02H7/26H02H1/00H02J3/38
CPCH02H7/262H02H7/263H02H1/0007H02J3/381H02J2203/20H02J2300/28
Inventor 房牧刘春秀曹清涛刘璇李龙潭刘志刚周在彦王朋朋张玉琪刘奕敏
Owner DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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