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Method and device for positioning voltage sag source

A technology of voltage sag source and positioning method, applied in directions such as fault location, can solve the problems of high installation cost, single measurement and positioning method, large amount of information, etc., and achieve the effect of cost saving

Active Publication Date: 2012-07-25
NORTH CHINA ELECTRICAL POWER RES INST +1
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Problems solved by technology

[0005] Among the existing three types of fault location methods, the first type method can have more accurate results, but the equipment cost is higher; the second type method has certain accuracy, but involves a large amount of information, such as historical data and operator experience ; The third category is a single measurement and location method, which is only suitable for identifying the faults of the transformer bus directly connected to the power supply line

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  • Method and device for positioning voltage sag source
  • Method and device for positioning voltage sag source
  • Method and device for positioning voltage sag source

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specific Embodiment

[0104] Take Zhangjiakou power grid as an example to verify that the fault location and fault measurement data of monitoring points of the present invention are known. According to the location method of the voltage sag source of the present invention, a fault point standard identification model is established, and the similarity is compared by a similarity formula, and the template with the largest similarity corresponds to the location of the fault point. N fault points correspond to N standard templates, forming a standard template matrix (formulas (4-4)~(4-7)). In order to illustrate the problem, three standard models of known fault points are selected for similarity comparison, so as to point out the location of the fault point.

[0105] Figure 8 It is a specific system wiring diagram of this embodiment, from which the distribution of fault points, monitoring points and other non-measurement points can be clearly seen.

[0106] In the embodiment of the present invention...

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Abstract

The embodiment of the invention discloses a method for positioning a voltage sag source, which comprises the following steps: according to a power network structure, a fault type, a triggering condition of an electric energy quality monitor and a preset constraint condition, calculating to generate a node position for installing the electric energy quality monitor; establishing a voltage sag source identification model; according to a three-phase voltage of a node at which the electric energy quality monitor is positioned, calculating an unbalanced value of the node, and according to the unbalanced value, judging a circuit fault type; according to the circuit fault type, the voltage sag source identification model corresponding to the circuit fault type and a voltage variable quantity measured by the electric energy quality monitor, calculating to generate the similarity; and comparing the similarity and positioning the voltage sag source. The embodiment of the invention also provides a device for positioning the voltage sag source. By the method and the device for positioning the voltage sag source, which are disclosed by the embodiment of the invention, a special fault recorder does not need to be used, so that the cost is saved; and moreover, complex data preparation does not need to be carried out, data can be captured only by an electric energy quality monitoring network and a further data mining technology is easy to use.

Description

technical field [0001] The invention relates to the field of grid fault location, in particular to a method and device for locating a voltage sag source, which also includes confirming the sag domain of the voltage sag source according to the voltage sag source. Background technique [0002] Basically, grid fault location methods can be divided into three categories: the first category is based on equipment fault location technology, traveling wave technology and fault location devices are based on equipment fault location methods. The traveling wave method requires sophisticated equipment, such as high-speed data acquisition equipment, sensors and global positioning systems to obtain transient traveling waves; the fault display is simpler than the traveling wave technology, it is installed at some positions on the feeder, and when a fault occurs, it lights up In the form of a visual signal to show the fault zone, but the visual signal needs to be transmitted to the control ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 蔡维贺惠民杨洪耕锁娟王建伟赵燕坤
Owner NORTH CHINA ELECTRICAL POWER RES INST
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