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Method for positioning low-frequency oscillation source based on graph theory

A low-frequency oscillation, source location technology, applied in the direction of reducing/preventing power oscillation, fault location, detecting faults by conductor type, etc., can solve the problem of difficult oscillation source location, etc.

Pending Publication Date: 2017-05-10
NANJING NARI GROUP CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing oscillation source location methods are often helpless for the characteristics of "missing unit information and complete line information" in the network commissioning information, and it is difficult to apply to the oscillation source location of the inter-regional oscillation mode

Method used

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  • Method for positioning low-frequency oscillation source based on graph theory
  • Method for positioning low-frequency oscillation source based on graph theory
  • Method for positioning low-frequency oscillation source based on graph theory

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Embodiment Construction

[0066] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0067] A cut set is a group of branches that can divide a connected network into two connected subnets, and the two subnets are connected through the branches contained in the cut set. By judging the energy flow direction of the cut set connecting the subnet and the external network, it can be judged whether the oscillation source is located in the subnet. Such as figure 1 As shown, the dotted line box is subnetwork 1, and the lines a-b, a-c, f-e constitute the cut set Ω that separates subnetwork 1 from other parts of the network. When there is an oscillation source in subnetwork 1, it will If there is energy outflow, the sum of the oscillating energy flow on the line contained in the cut set Ω is the energy sent by subnetwork 1, which is called the cut set energy, and the cut set with the largest energy in all cut sets is defined as the maximum oscillating energy fl...

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Abstract

The invention provides a method for positioning a low-frequency oscillation source based on a graph theory. The method comprises the steps of building a power grid weighted adjacent matrix, determining a line Lmax where a maximum oscillation energy flow is located, solving front K shortest paths of the line Lmax by using multiple labeling methods so as to acquire a path line set Lines, traversing in the path line set Lines to determine a maximum oscillation energy flow cut set, determining whether a K-value is corrected or not, and determining a region where the oscillation source is located according to the maximum oscillation energy cut set. According to the technical scheme provided by the invention, the region where the oscillation source is located is positioned by using the maximum oscillation energy cut set, the number of applied electrical variables is small, and only real-time information of the lines is acquired in application, so that a problem of information loss of a unit is solved, and increase in time cost caused by using state estimation is avoided. Meanwhile, the method is also applicable to a circumstance that the oscillation source is not a unit, so that the applicability in disturbance source positioning is improved.

Description

technical field [0001] The invention relates to the location of oscillation sources in power systems, in particular to a method for locating low-frequency oscillation sources based on graph theory. Background technique [0002] In recent years, the phenomenon of low-frequency oscillation has appeared many times in the domestic power grid, and has become a prominent problem that threatens the safe and stable operation of the interconnected large power grid. [0003] With the rapid development of the electric power industry and the continuous expansion of the scale of the interconnected power system of large regional power grids, the problem of dynamic stability of the power system has become increasingly prominent in the transitional stage of rapid power development, and the problem of low-frequency oscillation is affecting the safe and stable operation of the power grid. When low-frequency oscillation occurs, it is required to accurately and quickly locate the oscillation so...

Claims

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Application Information

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IPC IPC(8): H02J3/24G01R31/08
CPCH02J3/24G01R31/085G01R31/088
Inventor 张文朝陈月辉奚江惠牛栓保徐遐龄施秀萍王吉利邵德军潘艳
Owner NANJING NARI GROUP CORP
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